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不少参考书上有这样的题目:人造地球卫星在运行轨道上遇到一个宇宙尘埃区城,穿过这个区域其运行情况怎样变化?高中物理(试用本)下册147页(11)题中问“卫星绕通过南北极的平面运行时,地磁场对它的运行发生什么影响?”也属于这类问题。不少人认为卫星受到阻碍,它必须克服阻力做功,消耗动能,使速率减小,再根据卫星运行所需向心力等于地球对它的万有引力(GMm/r~2=mv~2/r,v=(GM/r)~(1/2),而得出卫星轨道半径变大,离地面的高度增加的结论,粗看起来是合理的,其实“使速率减小”这个
Many reference books have such a problem: Man-made earth satellites encounter a cosmic dust zone in the running orbit, and how does the operation of the satellites vary across the region? High school physics (trial paper) 159 (11) Q. “What effect does the Earth’s magnetic field have on its operation when the satellite orbits through the north and south poles?” also falls into this category. Many people think that satellites are hindered. It must overcome resistance to do work, consume kinetic energy, and reduce the rate. The centripetal force needed for satellite operation is equal to the universal gravitation of the earth (GMm/r~2=mv~2/r,v= (GM/r) ~ (1/2), and conclude that the radius of the satellite orbit becomes larger and the height from the ground increases, the rough looks reasonable, in fact, “makes the rate decrease”