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对这个测g值的初等实验设想如下:如果下落的小球质量接近无限大,例如用中子星的材料,空气的阻力就能忽略,当然不可能找到这种材料.可以选择几个密度不同的小球,再把测出的结果外推到密度无限大的情况,这就能使g值尽可能地准确.小球的材料可以选钨、铁、铝和聚氯乙烯,由于有空气阻力,利用它们测出的g_测值比当地的标准值g=9.806315米/秒~2要小些. 先选钨制的小球,因它的密度比较大,约为20克/厘米~3,小球质量约80克.我们设计了一台气动释放装置,其原理如图1和图2所示.利用一台小真空泵或直接用嘴来获得减压,这样可以很容易把比较重的钨球吸住.把小球释放,它下落了一小段距离s以后,在光门1处的初速度是v_i,距离s不用测出,
The initial experiment for this g-value is conceived as follows: If the falling ball mass is close to infinity, for example with a neutron star material, the air resistance can be ignored. Of course it is impossible to find this material. You can choose several small different densities Ball, then extrapolate the measured result to an infinitely high density, this will make the g value as accurate as possible. The ball material can be selected tungsten, iron, aluminum and polyvinyl chloride, due to the air resistance, use Their measured g-values are smaller than the local standard value of g=9.806315 m/s~2. The tungsten ball is selected first, because its density is relatively large, about 20 g/cm~3, small The ball mass is about 80 grams. We designed a pneumatic release device, the principle of which is shown in Figures 1 and 2. Using a small vacuum pump or directly with the mouth to obtain decompression, it can easily put a heavy tungsten ball Suction. The ball is released. After it has fallen for a short distance s, the initial velocity at the light gate 1 is v_i. The distance s is not measured.