
一道物理题,我算了N次数都不对,不知道哪里错了,求答案和算法!!
Inasceneinanactionmovie,astuntmanjumpsfromthetopofonebuildingtothetopofanotherbuildin...
In a scene in an action movie, a stunt man
jumps from the top of one building to the
top of another building 3.5 m away. After a
running start, he leaps at an angle of 17 with
respect to the flat roof while traveling at a
speed of 4.8 m/s.
The acceleration of gravity is 9.81 m/s2 .
To determine if he will make it to the other
roof, which is 1.0 m shorter than the build-
ing from which he jumps, find his vertical
displacement upon reaching the front edge of
the lower building with respect to the taller
building.
Answer in units of m
在动作电影一场景中,特技演员从一个房顶跳到相距3.5米的另一房顶,起跑后他以相对于一楼屋顶17度角度起跳,运动速度4.8米/秒。重力加速度为9.81米/秒。确定他是否能够跳到比起跳屋顶低一米的屋顶,找到到达较低房顶前缘的垂直位移。答案用米计算 展开
jumps from the top of one building to the
top of another building 3.5 m away. After a
running start, he leaps at an angle of 17 with
respect to the flat roof while traveling at a
speed of 4.8 m/s.
The acceleration of gravity is 9.81 m/s2 .
To determine if he will make it to the other
roof, which is 1.0 m shorter than the build-
ing from which he jumps, find his vertical
displacement upon reaching the front edge of
the lower building with respect to the taller
building.
Answer in units of m
在动作电影一场景中,特技演员从一个房顶跳到相距3.5米的另一房顶,起跑后他以相对于一楼屋顶17度角度起跳,运动速度4.8米/秒。重力加速度为9.81米/秒。确定他是否能够跳到比起跳屋顶低一米的屋顶,找到到达较低房顶前缘的垂直位移。答案用米计算 展开
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17度?好难算的角度啊。。。。。。
这个三角函数。。。。。。我不知道呀。。。。。。。
这个三角函数。。。。。。我不知道呀。。。。。。。
来自:求助得到的回答
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因为你的题当中没有说明是否考虑空气阻力,所以我计算的是忽略空气阻力的.把演员的运动过程看成首先是斜抛,与水平方向夹角为17度,之后是平抛运动,在这两个运动中,水平方向的速度是不变的为4.8*cos17度=0.96,斜抛上升所用的时间为4.8*sin17度/9.81=0.142s,水平位移为哦。0。654m,在平抛运动中,由于下落的高度增加一米,所以时间发生变化,要先求出上升的高度,在加1m为平抛运动中下落的高度,为1.099米,此时的时间为0.473s,计算平抛的水平位移为2.180米,加上斜抛的水平位移0.654米为2.834米小于要求的3.5米,所以不可以。
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