# exam01_sol_f09 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY...

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MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department 8.01 Physics I Fall Term 2009 Exam 1 Name Section Table and Group Answers without work shown will not be given any credit. Comments on how you are approaching the problem and what you are doing at any given point will be helpful to the grader in awarding partial credit, as will carefully drawn free body diagrams when appropriate. Problem 1 (20 points) Problem 2 (30 points) Problem 3 (30 points) Problem 4 (20 points) Total (100 points) 1

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Problem 1a (5 points) X x ± ² ³ ´ µ The graph above represents the y-component of the velocity of an object as a function of time. Which of the following could be a reasonable description of its motion? 1. The object accelerates upward at a constant rate and then accelerates downward until it hits the ground at t = 6 s. 2. The object accelerates upward at a constant rate and then accelerates downward until it reaches it highest point at t = 6 s. 3. The object accelerates upward at a non-constant rate and then accelerates downward until it hits the ground at t = 6 s. 4. The object accelerates upward at a non-constant rate and then accelerates downward until it reaches it highest point at t = 6 s. 5. None of the above. Answer 4 Inspection of the graph indicates that In the ﬁrst interval dv/dt a is not constant. This excludes 1) and 2). The area under the velocity verses time graph is positive and non-zero. Thus there is a positive total displacement which excludes 1) and 3). The velocity goes to zero at the end of the second interval. At that point the displace- ment has stopped changing. This is consistent with 2) and 4). 2
Problem 1b (5 points) X x X ± x ± Two blocks 1 and 2, on a frictionless table, are pushed from the left by a horizontal force ~ F 1 , and on the right by a horizontal force ~ F 2 as shown above. The magnitudes of the pushing forces satisfy the inequality | ~ F 1 | > | ~ F 2 | . Which of the following statements is true about the magnitude N of the contact force between the two blocks? 1.

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## This note was uploaded on 10/15/2011 for the course PHYSICS 0207239 taught by Professor Mamar during the Spring '09 term at Jordan University of Science & Tech.

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exam01_sol_f09 - MASSACHUSETTS INSTITUTE OF TECHNOLOGY...

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