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All the blocks shoen in the figure are a...


All the blocks shoen in the figure are at rest.The pulley is smooth and the strings are light. Coefficient of friction at all the contacts in 0.2 A frictional force of 10 N acts between A and B. The blocks A is about to slide on block B. The normal reaction and frictinal force exerted by the ground on the blocks B is.

A

The normal reaction exerted by the ground on the block B is 110 N

B

The normal reaction exerted by the ground on the block B is 50 N

C

The frictional force exerted by the ground on the block B is 20 N

D

The frictional force exerted by the ground on the block B is zero

Text Solution

Verified by Experts

The correct Answer is:
A, D

The frictional force on blocks A is
`impliesmuN_1=10impliesN_1=(10)/(0.2)=50N`
The net force on block B in vertical direction is zero
`N_1=50+N_1+10=110N`
`implies` Normal reaction exerted by ground on blocks B is 110 N.
The net force on block B in horizontal direction is zero.
`f+10-10=0`
`implies` frictional force exerted by ground on block B is zero
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