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प्रश्न
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संबंधित प्रश्न
Define 1 J of work.
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
What are the units of (a) work, and (b) energy?
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
Give an example
Electrical energy changes to heat energy.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
