课程名称︰普通物理学甲 课程性质︰ 课程教师︰黄晖理 开课学院：工 开课系所︰工海 考试日期（年月日）︰99/10/5 考试时限（分钟）：50 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1. A batter hit a pitched ball when the center of the ball is 1.5m above the ground. The ball leaves the bat ay an angle of 45° with the ground. With the launch, the ball should have a horizontal range of 110m. (a)Does the ball clear a 7m-high fence that is 98m horizontally from the launch point? (b)At the fence, what is the distance between the fence top and the ball center? 2. Three connected blocks are pulled to the right on a horizontal frictionless table by a force of magnitude T3 = 144.0 N. If m1 = 12.0 kg, m2 = 24.0 kg, and m3 = 36.0 kg, calculate (a) the magnitude of the system's acceleration, (b) the tension T1, and (c) the tension T2. ┌────┐ ┌────┐ │ │ ┌───┐ T1 │ │ T2 │ │ T3 │ m1 │------ │ m2 │----│ m3 │------- └───┘ └────┘ └────┘ 3. The two blocks ( m = 20kg and M = 80kg ) are not attached to each other. The coefficient of static friction between the blocks is μs=0.4,but the surface beneath the large block is frictionless. What is the minimun magnitude of the horizontal force F required to keep the smaller block from slipping down the large block? ┌──────┐ ┌──┤ │ ──→ │ m │ │ F │ │ │ └──┤ │ │ M │ │ │ │ │ ───┴──────┴── 4. The only force action on a4.0kg body as it moves alonge a positive x axis has x component Fx = -3xN, with x in meters. The velocity at x = 3.0m is 10m/s. (a)What is the velocity of the body at x = 5.0m? (b)At what positive value of x will the body have a velocity of 15m/s? --

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