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曾几何时,地球外来访客——陨石就不断造访地球,动辄砸出数米甚至数十米深坑,除诸多要素外,其重力加速度是重要因素。重力加速度通常指地面附近物体受地球引力作用在真空中下落的加速度。为了便于计算,其近似标准值通常取为980 cm/s~2或9.8 m/s~2的二次方。由此可得出,将1 kg物体从1 000 m高空自由落下,如果忽略空气阻力,其落地速度接近150 m/s,其冲击力约为1 420 N,而手枪子弹的出膛速度约为300 m/s。显而易见,一个高空落下
Once upon a time, the Earth’s foreign visitors - meteorites on the earth continue to visit, frequently punching meters or even tens of meters deep pit, in addition to many factors, the acceleration of gravity is an important factor. Gravitational acceleration usually refers to the ground near the object by the Earth’s gravitational pull in the vacuum acceleration. For ease of calculation, the approximate standard value is usually taken as 980 cm / s ~ 2 or 9.8 m / s ~ 2 quadratic. From this it can be concluded that if a 1 kg object falls freely from 1 000 m above sea level, its airborne landing speed is close to 150 m / s and its impact force is about 1 420 N, while that of a pistol bullet is about 300 m / s. Obviously, a high altitude