# Quiz_3_101807_answer - Physical Science 303 Name 1 Quiz#3...

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Physical Science 303 Quiz #3, Oct. 18 2007 Name : 1. On below graph, mark a dot 4cm West from O . Call this point A. Mark a dot 3cm South from point A . A person goes to A from O and goes to B from A. (10 pts) a) Draw a displacement vector OA and AB vector. (2pts) b) Draw his (her) final displacement vector. (2pts) c) Express the final displacement vector in rectangular coordinate. (3pts) ( -4cm , -3cm ) d) Express the final displacement vector in polar coordinate. (3pts) { 5cm , S 53 W } O W E S N

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2. An athlete swims 50 m length pool in 20 seconds, then takes an additional 22 seconds to return 50 m back to the starting position. (10 pts). (Answer in SI unit) a) In the first half of the swim, what is his average speed? (3pts) 50 m/ 20 s = 2.5 m/s b) In the second half of the swim, what is his average speed? (3pts) 50 m / 22 s = 2.27 m/s c) For the round trip, what is his average speed and velocity? (4pts) 100 m / 42 s = 2.38 m/s, velocity = 0 m/s 3. You are heading to Dallas from Austin on I-35. Your car is moving at 65mph to North. A
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## This note was uploaded on 04/29/2008 for the course PS 303 taught by Professor Modi during the Spring '08 term at University of Texas.

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Quiz_3_101807_answer - Physical Science 303 Name 1 Quiz#3...

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