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Two block A and B are as shown in figure...

Two block `A` and `B` are as shown in figure. The minimum horizantal force `F` applied to the block `B` for which slipping begins between `B` and ground is `:`

A

`20N`

B

`120N`

C

`150N`

D

`170N`

Text Solution

Verified by Experts

The correct Answer is:
C

`(f_(1))_lim=mu_(1)N_(1)`
`=(0.2)(10g)`
`=20N`
`(f_(2))_lim=mu_(2)N_(2)`
`=(0.5)(30g)`
`=150N`
Slipping at ground will begin.
Only when, `Fgt(f_(2))_(limit)`
So, `Fgt150`
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