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Q8_7B_W10_Rubric

# Q8_7B_W10_Rubric - Name Rubric Last Solution First DL...

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Name: Rubric , Solution DL Section: 00 Last First Office Use Quiz 8 Physics 7B Winter 2010 Mar. 03, 2010 Consider an Atwood machine that has two unequal masses ( m 1 = 10 kg and m 2 = 5 kg) a pulley with radius R = 10 cm and mass M = 10 kg, and a massless string that can not stretch. The moment of inertia of the pulley is I = ½ MR 2 . The bearing about which the pulley rotates is frictionless. a) The two masses are released, and because m 1 > m 2 , m 1 starts to descend, while m 2 rises, and the pulley wheel starts to rotate. After some period of time, m 1 has a downward speed of v = 1 m/s. What is the angular velocity of the pulley (magnitude and direction). = v/r = (1 m/s)/(0.1 m) = 10 rad/s (direction out of the page) Q (10.0) -- Calculated the correct magnitude and direction, with relevant work shown. Note that "to the left" was not an acceptable answer. R (8.0) -- Calculated the magnitude correctly, but direction was incorrect or not stated. S (5.0) -- Provided the correct direction, but the magnitude was incorrect or not calculated.

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