So this is our circular orbit X with radius r, and at location X, at 12:00, that is where I fire my rocket.
这是我们的圆形轨道,半径为r,在点,12点的位置,是我发射火箭的位置。
Within that window, type screen -x -r sharing -p one.
在此窗口中,输入screen - x - r sharing - p one。
But, basically you don't really need to remember these formulas as long as you remember how to express r in terms of rho sine phi, and x equals r cos theta.
事实上你不用记住这些公式,只需要知道r=ρ*sinφ,而x=r*cosθ
Y You don't want to rename them L and R or X and Y right because you want to call them left and right.
你不想把它们重命名为L和R,或者X和,因为你想叫它们为left和。
At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.
在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化
If you are describing a particle with location R, the vector we use typically to locate a particle, R then R is just i times x + j times y, because you all know that's x and that's y.
如果你要描述一个位移为 R 的质点,这个矢量一般用表示质点 R 的位移,R 可表示为 i ? x + j ? y,显然你们都知道这段是 x,那段是 y
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