NEET | 2018Work, Power and EnergyHard

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: Work, Power and Energy·Practice all Work, Power and Energy questions

More Work, Power and Energy Questions

Sample pendulums P1 and P2 have lengths l1 = 80 cm and l2 = 100 cm respectively. The bobs are of masses m1 and m2. Initi...The potential energy of a particle of mass 1 kg in motion along the x-axis is given by : U = 4(1 - cos2x)J, where x is i...The stiffness constants of two springs A and B are KA and KB respectively (KA > KB). If same force is applied to both...Two-point charges of 1 nC and 2 nC are placed at the two corners of equilateral triangle of side 3 cm . The work done in...A ball moving with velocity of 9m/s collides with another similar stationary ball. After the collision both the balls mo...