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

Consider a roller coaster with a circular loop. A roller coaster car starts from the top of a hill which is 5 M higher t...The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This ind...A particle moves in a potential region given by U = 8x2 - 4x + 400 J. Its state of equilibrium will be -...A refrigerator works between 4oC and 30oC. It is required to remove 600 calories of heat every second inorder to keep th...The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no....