If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly

If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly lower his hands, then

Options

(a) The angular velocity decreases
(b) His moment of inertia decreases
(c) The angular velocity stays constant
(d) The angular momentum increases

Correct Answer:

The angular momentum increases

Explanation:

A gymnast sitting on a rotating stool with his arms outstretched. Suddenly when he lower his hands his moment of inertia I decreases. Since his angular momentum Iω remains constant and I decreases, his angular velocity ω increases.

admin:

View Comments (1)

  • The angular momentum increases because it depends on radius.Here when he lowers his hand the radius increases.

Related Questions

  1. Zenor diode is used for
  2. Which of the following is an example of ideal black body?
  3. The difference in the variation of resistance with temperature in a metal
  4. In vacuum, to travel distance d, light takes time t and in medium to travel distance
  5. A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω