HW02-solutions

# HW02-solutions - vasquez (mpv244) – HW02 – Schultz –...

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Unformatted text preview: vasquez (mpv244) – HW02 – Schultz – (56445) 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) 13 17 33 47 59 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. = 15 feet/sec 4. average vel. = 12 feet/sec 5. average vel. = 13 feet/sec correct 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 = 59- 33 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 first speeds up, but then slows down. Sketch a graph of the position of the car as a function of time. 1. time position 2. time position 3. time position correct 4. time position vasquez (mpv244) – HW02 – Schultz – (56445) 2 5. time position 6. time position 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 04/18/2009 for the course CH 52375 taught by Professor Ruth during the Spring '09 term at University of Texas.

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HW02-solutions - vasquez (mpv244) – HW02 – Schultz –...

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