The rough region would the block travel if it had a mass of 2M is L/2. Option B.
Solution:
[tex]\frac{1}{2}[/tex] KA² = MGL 2
Similarly, for the second case, we can write (let the distance traveled is x)
[tex]\frac{1}{2}[/tex]kA²= 2u Mgx
Dividing the above equations we can write,
[tex]2x = L \Rightarrow x = \frac{L}{2}[/tex]
A property of a body that is a measure of inertia is usually viewed as a measure of the amount of matter contained in the body that causes it to have weight in a gravitational field. Mass is a dimensionless quantity that describes the amount of matter in a particle or object.
The mass of an object is a measure of its inertial properties or the amount of matter it contains. The weight of an object is a measure of the force exerted on it by gravity, or the force required to support it. Mass can best be understood as the amount of matter present in an object or body. Everything around us has mass.
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what have the water-related discoveries (made by spacecraft at mars) implied about its atmosphere in the distant past?
The atmosphere may have been thicker and had a stronger greenhouse effect, to allow liquid water to exist on the surface.
Explain in detail.
Water ice on Mars is most likely found in global planar terrain. This type of terrain is relatively flat and is mapped out by the Martian terrain. Nearly all of the water on Mars today is in the form of ice, although there are small amounts of water vapor present in the atmosphere.The moon and Mars both have ice that could theoretically be turned into drinking water.To know more about Mars here
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the current in a certain ac circuit is independent of the frequency at a given voltage. which combination of elements is most likely to comprise the circuit?
A capacitor and a resistor in series. This is known as a low-pass filter, and it attenuates higher frequencies more than lower frequencies, so at a given voltage the current will not depend on the frequency.
What is frequency?
In physics, frequency is the amount of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time. After moving through a series of situations or positions and then returning to its initial position, a body in periodic motion is thought to have experienced one cycle or one vibration. See also simple harmonic motion and angular velocity.
The frequency is 2 per second if the period, or time interval, needed to complete one cycle as well as vibration is 1/2 second; it is 100 per hour if the period is 1/100 of an hour. In most cases, the frequency is equal to the period, or time interval, reciprocally, so frequency = 1/period = 1. (time interval).
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6. A 1400 kg car is also traveling in a straight line. Its momentum is equal to that *
of the truck in the previous question. What is the velocity of the car? ROUND TO
THE NEAREST HUNDREDTHS (2 DECIMAL PLACES)
Answer:
V = 2.86 m/s
Explanation:
Given:
m = 1400 kg
p = 4000 kg·m/s
_________________
V- ?
Momentum:
p = m·V
Velocity:
V = p / m
V = 4000 / 1400 ≈ 2.86 m/s
three capacitors of values of 1.0 μf, 1.5 μf, and 2.0 μf each are connected in series. what is the equivalent capacitance?
If three capacitors with values of each are connected in series, the corresponding capacitance is 46 mF 1 / (1/1.)+(1/1.5)+(1/2.).
What is a capacitor used for?An electrical energy storage device is a capacitor. It has two conductors in it that appear to be close to one another but are kept apart. A straightforward example of a particular storage device is the parallel-plate capacitor.Equivalent Capacitance for three capacitors in series can be given by the following equation. 1/C = 1/C1 + 1/C2 + 1/C3.
What are capacitors' two most frequent applications?Capacitors are most frequently used for signal coupling and decoupling, power conditioning, electronic noise filtering, energy storage, and remote sensing. Capacitors are employed in many different industries since they have a crucial and adaptable role for a variety of applications.
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a figure skater is rotating with her arms stretched out away from her body. as she pulls her arms in towards her body, what happens to her angular velocity?
She draws her arms close to her body, decreasing her moment of inertia, to quicken the rotational velocity of her spin. Due to the conservation of angular momentum, rotational velocity will increase,
What are Rotational Velocity ?The angular velocity (w), a vector quantity in uniform circular motion, is determined by dividing the angular displacement (ΔФ a vector quantity), also a vector quantity, by the change in time (t). Speed is equal to the arc length travelled (S) divided by the change in time (Δ), which is also equal to ||R.
