has passed through? a) 1 m/s b)9 ms )10 m/s d 18 m/s e) 100 m/s 11. A 60 kg figu
ID: 2033970 • Letter: H
Question
has passed through? a) 1 m/s b)9 ms )10 m/s d 18 m/s e) 100 m/s 11. A 60 kg figure skater rotates on the ice about her center of gravity (vertically) With her arms extended, her initial rotational speed is 0.25 rev/s. But when she draws in her arms, her rotational speed is 0.80 rev/s. Ignoring friction, find the ratio of her initial moment of inertia to her final moment of ineria (li/l a) 0.098 b) 0313 c) )3.2e)10.24 12. A spinning figure skater pulls his arms in as he rotates on the ice. As he pulls his armis in, what happens to his angular momentum I and rotational kinetic energy K,? a) L and K. both increase. b) L stays the same; K, increases. c) L increases; K, stays the same. d) L and K both stay the same. 13. For round objects rolling on an incline, the faster objects are generally those with the a. greatest rotational incrtia compared with mass b. lowest rotational inertia compared with mass c. most streamlining MacBook Air 888F 2 3 4 5 6Explanation / Answer
11) (d) 3.2
Use conservation of angular momentum:
Linitial = Lfinal
Iinitial winitial = Ifinal wfinal
=> Iinitial/Ifinal = wfinal/winitial
= 0.80/0.25
= 3.2
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