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Each of the two block shown in the figur...

Each of the two block shown in the figure has mass m. The pulley is smooth and the coefficient of friction for all surfaces in contact is `mu`. A constant horizontal force `P` applied in two cases shown in such a way that block A start just sliding then the value of minimum force `P` in case-I and case-II is :

A

`2mumg,3mumg`

B

`3mumg,2mumg`

C

`4mumg,3mumg`

D

`3mumg,3mumg`

Text Solution

Verified by Experts

The correct Answer is:
C
Case-I

`T-mumg=ma`........(1)

`P-T-3mumg=ma`
putting value of `T` from (1)
`p-ma-mumg-3mumg=ma`
`P-4mumg`
`a=-2mug`.....(2)
Case-II

`a=(P-3mumg)/(m)`.....(3)
According to `Q`
acceleration is same in both cases Hence equating the equation (2) `&` (3) `P=2mug`
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