According to the above given information
We got to know that
She draws her arms close to her body, decreasing her moment of inertia, to quicken the rotational velocity of her spin. Due to the conservation of angular momentum, rotational velocity will increase.
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Consider a proton, an electron, and a helium nucleus (alpha particle) moving at the same speed vv. List their de broglie wavelengths from largest to smallest.
The sequence for de broglie wavelengths from largest to smallest is electron > proton > helium.
de broglie wavelength is an important concept to study various phenomenon in quantum mechanics.
Mathematically, de broglie wavelength equation is λ = h/p (p=mv)Where, h is the Plank's constant
m is the mass of the particle
v is the velocity of particle.
mass of proton = mp = 1.6 x [tex]10^{-27}[/tex] kg
mass of electron, me = 9.1 x [tex]10^{-31}[/tex] kg
mass of helium nucleus, mHe = 6.6 x [tex]10^{-27}[/tex] kg
As the velocity of all the three elements are same as v.
According to the de Broglie wavelength formula, since v is same for all λ is inversely proportional to the mass of the element.
Lesser the mass more will be the de broglie wavelength.
Here, mass of electron < mass of proton < mass of helium nucleus.
So, de broglie wavelength of electron > de broglie wavelength of proton > de broglie wavelength of helium nucleus.
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xa student fires a cannonball diagonally with an initial speed of 35.0m/s. neglect drag and the initial height of the cannonball. what is the max height
2.23 seconds is the cannons' total flight time.
What is Acceleration due to gravity ?
The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity. M/[tex]s^{2}[/tex] is its SI unit. Both magnitude and direction are present.
According to the information
A diagonal ball is launched at a 45° angle from the horizontal. The ball is being fired in a projectile motion. A projectile is a motion in which a body that has been discharged into space with a velocity U is allowed to fall freely while being affected by gravity.
The cannon ball's total flight time, T, can be represented as;
where T = 2Usin(theta)/g;
U is the ball's starting speed, which is 35 m/s.
The angle the ball makes with the horizontal is theta, which is equal to 45°.
The acceleration caused by gravity is g = 9.81 m/[tex]s^{2}[/tex]
Incorporating the provided data into the existing formula;
T = 35sin45°/9.81
T = 35×0.7071/9.81
T = 24.74/9.81
2.52 seconds later
2.23 seconds is the cannons' total flight time.
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which type of galaxy is very difficult to see, but (astronomers recently realized) may be very common?
A dwarf ellipse. Despite being incredibly difficult to view, astronomers recently realised that this form of galaxy may be quite common.
What is a galaxy?
A galaxy is a vast collection of stars, solar systems, gas, and dust. Gravity holds a galaxy together. There is also a black hole at the centre of our galaxy milkyway.
Dwarf On a smaller scale, elliptical galaxies seem to share many of the same global characteristics as typical elliptical galaxies. They lack recent star formation, are elliptical in shape, and have very little to no gas. The most prevalent type of galaxy in the cosmos is a dwarf galaxy, but because of their small size, low mass, and low luminosity, they are hard to find.
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Complete the energy maximum electron capacity for each energy level. Energy level 1 maximum electron capacity is. Energy level 2 maximum electron capacity is. Energy level 3 maximum electron capacity is. Energy level 4 maximum electron capacity is.
Energy level 1 maximum electron capacity: 2, Energy level 2 maximum electron capacity: 8, Energy level 3 maximum electron capacity: 18 and Energy level 4 maximum electron capacity: 32.
What is Energy?
Energy, which is observable in the work performed as well as in the form of heat and light, is indeed the quantitative property that's also transferred to a body or a physical system in physics. Energy is a conserved resource; according to the principle of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed. The joule is the SI's (International System of Units) measurement unit for energy (J). The kinetic energy of the a moving object, this same potential energy held by an object (for example, due to it's own position in a field), this same elastic energy held in a solid object, chemical energy linked to chemical reactions, and radiant energy conducted by electromagnetic radiation are examples of common forms of energy.
