Quiz5_key

# Quiz5_key - A B 36.87 ° μ k = 0.15 k = 0.36 T = 27.4 N R...

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PHYS 2305 CHANG: Quiz 5, Spring 2009 Name (print)___________________ KEY ____________________________ I have neither given nor received any unauthorized aid on this quiz. Pledge ______________________________________________ Instructions : Show your work to receive credit , and present your answers with 3 significant figures and proper units . 1. The small metal sphere with mass 10 Kg is attached to two cords and spins horizontally around the vertical rod as shown. If the tension in the upper cord is three times as much as that in the lower one, find the period of the sphere’s motion. 0.5 m 30˚ 60˚ T = ___________ 1.34 s ___________ 2. Blocks A ( m A = 5 Kg) and B ( m B = 10 Kg) are connected by a cable as shown. Knowing that μ k = 0.15 between block B and the ramp and μ k = 0.36 between block A and the tabletop, find the tension in the cable.
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Unformatted text preview: A B 36.87 ° μ k = 0.15 k = 0.36 T = ___________ 27.4 N ___________ R 3. A small button placed on a spinning platform moves with the platform without slipping, and the coefficient of static friction is μ s = 0.4 between the button and the platform. If the frequency of the platform’s rotation is 0.5 rev/s, find the maximum distance R from the center that will prevent the button from sliding outward. R = _______ 0.397 m ________ 4. A small block is placed inside the spinning cone at a distance L = 0.3 m as shown. If μ s = 0.4 between the block and the surface and θ = 36.87˚, find the maximum rotating frequency f of the cone that will keep the block from slipping. Use cos36.87° = 0.8 and sin36.87° = 0.6. θ f L μ s Max f = _______ 1.30 rev/s __________...
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