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目的抛射体运动的轨迹称为弹道。如图1所示,设抛射体从点O射出,与横轴OX成角θ,它的速度是v,在空气阻力不计时,弹道是一抛物线OPQ。点P是弹道的最高点。 相似文献
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本文求出了平方律阻力下运动的抛射体,以斜率 f′为参数的非线性微分方程解的积分表示式,讨论了其物理意义,还得到射程的近似解析表达式. 相似文献
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投篮球入篮、推铅球和掷手榴弹这三种常见的运动,可以用比较简单的抛射体运动的计算方法和公式来统一处理.这是因为,篮球、铅球和手榴弹在空中运动的速度不大,我们主要关心重心位置的变化,空气阻力影响可以忽略不计(参看下面所给的参考数据).本文将分别讨论有关这三种运动的一些有实际意义的有趣味的问题. 相似文献
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在忽略空气阻力的情况下,抛射体运动的飞行路径长度与抛射初速度的平方成正比;运用Matlab可比较容易地证明,当抛射角为56.49°时,飞行路径最长. 相似文献
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测重力加速度有很多方法,本文介绍一种新的实验方法——水流法。通过水流的斜抛运动产生的抛物线来测量重力加速度。一、仪器实验装置见图1。容器工和容器5固定 相似文献
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V. V. Gonyaev 《Russian Physics Journal》1979,22(7):706-708
This paper discusses the relativistic relation between the observed velocity and acceleration of free fall, which was obtained previously by the author. The contradiction is shown between this relation and the experimental results on the equivalence of gravitational and inertial mass. For the measurement of the free-fall acceleration of a relativistic charged particle, it is proposed that use be made of a uniform magnetic field limiting the region of motion of the particle, which is performing a free fall along the direction of the field.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 25–28, July, 1979. 相似文献
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Mark P Haugan 《Annals of Physics》1979,118(1):156-186
If the equivalence principle is violated, then observers performing local experiments can detect effects due to their position in an external gravitational environment (preferred-location effects) or can detect effects due to their velocity through some preferred frame (preferred-frame effects). We show that the principle of energy conservation implies a quantitative connection between such effects and structure-dependence of the gravitational acceleration of test bodies (violation of the Weak Equivalence Principle). We analyze this connection within a general theoretical framework that encompasses both non-gravitational local experiments and test bodies as well as gravitational experiments and test bodies, and we use it to discuss specific experimental tests of the equivalence principle, including non-gravitational tests such as gravitational redshift experiments, Eötvös experiments, the Hughes-Drever experiment, and the Turner-Hill experiment, and gravitational tests such as the lunar-laser-ranging “Eötvös” experiment, and measurements of anisotropies and variations in the gravitational constant. This framework is illustrated by analyses within two theoretical formalisms for studying gravitational theories: the PPN formalism, which deals with the motion of gravitating bodies within metric theories of gravity, and the TH?μ formalism that deals with the motion of charged particles within all metric theories and a broad class of non-metric theories of gravity. 相似文献
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基于高速CCD相机主光轴的转镜弹道同步跟踪系统,研究了高速飞行弹丸飞行姿态和飞行速度的问题,利用转镜的反射原理和转镜运动规律,建立了转镜随弹丸运动的时空关系模型和转镜运动参数的数学模型,并推导转镜运动参数与弹丸飞行速度和弹道距转镜中心垂直高度之间的数学关系;在理论分析的基础上,用MATLAB分析了转镜视场内的弹道宽度随时间变化的规律以及转镜转角和角加速度随时间变化的规律,得到在某一时刻转镜视场的大小以及转镜参数的变化曲线;给出了转镜尺寸、扫描速率曲线和最大离散速度等主要参数的计算方法,分析了它们对整个跟踪系统的影响。针对系统设置参数为h=150 m, v=300 m/s时进行仿真,仿真结果表明本系统可实现对高速弹丸的同步跟踪。 相似文献
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Lars V. J?rgensen 《Hyperfine Interactions》2012,212(1-3):41-49
The experimental program of the AEgIS experiment at CERN’s AD complex aims to perform the first measurement of the gravitational interaction of antimatter, initially to a precision of about 1%, to ascertain the veracity of Einstein’s Weak Equivalence Principle for antimatter. As gravity is very much weaker than electromagnetic forces, such an experiment can only be done using neutral antimatter. The antihydrogen atoms also need to be very cold for the effects of gravity to be visible above the noise of thermal motion. This makes the experiment very challenging and has necessitated the introduction of several new techniques into the experimental field of antihydrogen studies, such as pulsed formation of antihydrogen via 3-body recombination with excited state positronium and the subsequent acceleration of the formed antihydrogen using electric gradients (Stark acceleration). The gravity measurement itself will be performed using a classical Moire deflectometer. Here we report on the present state of the experiment and the prospects for the near future. 相似文献
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A system of coupled point masses under the influence of gravitational waves is considered. By means of the geodesic deviation
equation as the equation of motion it is shown, taking into account the second order small terms, that there exist forces
which cause the acceleration of the system in the longitudinal direction. The longitudinal force is due to the fact that simultaneously
with energy momentum is also absorbed from waves. It is proved directly on the basis of the equations of motion of the point
masses that the energy and momentum absorbed by the test system obey the special relativistic relationship of a zero rest
mass particle. The case when the Weber oscillator moves at a relativistic speed with respect to the source of gravitational
waves is also examined. In this case, the absorption of energy and momentum by the Weber oscillator is much larger or smaller
compared to the stationary situation. 相似文献