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Introductory Physics Homework Help
Conservation of Momentum and Relative Velocities
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[QUOTE="henry3369, post: 5003798, member: 538766"] [h2]Homework Statement [/h2] An 82-kg lumberjack stands at one end of a 380-kg floating log, as shown in the figure (Figure 1) . Both the log and the lumberjack are at rest initially. If the lumberjack now trots toward the other end of the log with a speed of 2.7 m/s relative to the log, what is the lumberjack's speed relative to the shore? Ignore friction between the log and the water. Express your answer using two significant figures. [h2]Homework Equations[/h2] Conservation of Momentum [h2]The Attempt at a Solution[/h2] m1v1' + m2v2' = 0 m1v1' = -m2v2' (82)(2.7) = (-380)(v2') v2' = -0.5826 velocity in respect to shore = 2.7 + (-0.5826) = 2.1 m/s For some reason this answer is incorrect. I also tried 2.7 + 0.5826 = 3.3 m/s, but that is wrong also. Is there something that I am doing incorrectly before this last step? [/QUOTE]
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Introductory Physics Homework Help
Conservation of Momentum and Relative Velocities
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