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hw 2 - silva(jrs4378 Hw 02 gualdani(56455 This print-out...

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silva (jrs4378) – Hw 02 – gualdani – (56455) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A tank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. The values in the table t (min) 5 10 15 20 25 30 V (gal) 712 489 280 148 25 0 show the volume, V ( t ), of water remaining in the tank (in gallons) after t minutes. If P is the point (15 , V (15)) on the graph of V as a function of time t , find the slope of the secant line PQ when Q = (25 , V (25)). 1. slope = 13 . 2 2. slope = 51 3. slope = 25 . 5 correct 4. slope = 43 . 2 5. slope = 20 . 9 Explanation: When P = (15 , V (15)) , Q = (25 , V (25)) the slope of the secant line PQ is given by rise run = V (25) V (15) 25 15 . From the table of values, therefore, we see that slope = 25 280 25 15 = 25 . 5 . 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
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silva (jrs4378) – Hw 02 – gualdani – (56455) 2 5. time position correct 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, only time position has the given properties.
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