NEET | 2018Rotational MotionEasy

Question

Three objects, A : (a solid sphere), B : (a thin circular disk) and C = (a circular ring), each have the same  mass M and radius R. They all spin with the same angular speed ω about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation :-

Options

A.

WC > WB > WA

B.

WA > WB > WC

C.

WB > WA > WC

D.

WA > WC > WB

Solution

W = loss in KE = 12Iω2
IA = 25MR2 = 0.5MR2
IB = 12MR2 = 0.4 MR2
IC = MR2
∴ WC > WB > WA

Create a free account to view solution

View Solution Free
Topic: Rotational Motion·Practice all Rotational Motion questions

More Rotational Motion Questions

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along...A fly wheel originally at rest is to reach an angular velocity of 36 radian/s in 6 second. The total angle it turns thro...A circular plateform is free to rotates in a horizontal plane about a vertical axis passing through its centre. A tortoi...The moment of inertia of semicircular plate of radius R and mass M about axis AA′ in its plane passing through its...If the earth is a point mass of 6 × 1024 kg revolving around the sun at a distance of 1.5 × 108 km and in time...