Question

72. A circular disc is rotating about its natural axis
with angular velocity of 10 rads!. A second
disc of same mass is joined to it coaxially. If
the radius of disc is half of the radius of the
first, then they together rotate with an angular
velocity of
1) 2.5 rads-1
2) 5 rads-1
3) 8 rads-1
4) 6 rads-1​

Answer 1

circular disc is rotating about its natural axis

with angular velocity of 10 rads!. A second

disc of same mass is joined to it coaxially. If

the radius of disc is half of the radius of the

first, then they together rotate with an angular

velocity of

1) 2.5 rads-1

2) 5 rads-1

3) 8 rads-1

4) 6 rads-1​