共查询到17条相似文献,搜索用时 93 毫秒
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中学阶段,用牛顿第二定律解题,选择的参照系往往是静止或匀速直线运动的平动系,比较多的选择地球为惯性参考系.但是有时物体相对于地面的运动是复杂的,甚至无法直接布列方程,这时可作如下处理: 相似文献
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众所周知,单摆小角度的振动为周期性的简谐振动.而简谐振动就是物体受到一个始终指向平衡位置的回复力作用.因此寻找平衡位置是解决这类问题的关键在非惯性参考系中的单摆运动确定平衡位置更为重要.笔者应用动静法,先确定单摆在非惯性参考系中的平衡位置,求出平衡位置处单摆的绳子的张力,继而求出它的振动周期.现举例如下: 相似文献
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力学中一个令人费角的问题 总被引:2,自引:1,他引:1
当系统包含地球而又在地面参照系或相对于地面匀速运动的参照系中研究问题时,地面参照系或相对于地面包速运动的参照系便不能为惯性参照系,此时必须考虑地球所受的惯性力。 相似文献
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非惯性参照系中的伯努利方程 总被引:3,自引:0,他引:3
一般非惯性参照系可分解为加速平动参照系和转动参照系。给出这两种参照系中理想流失满足的动力学方程,可解决非惯性参照系中的流体动力学问题。 相似文献
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推导相对惯性系作直线运动的常加速度内禀刚性加速系的坐标变换关系式,并讨论该加速系的主要性质。 相似文献
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We give a study on the general Møller transformation and emphatically introduce its differential form. In this paper, a definition of acceleration is given in spacetime language and the inertial reference frame is also settled. With a discussion of thegeodesic equations of motion, the differential form of the general Møller transformation at arbitrary direction is presented. 相似文献
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Robert K. Niven 《Entropy (Basel, Switzerland)》2021,23(11)
This study examines the invariance properties of the thermodynamic entropy production in its global (integral), local (differential), bilinear, and macroscopic formulations, including dimensional scaling, invariance to fixed displacements, rotations or reflections of the coordinates, time antisymmetry, Galilean invariance, and Lie point symmetry. The Lie invariance is shown to be the most general, encompassing the other invariances. In a shear-flow system involving fluid flow relative to a solid boundary at steady state, the Galilean invariance property is then shown to preference a unique pair of inertial frames of reference—here termed an entropic pair—respectively moving with the solid or the mean fluid flow. This challenges the Newtonian viewpoint that all inertial frames of reference are equivalent. Furthermore, the existence of a shear flow subsystem with an entropic pair different to that of the surrounding system, or a subsystem with one or more changing entropic pair(s), requires a source of negentropy—a power source scaled by an absolute temperature—to drive the subsystem. Through the analysis of different shear flow subsystems, we present a series of governing principles to describe their entropic pairing properties and sources of negentropy. These are unaffected by Galilean transformations, and so can be understood to “lie above” the Galilean inertial framework of Newtonian mechanics. The analyses provide a new perspective into the field of entropic mechanics, the study of the relative motions of objects with friction. 相似文献
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M. A. Oliver 《Foundations of Physics Letters》1991,4(4):337-350
The distribution of astronomical redshifts and the cosmic background radiation define a unique inertial reference frame. This paper contains an investigation of questions concerning quantum theory which arise with the introduction of a unique rest frame into spacetime. The Mössbauer effect, photon pair production, and photoelectric effect are treated together with photon scattering by a moving reflector and the Compton effect. Dirac's 1928 quantum theory of electrons is shown to yield its well-known energy spectrum for the hydrogen atom independently of the velocity of the atom relative to the rest frame.1. Address for the academic year 1990–91: 415 Graduate Studies Research Center, University of Georgia, Athens, Georgia 30602, USA. 相似文献