Quiz3b - 30.0 m diameter that turns at a constant angular...

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Physics 53 Quiz 3b Fall 2007 Name ___________________________ Recit. Section _______ Circle the correct answer: 1. [2 points] Two identical objects are moved to the top of a tower from the ground. The first object is lifted up vertically by a crane; the second object is pulled up along an incline. On which object does gravity do more work? a) Object 1. b) Object 2. c) The work done by gravity is the same for both objects. 2. [3 points] A 2.00 kg block is sliding over a horizontal surface with kinetic friction coefficient μ k = 0.100. It travels a distance of 2.00 m before it comes to rest. What was its initial kinetic energy? [Use g = 10.0 m/s 2 ] a) 2.00 J b) 4.00 J c) 6.00 J d) 8.00 J 3. [3 points] A 60.0 kg person sits in the cabin of a Ferris wheel with
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Unformatted text preview: 30.0 m diameter that turns at a constant angular velocity once every 10 minutes. What is the total work done on the person between the lowest and the highest point she reaches during one revolution of the wheel? [Use g = 10.0 m/s 2 ] a) 18 kJ. b) 36 kJ. c) No work is done. 4. [2 points] The maximal angular velocity of a centrifuge is determined by the maximal centripetal force its walls can generate. If two otherwise identical centrifuges differ by a factor four in diameter, the larger centrifuge can be operated with a maximal safe angular velocity that is: a) The same as for the smaller one. b) Half as large as for the smaller one. c) Twice as large as for the smaller one....
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