ef152-rec-1-4 - EF 152 Physics for Engineers Spring, 2009...

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EF 152 – Physics for Engineers Spring, 2009 Recitation 1.4 Angular Energy and Momentum Task 1. Wow, only three concept questions. Bennett and Schleter are getting soft in their old age. A force is applied to a dumbbell for a certain period of time, first as in (a) and then as in (b). 1. In which case does the dumbbell acquire the greater center-of-mass speed? a. case (a) b. case (b) c. no difference d. It depends on the rotational inertia of the dumbbell 2. In which case does the dumbbell acquire the greater rotational speed? a. case (a) b. case (b) c. no difference d. It depends on the rotational inertia of the dumbbell 3. In which case does the dumbbell acquire the greater energy? a. case (a) b. case (b) c. no difference d. It depends on the rotational inertia of the dumbbell Follow-up question: If there was a difference, where did the additional kinetic energy come from? Task 2. Rotating platform 1. Conservation of momentum. Sit on the rotating platform, and have a person start you in motion. a.
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ef152-rec-1-4 - EF 152 Physics for Engineers Spring, 2009...

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