Exam 1 Solutions

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------------------------------- Exam 1
Discussion T A:
------------------------- 1
A. [6pts.} The drawing shows a triple jump on a checkerboard, starting at the center of
square A and ending on the center of square B. Each side ofa square measures 4.9 cm.
What is the magnitude ofthe displacement ofthe colored checker during the triple
jump?
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Physics 2010 Summer 2013 Richard Ingebretsen
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Discussion T A:
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Exam 1
A. [8 pIS'] A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 mis.
The car is initially a distance d away. The bear is 20 m behind the tourist and running at 6.0 m/s. The tourist
reaches the car safely. What is the maximum possible value for d?
B. A swimmer moves according to the velocity vs. time graph to the right. 2.0
1. [8 pIS'] Find the dis lac t magnitude and direction) of
the swimmer for each segment fthe trip (A,B,C,D) in mis.
(Four answers are expected) A.-." _ ,.__f ' 0
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2. [3 pts.] What is the total distance traveled?
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3. [2 pts.] What is the magnitude ofthe average velolity for the entire trip?
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4. [2 pIs'] What is the average speed for the entire trip?
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Ph~sics 20lH Summer 2013 Richard Ingebrctsen
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c. [10 pts.} A pellet n is fired straight downward from the edge of a cliff that is 15 m above the ground. The
pellet strikes the ground with a speed of24 mls. How far above the cliff edge would the pellet have gone had the
gun been fired straight upward?
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Physics 20 I 0 Summer 2013 Richard Ingebretsen
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Exam
4
1
Di scussion TA: ICt;tfoVl
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A. A rollerblader follows the path to the right. In section A he skates at a constant , " c
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speed of 2.0 mls for 30 mi n. In section B he skates at a constant speed of 3.0 mls stat
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for 15 min. In section C he skates at a constant speed of 2.0 m/s and travels fo r
6.0 km. He then decides he wants t go back to his car which is located where he
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started and skates directly toward it at a constant speed of 2.5 m/s.
A
)70
B.. ;:2.100 ""
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I. [ 7 piS.} What is the displacement of the skater from the start to the end of 1tl~ =0..,
seclion (rnagnitude and direction)? ~
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2. [2 pis.] How far does the student travel from the end of section C until he is back to where he stalted?
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!2pls.] What is the total distance traveled by the student (including the last skale at 2.5 m/s)?
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(.0...., r~ 4. [2 piS.} What is the average speed for the entire trip (from stalt to return to car)?
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