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A block is stationary on an inclined pla...

A block is stationary on an inclined plane If the coefficient of friction between the block and the plane is `mu` then
.

A

`mu gttan theta`

B

`f =mg sin theta`

C

`f = mu mg cos theta`

D

the reaction of the ground on the block is mg cos `theta`

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Verified by Experts

The correct Answer is:
a,b
Since the block is stationary `theta lt phi` (angle of repose)
`tan theta lt tan phi` (as `mu = tan phi`)
`:. mu gt tan theta`
Also, applied force `f =mg sin theta` .
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