一道英语物理题A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same heightWhat is the maximum height of the ball on its way to the receiver?

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 06:55:39
一道英语物理题A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same heightWhat is the maximum height of the ball on its way to the receiver?

一道英语物理题A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same heightWhat is the maximum height of the ball on its way to the receiver?
一道英语物理题
A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same height
What is the maximum height of the ball on its way to the receiver?

一道英语物理题A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same heightWhat is the maximum height of the ball on its way to the receiver?
翻译如下：
一个球员以20m/s的速度抛出了一只足球,球离开他手时离地1.8m,接着,球在同一高度下被30米外的另一个球员接住了
请问,球的运动轨迹上可能的最大高度为多少?
要设角度来做的,设抛出时速度方向和水平夹角为A
所以球的水平速度是20cosA,竖直速度是20sinA,方向向上
所以球运动的时间就是t=s/v=30/20cosA
所以竖直速度就要满足20sinA/g=0.5*30/20cosA
算出角度A为0.5arcsin0.75,得出水平速度,竖直速度,运动时间
所以最大高度就为0.5*竖直速度*运动时间=3.386m

关于速度 力 的

计算抛物线最高点的。
大致意思是，一个橄榄球以20m/s的速度在距离地面1.8米的高度被投出，如果在30m外，能够在同样的高度接住，问这个橄榄球在飞行过程中的最大高度是多少

说白了就是初速度为20m/s的物体做抛体运动，水平位移30m，垂直为0.列方程解就行了，水平初速度20cos x，垂直20sin x ，最后解得垂直位移为10*（1-根号7再除以4）约为3.39m。
真够累的，这是哪里出的数学题啊……汗颜,不会是你想知道qb传给跑峰的球能否在空中拦截？呵呵，放心，3.3米多呢，一般人是断不了的...

全部展开

说白了就是初速度为20m/s的物体做抛体运动，水平位移30m，垂直为0.列方程解就行了，水平初速度20cos x，垂直20sin x ，最后解得垂直位移为10*（1-根号7再除以4）约为3.39m。
真够累的，这是哪里出的数学题啊……汗颜,不会是你想知道qb传给跑峰的球能否在空中拦截？呵呵，放心，3.3米多呢，一般人是断不了的

收起

一道英语物理题A quarterback passes the football downfield at 20m/s .It leaves his hand 1.8m above the ground and is caught by a receiver 30m away at the same heightWhat is the maximum height of the ball on its way to the receiver? 一道物理题,为什么选A 一道英语物理题 关于功函数的 物理题一道,第五题为什麽选a? 一道物理题, 一道物理题, 一道物理题, 一道物理题, 一道物理题, sack the quarterback 英语被动句改主动句主动改被动,被动该主动1.A mistake was made in using too much passive voice2.UFOs were reported by faemers who had seen atrange sights.3.The game was won when a touchdown was scored by the quarterback.4.We were dren 一道高中物理题.A选项为什么不对,谢谢 一道奇葩的物理题,我选B答案A, 一道物理题,电场方面,第五题,我觉得是A 一道比较难的物理题,求A表读数, 英语物理题 a bullet fired from a rifle.a football quarterback running at top speed a horse walking at about 2miles/hour哪个动量最大? 解一道初中物理题