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At a hydroelectric power plant, water is directed at high speed against turbine blades on an axle that turns an electric generator. For maximum power generation, should the turbine be designed so that the water is brought to a dead stop, or so that the water rebounds? If only an external force can change the momentum of the center of mass of an object, how can the internal force of the engine accelerate a car?
Ideally, the water bounces off the turbine blades, maximizing electricity era. when water splashes, momentum changes extra than while you are simply status.
Also, if the change in momentum of the water is greater than the alternate in momentum of the blade, the blade will spin faster. Consistent with the laws of movement, the momentum of the center of gravity of an object can most effective be changed by the movement of an external force.
But, because of the frictional force generated while the tires contact the ground, the internal force of the engine is added, allowing the automobile to accelerate.
Hydro turbines convert the strength of flowing water into mechanical energy. A hydroelectric generator converts this mechanical power into energy. A high stress water jet is pressed towards the turbine blades. The route of flow modifications. The ensuing change in momentum exerts a force on the turbine blades, inflicting the turbine to rotate.
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In comparing two unequal forces on a rigid body, is it possible to have the larger force produce less torque than the smaller force?.
Yes, it is possible to have the larger force produce less torque than the smaller force. It is possible for the larger force to be applied closely enough to the center of mass of the rigid body due to which its resulting torque is smaller than that of a smaller force applied at a point far from the center of mass.
What is force?Force is an external cause due to which a body tends to modify or change its state. Due to application of force, the body can also change its size, shape, and direction. Force has both direction and magnitude.
Force = mass × acceleration
What is torque?The force that can cause an object to rotate along an axis is measured as torque.
[tex]\tau = rF\sin\theta[/tex]
Here, [tex]\tau \\[/tex] = Torque
r = radius
F = force
[tex]\theta[/tex] = the angle between the F and the lever arm
In the given question, lets assume the following,
F = Large force
d = Distance from the point of application of the large force to center of mass
f = Small force
D = Distance from the point of application the of small force to center of mass
Now,
Assuming D > d (i.e, D is greater than d).
The torque caused by the large force is Fd, and the torque caused by the little force is fD if the forces are applied perpendicular to the body's axis. Hence, depending on the values of F, f, D, and d, we can have Fd < fD.
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A luge and its rider, with a total mass of 85 kg, emerge from a downhill track on to a horizontal straight track with an initial speed of 37 m/s. If a force slows them to a stop at a constant rate of 2.0 m/s 2
, (a) what magnitude F is required for the force, (b) what distanced do they travel while slowing, and (c) what work W is done on them by the force? What are (d) F, (e) d, and (f) W if they, instead,slow at 4.0 m/s 2
?
Force required is: -170N for the distance of 342.25m.
a) F=ma
F= - 85×2.0 = - 170
b) using energy
5×85×37²=170×d
d = 342.25 m
c) The work done would be given by
W= F×d
W =(−1.7×10²N)×(3.4×10²)
W=−5.8×[tex]10^{4}[/tex]J
d) The net force on the mass would be
F = ma
F = -340 NF
-ve sign indicates that the force acts opposite to the direction of motion.
e) Using the kinematic equation
v²= u² + 2ad
d= 1.7 × 10² m
f) The work done would be given by
W= F×d
W= -5.8 × [tex]10^{4}[/tex]
-ve sign indicates that the energy of the rider decreases by the force
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what range of spring constant values will cause the motion of the system to have damped oscillation?
The system's behavior becomes more elastic when the spring constant, k, is increased, as is the Q factor
How might one raise the spring constant?Since a spring's constant k and its length are inversely related, when a spring is divided into n parts, the length increases by 1n, making the spring constant k/(1/n)=nk.
How do mass and the spring constant relate?The square root of the mass and the spring constant have opposite relationships with respect to the period of a spring-mass system.
