A cleaner moves his hands up and down once on a smooth glass window. Tell the direction of friction in the process.

First up then down

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Smooth glass does not provide friction

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Either up or down throughout

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First down then up

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Solution

The correct option is D First down then up

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Q. A man generates a symmetrical pulse i a string by moving his hand up and down. At

t = 0

the point in his hand moves downward. The pulses travels with speed of

3 m / s

on the string & his hands passes

6

times in each second from the mean position. Then the point on the string at a distance

3 m

will reached its upper extreme first time at time

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