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प्रश्न
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.
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उत्तर
The work done by two persons, A and B, does not depend upon time. Therefore, both will do the same amount of work. Thus, we arrive to the conclusion that
Work done by A = Force × height = mgh
Work done by B = Force × height = mgh
∴ mgh = mgh
`"Work done by A"/"Work done by B" = 1/1` = 1 : 1
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
What do you mean by degradation of energy?
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Give two examples of work done.
Name the material commonly used for the manufacturing of solar cells.
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
