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Unformatted text preview: Midterm Exam, October 15, 2007 NAME: Units must be included in final answers, where appropriate. Note on constants: Magnitude of gravitational acceleration = g = 9.8 m/s 2 Problem 1 A rock is thrown from a bridge at an upward launch angle of 30 with an initial speed of 24 m/s. The bridge is 30 m above the river. a.) What is the maximum height above the bridge reached by the rock? b.) Once the rock is released, how much time elapses before the rock reaches its maximum height? c.) Once the rock is released, how much time elapses before the rock hits the water? Problem 2 F 2 F 1 y x A block weighing 12 N begins to move along the floor at time t = 0, when forces F 1 and F 2 are applied to the block. An overhead view of the applied forces on the block is shown in the above figure. Both forces have the same magnitude of F 1 = F 2 = 6 N , while F 1 is directed along the x-axis, and F 2 is directed along the negative y-axis. The coefficient of kinetic friction for the block and the floor is...
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- Spring '08