By resolving one equation for one variable and substituting it into the other equation, the substitution method is a method for solving systems of linear equations. The correct answer is option d.
We are given the following information:
f(x) = 2x-3 and
g(x) = 2.
To find f(g(x)), we need to substitute g(x) in place of x in f(x) because g(x) is the input to f(x). Thus we have;
f(g(x))=f(2
2(2)-3
1.
To find g(f(x)), we need to substitute f(x) in place of x in g(x) because f(x) is the input to g(x). Thus we have;
g(f(x))=g(2x-3)
=2(2x-3)
=4x-6. Therefore,
f(g(x))=1 and
g(f(x))=4x-6. Answer: Option D.
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Using the Applications of Definite Integral and Plane Areas and Areas Between Curves and Volumes of Solid of Revolution solve the following problem. Show your solution.
1. Find the area of the region bounded by y = x^2 + 2x -6 and y = 3x
2.. Determine the volume of the solid obtained by rotating the region bounded by y=x^2 and y=x about the x-axis
3. Determine the area of region by y = x^2 + 4x and the y-axis
4. Determine the area of region bounded by y = x^2 and y = 2x - x^2
5. Find the volume of the solid obtained by rotating the region bounded by y=x^2, y = 4 and the y-axis about the y-axis
6. Determine the volume of the solid obtained by rotating the region bounded by y= x - x^3, x = 0, x = 1 and the x - axis about the y-axis
1. The area of the region bounded by y = x^2 + 2x - 6 and y = 3x is 17 units squared.
To find the area, we need to determine the points of intersection between the two curves. Setting them equal to each other, we have x^2 + 2x - 6 = 3x. Rearranging the equation gives x^2 - x - 6 = 0, which factors into (x - 3)(x + 2) = 0. Thus, x = 3 or x = -2.
Integrating y = x^2 + 2x - 6 and y = 3x with respect to x between these x-values gives us the areas between the curves. Taking the definite integral of (x^2 + 2x - 6) - (3x) from -2 to 3 yields the area of the region, which is 17 units squared.
2. The volume of the solid obtained by rotating the region bounded by y = x^2 and y = x about the x-axis is (2/5)π cubic units.
Using the method of cylindrical shells, we can calculate the volume. The radius of each shell is x, and the height is the difference between the curves: (x^2 - x). Integrating 2πx(x^2 - x) with respect to x from 0 to 1 gives us the volume of the solid, which is (2/5)π cubic units.
3. The area of the region bounded by y = x^2 + 4x and the y-axis is 40/3 units squared.
To find the area, we integrate the curve y = x^2 + 4x with respect to x between the x-values where it intersects the y-axis. The equation x^2 + 4x = 0 factors into x(x + 4) = 0, so x = 0 or x = -4. Integrating (x^2 + 4x) with respect to x from -4 to 0 gives us the area of the region, which is 40/3 units squared.
4. The area of the region bounded by y = x^2 and y = 2x - x^2 is 8/3 units squared.
To find the area, we calculate the definite integral of (2x - x^2) - (x^2) with respect to x between the x-values where the curves intersect. Setting 2x - x^2 = x^2 gives us x = 2 or x = 0. Integrating (2x - x^2) - (x^2) with respect to x from 0 to 2 gives us the area of the region, which is 8/3 units squared.
5. The volume of the solid obtained by rotating the region bounded by y = x^2, y = 4, and the y-axis about the y-axis is (128/15)π cubic units.
Using the method of cylindrical shells, we integrate 2πx(4 - x^2) with respect to x from 0 to 2 to calculate the volume. The radius of each shell is x, and the height is the difference between the curves: (4 - x^2). The resulting volume is (128/15)π cubic units.
6. The volume of the solid obtained by rotating the region bounded by y = x - x^3, x = 0, x = 1, and the x-axis about the y-axis is (1/30)π cubic units.
To find the volume, we use the formula for the volume of a solid of revolution: V = π∫(f(x))^2 dx, where f(x) represents the curve and the integral is taken over the interval of interest.
In this case, the curve intersects the x-axis at x = 0. Therefore, the volume V is given by V = π∫(x - x^3)^2 dx from 0 to 1. Simplifying, we have V = π∫(x^2 - 2x^4 + x^6) dx from 0 to 1. Evaluating the integral, we find V = (1/30)π cubic units.
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find the points on the surface xy^2z^3 that are closest to the origin.
The points on the surface [tex]xy^2z^3[/tex] that are closest to the origin are: (0, 0, z) for any non-zero z, (x, 0, 0) for any x, and (x, y, 0) for any x and y.To find the points on the surface [tex]xy^2z^3[/tex] that are closest to the origin, we need to minimize the distance between the origin (0, 0, 0) and the points on the surface.
The distance between two points[tex](x1, y1, z1)[/tex] and [tex](x2, y2, z2)[/tex]can be calculated using the distance formula:
d = sqrt([tex](x2 - x1)^2 + (y2 - y1)^2 + (z2 - z1)^2)[/tex]
For the surface [tex]xy^2z^3[/tex], the coordinates (x, y, z) satisfy the equation [tex]xy^2z^3[/tex] = 0.
To minimize the distance, we need to find the points on the surface that minimize the distance from the origin.
Since [tex]xy^2z^3[/tex] = 0, we can consider two cases:
1. If [tex]xy^2z^3[/tex] = 0 and z ≠ 0, then x or y must be 0. This gives us two points: (0, 0, z) and (x, 0, 0).
2. If z = 0, then [tex]xy^2z^3[/tex] = 0 regardless of the values of x and y. This gives us one point: (x, y, 0).
Therefore, the points on the surface [tex]xy^2z^3[/tex] that are closest to the origin are:
(0, 0, z) for any non-zero z,
(x, 0, 0) for any x, and
(x, y, 0) for any x and y.
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Evaluate the integrals:
1.) ∫01 1 / (x2+1)2dx
2.) ∫ x+1 / √x2+2x+2 dx
3.) ∫ √4x2-1 / x dx
4.) ∫ 1 / x3 √x2-1
1.) ∫[0,1] 1 / (x^2+1)^2 dx:
To evaluate this integral, we can use a trigonometric substitution. Let's substitute x = tan(θ). Then dx = sec^2(θ) dθ, and we can rewrite the integral as:
∫[0,1] 1 / (tan^2(θ) + 1)^2 * sec^2(θ) dθ.
