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1997MT2s

# 1997MT2s - Physics 125 Test II This is a closed book exam...

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Physics 125 Test II October 23, 1997 This is a closed book exam. You have 70 minutes to do the exam. You may use a calculator. Some (possibly) useful equations r = x ˆ i + y ˆ j + z ˆ k x - x 0 = v 0 t + 1 2 at 2 a r = v 2 r x - x 0 = vt - 1 2 at 2 x = - b ± b 2 - 4 ac 2 a x - x 0 = 1 2 (v 0 + v)t v = v 0 + at v 2 = v 0 2 + 2 a(x - x 0 ) f K = K N U S = 1 2 kx 2 U G = mgy 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. Please remember to put your name on the test booklet and SIGN THE PLEDGE.

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Solutions 1. (20 points). Work Three forces are applied to a mass moving towards the left on a frictionless floor, as shown in the figure. The values of the forces are F1 = 5.00 N F2 = 9.00 N F3 = 13.00 N F3 is the gravitational force. The mass moves 3.00 meters to the left.
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