rupinder midterm 1-C 2011 solns

# rupinder midterm 1-C 2011 solns - 1 In the below figure the...

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1. In the below figure the 85 kg Rupinder is dragging a 150 kg crate of telescopes up a ramp of θ =28°. Notice that the rope he is pulling on is elevated α =17° above the plane of the incline. The crate on the ramp has a coefficient of static friction of 0.34 and a coefficient of kinetic friction of 0.23. Starting from rest it takes 3.3 s to get it moving at 0.56 m/s. (a) Draw the free body diagram, apply Newton’s 2 nd law and solve for the force Rupinder is pulling with? (b) Near the top of the incline Rupinder stops to take a break but continues to hold the rope at the same angle. What is the minimum force Rupinder can apply to keep the box from sliding down the incline?

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2. A snowmobile is moving across frictionless snow at 15.5 m/s and suddenly hits a 17.0-m-long track of rough snow. The snowmobile slows steadily over the rough patch, and then continues on at 7.70 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. For most of the 20

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rupinder midterm 1-C 2011 solns - 1 In the below figure the...

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