Quiz11_key

# Quiz11_key - m = 10 Kg is attached to a cable that wraps...

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PHYS 2305 CHANG: Quiz 11, 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 . O L = 1.5 m 1.2 m 1. A 6 Kg slender rod of length 1.5 m is mounted on a disk as shown. The 10 Kg disk has a radius of 0.6 m and the assembly is pivoted at point O . Find the moment of inertia of the assembly about O . I = ________ 7.74 Kgm 2 __________ F 2 = 250 N F 1 = 600 N 30˚ 0.5 m 2 m O 2. Two forces are applied as shown to the 12 Kg slender rod that is pivoted at point O . The rod rotates in the horizontal plane, so gravity has no effect on the motion. Find the angular acceleration of the rod at the position shown. Also indicate the direction of the angular acceleration. α = _____ 21.8 rad/s 2 CW __________ 3. A block of mass
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Unformatted text preview: m = 10 Kg is attached to a cable that wraps around the pulley as shown. The pulley is pivoted at the center, and the angle of incline is θ = 30°. The radius of the pulley is R = 0.5 m and its moment of inertia is I = 0.4 Kgm 2 . The block is released from rest and slides down the ramp, and the coefficient of friction is μ k = 0.2 between the block and the ramp. θ k (a) Find the acceleration of the block. a = ________ 2.76 m/s 2 __________ (b) Find the tension in the cable. T = ________ 4.42 N __________ 4. A 20 Kg slender rod pivoted at its center has a length of 6 m. A motor applied a torque of 2400 Nm on the rod to turn it from rest. (a) Find the average power by the motor when the rod rotates an angle of 500 rad. _______ 240 kW _________ (b) Find the instantaneous power of the motor at the moment that the rod rotates an angle of 500 rad. _______ 480 kW __________...
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