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Work, Energy And Power

Question

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What is the work done by tension in the string when a body tied with string completes half the revolution?

Solution

When a body tied to one end of the string is rotated in a circle and it completes half revolution, work done is zero.
This is because

straight theta space equals space 90 to the power of 0

Work done, W = Fs cos

straight theta space left square bracket space straight theta space equals space 90 to the power of straight o space and space cos space 90 to the power of 0 space equals space 0 right square bracket

So, Workd done is 0.

Some More Questions From Work, Energy and Power Chapter

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?

Does the work done by force depend upon the velocity at that instant?

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