Now, let's substitute x = tan(θ) in the bounds as well:
When x = 0, θ = 0.
When x = 1, θ = π/4.
The integral becomes:
∫[0,π/4] 1 / (tan^2(θ) + 1)^2 * sec^2(θ) dθ.
Using the trigonometric identity sec^2(θ) = 1 + tan^2(θ), we can simplify the integral:
∫[0,π/4] 1 / (1 + tan^2(θ))^2 * sec^2(θ) dθ
= ∫[0,π/4] 1 / (sec^2(θ))^2 * sec^2(θ) dθ
= ∫[0,π/4] 1 / sec^4(θ) * sec^2(θ) dθ
= ∫[0,π/4] sec^(-2)(θ) dθ.
Now, using the integral identity ∫ sec^2(θ) dθ = tan(θ), we have:
∫[0,π/4] sec^(-2)(θ) dθ = tan(θ) |[0,π/4]
= tan(π/4) - tan(0)
= 1 - 0
= 1.
Therefore, ∫[0,1] 1 / (x^2+1)^2 dx = 1.
2.) ∫ x+1 / √(x^2+2x+2) dx:
To evaluate this integral, we can use a substitution. Let's substitute u = x^2 + 2x + 2. Then du = (2x + 2) dx, and we can rewrite the integral as:
(1/2) ∫ (x+1) / √u du.
Now, let's find the limits of integration using the substitution:
When x = 0, u = 2.
When x = 1, u = 4.
The integral becomes:
(1/2) ∫[2,4] (x+1) / √u du.
Expanding the numerator, we have:
(1/2) ∫[2,4] x/√u + 1/√u du
= (1/2) ∫[2,4] x/u^(1/2) + 1/u^(1/2) du
= (1/2) ∫[2,4] xu^(-1/2) + u^(-1/2) du.
Using the power rule for integration, the integral becomes:
(1/2) [2x√u + 2u^(1/2)] |[2,4]= x√u + u^(1/2) |[2,4]
= (x√4 + 4^(1/2)) - (x√2 + 2^(1/2))
= 2x + 2√2 - (x√2 + √2)
= x + √2.
Therefore, ∫ x+1 / √(x^2+2x+2) dx = x + √2 + C, where C is the constant of integration.
3.) ∫ √(4x^2-1) / x dx:
To evaluate this integral, we can simplify the integrand by dividing both numerator and denominator by x:
∫ √(4x^2-1) / x dx= ∫ (4x^2-1)^(1/2) / x dx.
Now, let's split this integral into two parts:
∫ (4x^2)^(1/2) / x dx - ∫ (1)^(1/2) / x dx
= 2∫ x / x dx - ∫ 1 / x dx
= 2∫ dx - ∫ 1 / x dx
= 2x - ln|x| + C,
where C is the constant of integration.
Therefore, ∫ √(4x^2-1) / x dx = 2x - ln|x| + C.
4.) ∫ 1 / (x^3 √(x^2-1)) dx:
To evaluate this integral, we can use a trigonometric substitution. Let's substitute x = sec(θ). Then dx = sec(θ)tan(θ) dθ, and we can rewrite the integral as:
∫ 1 / (sec^3(θ) √(sec^2(θ)-1)) sec(θ)tan(θ) dθ
= ∫ tan(θ) / (sec^2(θ)tan(θ)) dθ
= ∫ 1 / sec^2(θ) dθ
= ∫ cos^2(θ) dθ.
Using the double-angle formula for cosine, cos^2(θ) = (1 + cos(2θ))/2, we have:
∫ (1 + cos(2θ))/2 dθ
= (1/2) ∫ 1 dθ + (1/2) ∫ cos(2θ) dθ
= (1/2)θ + (1/4)sin(2θ) + C,
where C is the constant of integration.
Substituting back x = sec(θ), we have:
∫ 1 / (x^3 √(x^2-1)) dx = (1/2)arcsec(x) + (1/4)sin(2arcsec(x)) + C,
where C is the constant of integration.
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dx dt = x (5 — x − 6y) dy = y(1 – 5x) . dt (a) Write an equation for a vertical-tangent nullcline that is not a coordinate axis: y=(5-x)/6 (Enter your equation, e.g., y=x.) And for a horizontal-tangent nullcline that is not a coordinate axis: x=1/5 (Enter your equation, e.g., y=x.) (Note that there are also nullclines lying along the axes.) (b) What are the equilibrium points for the system? Equilibria = (Enter the points as comma-separated (x,y) pairs, e.g., (1,2), (3,4).) (c) Use your nullclines to estimate trajectories in the phase plane, completing the following sentence: If we start at the initial position (,), trajectories converge to the point (0,0) (Enter the point as an (x,y) pair, e.g., (1,2).)
The system of equations has two nullclines, one vertical and one horizontal. The equilibrium points are (0,0) and (1/5, 5/6). Trajectories starting in the upper right quadrant converge to (0,0), while trajectories starting in the lower left quadrant converge to (1/5, 5/6).
The vertical nullcline is given by the equation y = (5 - x)/6. This is the line where dx/dt = 0. The horizontal nullcline is given by the equation x = 1/5. This is the line where dy/dt = 0.
The equilibrium points are the points where dx/dt = 0 and dy/dt = 0. There are two equilibrium points, (0,0) and (1/5, 5/6).
To find the direction of motion, we can look at the signs of dx/dt and dy/dt. If dx/dt > 0 and dy/dt > 0, then the trajectory is moving up and to the right. If dx/dt < 0 and dy/dt < 0, then the trajectory is moving down and to the left.
If we start at the initial position (x,y) in the upper right quadrant, then dx/dt > 0 and dy/dt > 0. This means that the trajectory will move up and to the right. As the trajectory moves, dx/dt will decrease and dy/dt will increase. Eventually, the trajectory will reach the vertical nullcline. At this point, dx/dt = 0 and the trajectory will start moving horizontally. The trajectory will continue moving horizontally until it reaches the horizontal nullcline. At this point, dy/dt = 0 and the trajectory will stop moving.
