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प्रश्न
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संबंधित प्रश्न
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
State and define the S.I. unit of work.
What physical quantity does the electron volt (eV) measure? How is it related to the S.I. unit of that quality?
State two factors on which power spent by a source depends. Explain your answer with examples.
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.
Justify the statement. “Power can be expressed as the product of force and velocity.”
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
