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题目在兵器工业中,子弹射出的速度是衡量枪械性能的指标之一。有一种运用“旋转法”测子弹速度的方法,如图所示。在电动机转轴上固定两个间距为20cm的薄塑片,电动机以300转/秒的转速匀速转动,枪械正对塑片水平射击,子弹穿越时的阻力不计。对一般步枪测试,子弹在两塑片之间飞行的这段时间内,塑片旋转不超过两圈。现对子弹速度在200m/s以上的某型号步枪进行测试,子弹先后射穿
In the weaponry industry, the speed at which shots are shot is one of the indicators of gun performance. There is a use of “rotation method ” method of measuring the speed of the bullets, as shown. Fixed on the motor shaft are two thin plastic sheets with a spacing of 20 cm. The motor rotates at a constant speed of 300 revolutions per second, the firearm is shooting horizontally at the plastic sheet and the resistance of the bullets crosses. For a general rifle test, the flaps rotate no more than two turns during the time the bullet flies between the two sheets. Now the bullet speed of 200m / s and above a model rifle for testing, the bullets have pierced