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GR8677 #76
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Alternate Solutions |
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Comments |
ben 2006-07-19 16:23:40 | also, units rule out choices (C), (D), and (E). only (A) and (B) have units of angular momentum
jmason86 2009-08-10 20:34:14 |
Totally agreed. I did this.. but they were really mean in giving you a factor of 2 to distinguish the last choice. Damn ETS. Isn't that the first rule of real physics: Factors of 2 don't matter
haha
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|  | Andresito 2006-03-19 10:39:52 | This solution is confusing. Please specify why the factor of (1/2) disappears when you equate the translational energy with the potential energy.
Thank you
ben 2006-07-20 17:16:01 |
v=R*omega so the translational kinetic energy is equal to the rotational kinetic energy, and that value is (1/2)*M*R^2*omega^2. so when you add 1/2 plus 1/2 you get 1 making the total kinetic energy M*R^2*omega^2. nothing "disappears" here.
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