作者latency (出乎意料的忙@@")
看板TransPhys
标题[力学] 看不懂的题目 谁帮我解释一下
时间Thu Oct 27 19:04:54 2005
A cannon that is mounted at angle α to the horizontal on a
flatcar initially at rest. The mass of the car and cannon is
M. A cannonball of mass m is fired at speed V relative to the
cannon.
(a) Show that the recoil speed of the flatcar is (mV cosα)/(M+m).
(b) Show that the angle θ to the horizontal at which the ball
energes from the cannon is given by tanθ=(M+m)tanα/M.
(b)的部分我一直不是什麽意思耶...哪里突然冒出来的θ呀？
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.114.198.51
1F：推 Morphee:这题有图吗? 10/28 14:33
2F：推 Morphee:不过题干已说明角度的意思了 10/28 15:28
3F：推 xyz2k:θ角是指球从大炮口出来的角度 而α角是大炮炮口的角度 10/28 16:51