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a ball is thrown eastward into the air from the origin (in the direction of the positive x-axis). the initial velocity is 40 i 80 k, with speed measured in feet per second. the spin of the ball results in a southward acceleration of 8 ft/s2, so the acceleration vector is a
The ball falls to the ground with a magnitude of 244.8 feet and a speed of 91.0 feet per second.
What is kinetics?In this situation, we have a three-dimensional problem that kinematics can help us solve by determining the position, velocity, and acceleration of the body.
The vector, which is the ball's position in the air at time t,
p(t) = (60 i + 64 k) t + 1/2 (-6 j - 32 k) t ²
and its velocity is given by
v(t) = (60 i + 64 k) + (-6 j - 32 k) t
The time the ball is in the air is equal to the time it takes for the position vector's vertical (k) component to reach zero, so we solve,
64 t - 32/2 t ² = 0 ==> t = 0 OR t = 4
and so the ball is in the air for 4 s.
The ball has position vector.
p(4) = (60 i + 64 k) t + 1/2 (-6 j - 32 k) t ² = 240 i - 48 j
which has magnitude.
||p(4)|| = √(240² + (-48)²) = 48 √26 ≈ 244.8 ft
in the direction of the positive x axis in the x, y plane so that
tanθ = -48/240 = -1/5 ==> θ = -arctan(1/5) ≈ -11.3º
or 11.3º South of East.
The ball swiftly strikes the ground.
||v(4)|| = ||60 i - 24 j - 64 k|| = √(60² + (-24)² + (-64)²) = 4 √517 ≈ 91.0 ft/s.
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about how long does one day last at the north pole on uranus? one day is defined as the time from sunrise to sunset.
On the north pole, one day for about 17 hours on uranus.
Its call is a reference to the Greek god of the sky, Uranus, who, in step with Greek mythology, was the extremely good grandfather of Ares, grandfather of Zeus, and father of Cronus.
Uranus is the only planet whose equator is sort of at a proper attitude to its orbit, with a tilt of 97.77 degrees – likely the end result of a collision with an Earth-sized item lengthy in the past.
The blue-inexperienced color effects from the absorption of crimson light by way of methane gas in Uranus' deep, cold, and remarkably clean surroundings.
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a car is traveling with a speed of 20.0 m/s along a straight horizontal road. the wheels have a radius of 0.300 m. if the car speeds up with a linear acceleration of 1.50 m/s2 for 8.00 s, find the angular displacement of each wheel during this period.
The angular displacement of each wheel during this period will be 209 rad
Explain angular displacement
A body's angular displacement is the angle (measured in radians, degrees, or revolutions) by which a point rotates around a specific axis or center in a particular way. Because a body rotating about its axis experiences variable velocities and accelerations at all times, the motion cannot simply be considered as a particle motion (t).
We must first assume that the car's wheels are not slipping in relation to the pavement. If so, we can infer that the angular velocity and acceleration are given by
w = v/r = (20m/s)/(.300 m) = 6 rad/s
a = a/r = (1.5 m/s2)/(.300 m) = 5 rad/s2
Using this data, we can calculate the angular displacement by:
angular displacement = (6 rad/s)(8.00 s) + .5(5 rad/s2)(8.00 s)2
= 48 rad + 160 rad = 209 rad
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A force of 203 N is exerted on 8.11 -kg bowling ball over time span of 0.784 seconds
The change in momentum of the bowling ball of mass 8.11 kg is 159.152 kgm/s.
What is change in momentum?The change in the momentum is equal to the product of the mass and the change in the velocity.
To calculate the change in momentum of the bowling ball, we use the formula below.
Formula:
ΔM = Ft............ Equation 1Where:
ΔM = Change in momentumF = Force applied to the bowling ballt = TimeFrom the question,
Given:
F = 203 Nt = 0.784 sSubstitute these values into equation 1
ΔM = 203×0.784ΔM = 159.152 kgm/sHence, the change in momentum of the ball is 159.152 kgm/s.
