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san4es73 [151]
3 years ago
12

Jack pushed and pushed, but no matter how hard he tried, the refrigerator would not budge! What is the BEST explanation of what

happened? A) Jack exerted a force and did work. B) Jack had no energy and did no work. C) Jack used all his potential energy to do work. D) The refrigerator did not move so no work was done.
Physics
2 answers:
Anestetic [448]3 years ago
7 0

Answer:

D) The refrigerator did not move so no work was done.

Explanation:

The refrigerator did not move so no work was done. Jack did exert a force and he did have energy. His muscles were twitching and using stored chemical energy. No work is done, though, if the force or energy does not cause an object to move. No movement, no work.

Brrunno [24]3 years ago
6 0
The answer would be C.

Hope this helps.☺
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Explanation:

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Consider a pendulum of length 3. 171 m. The acceleration of gravity is 9. 832 m/s2. A) what is its period at the north pole?answ
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The period of the pendulum of length 3. 171 m when acceleration of gravity is 9. 832 m/s, is 3.57 seconds.

<h3>What is time period of pendulum?</h3>

Pendulum is the body which is pivoted to a point and perform back and forth motion around that point by swinging due to the influence of gravity.

The time period of a pendulum is the time taken by it to complete one cycle of swing left to right and right to left.

It can be given as,

T=2\pi \sqrt{\dfrac{L}{g}}

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A pendulum of length 3.171 m. The acceleration of gravity is 9.832 m/s2. The period at the north pole is,

T=2\pi \sqrt{\dfrac{3.171}{9.832}}\\T=3.57\rm\; s

Thus, the period of the pendulum of length 3. 171 m when acceleration of gravity is 9. 832 m/s, is 3.57 seconds.

Learn more about the time period of pendulum here;

brainly.com/question/3551146

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