P221_2008_week10

P221_2008_week10 - P221 Exam 2 Histogram 1 2 3 4 5 6 7 20...

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Unformatted text preview: P221 Exam 2 Histogram 1 2 3 4 5 6 7 20 30 40 50 60 70 78 Bin Frequency Frequency AVERAGE: 53.6/78 = 68.7% Angular displacements are NOT 3-D vectors!! They don’t add commutatively! Rotational Inertia for Selected objects and rotation axes: HR&W Table 10-2 Chapter 10 problems Chapter 10 problems Chapter 10 problems • [time: Ball first (24 ); hoop (1) same (4): Speed ball (9) hoop (11) same (7); KE ball (7), hoop (15) same (8) ] • The ball arrives at h=0 before the hoop. The ball is moving faster just before reaching h=0. The ball has greater kinetic energy just before it reaches h=0 because it has a very very small potential energy whereas the energy of the hoop is split between potential and kinetic [not quite] • The ball is going to arrive first but they will both be moving at the same speed when they reach the floor. They will have the same kinetic energy when they reach the floor....
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P221_2008_week10 - P221 Exam 2 Histogram 1 2 3 4 5 6 7 20...

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