200分求)大一物理题,因为是英语版的,呵呵 The particles each of mass m and speed v,travel in opposite directions along parallel lines separated by a angular,The total angular momentum of the system about any origin is_______. 翻译一下也可以,
fill in the blank: mvd. 两个质量为m速度为v的粒子沿着被某角度分开的平行线做相反方向的运动.角动量总值在任何原始出发点(都相等) let the point be (x,y) angular momentum of first particle = mvr1sin@ = mvp angular momentum of second particle = mvr2sin@ = mvq net angular momentum ( the angular momenta are in the same direction) = mvp+mvq =mvd (constant and independent of x and y)