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final1withanswerkey - Physics 1A Winter 2009 Makeup Final...

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Physics 1A Winter 2009: Makeup Final Version A 1 03.03.08 Closed book. No work needs to be shown for multiple-choice questions. 1 . A wheel initially has an angular velocity of 40 rad/s but it is slowing at a rate of 2.0 rad/s 2 until it comes to a stop. By the time it stops it will have turned through: (a) 80 rad. (b) 160 rad. (c) 200 rad. (d) 300 rad. -> (e) 400 rad. 2 . What centripetal acceleration does an 40 kg person experience when seated 16 m from the center of a merry-go-round whose angular speed is 0.50 rad/s? (a) 20 m/s 2 . (b) 10 m/s 2 . -> (c) 5 m/s 2 . (d) 30 m/s 2 . (e) 0.1 m/s 2 . 3 . Three identical massless rods are each acted on by two or more forces, all perpendicular to the rods and all equal in magnitude (with a force of magnitude F ). As you learned in Quiz 5, none of these rods is in static equilibrium. Now imagine that you can eliminate one of the fources on each rod. Which of the rods can be brought into static equilibrium? Choose one of the following statements below. 4 . Mitch throws a 100 g lump of clay at a 500 g target, which is at rest on a horizontal surface. After impact, the target, including the attached clay, slides 2.1 m before stopping. If the rod 1 rod 2 rod 3 F F F F F F F F

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Physics 1A Winter 2009: Makeup Final
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