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If tan 0 gt mu then minimum force neede...

If `tan 0 gt mu` then minimum force needed to stay block at rest is

A

`mg sin theta - mu mg cos theta`

B

`(mg sin theta - mu mg cos theta)/(sqrt(1+mu^(2)))`

C

`mg sin theta+mu mg cos theta`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
B
If `tan theta gt mu` ………….
`F cos phi+muN = mg sin theta`
`N = mg cos theta+F sin phi`
`F = (mg sin theta - mu mg cos theta)/(mu sin phi+cos phi)`
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