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# sa4 - PH 1110 A Term 2007 Exam 4 prep Name Section Number...

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1 PH 1110 A Term 2007 Exam 4 prep. Name ___________________________ Section Number ______ 1a. If three forces are acting on the stick that you used in Lab 8, and two forces and their position vectors are known and given below, find the third force acting on the stick, which is in equilibrium. The coordinate system is shown on the sketch for part c), with the +k vector pointing out of the plane of the paper. The first two forces and their position vectors are: F 1 = ( - 1.00 i + 1.00 j ) N r 1 = 10.00 i cm F 2 = (+ 0.00 i - 2.00 j ) N r 2 = 5.00 i cm F 3 = 1b. Find the torque that third force exerts upon the stick. τ 3 = 1c. Sketch the three force vectors on this diagram in their correct positions. Each tick mark below represents one centimeter. i j

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2 PH 1110 A Term 2007 Exam 4 prep. Name ___________________________ Section Number ______ 2. A pulley is fixed to a wall. It has a rope over it. Each side of the rope has a different tension on it, yet the rope does not slip on the pulley. The +k vector points out of the page. 2a. Given that the tensions acting on the pulley have magnitude T 1 = 9.00 N, T 2 = 8.00 N, and r = 100 cm, what is the torque acting on the pulley?
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sa4 - PH 1110 A Term 2007 Exam 4 prep Name Section Number...

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