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lorasvet [3.4K]

3 years ago

12

A moving bumper car hits the back bumper of a stationary bumper car. The momentum of the stationary car increases. Which happens

to the momentum of the moving bumper car?
-it decreases
-it stays the same
-it is converted to inertia

2 answers:

kolbaska11 [484]3 years ago

7 0

It decreases because it gave its momentum to the other car.

Romashka-Z-Leto [24]3 years ago

5 0

"It decreases" is the one among the following choices given in the question that happens to the momentum of the <span>moving bumper car. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that has actually come to your desired help.</span>

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A 0.54 kg particle has a speed of 5.0 m/s at point A and kinetic energy of 7.5 J at point B. What is

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<u>Answers</u>

(a) 6.75 Joules.

(b) 5.27 m/s

(c) 0.75 Joules

<u>Explanation</u>

Kinetic energy is the energy possessed by a body in motion.

(a) its kinetic energy at A?

K.E = 1/2 mv²

= 1/2 × 0.54 × 5²

= 6.75 Joules.

(b) its speed at point B?

K.E = 1/2 mv²

7.5 = 1/2 × 0.54 × V²

V² = 7.5 ÷ 0.27

= 27.77778

V = √27.77778

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(c) the total work done on the particle as it moves from A to B?

Work done = 7.5 - 6.75

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3 years ago

A machine part has the shape of a solid uniform sphere of mass 250 g and a diameter of 4.30 cm. It is spinning about a frictionl

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Answer: $\alpha =9.302\ rad/s^2$

Explanation:

Given

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diameter of sphere $d=4.30\ cm$

radius $r=\frac{4.30}{2}\ cm$

$f=0.0200\ N$

friction will provide resisting torque so

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where $I=\text{moment of Inertia}$

$f=\text{friction force}$

$\alpha =\text{angular acceleration}$

$I=\frac{2}{5}mr^2$

$0.02\times r=\frac{2}{5}mr^2\times \alpha$

$\alpha =\frac{5}{2r}\times f$

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How does the intensity of a sound wave change if the distance from the

Alex17521 [72]

Answer:

The new intensity decreases by a factor of 16.

Explanation:

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or

$I\propto \dfrac{1}{r^2}$ , r is distance from the source

If the distance from the source is increased by a factor of 4, r' = 4r

So,

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3 years ago