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Work, Energy And Power

Question

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A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?

Solution

The man is doing zero work because he is at rest w.r.t. shore. Hence, displacement is zero.
Therefore work done by the man is zero.

Some More Questions From Work, Energy and Power Chapter

Define watt.

How many joules are there in one eV?

What is the relation between kWh and Joule?

Does the body at rest possess energy?

By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?

A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?

Is frictional force conservative?

What is the work done by gravitational force in taking the mass m with constant velocity through height h?

A mass is tied with a string and whirled in horizontal circle. What is the work done by tension force?

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