Unformatted text preview: University of Minnesota Names: School of Physics and Astronomy Physics 1301, Section 200, Fall 2008 Hour Exam 2: Group Problem (Thursday, October 9, 2008) You have taken a summer job at a warehouse and have designed a method to help get heavy packages up a ramp inclined at 15° to the horizontal. In your system, a package is attached to a rope that runs parallel to the ramp and over a pulley at the top of the ramp. After passing over the pulley, the other end of the rope is attached to a weight, which hangs straight down. In your system, the mass of this weight is adjusted to be twice the mass of the package. Your boss is worried about this pulley system. In particular, she is concerned that the package will be too difficult to handle at the top of the ramp. She tells you to calculate the acceleration of the package at the top of the ramp. To determine the influence of friction between the package and the ramp, you do some tests. You find that you can push a 50 kg package at a constant speed along a level floor made of the same material as the ramp with a horizontal force of 250 N. (a) What is the coefficient of kinetic friction between the package and the floor? (5 points) (b) Draw a free‐body force diagram for the package on the ramp. Represent all forces as arrows. Label the forces. (5 points) (c) Assume that the rope and the pulley have negligible mass. What is the tension in the rope when the package is moving up the ramp? (10 points) (d) What is the acceleration of the package at the top of the ramp? (5 points) ...
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This note was uploaded on 10/07/2009 for the course PHYS 1301W taught by Professor Marshak during the Fall '08 term at Minnesota.
- Fall '08