# exam1 with answers - Name: _ Class: _ Date: _ ID: A Exam1...

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 Exam1 Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Which expression is dimensionally consistent with an expression that would yield a value for time 1 ? ( v is velocity, x is distance, and t is time) a. v/x b. v 2 /x c. x/t d. v 2 t ____ 2. A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.) a. 3.47 m/s 2 b. 6.82 m/s 2 c. 11.4 m/s 2 d. 17.4 m/s 2 ____ 3. Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is: a. 4.0 cm. b. 9.8 cm. c. 16 cm. d. 20 cm. ____ 4. A ball rolls down an incline, starting from rest. If the total time it takes to reach the end of the incline is T, how much time has elapsed when it is halfway down the incline? a. 0.5 T b. < 0.5 T c. > 0.5 T d. More information is needed. ____ 5. Vector A ä is 3 m long and vector B ä is 4 m long. The length of the sum of the vectors must be: a. 5 m. b. 7 m. c. 12 m. d. some value from 1 m to 7 m. ____ 6. Jack pulls a sled across a level field by exerting a force of 110 N at an angle of 30 with the ground. What are the parallel and perpendicular components, respectively, of this force with respect to the ground? a. 64 N, 190 N b. 190 N, 64 N c. 95 N, 55 N d. 55 N, 95 N

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Name: ________________________ ID: A 2 ____ 7. The highest mountain on Mars is Olympus Mons, rising 22 000 meters above the Martian surface. If we were to throw an object horizontally off the mountain top, how long would it take to reach the surface? (Ignore atmospheric drag forces and use g Mars = 3.72 m/s 2 .) a. 1.8 minutes b. 2.4 minutes c. 3.0 minutes d. 0.79 minute ____ 8. A river flows due east at 3.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant velocity of 10 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore? a. 6 m b. 30 m c. 60 m d. 90 m ____ 9. (i) Estimate the number of times your heart beats in a month. (ii) Estimate the number of human heartbeats in an average lifetime. a. (i) 10 3 beats (ii)10 6 beats b. (i) 10 5 beats (ii)10 8 beats c. (i) 10 6 beats (ii)10 9 beats d. (i) 10 7 beats (ii)10 10 beats ____ 10. The base of a pyramid covers an area of 13.0 acres ( 1 acre = 43 560 ft 2 ) and has a height of 481 ft. If the volume of a pyramid is given by the expression V=bh/ 3, where b is the area of the base and h is the height, find the volume of this pyramid in cubic meters. a.
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## This note was uploaded on 10/05/2009 for the course PHY 1603 taught by Professor Boudreaux during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

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exam1 with answers - Name: _ Class: _ Date: _ ID: A Exam1...

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