Question

If angular momentum of a rotating body about a fixed axis is increased by 10%, its rotational kinetic energy will be increased by 1. 5% 2. 10% 3. 20% 4. 21%

Answer 1

Answer:

The correct option is C i.e 20%

Explanation:

Given,

ΔL/L = 10%. . . . . . .(1)

The expression for the rotational kinetic energy in terms of angular momentum,

K = L²/2I. . . . . . .(2)

where, L = angular momentum,

I = moment of inertia

K = rotational kinetic energy

From equation (2),

ΔK/K  = 2(ΔL/L)     [ From (1) ]

ΔK/K = 2 × 10% = 20%

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Answer 2

Answer:

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