An astronaut in the space station initially has no angular momentum. She begins

Question

An astronaut in the space station initially has no angular momentum. She begins whirling her arms her around in a counterclockwise direction as seen from one side. If her whirling arms have a total angular momentum 9.00 kg·m²/s, and she weighs 55.0 kg, what is the angular momentum of the rest of her body while her arms whirl?

______________ counterclockwise OR clockwise

Assume there is no air resistance or contact with any other object while the astronaut whirls her arms. When she stops whirling her arms, her body

A) also stops rotating.

B) may or may not rotate depending on various factors.

C) reverses direction of rotation.

D) continues to rotate in the same direction at the same speed.

E) rotates faster in the same direction.

Explanation / Answer

1) 9 kg.m^2/s clockwsie

Initial angular momemtum = final angular momentum

0 = L_arms + L_body

0 = 9 kg.m^2/s + L_body

==> L_body = - 9 kg.m^2/s (negative sign indicates clockwise direction)

2) A) also stops rotating.

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