2009 Midterm with solutions

# 2009 Midterm with - PHYS 131 MIDTERM October 26th 2009 WITH SOLUTIONS-The exam comprises two parts 6 short-answer questions and 4 problems

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a) Draw the free-body diagram for each block after block 2 is dropped, but before it hits. b) Does block 1 hit the pulley before or after block 2 hits the wall? No calculations are necessary! Solution: (a) The free-body diagrams are: (b) Block 1 hits first. The tensions are equal, but in Block 2’s case, it acts at an angle. So the horizontal force (the only force that can make Block 2 move towards the wall) is smaller in Block 2’s case than for Block 1. Hence, Block 1 has the larger acceleration and will hit the pulley before Block 2 hits the wall. 3) [4 pts] The plot below shows the potential energy function U vs. x. Identify the numbered
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## This note was uploaded on 10/11/2011 for the course SCIENCE 131 taught by Professor Ragan during the Fall '08 term at McGill.

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2009 Midterm with - PHYS 131 MIDTERM October 26th 2009 WITH SOLUTIONS-The exam comprises two parts 6 short-answer questions and 4 problems

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