If we start at the initial position (x,y) in the lower left quadrant, then dx/dt < 0 and dy/dt < 0. This means that the trajectory will move down and to the left. As the trajectory moves, dx/dt will increase and dy/dt will decrease. Eventually, the trajectory will reach the horizontal nullcline. At this point, dy/dt = 0 and the trajectory will start moving vertically. The trajectory will continue moving vertically until it reaches the vertical nullcline. At this point, dx/dt = 0 and the trajectory will stop moving.
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.Suppose that the monthly cost, in dollars, of producing x chairs is C(x) = 0.006x³ +0.07x² +19x+600, and currently 80 chairs are produced monthly. a) What is the current monthly cost? b)What is the marginal cost when x=80? c)Use the result from part (b) to estimate the monthly cost of increasing production to 82 chairs per month. d)What would be the actual additional monthly cost of increasing production to 82 chairs monthly?
a) The current monthly cost of producing 80 chairs is $2,512.
b) The marginal cost when x=80 is $207.
c) The estimated monthly cost of increasing production to 82 chairs is $2,926.
d) The actual additional monthly cost of increasing production to 82 chairs is $414.
What is the monthly cost of producing 80 chairs per month?The current monthly cost of producing 80 chairs can be found by substituting x=80 into the cost function C(x) = 0.006x³ + 0.07x² + 19x + 600. Evaluating this expression gives us C(80) = 0.006(80)³ + 0.07(80)² + 19(80) + 600 = $2,512.
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The marginal cost represents the additional cost incurred when producing one additional unit. It is the derivative of the cost function with respect to x. Taking the derivative of C(x) = 0.006x³ + 0.07x² + 19x + 600, we get C'(x) = 0.018x² + 0.14x + 19. Substituting x=80 into the derivative gives C'(80) = 0.018(80)² + 0.14(80) + 19 = $207.
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To estimate the monthly cost of increasing production to 82 chairs, we can use the marginal cost at x=80. Since the marginal cost represents the additional cost of producing one additional chair, we can add the marginal cost to the current cost. Therefore, the estimated monthly cost would be $2,512 (current cost) + $207 (marginal cost) = $2,926.
Learn more about the estimated monthly cost of increasing production to 82 chairs per month.
The actual additional monthly cost of increasing production to 82 chairs can be found by subtracting the cost of producing 80 chairs from the cost of producing 82 chairs. Evaluating C(82) - C(80), we get [0.006(82)³ + 0.07(82)² + 19(82) + 600] - [0.006(80)³ + 0.07(80)² + 19(80) + 600] = $2,926 - $2,512 = $414.
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Calculate vxw = (V₁, V2, V3). v = (7,3,4) w = (-4,6,-3) (Give your answer using component form or standard basis vectors. Express numbers in exact form. Use symbolic notation and fractions where needed.) VxW=
Answer:The cross product V × W can be calculated as follows:
V × W = (V2W3 - V3W2, V3W1 - V1W3, V1W2 - V2W1)
= (3*(-3) - 46, 4(-4) - 7*(-3), 76 - 3(-4))
= (-29, -13, 54)
Step-by-step explanation:
To calculate the cross product V × W, we can use the formula:
V × W = (V2W3 - V3W2, V3W1 - V1W3, V1W2 - V2W1)
Given that V = (V₁, V₂, V₃) = (7, 3, 4) and W = (-4, 6, -3), we can substitute these values into the formula to find the cross product.
Plugging in the values, we get:
V × W = (3*(-3) - 46, 4(-4) - 7*(-3), 76 - 3(-4))
= (-9 - 24, -16 + 21, 42 + 12)
= (-33, -13, 54)
Hence, V × W =B
In the context of vector algebra, the cross product V × W yields a vector that is orthogonal (perpendicular) to both V and W. The magnitude of the cross product represents the area of the parallelogram formed by V and W, and its direction follows the right-hand rule. In this case, the resulting cross product is (-33, -13, 54).
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Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration)
∫2dt / (t²-4)²
.......
The integral of 2dt / (t² - 4)² is equal to -1/(t² - 4) + C, where C represents the constant of integration.
To evaluate the integral, we start by substituting u = t² - 4, which simplifies the expression. This substitution allows us to rewrite the integral as ∫(1/u²) du.
By integrating 1/u² with respect to u, we obtain -u^(-1) + C as the antiderivative. Substituting back u = t² - 4, we arrive at the final result of -1/(t² - 4) + C.
The constant of integration, represented by C, is added because indefinite integrals have an infinite number of solutions, differing only by a constant term. Thus, the evaluated integral is -1/(t² - 4) + C.
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Find the maximum and minimum values of the function y = 2 cos(0) + 7 sin(0) on the interval [0, 27] by comparing values at the critical points and endpoints.
The maximum value of the function y = 2 cos(0) + 7 sin(0) on the interval [0, 27] is 7 and the minimum value is -2.
Here, the given function is y = 2 cos(0) + 7 sin(0). Now, we have to find the maximum and minimum values of the given function on the interval [0, 27] by comparing values at the critical points and endpoints. The given function is the sum of two functions: f(x) = 2cos(0) and g(x) = 7sin(0).Let's first consider the function f(x) = 2cos(0): The range of the function f(x) is [-2, 2].Let's now consider the function g(x) = 7sin(0): The range of the function g(x) is [-7, 7].Hence, the maximum value of y = f(x) + g(x) on the given interval is 7 and the minimum value is -2.
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Solve the following equations using the Laplace transform method, where x(0) = 0, y(0) = 0 y z(0) = 0: dx =y-2z-t dt dy = x + 2 + 2t dt =x-y-2 dz dt
To solve the given system of differential equations using the Laplace transform method, we apply the Laplace transform to each equation and solve for the transformed variables. The solutions is x(t), y(t), and z(t) in the time domain.
For the given system:
dx/dt = y - 2z - t,
dy/dt = x + 2 + 2t,
dz/dt = x - y - 2.
Applying the Laplace transform to each equation, we obtain:
sX(s) - x(0) = Y(s) - 2Z(s) - 1/s^2,
sY(s) - y(0) = X(s) + 2/s + 2/s^2,
sZ(s) - z(0) = X(s) - Y(s) - 2/s.
