For a polymer that was maintained at constant strain, an initial stress of 2.76 MPa decreases to 1.72 MPa after 6 hr. Estimate the stress remaining after 30 hr.

Answer:

(C) the heat capacity for 2nd process is 15 J/K.

Explanation:

Given;

work, W = 100 J

change in temperature, = -5 K

For the first process;

dQ = dU + dW

for adiabatic process, dQ = 0

0 = dU + dW

dU = - dW

dU = -100 (This remains the same for the second process).

For the second process;

Let C be the heat capacity for 2nd process.

C (dT) = dU' + dW'

dU' = dU = -100

W' = 25

dT = -5 (decrease in temperature)

C(-5) = -100 + 25

-5C = -75

C = -75 / -5

C = 15 J/K.

Therefore, the heat capacity for 2nd process is 15 J/K.

Hi! Let's see.

Explanation:

Data:

==================================================================

In order to calculate the mass, we must first find the acceleration.

to find the acceleration, we apply the acceleration formula in UARM:

Replace per data:

We subtract in the numerator:

It divides:

==================================================================

Mass

Knowing it's acceleration, we can proceed to calculate the mass, applying it's formula:

Replace:

Newton equivalents to kilograms:

Simplify the m/s²:

It divides:

Answer: The mass of the body is 472.22 kilograms.

==================================================================

Weight

To calculate the weight, we use it's formula:

Replace:

It multiplies:

Answer: The weight of the body is 4627.75 Newtons.

Final Answer:

Mass = 472.22 kg

Weight = 4627.75 N.

Cordially Alejanndraax. Greetings!

Answer:rotation

Explanation:

Answer:

Objects experiencing projectile motion have a constant velocity in the horizontal direction and a constantly changing velocity in the vertical direction. The trajectory resulting from this combination always has the shape of a parabola.

Explanation:

Answer:

Deny the patent- the machine violates the law of conservation of mass

Explanation:

Took the test

Answer:

water evaporating and condensing, because that's the water cycle and it isnt eroding anything

Answer:

calcium chloride

Explanation:

an inorganic compound,a salt with the chemical formula CaCl2

Answer:

observed frequency =  109.68 Hz

Explanation:

given data

speed u = 20.9 m/s

frequency f = 103 Hz

solution

we consider here speed of sound (v)  is 343 m/s

so observed frequency is express as

observed frequency = f × [tex]\frac{v}{v-u}[/tex]     ...............1

put here value and we get

observed frequency =  103 × \frac{343}{343-20.9}

observed frequency =  109.68 Hz

Answer:1st

Explanation:and object in motion stays in motion unless acted upon by another object

Two figure skaters skate toward each other then push of each other's hands sending them spinning in the opposite direction opposite; - This is Newton's 3rd law of motion. Hence, option (C) is correct.

Newton's third law states that if object A exerts a force on object B, then object B must apply a force to object A that is equal in magnitude and directed in the opposite direction.

This law illustrates a symmetry in nature whereby forces always occur in pairs and whereby no body can exert a force without also being subjected to one.

When two figure skaters skate toward each other then push of each other's hands, they applied force on each other. As according to  Newton's third law of motion every action has equal and opposite reaction, they  moves the opposite direction opposite.

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Answer:

whatttttttttttttttttttttttttttt are the items we have to classify into simple machines and compound machine

Answer: B.75J

Explanation:

Answer:

C

Explanation:

not A as those are frequency higher than what human can hear

b is a joke

Answer: I think the answer is A Relate new Knowledge

Explanation:

It kinda just makes sense.

