课程名称︰普通物理学甲上 课程性质︰必修 课程教师︰王名儒 开课学院：工学院 开课系所︰材料系 考试日期（年月日）︰101.11.8 考试时限（分钟）：120 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 ball is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of 45度. With what speed was it thrown ? 2. A block is suspended by a rope from the ceiling of a car. When the car rounds a 50-m radius horizontal curve at 20 m/s, what angle does the rod make with the vertical ? 3. Find the change of the kinetic energy of a particle moving under the force F(x,y) = x^2y i + xy^2 j along the curve y = x^2 from point (0,0) to (2,4). SI units are assumed. 4. Describe properties of the frictional force (for both static and kinetic). Draw a simple graph to show the relationship between the magnitude of the frictional force and the applied external force. 5. A uniform string having mass m is fixed on a frictionless table with half its total length, L/2. The other half is hung vertically outside this table. If this string is released freely at one moment, how long will it take for this string being fully out of the table ? 6. A 30 kg steel block is dropped from a height of 20 cm above a thin thin rod made of aluminum. The Young's modulus of aluminum is 70*10^9 N/m^2, the cross-sectional area of this rod is 1.0 cm^2 and the rod length is 10 cm. Find the maximum distance which the rod is compressed assuming the ground and the block are perfectly rigid. 7. A playground merry-go-round has a radius of 3.0 m and a rotational inertia of 600 kg m^2. It is initially spinning at 0.8 rad/s when a 20 kg child crawls from the center to the rim. When the child reaches the rim, the angular velocity of the merry-go-round becomes ? 8. Find the rotational energy of a disk with radius R and mass m rolling from the rest on a 45度 ramp for a distance L. 9. Find the gravitational force experienced by a particle (mass m) at a distance r from the center of a uniform spherical star with mass M and radius R. 10. A large tank with height H is filled with water. There are two small hole in the bottom, one with radius r and the other 2r. Find the speeds of water leaving the small hole and the large hole. --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.112.243.14 ※ t1016d:转录至看板 b04902xxx 10/26 20:56