Since x(0) = y(0) = z(0) = 0, we can simplify the equations:
sX(s) = Y(s) - 2Z(s) - 1/s^2,
sY(s) = X(s) + 2/s + 2/s^2,
sZ(s) = X(s) - Y(s) - 2/s.
We can now solve these equations to find X(s), Y(s), and Z(s) in terms of the Laplace variables. After finding the inverse Laplace transform of each variable, we obtain the solutions x(t), y(t), and z(t) in the time domain.
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Points G and H lie on the same line. The coordinate of G is - 3x +
5 and the coordinates of H is 5x + 4 If GH = 39 , find the
coordinate (s) of G.
The coordinate of point G on the line is found by substituting the given distance GH and the coordinates of point H into the equation of the line and solving for x.
Let's set up an equation to represent the distance between points G and H on the same line. The distance formula is given by d = √[(x₂ - x₁)² + (y₂ - y₁)²]. In this case, we have the coordinates of G as (-3x + 5) and the coordinates of H as (5x + 4), and the distance GH is given as 39.
Using the distance formula, we can set up the equation:
√[(5x + 4) - (-3x + 5)]² = 39
Simplifying the equation, we have:
√[8x + 1]² = 39
Squaring both sides of the equation, we get:
8x + 1 = 39²
Solving for x, we have:
8x = 39² - 1
x = (39² - 1) / 8
Evaluating the expression, we find x ≈ 75.75.
Substituting this value back into the coordinates of G (-3x + 5), we get:
G = (-3(75.75) + 5, 5)
G ≈ (13, 5)
Therefore, the coordinates of point G are approximately (13, 5).
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Calculate the flux of the vector field F(x, y, z) = 57 – 23 + 8k through a square of side length 3 lying in the plane 3x + 3y + 3z = 1, oriented away from the origin. Flux =
The flux of the vector field F(x, y, z) = 57i – 23j + 8k through the square lying in the plane 3x + 3y + 3z = 1, oriented away from the origin, is zero.
To calculate the flux of the vector field F through the given square, we need to evaluate the surface integral of the dot product of F and the outward unit normal vector of the square over the surface of the square.
The outward unit normal vector of the square is given by the normalized gradient vector of the plane equation 3x + 3y + 3z = 1, which is (3i + 3j + 3k)/√(3² + 3² + 3²) = (1/√3)(i + j + k).
Since the side length of the square is 3, the area of the square is (3)^2 = 9.
The flux is then given by the surface integral:
Flux = ∬S F · dS
where dS represents the differential surface area element of the square.
Substituting the values, we have:
Flux = ∬S (57i – 23j + 8k) · ((1/√3)(i + j + k)) dS
Since the square is lying in the plane, the dot product of F and the unit normal vector (i + j + k) will always be zero. Therefore, the flux through the square is zero.
The flux of the vector field F through the square is zero, indicating that there is no net flow of the vector field through the square in the outward direction.
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Approximate the value of e by looking at the initial value problem y' = y with
y(0) = 1 and approximating y(1) using Euler’s method with a step size of 0.2.
(use a calculator and make your answer accurate out to four decimal places)
Exact equations: For each of the following if the differential equation is exact, solve it. If it is not exact show why not.
A) (y+6x)+(ln(x)2)y’ = 0, where x > 0.
B) y’ = (2x+3y)/(3x+4y).
To approximate the value of e using Euler's method with a step size of 0.2 for the initial value problem y' = y, y(0) = 1.
Set the initial condition: y0 = 1.
Define the step size: h = 0.2.
Iterate using Euler's method to find y(1):
x1 = x0 + h = 0 + 0.2 = 0.2
y1 = y0 + h * f(x0, y0) = 1 + 0.2 * 1 = 1.2
Repeat the iteration process four more times:
x2 = 0.2 + 0.2 = 0.4, y2 = 1.2 + 0.2 * 1.2 = 1.44
x3 = 0.4 + 0.2 = 0.6, y3 = 1.44 + 0.2 * 1.44 = 1.728
x4 = 0.6 + 0.2 = 0.8, y4 = 1.728 + 0.2 * 1.728 = 2.0736
x5 = 0.8 + 0.2 = 1.0, y5 = 2.0736 + 0.2 * 2.0736 = 2.48832
Therefore, approximating y(1) using Euler's method with a step size of 0.2 gives y(1) ≈ 2.4883. Since the initial value problem is y' = y, y(0) = 1, we can observe that the value of y(1) approximates the value of e (Euler's number). Thus, the approximate value of e is 2.4883 (accurate to four decimal places).
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1A.) Determine whether the three points are the vertices of a right triangle.
(-2, 3), (0, 7), (2, 6)
1B.) Determine whether the three points are the vertices of a right triangle.
(5, 8), (11, 10), (15, -2)
1C.) Determine whether the three points are the vertices of a right triangle.
(-1, -1), (5, 1), (4, -4)
1D.) Determine whether the three points are collinear.
(-2, 6), (-4, -3), (0, 15)
1E.) Determine whether the three points are collinear.
(13, -10), (5, -4), (7, -2)
1F.) Determine whether the three points are collinear.
(-5, -11), (4, 7), (9, 17)
1G.) Determine whether the three points are collinear.
(8, -4), (-5, 8), (1, 1)
The vertices (-2, 3), (0, 7), (2, 6) make a right triangle.
How to determine if the 3 points are vertices of a right triangle?Let's solve this for the first set:
(-2, 3), (0, 7), (2, 6)
Remember that for any right triangle, the sum of the squares of the two shorter sides must be equal to the square of the longer side.
Now, let's find the length of each side.
The distance between the vertices will give us the length of each side, between (-2, 3) and (0, 7) the distance is:
d1 = √( (-2 - 0)² + (3 - 7)²) = √20
Between (0, 7) and (2, 6) the distance is:
d2 = √( (2 - 0)² + (6 - 7)²) = √5
Betweekn (2, 6) and (-2, 3) the distance is:
d3 = √( (-2 - 2)² + (3 - 6)²) = √25 = 5
Then the sidelengths are:
d1 = √20
d2 = √5
d3 = 5
Adding the squares of the shorter ones we get:
√20² + √5² = 20 + 5 = 25
Which is equal to the square of the longer one 5² = 25
So yea, these vertices make a right triangle.
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Find the distance between the skew lines =(4,-2,−1) +t(1,4,-3) and F = (7,-18,2)+u(-3,2,-5).