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Complete question: A force of 203 N is exerted on 8.11 -kg bowling ball over time span of 0.784 seconds. Calculate the change in momentum of the bowling ball
a proton has a mass of 1.67×10−27 kg . if the spring were to break, the α particle would disintegrate and the protons would fly off in opposite directions. what would be their ultimate speed?
The ultimate speed is 0.333× 10⁸ ms‐¹.
The proton mass is 1.67×10−27 kg. If the spring were to break, the alpha particles would collapse and the protons would fly in the opposite direction.
Calculation:-
Deuterons:= 0.333×108ms−1
m2=3.34×1027kgu2=0
Let v be the velocity of the combination
Then from momentum conservation
m1u1+ m2u2= (m1+m2)v
1.67×1027×108+3.34×1027
= ( 1.67+3.34)×10−27×v
binding velocity
v=1.67×10−27×1085.01×10−27
= 0.333×108ms−1
A proton is a stable subatomic particle with a positive charge of +1 e elementary charge, symbol p, H+, or 1H+. Its mass is slightly less than that of a neutron, 1836 times that of an electron (proton-to-electron mass ratio). Protons and neutrons, each with about one atomic mass unit, are collectively called "nucleons" (particles present in the nucleus)
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A proton and an electron are placed in an electric field. Which undergoes the lesser acceleration?.
Proton will undergoes the lesser acceleration
What happens when Electron and proton are kept in Electric field ?Due to the opposite polarity of an electron and a proton, when they are in an electric field, they are attracted to one another by an electrical force of equal strength. However, because of their opposing charges, the force's direction will be the opposite.
An electron will accelerate more quickly than a proton because of the difference in mass between the two particles.
Thus, the electric forces acting on them will be equal in strength but directed in the opposite direction. Since the mass of the proton is 1836 times greater than the mass of the electron, its acceleration will be [1/1836] times greater.
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two vectors vector a and vector b, each located in a different position in the plane, have equal magnitude and the same direction. what can be said about the relationship of vector a and vector b? (select all that apply.)
Two vectors vector a and vector b, each located in a different position in the plane, have equal magnitude and the same direction, both vectors are considered to be parallel to each other.
Two vectors are said to be parallel if and as it were in case the angle between them is degrees. Parallel vectors are too known as collinear vectors, that is two parallel vectors will be continuously parallel to the same line but they can be either within the same direction or within the exact inverse direction. The cross product of any two parallel vectors could be a zero vector. For any two parallel vectors a and b, their dot product is equal to the product of their magnitudes.
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a racing car travels with a constant tangential speed of 75.0 m/s around a circular track of radius 625 m. find (a) the magnitude of the car's total acceleration and (b) the direction of its total acceleration relative to the radial direction.
The racing car travels with a constant tangential speed of 75.0 m/s around a circular track of radius 625 m are:
Constant Velocity , u = 75 m/s
Radius , r = 625 m
a) Total Acceleration = v^2/r
Total Acceleration = 75^2/(625)
Total Acceleration Acceleration = 9 m/s^2
The magnitude of the total acceleration is 9 m/s^2
b) Since the velocity is constant
The tangential acceleration is zero
The total acceleration is therefore the radial acceleration.
the direction of total acceleration relative to radial direction is zero
Acceleration is the name we give to the process of changing velocity. Velocity is speed and direction, so there are only two ways to accelerate. Either change speed, change direction, or change both
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a commuter train passes a passenger platform at a constant speed of 42.8 m/s. the train horn is sounded at its characteristic frequency of 342 hz. (a) what overall change in frequency is detected by a person on the platform as the train moves from approaching to receding? (indicate whether the frequency increases of decreases with the sign of your answer.)
A commuter train passes a passenger platform at a constant speed of 42.8 m/s. the train horn is sounded at its characteristic frequency of 342 Hz: The train's speed is st=43.5m/sst=43.5m/s.
Frequency, in physics, is the number of waves that skip a hard and fast factor in unit time; also, the number of cycles or vibrations passed through in the course of one unit of time by way of a frame in periodic movement. The frequency of a particular statistic is the number of instances the facts price occurs. We constitute the frequency of a facts fee with the aid of f. as an instance if five students were given an A in technology, after which grade A is said to have a frequency of 5.
