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संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
State and define the S.I. unit of work.
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
Name the quality which is measured in kW.
Is it possible that no transfer of energy may take place even when a force is applied to a body?
State the condition when the work done by a force is negative. Explain with the help of examples.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
What do you understand by work? Is work a scalar or a vector quantity?
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
