A fly revolves at the edge of a turntable. How would angular momentum and speed change if it landed half way to the centre of a turntable?
A)Angular momentum would double and speed would double.
B)Angular momentum would stay the same and speed would reduce to 1/2.
C)Angular momentum would stay the same and speed would double.
D)Angular momentum would decrease and speed would reduce to 1/2.

Question

Quizplus · Accepted Answer

Angular momentum is conserved in the absence of external torques. When the fly moves to a point halfway to the center, its moment of inertia decreases, but to conserve angular momentum, its speed decreases, since angular momentum (L) is the product of moment of inertia (I) and angular velocity (ω), and L = Iω remains constant.

A Fly Revolves at the Edge of a Turntable