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4 years ago

2 Points

Physics

1 answer:

vesna_86 [32]4 years ago

3 0

Answer:

A. Sound comes from the ball every time it bounces.

B. The ball is warmer after it stops bouncing than it was before it

started bouncing

Explanation:

It is evidently shown that the ball shown energy transformation because it produces sound at each bounce and also becomes warmer after the bounce.

The law of conservation of energy suggests that energy is neither created nor destroyed but transformed from one form to another.

a bouncing ball produces sound energy at each bounce. This is conversion of potential energy initially of the ball into kinetic energy of sound.
Also, the motion of the ball produces kinetic energy which causes the ball to warm up, this is thermal energy.
We see that a ball originally with potential energy has yielded the kinetic forms of energy which are sound and thermal energy.

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Answer:

The centripetal acceleration at highway speed is greater.

Explanation:

We assume the motion of the car is uniformly accelerated. Let the highway speed be v.

By the equation of motion,

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Because the car starts from rest, u = 0.

$a_T=\dfrac{v}{t}$

This is the tangential acceleration of the thread of the tire.

The centripetal acceleration is given by

$a_C=\dfrac{v^2}{r}$

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Comparing both accelerations and applying commonly expected values to r and t, the centripetal acceleration is seen to be greater. The radius of a tyre is, on the average, less than 0.4 m. Then the centripetal acceleration is about

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3 years ago

If a girl is running along a straight road with a uniform velocity 1.5 m/s, find her

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Answer:

Explanation:

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3 years ago

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Answer:

3.90 degrees

Explanation:

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W = mg = 30*9.81 = 294.3 N

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We can calculate the parallel one since it's the one that affects the force required to push up

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Since customer would not complain if the force is no more than 20N

F = 20

$294.3sin\theta = 20$

$sin\theta = 20/294.3 = 0.068$

$\theta = sin^{-1}0.068 = 0.068 rad = 0.068*180/\pi \approx 3.90^0$

So the ramp cannot be larger than 3.9 degrees

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Answer:

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