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31#
發(fā)表于 2025-3-26 22:02:29 | 只看該作者
32#
發(fā)表于 2025-3-27 02:49:10 | 只看該作者
The Development of American Sociology,cern is with mechanical energy. Mechanical energy is of two types: kinetic energy and potential energy. . is the energy of a body by virtue of its motion. . is the energy of a body by virtue of its position. A body is held so that it is stationary and then released; if it moves then it possesses pot
33#
發(fā)表于 2025-3-27 05:20:42 | 只看該作者
34#
發(fā)表于 2025-3-27 13:21:46 | 只看該作者
https://doi.org/10.1007/978-1-349-27552-6ving vertically under the influence of the Earth’s gravity, with or without resistance. Nevertheless, falling raindrops, parachutists, balls and so on, and upwardly projected bullets, missiles and balls comprise a very important class of problems. Because of their limited scope, we can solve virtual
35#
發(fā)表于 2025-3-27 13:47:59 | 只看該作者
https://doi.org/10.1007/978-94-015-0859-9flight of a golf ball, a high jumper or the motion of a jet of water from a hose pipe. The analysis of projectile motion is one of the most common uses of kinematics in the real world. The number of occasions in any one day that you will encounter examples of projectile motion are many. If you are i
36#
發(fā)表于 2025-3-27 18:17:30 | 只看該作者
37#
發(fā)表于 2025-3-28 01:18:45 | 只看該作者
Sociology and the World‘s Religionsng way to think of an impulse is in terms of an external agent that alters momentum. Common such agents are baseball or cricket bats striking, and significantly changing, the momentum of a moving ball. The batter (usually) feels a jolt in the wrists, and this is the impulse. This type of impact, col
38#
發(fā)表于 2025-3-28 05:29:56 | 只看該作者
https://doi.org/10.1007/978-3-319-89450-8ght, this seems a straightforward requirement to satisfy. Further thought will, however, reveal the difficulty. The Earth is rotating about its axis, and the centre of the Earth rotates once a year around the Sun. Hence, in absolute terms, one is hard pressed to find a point that is not moving; ther
39#
發(fā)表于 2025-3-28 08:46:04 | 只看該作者
https://doi.org/10.1007/978-3-319-89450-8that rotate. These are problems involving distances and times comparable to the radius of the Earth and the period of rotation of the Earth respectively. For a second class of problems, it is more convenient, and perhaps constructive, to use a rotating coordinate system. Problems that fall into this
40#
發(fā)表于 2025-3-28 13:08:05 | 只看該作者
Rotating Axes,that rotate. These are problems involving distances and times comparable to the radius of the Earth and the period of rotation of the Earth respectively. For a second class of problems, it is more convenient, and perhaps constructive, to use a rotating coordinate system. Problems that fall into this
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