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ira [324]
3 years ago
15

In which activity is no work done?

Physics
2 answers:
Doss [256]3 years ago
5 0

Answer: The correct option is B.

Explanation:

Work is done when the force is applied to move an object to certain distance.

In the case of lifting a book, the work is done as the force is applied to lift the book. There will be displacement.

In the case of holding a brick, no work is done as the force is applied in this case but there is no displacement.

In the case of climbing stairs, work is done in climbing the stairs as the force is acting here. There will be displacement when the man will climb.

In the case of pushing a shopping cart, the work is done as the force is applied to a shopping cart. There will be displacement in forward direction.

Therefore, the correct answer is B.

sleet_krkn [62]3 years ago
3 0
The answer is B because you are not using force or energy as if you were if you were to lift or push something.
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Alternative therapies usually have not gain a scientific approval from the scientific community, but there are some therapies that show positive results even though it is still has not proved by studies or researches. So it's important for physicians to be respectful if the patient choose to do it
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An object at rest on a flat, horizontal surface explodes into two fragments, one seven times as massive as the other. the heavie
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3 years ago
It is dangerous to stand near the railway leak when train passing by,why?​
4vir4ik [10]

Answer:

Because a person may be pulled in the direction of the moving train. Thereby causing accident

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As a result, a person near a moving train may be pulled in the direction of the moving train. Thereby causing accidents that may lead to death.

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3 years ago
If you pull horizontally on a desk with a force of 150 N and the desk doesn't move, the friction force must be 150 N. Now if you
s344n2d4d5 [400]

Answer:

The friction force is 250 N

Explanation:

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\sum F=ma

In this case, we know that the acceleration is zero: a = 0, so also the resultant of the forces must be zero:

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3 years ago
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sorry if i'm mistaken but i'm pretty sure its A) Y

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2 years ago
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