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Questions  

A solid sphere of mass 10 kg is placed on a rough surface having coefficient of friction μ = 0.1. A constant force F = 7 N is applied along a line passing through the center of the sphere as shown in the figure. The value of frictional force on the sphere is

a
1 N
b
2 N
c
3 N
d
7 N

detailed solution

Correct option is B

Let f the be frictional force towards left for pure rolling.a=R×α where a=F−fm=7−f10----(1)α=τI=fRI=fR25mR2=5f2mR Hence, 7−f10=5fR20R   from(1) ⇒f=2NLimiting friction = fL=μmg=0.11010=10NSince, f

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