Lect25-Phys172s10-(12.6-12.8-Entropy_Exam_3_review)

# Lect25-Phys172s10-(12.6-12.8-Entropy_Exam_3_review) - PHYS...

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Spring 2011 PHYS 172: Modern Mechanics Lecture 25 – Entropy Read 12.6 – 12.8 Exam 3 results : Multiple choice: 42.5/70 = 60.7% Handwritten: XXX FINAL EXAM: 1. Comprehensive 2. About 20-25 multiple choice questions only. If you have Final Exam conflict: 1. Notify us immediately ( before next Monday, Apr 25 ). Indicate your exam schedule for Thursday, Friday and Saturday . 2. Depending on your input, the makeup exam will be scheduled for Friday or Saturday. EXAM 3 REVIEW: hardest problems

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3 Exam 3: Hardest problem, 39% A rocket is at rest (not moving) in outer space far away from any massive objects, i.e. the external net force on the rocket is negligible. The rocket turns on its engine throwing out burning gases of rocket fuel to the left, while accelerating the right. Consider a system consisting of the rocket, fuel and burning gases, and describe the direction of motion of the center of mass of this system. 39% A) The center of mass will not move 12% B) The center of mass will accelerate to the right at the same rate as the rocket itself 44% C) The center of mass will accelerate to the right at rate that is smaller than that of rocket 3% D) The center of mass will accelerate to the left 1% E) The answer depends on the chemical energy released during burning , CM net ext dP F dt = ° ° What will be the velocity of the center of mass v cm ? LECTURE 16 clicker question : A system is initially at rest and consists of a man with a bottle sitting on ice (ignore friction). The man then throws the bottle away as shown. Exam 3: Hardest problem, 39% A rocket is at rest (not moving) in outer space far away from any massive objects, i.e. the external net force on the rocket is negligible. The rocket turns on its engine throwing out burning gases of rocket fuel to the left, while accelerating the right. Consider a system consisting of the rocket, fuel and burning gases, and describe the direction of motion of the center of mass of this system. 39% A) The center of mass will not move 12% B) The center of mass will accelerate to the right at the same rate as the rocket itself 44% C) The center of mass will accelerate to the right at rate that is smaller than that of rocket 3% D) The center of mass will accelerate to the left 1% E) The answer depends on the chemical energy released during burning , CM net ext dP F dt = ° °
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