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NEET2018PhysicsRotational MotionActual

A solid sphere is rotating freely about its symmetric axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

Options

  1. ARotational kinetic energy
  2. BMoment of inertia
  3. CAngular velocity
  4. DAngular momentum

Correct answer

D. Angular momentum

Step-by-step solution

∵ τ e x t   = d L → d t So, when τ e x t   = 0 ⇒   d L → d t = 0 ⇒   L → = constant So angular momentum remains constant.

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