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1998MT4s - Physics 125 Test IV December 8 1998 This is a...

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Physics 125 Test IV December 8, 1998 This is a closed book exam. You have 70 minutes to do the exam. You may use a calculator. Where appropriate, draw neat diagrams, labeling your axes and clearly indicating what variables you are using. Use Cartesian coordinates. Give solutions to 2 or 3 significant figures. Grading is based on what appears on your paper. In general, the answer to a problem by itself is not sufficient to obtain credit. The grader should be able to determine, without guessing, the steps you took to arrive at a solution. REGRADES can go either way. That is, errors made in grading do not always reduce your grade; they might have incorrectly increased your grade. (Most requests for regrades yield no change. Usually the student just did not understand how the grade was arrived at.) If more than one answer is given only one can be graded. Please indicate clearly which one you want to be graded. Please remember to put your name on the test booklet and SIGN THE PLEDGE.
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1. (25 points) Simple Harmonic Motion An oscillator consists of a block of mass M = 0.80 kg connected to a spring. At some time t, the position (measured from the unstretched length of the spring) is x = 20.0 cm, the velocity is –15.0 m/s and the force exerted on the mass by the spring is F = - 50.0 N. Find a). (5 points) The spring constant k.
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