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题目:如下图所示,质量相同的实心铜球和实心铝球放在水平桌面上静止不动,则(____)A.铜球和铝球的重力势能相等。B.铜球的重力势能大于铝球的重力势能。C.铜球的重力势能小于铝球的重力势能。D.铜球和铝球的动能相等。有人根据物体的位置越高、质量越大,它的重力势能就越大的理论,认为铜球与铝球的质量相等。铝球重心比铜球重心的高,故铜球的重力势能小于铝球的重力势能,选择 A、D 比较合适。
Topic: As shown in the figure below, solid brass balls and solid aluminum balls of the same quality are kept stationary on a horizontal tabletop. (____) A. The gravitational potential energy of the copper ball and the aluminum ball is equal. B. The gravitational potential energy of the copper ball is greater than the gravitational potential energy of the aluminum ball. C. The gravitational potential energy of the copper ball is less than the gravitational potential energy of the aluminum ball. D. The kinetic energy of the copper ball and aluminum ball is equal. According to the theory that the higher the mass and the higher the mass of the object, the larger the gravitational potential energy is, the better the mass of the copper ball and the aluminum ball is. The center of gravity of the aluminum ball is higher than the center of gravity of the copper ball. Therefore, the gravitational potential energy of the copper ball is smaller than the gravitational potential energy of the aluminum ball. Selecting A and D is more appropriate.