Q8_7B_W10_Rubric

Q8_7B_W10_Rubric - Name: Rubric Last , Solution First DL...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/08/2010 for the course PHY 7B PHY7B taught by Professor Cebra during the Winter '10 term at UC Davis.

Page1 / 2

Q8_7B_W10_Rubric - Name: Rubric Last , Solution First DL...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online