Answer:

A. Relate new knowledge to what is already known

Explanation:

I took the test

Answer:

The value speed  is  [tex]v = 8.192 \ m/s[/tex]

Explanation:

From the question we are told that

   The mass of the ping pong ball is [tex]m = 0.0027 \ kg[/tex]

    The  radius is  [tex]r = 0.020 \ m[/tex]

     The depth of the ping pong inside the water is  [tex]s = 0.3 \ m[/tex]

Gnerally the force with which the ball will emerge will from the water is mathematically represented as

            [tex]F = B - m g[/tex]

Here B  is the Buoyant force on the ball which is mathematically represented as

         [tex]B = \rho_w * V_b * g[/tex]

Here  [tex]V_b[/tex] is the volume of the ball which is mathematically represented as

       [tex]V_b = \frac{4}{3} * \pi * r^3[/tex]

=>     [tex]V_b = \frac{4}{3} * 3.142 * 0.020 ^3[/tex]

=>     [tex]V_b = 3.35*10^{-5} \ m^3[/tex]

        [tex]\rho_w[/tex]  is the density of water with value  [tex]\rho_w = 1000 \ kg/m^3[/tex]

So  

       [tex]B = 1000 * 3.35*10^{-5} * 9.8[/tex]

=>    [tex]B = 0.3284 \ N[/tex]

So

     [tex]F = 0.3284 - 0.0027 * 9.8[/tex]

=>  [tex]F = 0.3284 - 0.02646[/tex]

=>  [tex]F = 0.3020 \ N[/tex]

Generally force is mathematically represented as

     [tex]F = m * a[/tex]

So

      [tex]0.3020 = 0.0027 * a[/tex]

=>  [tex]a = 111.84 \ m/s^2[/tex]

Generally  from kinematic equation

     [tex]v^2 = u^2 + 2as[/tex]

Here u  is the velocity of the ping pong at depth of  0.3 m and the value is zero given that at that point there was no motion

So

      [tex]v^2 = 0^2 + 2 * 111. 84 * 0.3[/tex]

=>    [tex]v = 8.192 \ m/s[/tex]

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Indigo$}\put(5.7, - 1.2 ){ $\bf Violet $}\end{picture}[/tex]

[tex]\\[/tex]

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[tex]\star\:\:{\sf{\underline{\blue{Examples \ of \ dispersion \ of \ light\:}}}} \\ [/tex]

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Red is the least deviated colour of light.

If Jane wants to know how long her room is, the correct unit for the measurement is meters (m).

In the question, we are told that Jane wants to measure her room. This means that Jane wants to measure length. The only unit of length that is mentioned among the options is meters (m).

This means that, if Jane wants to know how long her room is, the correct unit for the measurement is meters (m).

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Answer: meters (m)

Explanation:

Answer:

The value of x is 3

Explanation:

Equation Solving

We are given the equation

f(x) = 2x + 7

Let's find the value of such that f(x) = 13.

2x + 7 = 13

Subtracting 7:

2x = 13 - 7

2x = 6

Dividing by 2:

x = 6/2

x = 3

The value of x is 3

Answer:

I may not have the answer so i'll just give up some hints.

Multiply the time by the acceleration due to gravity to find the velocity when the object hits the ground. If it takes 9.9 seconds for the object to hit the ground, its velocity is (1.01 s)*(9.8 m/s^2), or 9.9 m/s. Choose how long the object is falling. In this example, we will use the time of 8 seconds. Calculate the final free fall speed (just before hitting the ground) with the formula v = v₀ + gt = 0 + 9.80665 * 8 = 78.45 m/s . Find the free fall distance using the equation s = (1/2)gt² = 0.5 * 9.80665 * 8² = 313.8 m .h = 0.5 * 9.8 * (1.5)^2 = 11m. b. V = gt = 9.8 * 1.5 = 14.7m/s. A feather and brick dropped together. Air resistance causes the feather to fall more slowly. If a feather and a brick were dropped together in a vacuum—that is, an area from which all air has been removed—they would fall at the same rate, and hit the ground at the same time.When an object's point is taller the thing that is going down it will go faster than when the point is lower. EXAMPLE: The object is the tennis ball if you drop it down the higher hill it will be faster than if you drop it down a shorter hill. In other words, if two objects are the same size but one is heavier, the heavier one has greater density than the lighter object. Therefore, when both objects are dropped from the same height and at the same time, the heavier object should hit the ground before the lighter one.

