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Find the least horizontal force P to sta...

Find the least horizontal force P to start motion of any part of the system of the three blocks resting upon one another as shown in figure The weights of blocks are `A = 300 N , B = 100 N` and `C = 200 N` .Between A and B , the coefficient of friction is `0.3` between B and C is `0.2` and between C and the ground is `0.1`

A

`60N`

B

`90N`

C

`80N`

D

`70N`

Text Solution

Verified by Experts

The correct Answer is:
A
`f_(l_(1)) = mu_(1) m_(A) g, f_(l_(2)) = mu_(2) (m_(A)+m_(B))g`
`f_(l_(3)) =mu_(3) (m_(A) +m_(B) +m_(C))g` .
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