大学物理(西南交大)功课参考谜底2(国外英文资料).docVIP

大学物理(西南交大)作业参考答案2(国外英文资料) NO. 2 momentum and energy Class names and grades A, choose 1. Quality for m particle, in constant velocity v along the figure is the level of the triangle ABC smooth orbit. Particle across A Angle, orbital impulse acting on that particle size of [C] (A) mv. (C) mv. 2. At a certain speed on level ice eastward camion, southeast (oblique) upward direction to launch a shell, and artillery for sports, this system in the process (ignoring the surface friction and air resistance) [C] (A) the total momentum is conserved. (B) the total momentum is conserved in the direction of the front of the gun, and the momentum in the other direction is not conserved. (C) the total momentum is conserved in any direction on the horizontal plane, and the vertical component is not conserved. (D) the total momentum is not conserved in any direction. The variable force = 12t (SI) is applied to the mass m = 2kg, which causes the object to begin motion from the point of motion, and its momentum at the end of three seconds should be: [B] (A) -54kg, m/s; (B) 54kg, m/s; (C) -27kg/s; (D) 27kg/s; 4. A mass of M slope was still in horizontal smooth plane, will be A quality for M block gently put on the inclined plane, as shown in figure. If after that wood can rest on the slope, slope will be [A] (A) keep still. (B) accelerate to the right. (C) move to the right. The concept of work has the following words: (1) when conservative forces are doing positive work, the corresponding potential energy increases in the system. (2) the mass point motion is a closed path, and the work done by the conservative force on the particle is zero. (3) the force and the reaction force are equal and opposite, so the algebra of both work is zero. In the above statement: [C] (A) (1) (1), (2), (B) (B) (2), (3) is correct. (C) only (2) is right. (D) only (3) is correct. 6. Quality for m particles under the action of external force, the equations of motion for type A, B, w are positive constants. T