你的式子我沒看懂?
有一個隱含條件:自由落體速度為9.81(或10)米每秒平方
其實就是炮彈的縱向速度(60sinx)每秒減(9.81)10的情況下直到其為負的60sinx,這時其橫向移動距離,及(60cosx)乘以(120sinx)除以9.81(或10)的商的積是320
中間用一下(sinx)平方加(cosx)平方為1的轉(zhuǎn)換公式我用的是y=-(1/2)g^2*t+Vo(sin theta)*t+ho和x=Vo(cos theta)t的公式. 然后我得到y(tǒng)=-4.9t^2+60(sin theta)t和x=60cos(theta)t. 然后因為可以設(shè)x=320m. 就變成了320=60cos(theta)t. 那之后要怎么求呢?你的y是什么?y是horizontal motion, x是vertical motion啊
一道英文數(shù)學(xué)題目(追加10分)
一道英文數(shù)學(xué)題目(追加10分)
In priates of the caribbean, a cannon was fired at an enemy ship. The muzzle velocity was 60m/s. At what angle above the horizontal must the cannon have been aimed in order to hit the enemy ship 320 m away?(Dont worry about intial height on this one. The ships will be at the same level due to calm seas)
我用算式y(tǒng)=-4.9t^2+60sin(theta)t 和x=60 cos(theta)t 然后設(shè)320=60 cos(theta)t 然后我知道要用sin theta/cos theta 但是怎么做呢?
In priates of the caribbean, a cannon was fired at an enemy ship. The muzzle velocity was 60m/s. At what angle above the horizontal must the cannon have been aimed in order to hit the enemy ship 320 m away?(Dont worry about intial height on this one. The ships will be at the same level due to calm seas)
我用算式y(tǒng)=-4.9t^2+60sin(theta)t 和x=60 cos(theta)t 然后設(shè)320=60 cos(theta)t 然后我知道要用sin theta/cos theta 但是怎么做呢?
英語人氣:815 ℃時間:2020-06-08 13:17:28
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