Question

A disc of radius r is cut from a larger disc of radius 4r in such a way that the edge of the hole touches the edge of the disc. The centre of mass of the residual disc will be a distance from the large disc
1)r/5
2)r/4
3)r/3
4)r/2​

Answer 1

Answer:

option1

Explanation:

area of the residual disc=π(16r^2-r^2)

=15πr^2

then m1/m2=πr^2÷15πr^2

m1/m2=1/15

R1=3r,R2=?

m1r1=m2r2

=m1/m2=3r/15=r/5

Answer 2

Answer:

r/5 is the answer...

hope it helps