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Unformatted text preview: pokharel (yp624) HW02 Radin (56520) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The position of a car as a function of time is given by the values in table t (seconds) 1 2 3 4 5 s (feet) 10 14 30 36 56 Find the average velocity for the time period beginning when t = 3 and lasting 2 seconds. 1. average vel. = 11 feet/sec 2. average vel. = 14 feet/sec 3. average vel. = 10 feet/sec 4. average vel. = 13 feet/sec correct 5. average vel. = 12 feet/sec Explanation: Average velocity between times t = 3 and t = 3 + h is given by dist. travelled time taken = s (3 + h )- s (3) h . When h = 2, therefore, s (3 + 2)- s (3) 2 = s (5)- s (3) 2 = 56- 30 2 . Consequently, over the time interval from t = 3 to t = 5 the car has average velocity = 13 ft/sec . 002 10.0 points A car is driven at a constant speed. Sketch a graph of the position of the car as a function of time. 1. time position 2. time position 3. time position 4. time position pokharel (yp624) HW02 Radin (56520) 2 5. time position 6. time position correct Explanation: When the position of the car is plotted against time, the slope of the graph indicates the speed of the car, the greater the slope, the greater the speed, and the car is stationary when the slope is zero. Thus of the graphs,when the slope is zero....
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This note was uploaded on 06/05/2010 for the course PHYS 92515 taught by Professor Tsoi during the Spring '10 term at University of Texas at Austin.
- Spring '10