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Unformatted text preview: to go from rest to a spin rate of 2400rpm in the 0.200s it takes to snap their wrist. Physics 4A THIRD EXAM Chapters 1 - 11 Fall 2004 2 3. A basketball player cannot balance a basketball on her fingertip unless the ball is spinning. Explain this in terms of the relevant principles of physics. 4. A 7.00g quarter (25 coin) has a radius of 1.20cm dropped into the slot of a vending machine rolls down a curved ramp 30.0cm high without slipping. At the bottom of the ramp find (a)the speed of its center of mass of the coin and (b)its angular speed about the center of mass. Physics 4A THIRD EXAM Chapters 1 - 11 Fall 2004 3 5. The A end of bar AB rests on a frictionless horizontal surface while the B end is hinged. A horizontal 120N force is exerted on the A end. This force is so large that the weight of the bar can be ignored. Find (a)the horizontal component of the force exerted by the pivot and (b)the vertical component of the force exerted by the pivot....
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This note was uploaded on 03/11/2012 for the course PHYSICS 204A taught by Professor Kagan during the Fall '09 term at CSU Chico.
- Fall '09