Exam-1-10

Exam-1-10 - LAST NAME: . First name and initial: DO NOT...

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DO NOT OPEN YOUR EXAM UNTIL TOLD Exam I, Phys 172, Spring 2009 EXAM # 10 1. Record your two-digit exam version number on scantron form in the field “Test/Quiz number”. Please do not omit leading zero. 2. Write your name in the top-right corner here and on the scantron form 3. Record your PUID number in the respective field on your scantron form Do not use other paper. Write on the back of this test if needed . The page with major equations is provided with this exam (in the back) Circle your answers here and on scantron form. At the end of the exam, you will return scantron form and this printout with circled answers to your TA. LAST NAME: ………………………. First name and initial:
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Problem 1 There are about 3.2 billion people in China. If they all simultaneously jump up, estimate the change in the speed of the Earth right after they leave the ground. Make reasonable assumptions if necessary. The mass of Earth is 6 × 10 24 kg. A) 10 -18 m/s B) 10 -10 m/s C) 10 -6 m/s D) 10 -14 m/s E) 10 -2 m/s Problems 2-3: 39-year-old Zhang Xinquan from Dehui city, Jilin province of China, was capable of pulling a 24,000 kg train 40 meters in 4 minutes with just his right ear. Assume that there was no friction, the tracks were horizontal, the train was initially at rest and that Zhang applied a constant force during the 4 minutes of pull. Problem 2
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Exam-1-10 - LAST NAME: . First name and initial: DO NOT...

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