Exam1solution.pdf;JSESSIONIDVISTA=hD0dMzlQqhhGGGv2CDrlWcmqpmZgyQj22xGLVL0M42crQ82pryjc!1022994572!

Exam1solution.pdf;JSESSIONIDVISTA=hD0dMzlQqhhGGGv2CDrlWcmqpmZgyQj22xGLVL0M42crQ82pryjc!1022994572!

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Unformatted text preview: Peoplesofi ID: PHYSI301-Cheung, Exam 1, September 23rd, 2008, Chapter 1 to 3. 80minutes . ' ’90" Name. I Single or Multiple choices (70%, 10 points each) B l {1 1.1116 wing of female mosquitOes beats 605 per second during its reproduction season. 1 Choose from the following option(s) that are true: (a) The wing beats 3.63x10s per minutes. (b) The wing beats 3.63xlil4 per minutes. (c) One beat converts to 15,194,433 cycles of oscillations for radiation from a cesium-133 to complete. (d) One beat converts to 5,194,433 cycles of oscillations for radiation fiom a cesium-133 to complete. (e) None of them above. (One second is defined to be the time it takes for radiation from a cesium-133 atom to A complete 9,192,631,770 cycles of oscillation.) 2. A thunderstorm drops half an inch (~0.01m) of rain on Washington DC, which covers an area of about 70 square miles (~108m2). What is the estimated number of raindrops that fell during the storm? [the diameter of a raindrop ' 4mm.] (a) 105 drops (b) 108 drops (c) 1011 drops (d 10l4 drops (e) 10” drops. PS 3. A person on horseback moves according to the velocity-time graph shown in the right. Choose from the following option(s) that are true about the displacement of the person for each segments of the motion. (a) Displacement in segment A is 10m. (b) Displacement in segment B is 25111. (c) Displacement in segment C is 30m. (d) Total displacement in segment A, B, and A C is 70m. (e) None Of them above. 0 5 10 15 20 25 B 0‘ Velocity, v (m/ 5) g; N F, V I . ' T1me,t (3) § 4. A Speeder domg 40.0rm/h (about 17.9m/s) W°m"'""“'““"" _ ‘ in a 25mi/h zone approaches a parked police car. The instant the Speeder passes the police car, M {77 K the police begin their pursuit. If the speeder maintains a constant velocity, and the police car 60 accelerates with a constant acceleration of 3.20m/sz, which of the following statements are true. VJQ (a) It takes 7.96s for the police car to catch the Speeder X (b) The police car traveled 200m in this time upon chase. (c) The Speeder traveled 143m in this time upon chase. (d) The velocity of the police car is 35.8m/S (e) None of them above. g l 1 5. A passenger walks from one side of a ferry to the other as it approaches a dock. Ifthe passenger’s velocity is 1.50mls due north relative to the ferry, and 45011115 at an angle of 30.0“| west of north relative to the water. Choose from the following Options about the direction and magnitudes of the ferry‘s velocity relative to the water that could be true. Academic Dishonesty: It is each student ’3 responsibility to read and understand the Academic Honesty Policy found in the Student Handbook of the University of Houston. Name: Peoplesofi ID: 9; V (a) The direction angle of the ferry’s velocity relative to the water is 43° east of north. (b) The direction angle of the ferry’s velocity relative to the water is 43° west of north. (c) The speed of the ferry’s velocity relative to the water is 3.29m/s. (d) The speed of the ferry’s velocity relative to the water is 32.911113. (e) None of them above. @6. You are riding in a boat whose speed relative to the water is 6.1 m/s. The boat points at an angle of 25° upstream on a river flowing at 4.5m/s. What is your velocity to the ground? (a) 5.6m/s pointing 12° upstream. (b) 5.6 m/s pointing 12° downstream. (c) 5.8 m/s pointing 19 ° upstream. (d) 5.8 m/s pointng 19 ° downstream. (e) None of them above. C/ 7. A car is traveling northwest at 9.0m/s. Four seconds later it has turned a corner and is now ' heading north at 15.0n1/s. What is the magnitude and direction of its average acceleration during those 4.0 seconds? (a) n.,.,=2.67n1/n2 (b) a..=1 .34111/52 (c) e=53.o° north of east (d) e=26.3° north of east (e) none of them above. II. Analysis (30%, 15 points each): [Provide important problem solving steps for partial credits] 1. Suppose 1.0 cubic meter of oil is spilled into the ocean. Find the area of the resulting slick, assuming that it is one molecule thick, and that each molecule occupies a cube 0.50pm on a side. newt) _ 3 ~ A :1, (.JW [MM ‘ o t\ l- : -fx f?— .:;LCK(OWL L 0.9mm (MO ""1 2. A doctor, preparing to give a patient an injection, squirts a small amount of liquid straight up from a syringe. If the liquid emerges with a speed of 1.5m/s, (a) how long does it take for it to return to the level of syringe? (b) What is the maximum height of the liquid above the syringe? = 20.5? 7 3.51%; :03” <9 (Q) We 15M 842 mo. ‘. Academic Dishonesty: It is each student is responsibility to read and understand the Academic Honesty Policyfiund in the Student Handbook of the University of Houston. ...
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This note was uploaded on 01/23/2011 for the course PHYS 1301 taught by Professor Ordonez during the Spring '09 term at University of Houston.

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Exam1solution.pdf;JSESSIONIDVISTA=hD0dMzlQqhhGGGv2CDrlWcmqpmZgyQj22xGLVL0M42crQ82pryjc!1022994572!

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