Frequency is the range of occurrences of a repeating occasion per unit of time. it's also once in a while called temporal frequency to emphasize the assessment of spatial frequency, and normal frequency to emphasize the difference from angular frequency.
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two light bulbs are 1.10 m apart. from what distance can these light bulbs be marginally resolved by a small telescope with a 4.00 cm -diameter objective lens? you may want to review (pages 1011 - 1014) .
The two light bulbs are to be resolved at a distance of 60.1 km.
The formula of Rayleigh criterion for the diffraction limit is
[tex]\theta \:=\: 1.22 \: \frac{\lambda}{D}[/tex]
where
λ = the radiation wavelength (m)D = the diameter of lens (m) = 4.00 cm 4.00 × 10⁻² mθ = limited angle (rad)Because in problems didn't give the detail about the wavelength, for visible light the radiation wavelength is 750 nm - 400 nm. In this problems I assume λ = 600 nm = 600 × 10⁻⁹ m = 6 × 10⁻⁷ m
[tex]\theta \:=\: 1.22 \: \frac{\lambda}{D}[/tex]
θ D = 1.22 λ
θ × 4.00 × 10⁻² = 1.22 × 6 × 10⁻⁷
θ = (7.32 × 10⁻⁷) ÷ (4.00 × 10⁻²)
θ = 1.83 × 10⁻⁵ rad
The angle for the light bulbs
[tex]\theta = \frac{s}{r}[/tex]
where
s = the width between two light bulbs (m)r = the distance light bulbs are resolved (m)s = θr
r = 1.1 ÷ (1.83 × 10⁻⁵)
r = 6.01 × 10⁴ m
r = 60.1 km
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Circle the contact forces from the list:
Magnetism
Air resistance
Weight
Upthrust
Reaction
A block with mass 0.50 kg is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 m (the figure (Figure 1)). When released, the block moves on a horizontal tabletop for 1.00 m before coming to rest. The spring constant k is 100 N/m. What is the coefficient of kinetic friction mu _k between the block and the tabletop? Express your answer using two significant figures. mu _k = __________
The answer is 0.408.
According to the principle of conservation of energy when a friction force acts within an isolated system, we have
ΔE = ΔU + ΔK = -[tex]f_{Friction}[/tex]d
= k[tex]x^{2}_{0}[/tex]/2 = [tex]f_{Friction}[/tex]d--------------------(1)
[tex]f_{Friction}[/tex] = [tex]u_{k}[/tex]N = [tex]u_{k}[/tex] = [tex]u_{k}[/tex]mg---------------------(2)
inserting eq. (2) into (1),
[tex]u_{k}[/tex]= k[tex]x^{2}_{0}[/tex]/2mgd
inserting data given,
[tex]u_{k}[/tex]= 0.408163265 ≈ 0.408
Therefore, the answer is: 0.408
What is coefficient of kinetic friction ?
A sophisticated method for determining the dynamic coefficient of friction. The sliding friction coefficient μk is the ratio of the friction force to the normal force experienced by an object moving on a dry, uneven surface.
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The block and the tabletop have a 0.41 coefficient of kinetic friction, according to the supplied statement.
What exactly are static and kinetic friction?The box can't move on its own because of static friction; this friction must be overcome by an opposing army that is large enough for the box to move. When surfaces are moving, a force called kinetic friction, also known as dynamic friction, fights the movement of the surfaces.
Briefing:The parameters supplied:
Block's mass, m, is equal to 0.50 kg.
Spring extension, when x=0.2 m
100 N/m is the spring constant, K.
By using the law of conservation of energy, we can calculate the kinetic friction coefficient that exists between block and the tabletop, as illustrated below.
[tex]\begin{aligned}& \mathrm{Fd}=U_x \\& \mu \mathrm{mgd}=1 / 2 \mathrm{kx}{ }^2\end{aligned}[/tex]
where;
μ is the coefficient of kinetic friction.
