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Unformatted text preview: schneiter (tcs639) HW04 Ross (89152) 1 This printout should have 10 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One pad dles directly upstream (and moves upstream), whereas the other paddles directly down stream. With downstream as the positive direction, an observer on shore determines the velocities of the two canoes to be 1 . 5 m / s and 2 . 7 m / s, respectively. What is the speed of the water relative to shore? Correct answer: 0 . 6 m / s. Explanation: Let v 1 s = velocity of canoe1 relative to shore, v 2 s = velocity of canoe2 relative to shore, v 1 w = velocity of canoe1 relative to water, v 2 w = velocity of canoe2 relative to water, and v ws = velocity of water relative to shore. Given : v 1 s = 1 . 5 m / s , v 2 s = 2 . 7 m / s , and v 1 w = v 2 w . v cs = v cw + v ws For the first canoe (moving upstream) v 1 s = v ws v 1 w For the second canoe (moving downstream) v 2 s = v ws + v 2 w adding these equations v 1 s + v 2 s = 2 v ws since v 1 w = v 2 w . Thus v ws = v 1 s + v 2 s 2 = 1 . 5 m / s + 2 . 7 m / s 2 = . 6 m / s . 002 (part 2 of 3) 10.0 points What is the speed of the first canoe relative to the water?...
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This note was uploaded on 04/23/2009 for the course PHYS 152 taught by Professor Button during the Spring '08 term at IUPUI.
 Spring '08
 BUTTON
 mechanics

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