When a spinning ice skater pulls in his arms, he spins faster because
A. his angular momentum must be conserved, so reducing his radius must increase his speed of rotation.
B. there is less friction with the air.
C. there is less friction with the ice.
D. there exists an unbalanced reaction force.
Answer:A
When a spinning ice skater pulls in his arms, he spins faster because
A. his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B. there is less friction with the air. C. there is less friction with the ice. D. there exists an unbalanced reaction force.