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HW07-problems-1

# HW07-problems-1 - white(taw933 HW07 ben-zvi(55600 This...

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white (taw933) – HW07 – ben-zvi – (55600) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of2)10.0points It took Anna from noon until 3 p.m. to drive from UT to her home 90 miles from Austin. After t hours of driving her distance from Austin was given in miles by s ( t ) = 30 t 2 - 20 3 t 3 . (i) What was her average speed for the trip home? 1. average speed = 29 mph 2. average speed = 30 mph 3. average speed = 31 mph 4. average speed = 32 mph 5. average speed = 28 mph 002(part2of2)10.0points (ii) Her instantaneous speed twice coincided with her average speed. At what time did it first happen? 1. at 12:37 pm 2. at 12:47 pm 3. at 12:42 pm 4. at 2:21 pm 5. at 2:31 pm 003 10.0points A storm system is in the Central Texas area and moving in a straight line through Austin. The Weather Service Office forecasts that t hours after 12noon the the storm will be a distance of s ( t ) = 24 + 2 t - t 2 miles from Austin. How fast will the storm be moving at 4:00 pm and in what direction will it be moving? 1. storm speed = 8 mph, storm moving towards Austin. 2. storm speed = 6 mph, storm moving away from Austin.

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