The block's and the tabletop's kinetic friction coefficient is:
[tex]\begin{aligned}& \mu_k=\frac{k x^2}{m g d} \\& \mu_k=\frac{100 \times 0.2^2}{2 \times 0.5 \times 9.8 \times 1} \\& \mu_k=0.41\end{aligned}[/tex]
Therefore, the block's and the tabletop's value of kinetic friction is 0.41.
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a car traveling at 41 ft/sec decelerates at a constant 2 feet per second per second. how many feet does the car travel before coming to a complete stop?
The distance that the car will travel before coming to a complete stop is 82ft.
How to calculate distance?Distance is the amount of space between two points, usually geographical points, usually (but not necessarily) measured along a straight line.
The distance of a moving object can be calculated using the following formula:
Speed = distance ÷ time
According to this question, a car traveling at 41 ft/sec decelerates at a constant 2 feet per second. The distance can be calculated as follows:
41ft/sec = D/2
Distance = 82feet
Therefore, 82ft is the distance of the car travelling.
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Question 1 options:
60 miles
1 mile
60 miles per hour
Trick question. You can't go 60 miles if an hour has 60 minutes
Answer:
Explanation:
You can drive at 60 miles per hour
D = 60 miles
t = 1 hour
Speed:
V = D / t = 60 / 1 = 60 mph
how fast must air blow across the top of the straw to draw water to the top of the straw? assume that the density of air is
The air blows across the straw's top at a speed of 122.79H m/s, causing water to collect there. To get water to collect at the straw's top, air is blown over it.
A moving object is said to be moving at a variable pace when it travels a varying distance at regular intervals of straw's top. The uniform speed determined by the ratio of the whole distance travelled by an object to the total amount of time it took to travel that distance is known as the average speed. Air blow straw's top are renowned to offer targeted, high-pressure output and are most ideal for automotive and industrial cleaning applications.
1/2*density* v = density*g*h
v = (density of b / 2*density*g*h)1/2
= (2*1000*9.8*h/1.3)\sv = 122.79h
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spray sunscreens generally have a longer shelf-life than cream sunscreen formulations. why might this be?
This is because spray sunscreens contain fewer ingredients and preservatives than cream sunscreens.
What is sunscreen?
Sunscreen, also referred to as sunblock as well as sun cream, is a topical photoprotective product for the skin that primarily absorbs or, to a much lesser extent, reflects some ultraviolet (UV) radiation from the sun. This helps prevent sunburn and, more importantly, skin cancer. Lotions, sprays, hydrocolloids, foams, sticks, powders, as well as other topical products are all forms of sunscreen. Sunscreens are common additions to clothing, especially sunglasses, sunhats, and other types of photoprotective clothing (such as umbrellas). H.A. Milton Blake, an Australian chemist, created the first sunscreen in 1932 using a 10% concentration of the UV filter salol (phenyl salicylate).
Since they do not contain as many active ingredients, they are less likely to expire quickly. Additionally, because the sunscreen is in a spray form, it is less likely to be contaminated with bacteria or dirt, which can cause it to expire more quickly.
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3. a resistor r is connected to a 12 v ideal battery. the total current increases five times when a 400 ohm resistor is added in parallel with it. the value of resistance r is:
The value of resistance r is 100ohm
Define resistance.
The opposition a substance provides to the flow of electrical current is referred to as resistance. The capital letter R is used to symbolize it. The ohm, which can be written as a word or represented by the Greek letter omega Ω in uppercase, is the universal unit of resistance.
Because the output current of the first resistor flows into the input of the second resistor in a series circuit, the current through each resistor is equal. All of the resistor leads on one side of the resistors are connected together, as are all of the leads on the other side, in a parallel circuit.
In a parallell circuit,
1/R = 1/R1 + 1/R2
Given R1= r
R2= 400
I= 5
V= 12V
1 / R + 1 / 400 = 5 / R
1 / 400 = 4 / R
R = 400/4
R= 100ohm
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