一颗子弹在枪筒里前进时受到的合力是F=400-【(4*10²)*x】/3 (SI),枪筒长度为0.3m ,则合力对子弹做的功是?求列式
你能否用积分?
-.-!!! int(fdx,0,0.2) = int(400dx - 400/3*xdx, 0, 0.3) = 400x - 200/3*x^2, from 0 to 0.3 = 114