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练气功的人仰卧在地面上,上百公斤的大石块平压在他的胸上,另一个人用数公斤的铁锤猛烈锤打石块,结果石块分裂开来,而人的肋骨仍然完好。这是什么道理?设大石块的质量为 M,则人的肋骨在紧张肌肉的支持下,至少应能承受 Mg 的压力,否则石块的静压就会把肋骨压断。怎样做才能将肋骨压断呢?事实上,需要一个逐渐增大的力作用一定的距离,即需要作一定
The person practicing qigong lay supine on the ground. Hundreds of kilograms of rock were pressed flat against his chest. Another man hammered stones with a few kilograms of hammers. The result was that the stone split and the ribs Still in good condition. What is the reason? If the mass of a large rock is M, then human ribs should be able to withstand the pressure of Mg at least with the support of muscles, otherwise the static pressure of the stones will break the ribs. What to do in order to break the ribs? In fact, it takes a gradually increasing force to act a certain distance, that is, it needs to be certain.