We are given the equations of two skew lines in 3D space and asked to find the distance between them.
Let's denote the first line as L1 and the second line as L2. We can find the distance between two skew lines by finding the shortest distance between any two points on the lines.
For L1, we have a point A(4, -2, -1) and a direction vector d1(1, 4, -3).
For L2, we have a point B(7, -18, 2) and a direction vector d2(-3, 2, -5).
To find the shortest distance, we can take a vector AB connecting a point on L1 to a point on L2, and then calculate the projection of AB onto the vector orthogonal to both direction vectors (d1 and d2). Finally, we divide this projection by the magnitude of the orthogonal vector to obtain the distance.
The vector AB is given by AB = B - A = (7, -18, 2) - (4, -2, -1) = (3, -16, 3).
The orthogonal vector to d1 and d2 is given by n = d1 x d2, where "x" denotes the cross product. Evaluating the cross product, we have n = (2, 2, 10).
Now, we can find the distance using the formula:
Distance = |AB · n| / |n|,
where · denotes the dot product and | | represents the magnitude.
Calculating the dot product, we have AB · n = (3, -16, 3) · (2, 2, 10) = 44.
The magnitude of the orthogonal vector is |n| = √(2^2 + 2^2 + 10^2) = √108 = 6√3.
Thus, the distance between the skew lines is Distance = |AB · n| / |n| = 44 / (6√3) = (22√3) / 3.
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Assume that the algorithm receives the same input values as in part a). At several places in the code, the algorithm requires a comparison of the size of two integers. Compute the total number of such comparisons that the algorithm must perform. Show work that explains your answer.
The number of comparisons that the algorithm must perform is 10.
To get the solution, we need to analyze the given algorithm.
Consider the following algorithm to sort three integers x, y, and z in non-decreasing order using only two comparisons: if x > y, then swap (x, y);
if y > z, then swap (y, z);
if x > y, then swap (x, y);
For a given set of values of x, y, and z, the algorithm makes a maximum of two swaps.
Hence, for 10 given input values, the algorithm would perform a maximum of 20 swaps.
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You measure the lifetime of a random sample of 25 rats that are exposed to 10 Sv of radiation (the equivalent of 1000 REM), for which the LD100 is 14 days. The sample mean is = 13.8 days. Suppose that the lifetimes for this level of exposure follow a Normal distribution, with unknown mean and standard deviation = 0.75 days. Suppose you had measured the lifetimes of a random sample of 100 rats rather than 25. Which of the following statements is TRUE? The margin of error for the 95% confidence interval would decrease. The margin of error for the 95% confidence interval would increase. The standard deviation would decrease. Activate Windows The margin of error for the 95% confidence interval would stay the same since Go to Settings to activate Window the level of confidence has not changed.
The margin of error for the 95% confidence interval would decrease.
The margin of error for a confidence interval is affected by the sample size. As the sample size increases, the margin of error decreases, resulting in a narrower interval. In this case, when the sample size increases from 25 to 100, the margin of error for the 95% confidence interval would decrease. This is because a larger sample size provides more information about the population, leading to a more precise estimate of the mean. The standard deviation is not directly related to the change in the margin of error, so it may or may not change in this scenario.
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1. The demand function for a product is modeled by p(x) = 84e −0.00002x where p is the price per unit in dollars and x is the number of units. What price will yield maximum revenue? (Hint: Revenue= (price) x (no. of units))
Setting each factor equal to zero, we have 84e^(-0.00002x) = 0 (which has no solution since e^(-0.00002x) is always positive)
The price that will yield maximum revenue can be found by maximizing the revenue function, which is the product of the price per unit and the number of units sold.
In this case, the demand function is given by p(x) = 84e^(-0.00002x), where p represents the price per unit and x represents the number of units. To find the price that yields maximum revenue, we need to determine the value of x that maximizes the revenue function.
The revenue function can be expressed as R(x) = p(x) * x, where R represents the revenue and x represents the number of units sold. Substituting the given demand function into the revenue function, we have R(x) = (84e^(-0.00002x)) * x.
To find the maximum value of the revenue function, we can take the derivative of R(x) with respect to x and set it equal to zero. This will give us the critical points where the slope of the revenue function is zero, indicating a possible maximum.
Taking the derivative of R(x) and setting it equal to zero, we have: dR/dx = (84e^(-0.00002x)) - (0.00002x)(84e^(-0.00002x)) = 0.
Simplifying the equation, we can factor out 84e^(-0.00002x) and solve for x: 84e^(-0.00002x)[1 - 0.00002x] = 0.
Setting each factor equal to zero, we have: 84e^(-0.00002x) = 0 (which has no solution since e^(-0.00002x) is always positive)
1 - 0.00002x = 0.
Solving for x, we find x = 1/0.00002 = 50000.
Therefore, the price that will yield maximum revenue is given by plugging this value of x into the demand function p(x):
p(50000) = 84e^(-0.00002 * 50000) ≈ 84e^(-1).
The exact value of the price can be obtained by evaluating this expression using a calculator or software.
In summary, to find the price that yields maximum revenue, we maximize the revenue function R(x) = p(x) * x by taking its derivative, setting it equal to zero, and solving for x.
The resulting value of x is then plugged into the demand function p(x) to obtain the price that yields maximum revenue.
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Identify the initial conditions y(0) and y'(0). An object is released from a height of 70 meters with an upward velocity of 4 m/s.
y(0)____ y'(0)____
y(0) = 70 meters, y'(0) = -4 m/s. The initial conditions for the object released from a height of 70 meters with an upward velocity of 4 m/s are as follows:
y(0) refers to the initial position or height of the object at time t = 0. In this case, the object is released from a height of 70 meters, so y(0) is equal to 70 meters.
y'(0) refers to the initial velocity or the rate of change of position with respect to time at t = 0. The given information states that the object has an upward velocity of 4 m/s.
Since velocity is the rate of change of position, a positive velocity indicates upward movement, and a negative velocity indicates downward movement.
In this case, the upward velocity is given as 4 m/s, so y'(0) is equal to -4 m/s, indicating that the object is moving in the downward direction.
These initial conditions provide the starting point for analyzing the motion of the object using mathematical models or equations of motion. They allow us to determine the object's position, velocity, and acceleration at any given time during its motion.
