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A man wants to slide down a block of mas...

A man wants to slide down a block of mass `m` which is kept on a fixed inclined plane of inclination `30^(@)` as shown in the figure .Initially the block is not sliding .
To just start sliding the man pushed the block down the inclined with a force `F`. Now , the block starts accelerating. To move it downwards with conatant speed the man starts pulling the block with same force. Surface are such that ratio of maximum static friction to kinetic friction is `2` Now, answer the following questions.

If the man wants to move the block up the inclined , what minimum force is required to start the motion?

A

`(2)/(3) mg`

B

`(mg)/(2)`

C

`(7 mg)/(6)`

D

`(5 mg)/(6)`

Text Solution

Verified by Experts

The correct Answer is:
C
`F' = mg sin theta + mu_(s) mg cos theta`
`= (mg)/(2) + (4)/(3 sqrt3) mg ((sqrt3)/(2))`
`= (7 mg)/(6)`
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