ch4 problem45

Physics: Principles with Applications

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Chapter 4, Problem 45 Question Problem The forces acting on the bobsled are the force of gravity which points vertically downwards, the normal force perpendicular to the track, the frictional force parallel to the track surface, and the applied force . We know that and . We choose the x axis along the track surface, positive pointing down-slope. The components of in the x and y directions are Applying Newton s second law to the x direction, the acceleration in the x direction is directly proportional to the net force in that direction, and inversely proportional to the mass of the bobsled. So, http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=4pr45&id=489216 (1 of 2) [2/4/2008 4:05:37 PM]
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Unformatted text preview: http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=4pr45&id=489216 All the values needed above are known except the acceleration , which we need to calculate from the given data. The bobsled is at rest initially, so the initial velocity , the final velocity , and the distance . The equation relating the initial and final velocities and the distance traveled is Substitute the known values in the equation. Solve for . Substitute for , for , for , for , and 0.10 for in equation (1). Therefore, the required force is . http://www.hwproblems.com/cgi-bin/book.cgi?bookid=0044&cptn=4pr45&id=489216 (2 of 2) [2/4/2008 4:05:37 PM]...
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