I hope my little bit (big you may say) hint help you with your question.

The change of distance with respect to time is defined as speed.  Speed is a scalar quantity. The speed of brick while hits the ground is 9.90 m/sec.

The change of distance with respect to time is defined as speed.  Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.

The given data in the problem is

m is the mass of block =2.0 Kg

u is the initial velocity of fall =0 m/sec

h is the distance of fall = 5.0 m

g is the acceleration of free fall =10m/sec²

v is the hitting velocity of brick=?

According to Newton's third equation of motion

[tex]\rm v^2=u^2+2gh\\\\ \rm v^2=2gh\\\\ \rm v= \sqrt{2gh}[/tex]

[tex]\rm v= \sqrt{2\times 9.81 \times 5.0} \\\\ \rm v=9.90\;m/sec[/tex]

Hence the speed of the brick while hits the ground is 9.90 m/sec.

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Answer:

Solid at room temperature

Explanation

Since these elements are metals they must be said at room temperature

Answer:

5 cm - 53 degrees

Explanation:

[tex] \sqrt{ {4}^{2} + {3}^{2} } = 5cm[/tex]

[tex] \tan ^{ - 1} (4 \div 3) [/tex] = 53°

Answer:

4

Explanation:

The net force on the box a will be 20 N to the left and that on box b is 6 N downwards. The net force on box  c is 90 N to the left and that on box d is zero.

Force is an external agent acting on a body to change its motion or to deform it. The net force acting on a body depends on all the the forces with their magnitudes and directions.

If two same or different forces acts from the same direction they will add up and net force will be their sum. If they acts from the different directions, they will cancel each other in magnitudes.

In box a, the equal forces of 20 N opposes from each direction cancel and the net force will be 20 N to the left. I box b the 15 N cancel each other. Where the 4N and 2 N add up to have net force of 6 N downwards.

In box c, 10 N from opposite direction cancels and the 60 N and 30 N to the left add ups to have the net force of 90 N to the left. On box d, 5 N from opposite directions cancels as 12 N. Hence, net force is zero.

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Answer: the value of the drain current ID is 3.56 mA

Explanation:

Given that;

IDSS = 8 mA

VP(VGS_OFF) = - 6 V.

VGS = - 2 V

value of the drain current ID = ?

Drain current ID is expressed as;

ID = IDSS [ 1 - (VGS/VP(VGS_OFF)) ]²

we substitute our value

ID = 8 [ 1 - (-2 / -6) ]²

ID = 8 [ 1 - 0.3333 ]²

ID = 8 [ 0.6667 ]²

ID = 8 [ 0.4444 ]

ID = 3.5552 ≈ 3.56 mA

Therefore the value of the drain current ID is 3.56 mA

Answer:

i kinda dnt knw srry wanted the points for the answer

Explanation:

Answer:

The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters

Answer:

The angle is [tex]\theta = 0.52^o[/tex]

Explanation:

From the question we are told that

    The number of order is  n =  1

     The wavelength is   [tex]\lambda = 460 \ nm = 460 *10^{- 9} \ m[/tex]

     The separation between the slit is  [tex]d = 0.0500 \ mm = 5 *10^{-5} \ m[/tex]

Generally the condition for constructive interference is  

         [tex]d sin \theta = n * \lambda[/tex]

=>     [tex]\theta = sin^{-1}[\frac{n * \lambda }{ d} ][/tex]

=>    [tex]\theta = sin^{-1}[\frac{1 * 450 *10^{-9}}{ 5*10^{-5}} ][/tex]

=>    [tex]\theta = sin^{-1}[0.009 ][/tex]

=>    [tex]\theta = 0.52^o[/tex]