A man is spinning in the gravity $$free-space$$ changes the shape of the body by spreading his arms. By doing this he can change his (a) moment of $$inertia(b)$$ angular $$momentum(c)$$ angular $$velocity(d)$$ rotational kinetic energyWhich one of the following are correct?

Question

A man is spinning in the gravity $$free-space$$ changes the shape of the body by spreading his arms. By doing this he can change his (a) moment of $$inertia(b)$$ angular $$momentum(c)$$ angular $$velocity(d)$$ rotational kinetic energyWhich one of the following are correct?

Infinity Learn · Accepted Answer

Since net external torque on the man is zero, his angular momentum remains conserved.now Angular $$momentumL=$$ Iω $$=$$ ConstantWhen the man spreads out his hands, his moment of inertia I increases, hence ω decreases.Also rotation K.E $$=$$ $$L2$$ $$/$$ $$2$$ I, So if I increases, K.E decreases.Hence, option $$-$$ (3) is right.

A man is spinning in the gravity free-space changes the shape of the body by spreading his arms. By doing this he can change his
(a) moment of inertia
(b) angular momentum
(c) angular velocity
(d) rotational kinetic energy
Which one of the following are correct?

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

A man is spinning in the gravity free-space changes the shape of the body by spreading his arms. By doing this he can change his (a) moment of inertia(b) angular momentum(c) angular velocity(d) rotational kinetic energyWhich one of the following are correct?

Remember concepts with our Masterclasses.

Ready to Test Your Skills?

free study material

A man is spinning in the gravity free-space changes the shape of the body by spreading his arms. By doing this he can change his
(a) moment of inertia
(b) angular momentum
(c) angular velocity
(d) rotational kinetic energy
Which one of the following are correct?