共查询到18条相似文献,搜索用时 93 毫秒
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对平抛法测重力加速度进行了改进,选取朗威Dislab数字实验系统中的声音传感器测量小球下落时间,再计算重力加速度,此方法操作方便,易于在中学物理实验教学中实施. 相似文献
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根据公认的相关数据对地球半径进行计算得出的结果与地球半径的公认值存在很大的差别. 为此, 结
合对地球赤道和极地重力加速度的计算值进行分析与讨论 相似文献
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Tracker 软件是一种广泛使用的视频分析软件,通过分析物理实验视频,追踪研究对象的运动轨迹,以
简洁、高效的数据分析手段揭示物理现象背后所隐藏的物理规律. 利用 Tracker 软件分析了单摆测定重力加速度的
实验视频,通过自动追踪摆球运动的轨迹,精确测得了单摆运动的周期和重力加速度 相似文献
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用落体法测重力加速度的实验方案选择 总被引:1,自引:0,他引:1
重力加速度是物理学中一个重要的参量.地球上各地区的重力加速度的数值随地理纬度、海拔高度和地质结构的不同而不同.重力加速度的测量不仅在物理中具有重要意义,而且对于研究地层结构和探查地下资源都有实用价值,因此,细致地测量和准确地计算重力加速度是十分必要的.测量重力加速度的方法多种多样,本文利用自由落体原理,借助光电门测重力加速度.为减小误差对具体实验操作及数据处理方法的选择进行深入探讨. 相似文献
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Hai-chao Zhang Peng-fei Zhang Xin-ping Xu Feng Cheng Yu-zhu Wang 《Optics Communications》2009,282(16):3278-3281
Driven by resonance probe light background Rubidium gas can emit fluorescence, which interacts with the falling atomic cloud in the temperature measurement with the time-of-flight (TOF) method and influence the experimental results. The dependencies of the acceleration and the temperature of the atomic cloud on the detuning of the probe beams were studied. We propose that the deviation of the acceleration from the gravity acceleration can be taken as a criterion of the accuracy of the temperature measurement using TOF method. Moreover, using the principle of the radiation force on the cold atomic cloud, one may measure the considerably weak intensity of the fluorescence. 相似文献
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Burin Gumjudpai 《General Relativity and Gravitation》2004,36(4):747-766
The Friedmann equations for a brane with induced gravity are analyzed and compared with the standard general relativity and Randall-Sundrum cases. Randall-Sundrum gravity modifies the early universe dynamics, whereas induced gravity changes the late universe evolution. The early and late time limits are investigated. Induced gravity effects can contribute to late-universe acceleration. The conditions for this are found. Qualitative analysis is given for a range of scalar field potentials. 相似文献
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The causal structure of a five-dimensional C-metric like vacuum solution of Gauss-Bonnet gravity is analyzed in detail, the
Gauss-Bonnet parameter make it more complex than that of a C-metric like solution of Einstein gravity. The acceleration of
the observer fixed at a spatial position is calculated, the effect of the Gauss-Bonnet parameter comes in, but the acceleration
of the origin is not affected by the parameter. The geodesics of the test particles in the spacetime are investigated, it
is found that objects accelerate to go to the horizon in the accelerating spacetime. 相似文献
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The gedanken experiment of the clock paradox is solved exactly using the general relativistic equations for a static homogeneous gravitational
field. We demonstrate that the general and special relativistic clock paradox solutions are identical and in particular that
they are identical for finite acceleration. Practical expressions are obtained for proper time and coordinate time by using the destination distance as
the key observable parameter. This solution provides a formal demonstration of the identity between the special and general
relativistic clock paradox with finite acceleration and where proper time is assumed to be the same in both formalisms. By
solving the equations of motion for a freely falling clock in a static homogeneous field elapsed times are calculated for
realistic journeys to the stars.
1 Both authors contributed equally to this paper. 相似文献
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Experimental investigation of a stratified discharge in a magnetic field with the help of probe dusty particles falling through the discharge under the gravity force is described. The radial and azimuthal accelerations of probe particles in the stratum volume are measured. It is found that the particles move in the stratum without accelerations except in two regions. In the first region, the acceleration has two components directed toward the tube axis and upward, whereas, in the second region, they are directed toward the tube wall and downward. 相似文献
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Rickard Jonsson 《General Relativity and Gravitation》2001,33(7):1207-1235
Starting from the equations of motion in a 1 + 1 static, diagonal, Lorentzian spacetime, such as the Schwarzschild radial line element, I find another metric, but with Euclidean signature, which produces the same geodesics x(t). This geodesically equivalent, or dual, metric can be embedded in ordinary Euclidean space. On the embedded surface freely falling particles move on the shortest path. Thus one can visualize how acceleration in a gravitational field is explained by particles moving freely in a curved spacetime. Freedom in the dual metric allows us to display, with substantial curvature, even the weak gravity of our earth. This may provide a nice pedagogical tool for elementary lectures on general relativity. I also study extensions of the dual metric scheme to higher dimensions. 相似文献
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绝对重力仪是直接开展绝对重力测量的精密计量仪器.绝对重力测量是指对地球表面重力加速度值的直接测量,其在地球科学和计量科学等领域都有十分重要的应用.历史上最早的绝对重力测量约在1590年.1590~1960年,主要利用摆仪的摆长和自由摆周期来开展绝对重力测量.自1960年起,随着激光技术的发明,高精度绝对重力测量有了新的... 相似文献
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Astronomical data in favor of cosmological acceleration and possible explanations of accelerated expansion of the universe are discussed. Main attention is paid to gravity modifications at small curvature which could induce accelerated cosmological expansion. It is shown that gravitating systems with mass density rising with time evolve to a singular state with infinite curvature scalar. The universe evolution during the radiation-dominated epoch is studied in the R 2-extended gravity theory. Particle production rate by the oscillating curvature and the back reaction of particle production on the evolution of R are calculated in one-loop approximation. Possible implications of the model for cosmological creation of non-thermal dark matter are discussed. 相似文献