南华物理演习第02章谜底(国外英文资料).docVIP

南华物理练习第02章答案(国外英文资料) The conservation and conservation laws of the movement Practice a One. Choice question In the case of the center of mass, you think the right thing to do is (C). (A) the center of mass and gravity always coincide; (B) the center of mass of any object is inside the object; (C) the object must have a center of mass, but not necessarily the center of gravity; (D) the center of mass is the center of mass, and the center of mass must have a mass distribution. Any of the mass points is determined by the motion of the center of mass. (A) the internal forces and external forces of the system; (B) the external force of the system; (C) the internal force and initial conditions of the particle system; (D) the external forces and initial conditions of the system. The distance between the center of the two disks is exactly the same as a small disk with radius R from a uniformly distributed radius. If the center of the disc is centered in the center of the disk, the coordinates of the center of mass center should be (B). (A); (B); (C); (D. 4. The quality of 10 kg object, beginning at a rate of 2 m/s, due to external force, after a period of time the speed to 6 m/s, direction and turn 90 degrees, the objects in this period of time by the impulse of size (B) (A); (B); (C); (D). 2, fill in the blanks 1. There is a man-made earth satellite, quality as the m, the surface of the planet over 2 times the height of the earths radius R along the circular orbit, with m, R, and the quality of the earths gravitational constant G m, according to the size of satellite momentum. 2. Three quality equal to the boat on the surface of the lake in a horizontal follow one after another, the speed is equal to, if in the middle on the boat at the speed relative to the earth at the same time two quality are all objects to the two ship, before and after the set speed and direction in a straight line, ask the boat velocity before and after the thrown objects among what changes: size r