rupinder midterm 1-D 2011 solns

# rupinder midterm 1-D 2011 solns - 1 For most of the 20th...

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1. For most of the 20 th century the vinyl record was the main source of recorded music. You find your dad’s old 12 inch (30. cm) records that play on his record player at 33.3 rpm. After listening to one song from his Springsteen record you get bored and hit the off switch. You notice that it takes exactly 13.0 rotations to come to a complete stop. (a) What is the angular acceleration of the record as it comes to a stop? (b) How long does it take to come to a stop? (c) What is the total acceleration of a speck of dust half way to the edge of the record right after you hit the off switch?

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2. A snowmobile is moving across frictionless snow at 12.5 m/s and suddenly hits a 15.0-m-long track of rough snow. The snowmobile slows steadily over the rough patch, and then continues on at 6.70 m/s. (a) How long was it on the rough snow? (b) What is the coefficient of kinetic friction between it and the rough ice?
3. In the below figure the 85 kg Rupinder is dragging a 170 kg crate of telescopes up

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rupinder midterm 1-D 2011 solns - 1 For most of the 20th...

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