MP21- Relative Motion

# MP21- Relative Motion - y direction Suppose it takes the...

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3/2/08 4:53 PM MasteringPhysics: Assignment Print View Page 1 of 1 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1114142 [ Print View ] PHYS 2211 ABCDE Spring 08 MP21: Relative Motion Due at 11:59pm on Thursday, February 14, 2008 View Grading Details Problem 6.13 A boat takes 3.30 to travel 25.0 down a river, then 5.90 to return. Part A How fast is the river flowing? ANSWER: 1.67 km/h Crossing a River A swimmer wants to cross a river, from point A to point B. The distance (from A to C) is 200 , the distance (from C to B) is 150 , and the speed of the current in the river is 5 . Suppose that the swimmer makes an angle of (0.785 ) with respect to the line from A to C, as indicated in the figure. Part A To swim directly from A to B, what speed , relative to the water, should the swimmer have? Part A.1 Use the motion in the
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Unformatted text preview: y direction Suppose it takes the swimmer a time to cross the river and arrive at B. Find an expression for the time by considering only (the y component of the swimmer's motion with respect to the shore). Answer in terms of , , and . ANSWER: = Answer not displayed Part A.2 Use the motion in the x direction Part not displayed Part A.3 Solve for Part not displayed Express the swimmer's speed numerically, to three significant figures, in units of kilometers per hour. ANSWER: = 4.04 Another way to do this problem, without using any kinematics, would be to add the swimmer's and river's velocities vectorially, and set the angle that this vector makes with AC or the river bank equal to that which AB makes with the same. Summary 2 of 2 items complete (100.38% avg. score) 2.01 of 2 points...
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