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Better Build Construction company is interested in safety regulation adherence in their backhoe operators and they collect data on 10 backhoe operators from each of 10 of their locations. The population is: Better Build Construction company is interested in safety regulation adherence in their backhoe operators and they collect data on 10 backhoe operators from each of 10 of their locations. The population is: all backhoe operators 10 backhoe operators from each location 100 backhoe operators from which data was collected all backhoe operators at Better Build Construction company
The population in this scenario refers to the group of interest for which data is collected.
The interpretation of the population depends on the specific focus and scope of the study. If the study aims to generalize the findings to all backhoe operators, then the population would be all backhoe operators. However, if the study focuses on specific locations within the company, then the population could be 10 backhoe operators from each location. Alternatively, if the study collected data from 100 backhoe operators, irrespective of their locations, then the population could be the 100 operators from which data was collected. Lastly, if the study is specifically concerned with backhoe operators within Better Build Construction company, then the population would be all backhoe operators at the company.
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The demand function for a firm’s product is given by P = 60 − Q. Fixed costs are 100, and the variable costs per good are Q + 6.
(a) Write down an expression for total revenue, TR, in terms of Q
(b) Write down an expression for total costs, TC, in terms of Q and deduce that the average cost function is given by
AC = Q + 6 + 100/Q
(c) Show that the profit function is given by π = 2(2 − Q)(Q − 25)
State the values of Q for which the firm breaks even and determine the maximum profit.
(a) TR = P * Q = (60 - Q) * Q = 60Q - Q²
(b) TC = 100 + (Q + 6) * Q = 100 + Q² + 6Q = Q² + 6Q + 100. To deduce the average cost function (AC), we divide TC by Q:
AC = TC / Q = (Q² + 6Q + 100) / Q = Q + 6 + 100 / Q.
(c) the firm breaks even when Q = 2 or Q = 25, and the maximum profit occurs at Q = 13
a) The expression for total revenue, TR, can be obtained by multiplying the price per unit (P) by the quantity (Q). Since the demand function is given as P = 60 - Q, we substitute this into the expression for TR:
TR = P * Q = (60 - Q) * Q = 60Q - Q².
b) The expression for total costs, TC, is the sum of fixed costs and variable costs. Fixed costs are given as $100, and the variable costs per unit are Q + 6. Therefore, TC can be expressed as:
TC = 100 + (Q + 6) * Q = 100 + Q² + 6Q = Q² + 6Q + 100.
To deduce the average cost function (AC), we divide TC by Q:
AC = TC / Q = (Q² + 6Q + 100) / Q = Q + 6 + 100 / Q.
c) The profit function (π) is calculated by subtracting total costs (TC) from total revenue (TR):
π = TR - TC = (60Q - Q²) - (Q² + 6Q + 100) = 60Q - 2Q² - 6Q - 100.
Simplifying, we get π = -2Q² + 54Q - 100.
To find the values of Q for which the firm breaks even, we set the profit function equal to zero and solve for Q:
-2Q² + 54Q - 100 = 0.
Using the quadratic formula, we find two possible values for Q: Q = 2 and Q = 25.
To determine the maximum profit, we can find the vertex of the profit function. The vertex occurs at Q = -b / (2a), where a and b are the coefficients of the quadratic equation. In this case, a = -2 and b = 54. Plugging in these values, we find Q = 13.
Therefore, the firm breaks even when Q = 2 or Q = 25, and the maximum profit occurs at Q = 13.
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6. An input of 251³ u(t) is applied to the input of a Type 3 unity feedback system, as shown in Figure P7.1,
where
G(s) = 210(s + 4)(s+6)(s + 11)(s +13)/s³ (s+7)(s+14)(s +19)
Find the steady-state error in position.
In a Type 3 unity feedback system with the transfer function G(s), where G(s) = 210(s + 4)(s+6)(s + 11)(s +13)/s³ (s+7)(s+14)(s +19), the steady-state error in position can be determined by evaluating the system's transfer function at s = 0.
The steady-state error in position can be found by evaluating the transfer function of the system at s = 0. In this case, the transfer function of the system is G(s) = 210(s + 4)(s+6)(s + 11)(s +13)/s³ (s+7)(s+14)(s +19).
To find the steady-state error, we substitute s = 0 into the transfer function. When s = 0, the denominator of the transfer function becomes non-zero, and the numerator evaluates to 210(4)(6)(11)(13) = 2,090,640.
The steady-state error in position (ess) is given by the formula ess = 1 / (1 + Kp), where Kp represents the position error constant.
Since the system is a Type 3 system, the position error constant is non-zero. Therefore, we can compute the steady-state error as ess = 1 / (1 + Kp).
In this case, the Kp value can be determined by evaluating the transfer function at s = 0. Substituting s = 0 into the transfer function, we get G(0) = 2,090,640.
Therefore, the steady-state error in position (ess) is ess = 1 / (1 + 2,090,640) = 1 / 2,090,641.
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I'm ready to appreciate. Please describe every detail please
Show that Let measure of ACR be 0. Then measure of the set {x²: EA} be 0 Every detail as possible and would appreciate
This can be proven by properties of measure theory and applying them .By establishing the relationship between the measures of ACR and {x²: x∈A}, it becomes clear that if ACR has a measure of 0, then the measure of {x²: x∈A} is also 0.
In measure theory, the measure of a set represents its "size" or "extent" in some sense. It provides a way to quantify the notion of size for various types of sets. In this case, we are interested in the measure of two sets: ACR and {x²: x∈A}.Given that the measure of set ACR is 0, we aim to demonstrate that the measure of the set {x²: x∈A} is also 0. Intuitively, this means that the set of squared values obtained by taking each element x from set A, denoted as x², has a measure of 0 as well.
One key property is that if two sets have a containment relationship (i.e., one set is a subset of the other), then the measure of the subset cannot exceed the measure of the superset. In other words, if ACR has a measure of 0, then any subset of ACR, including {x²: x∈A}, must also have a measure of 0 or less. Since {x²: x∈A} is a subset of ACR, it follows that its measure must be 0 or less.
