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प्रश्न
A boy does work when he pushes against a brick wall. (yes/no).
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उत्तर
Yes
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संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
What is the work done by the moon when it revolves around the earth?
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
What is the work done when the object acted upon by a force remains at rest?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
What do you mean by a kilo joule?
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
