A gymnast takes turns with her arms legs stretched. When she pulls her arms legs in

Question

A gymnast takes turns with her arms legs stretched. When she pulls her arms legs in (A) the angular velocity decreases (B) the moment of inertia decreases (C) the angular velocity stays constant (D) the angular momentum increases

Tardigrade Admin · Accepted Answer

Since no external torque act on gymnast, so angular momentum (L= I ω ) is conserved. After pulling her arms legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.

Q. A gymnast takes turns with her arms & legs stretched. When she pulls her arms & legs in

the angular velocity decreases

the moment of inertia decreases

the angular velocity stays constant

the angular momentum increases

Since no external torque act on gymnast, so angular momentum (L= I $ω$ ) is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.

Q. A gymnast takes turns with her arms & legs stretched. When she pulls her arms & legs in

the angular velocity decreases

the moment of inertia decreases

the angular velocity stays constant

the angular momentum increases

Since no external torque act on gymnast, so angular momentum (L= I ω ) is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.

Since no external torque act on gymnast, so angular momentum (L= I $ω$ ) is conserved. After pulling her arms & legs, the angular velocity increases but moment of inertia of gymnast, decreases in, such a way that angular momentum remains constant.