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The total cost of producing a type of truck is given by C'(x): = 23000-90x+0.1.x², where x is the number of trucks produced. How many trucks should be produced to incur minimum cost? AnswerHow to enter your answer fopens in new window) 2 Points ..........trucks
The number of trucks needed to incur minimum cost is 230, obtained by solving the derivative of the cost function.
To find the minimum cost, we differentiate the cost function with respect to the number of trucks, resulting in C'(x) = 23000 - 90x + 0.1x². By setting the derivative equal to zero and solving the resulting quadratic equation, we find two solutions: x = 900 and x = 230.
However, since negative truck quantities are not meaningful in this context, we discard the x = 900 solution.
Therefore, the minimum cost is incurred when 230 trucks are produced. Producing any fewer or greater number of trucks will result in higher costs, making 230 the optimal quantity for minimizing production expenses.
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Evaluate the definite integral
a) Find an anti-derivative
b) Evaluate • f,ª (2ª − 7)*¹112³dx = If needed, round part b to 4 decimal places. ₁*₁ (x² − 7) * 112³ da - = f(x² − 7) * 11x³dx =
We are asked to evaluate the definite integral ∫[a to b] f(x)dx, where f(x) = (2x - 7) (112³). To do this, we first need to find an antiderivative of f(x) and then substitute the upper and lower limits into the antiderivative.
Additionally, we are asked to evaluate the definite integral ∫[1 to x] (x² - 7) ( 112³) dx, and again we need to find an antiderivative and substitute the limits to evaluate the integral.
a) To find an antiderivative of f(x) = (2x - 7) * 112³, we can use the power rule for integration. The antiderivative of 2x is x², and the antiderivative of -7 is -7x. Thus, the antiderivative of f(x) is F(x) = (x² - 7x) * 112³.
b) To evaluate the definite integral ∫[a to b] f(x)dx, we substitute the upper and lower limits into the antiderivative. The definite integral becomes F(b) - F(a), where F(x) is the antiderivative we found in part a.
c) Similarly, to evaluate the definite integral ∫[1 to x] (x² - 7) * 112³ dx, we find the antiderivative of (x² - 7) * 112³, which is F(x) = [(x³/3) - 7x] * 112³. Then, we substitute the upper and lower limits into the antiderivative, resulting in F(x) - F(1).
By evaluating the expressions F(b) - F(a) and F(x) - F(1), we can determine the values of the definite integrals.
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Among the 50 members of the Crafters' Guild, there are 30 who knit and 27 who crochet. If 15 of the knitters also crochet, how many of the Guild members do not knit and also do not crochet?
O A. 12
O B. 20
O C. 8
O D. 15
O E. 35
8 guild members neither knit nor crochet. Thus ,Option C is the correct answer.
Total number of members of the Crafters Guild n(U) = 50
Number of members who knit n(A) = 30
Probability of finding those who knit P(A) =[tex]\frac{n(A)}{n(U)}[/tex] = [tex]\frac{30}{50}[/tex]
Number of members who crochet n(B) = 27
Probability of finding those who crochet P(B) = [tex]\frac{n(B)}{n(U)}[/tex] = [tex]\frac{27}{30}[/tex]
Number of members who knit as well as crochet n(A∩B) = 15
Probability of finding members who also knit as well as crochet,
P(A∩B) = n(A∩B)/n(U) = [tex]\frac{15}{30}[/tex]
Probability of finding the number of guild members who did not knot and also do not crochet ,
= 1 - [P(A)+P(B)-P(A∩B)]
= 1 - [ [tex]\frac{30}{50}[/tex] +[tex]\frac{27}{50}[/tex] - [tex]\frac{15}{50}[/tex]]
= 1 - [tex]\frac{42}{50}[/tex]
= [tex]\frac{50 - 42}{50}[/tex]
= [tex]\frac{8}{50}[/tex]
Thus , the probability of finding the number of guild members who do not knit and also do not crochet is [tex]\frac{8}{50}[/tex] .
Therefore , the number of guild members who do not knit also do not crochet is 8 .
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8 members of the Guild do not knit and also do not crochet. Thus, option C is the correct answer.
Let us assume that,
u ⇒ members in the Guild,
∴n(u) = 50........(i)
k⇒ Guild members who knit,
∴n(k) = 30........(ii)
c⇒ Guild members who crochet,
∴n(c) = 27.........(iii)
So,
The number of Guild members who are knitters and can also crochet,
n(k∩c) = 15...........(iv)
Thus, the number of Guild members who do not knit and also do not crochet is represented by, n(k'∩c')
This gives us the equation:
n(k∪c)' = n(u) - [n(k) + n(c) - n(k∩c)] .........(v),
since, (k∪c)' = (k'∩c')
we have,
n(k'∩c') = n(u) - n(k) - n(c)+ n(k∩c)
= 50 - 30-27 + 15
n(k'∩c') =8
Therefore, 8 members of the Guild do not knit and also do not crochet. Thus, option C is the correct answer.
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You should be able to answer this question after studying Unit 6 . An object moves along a straight line. Its displacement s (in metres) from a reference point at time t (in seconds) is given by s=5t^4−2t^3−t^2+8 (t≥0). Answer the following questions using calculus and algebra. You may find it helpful to sketch or plot graphs, but no marks will be awarded for graphical arguments or solutions.
(a) Find expressions for the velocity v and the acceleration a of the object at time t.
(b) Find the velocity and corresponding acceleration after 4 seconds.
(c) Find any time(s) at which the velocity of the object is zero.
To answer the given questions, we need to find the expressions for velocity and acceleration, evaluate them at t = 4 seconds, and determine the time(s) at which the velocity is zero for the given displacement function s(t).
(a) The velocity v(t) is obtained by taking the derivative of the displacement function s(t) with respect to t:
v(t) = d/dt(5t^4 - 2t^3 - t^2 + 8)
= 20t^3 - 6t^2 - 2t
The acceleration a(t) is obtained by taking the derivative of the velocity function v(t) with respect to t:
a(t) = d/dt(20t^3 - 6t^2 - 2t)
= 60t^2 - 12t - 2
(b) To find the velocity and acceleration after 4 seconds, we substitute t = 4 into the expressions for v(t) and a(t):
v(4) = 20(4)^3 - 6(4)^2 - 2(4)
= 320
a(4) = 60(4)^2 - 12(4) - 2
= 904
Therefore, the velocity after 4 seconds is 320 m/s and the acceleration after 4 seconds is 904 m/s^2.
(c) To find the time(s) at which the velocity is zero, we set v(t) equal to zero and solve for t:
20t^3 - 6t^2 - 2t = 0
By factoring out t, we get:
t(20t^2 - 6t - 2) = 0
Setting each factor equal to zero, we have:
t = 0 (corresponding to the initial time) and
20t^2 - 6t - 2 = 0
Using the quadratic formula, we find two values for t:
t ≈ -0.1137 and t ≈ 0.3137
Therefore, the velocity of the object is zero at approximately t = -0.1137 seconds and t = 0.3137 seconds.
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7. [-/2 Points] DETAILS MY NOTES ASK YOUR TEACHER A farmer wants to fence an area of 60,000 m² in a rectangular field and then divide it in half with a fence parallel to one of the sides of the recta
Given that the farmer wants to fence an area of 60,000 m² in a rectangular field and then divide it in half with a fence parallel to one of the sides of the rectangle,
We can solve for the dimensions of the rectangular field.
Let's assume the length of the rectangular field is L and the width is W.
The area of a rectangle is given by the formula: A = L * W.
From the given information, we know that the area is 60,000 m², so we have: L * W = 60,000.
Additionally, we know that the field will be divided in half by a fence parallel to one of the sides. This means one of the dimensions, either length or width, will be divided by 2.
Let's assume the width, W, is divided by 2, so the new width becomes W/2. The length, L, remains unchanged.
With this information, we have a new equation: L * (W/2) = 60,000/2.
Simplifying, we get: L * (W/2) = 30,000.
Now, we have two equations:
L * W = 60,000.
L * (W/2) = 30,000.
We can solve this system of equations to find the values of L and W.
Dividing equation 2 by 2, we get: L * (W/4) = 15,000.
Now, we have the following system of equations:
L * W = 60,000.
L * (W/4) = 15,000.
From equation 2, we can express L in terms of W: L = (15,000 * 4) / W.
Substituting this into equation 1, we get: ((15,000 * 4) / W) * W = 60,000.
Simplifying, we have: 60,000 = 60,000.
This equation is always true, which means the value of W can be any positive number.
Therefore, there are infinitely many possible values for the dimensions of the rectangular field that satisfy the given conditions.
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find the dot product f⋅g on the interval [−3,3] for the functions f(x)=sin(x),g(x)=cos(x).
The dot product of f⋅g on the interval [-3, 3] is zero.
What is the dot product on the interval?To find the dot product f⋅g of the functions f(x) = sin(x) and g(x) = cos(x) on the interval [-3, 3], we need to evaluate the integral of their product over the given interval.
The dot product is defined as:
f⋅g = ∫[a, b] f(x)g(x) dx
In this case, a = -3 and b = 3. So, we have:
f⋅g = ∫[-3, 3] sin(x)cos(x) dx
To evaluate this integral, we can use the trigonometric identity:
sin(x)cos(x) = 1/2 sin(2x)
Substituting this identity into the integral, we get:
f⋅g = ∫[-3, 3] (1/2)sin(2x) dx
Next, we can use the property of integrals to factor out the constant (1/2):
f⋅g = (1/2) ∫[-3, 3] sin(2x) dx
Now, we can integrate sin(2x) with respect to x:
f⋅g = (1/2) [-1/2 cos(2x)] | from -3 to 3
Evaluating the limits of integration, we have:
f⋅g = (1/2) [-1/2 cos(2(3)) - (-1/2 cos(2(-3)))]
Simplifying, we get:
f⋅g = (1/2) [-1/2 cos(6) + 1/2 cos(-6)]
Since cos(-θ) = cos(θ), we have:
f⋅g = (1/2) [-1/2 cos(6) + 1/2 cos(6)]
The two cosine terms cancel each other out, leaving us with:
f⋅g = (1/2) * 0
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Consider a non-uniform 10m long cantilever beam, with flexural rigidity of {300 2 + 15 kN/m ifose<5 {300 25-1 kN/m if 5 <1 <10 a) (1 Point) What are the boundary conditions for this beam? b) (3 Points) Calculate the deflection function for this beam under a uniform distributed load of 10N/ over the whole beam.
The boundary conditions of a beam is the relationship between the deflection and slope of the beam at its supports.
The boundary conditions for this beam are:
A cantilever beam is fixed at one end and has a free end. The slope of the beam at the fixed end is zero. The deflection of the beam at the fixed end is zero.b) Deflection function of a cantilever beam under a uniform distributed load is;
∂²y/∂x² = M/EI
Here, M is the bending moment, E is the modulus of elasticity I is the area moment of inertia of the beam.
The bending moment at a distance x from the free end of the beam is;
M = 10x Nm.
Thus,∂²y/∂x² = 10x/{300 (2 + 15x)} [If 0 < x < 5]and∂²y/∂x²
= 10x/{300 (25- x)} [If 5 < x < 10]If 0 < x < 5, integrating once with respect to x:
∂y/∂x = 5x²/{300 (2 + 15x)} + C1
Integrating again with respect to x:∂y²/∂x² = -5x³/{9000 (2 + 15x)} + C1x + C2 ...(1)
At x = 0,
y = 0;
∂y/∂x = 0.
C2 = 0.
At x = 0,
y = 0;
∂y/∂x = 0.
C2 = 0.
At x = 0,
y = 0;
∂y/∂x =
0.C2
= 0.
Also, ∂y/∂x = 0 at
x = 5.
C3 = Δ.
At x = 5,
y = Δ, which is the deflection due to the uniform load of 10 N/m.
Thus, the deflection function of the beam under a uniform distributed load of 10 N/m over the whole beam is given by the equation (2) in the range 0 < x < 5 and the equation (4) in the range 5 < x < 10. The value of Δ is 100/9 mm.
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What is the volume of this cylinder?
Use ≈ 3.14 and round your answer to the nearest hundredth.
Answer:
8,038.4 cubic feet
Step-by-step explanation:
Area = 3.14 x r^2 x h
r = 16; h = 10
3.14 x 16^2 x 10
3.14 x 256 x 10
803.84 x 10
8,038.4
Area = 8,038.4 cubic feet