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problem_12 - shin(ys5232 Homework 12(Section 3.8...

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shin (ys5232) – Homework 12 (Section 3.8) – miner – (55096) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A rock is thrown into a still pond and causes a circular ripple. If the radius of the ripple is increasing at a rate of 6 ft/sec, at what speed is the area of the ripple increasing when its radius is 2 feet? 1. speed = 25 π sq. ft/sec 2. speed = 26 π sq. ft/sec 3. speed = 23 sq. ft/sec 4. speed = 27 sq. ft/sec 5. speed = 24 sq. ft/sec 6. speed = 23 π sq. ft/sec 7. speed = 26 sq. ft/sec 8. speed = 24 π sq. ft/sec 002 10.0 points A point is moving on the graph of xy = 2. When the point is at (2 , 1), its x -coordinate is increasing at a rate of 6 units per second. What is the speed of the y -coordinate at that moment and in which direction is it mov- ing? 1. speed = - 5 units/sec, increasing y 2. speed = 5 units/sec, increasing y 3. speed = 3 units/sec, decreasing y 4. speed = - 3 units/sec, decreasing y 5. speed = 4 units/sec, increasing y 6. speed = -
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