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1026 Notes

# 1026 Notes - Stone A(2 kg is sliding due east at 6.0 m/s...

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10/26/09 Oregon State University PH 201, Lecture #13 Stone A (2 kg) is sliding due east at 6.0 m/s across frictionless ice when it collides with stone B (3 kg), which is sliding due north at 3.0 m/s. The stones do not stick together. Immediately after the collision, stone A has a speed of zero. The speed of stone B is then: 1. 2.0 m/s. 2. 3.0 m/s. 3. 4.0 m/s. 4. 5.0 m/s. 5. None of the above. (Follow-up: In what direction is stone B moving?)

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10/26/09 Oregon State University PH 201, Lecture #13 The Inertia of Rotation: Is Mass the Whole Story? The mass of an object is the measure of its resistance to acceleration —that’s linear acceleration. What about angular acceleration? We know that an object resists changes in its angular motion (angular acceleration), too. And the more massive it is, the more it resists. Consider a baseball bat: The the more massive the bat, the harder it is to swing quickly at a pitch. So, should we de fi ne an angular momentum (call it L ) as the mass times the angular velocity? L = m ± ?
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