PHY130_Practice Exam #2_2.pdf

PHY130_Practice Exam #2_2.pdf - Section 1 Section 2 Total...

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Prof. Mitchell PHY130 (Spring 2017) Exam #2 NAME: You have 50 minutes to answer the following questions. All questions that aren’t fully answered will still receive points for partial credit. Please sign below the following statement: TO THE BEST OF MY KNOWLEDGE I HAVE NOT CHEATED OR RECEIVED ANY HELP ON THIS EXAM : Section 1: __________ Section 2: __________ Total: __________ 48
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Part I. Multiple Choice (4 pts each) Instructions: Solve 6 of the following 9 problems. Please clearly circle one and only one answer for each of the following. Indicate which problems you would like graded, otherwise I will grade 1-6. Show all of your work. Partial credit may be given if you include your work. Questions: 1. At the Great Wolf Lodge waterpark there is a pipe that spins in a circle. As water fills the 1.5 m long-pipe, the water pressure causes the pipe to spin around its center. It takes 15 s for the pipe to spin from rest to its maximum speed, while it made 20 revolutions. What is the angular acceleration of the pipe as it spins up? (a) 1.1 rad/s 2 (b) 0.56 rad/s 2 (c) 0.18 rad/s 2 (d) 0.089 m/s 2 2. In your quest for the perfect room arrangement, you decide to move your desk from one side of the room to another. The 75 kg desk slides with constant velocity, and you push with a 100 N horizontal force. What is the coefficient of friction between the desk and the floor? (a) 0.75 (b) 0.14 (c) 0.10 (d) 0.20
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