课程名称︰普通物理甲上 课程性质︰大一共同必修 课程教师︰黄晖理 开课学院：生农学院 开课系所︰生物产业机电工程学系 考试日期（年月日）︰2008/10/29 考试时限（分钟）：50分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.A 300g block is dropped onto a relaxed vertical spring that has a spring constant of k=50.0N/cm.The block becomes attached to the spring and compresses the spring 20 cm before momentarily stopping.While the spring is being compressed,what work is done on the block by (a) the gravitational force on it and (b) the spring force? (c)What is the speed of the block just before it hits the spring? (Assume that friction is negligible) (d)If the sprrd at impact is doubled,what is the maximum compression of the spring? 2.A 80kg skier starts from rest at height H=30m above the end of a ski-jump ramp and leaves the ramp is frictionless. (a)What is the maximum height h of his jump above the end of the ramp? (b)If he increased his weight by putting on a backpack,would h then be greater,less,or the same? 3.Consider a rocket that is in deep space and at rest relative to an inertial reference frame.The rocket's engine is to be fired for a certain interval. What must be the rocket's mass ratio (ratio of initial to final mass) over that interval if the rocket's final speed relative to the inertial frame is to be 1.5 times the exhaust speed (speed of the exhaust products relative to the rocket). --

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