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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
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Name a common device where a gear train is used
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.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
What is the SI unit of work?
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
