一道有关斜抛的英语物理题.重分酬谢Pitcher's mounds are raised to compensate for the vertical drop of the ball as it travels a horizontal distance of 18m to the catcher.a)If a pitch is thrown horizontally with an inital speed of 32m/s,h
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一道有关斜抛的英语物理题.重分酬谢Pitcher's mounds are raised to compensate for the vertical drop of the ball as it travels a horizontal distance of 18m to the catcher.a)If a pitch is thrown horizontally with an inital speed of 32m/s,h
一道有关斜抛的英语物理题.重分酬谢
Pitcher's mounds are raised to compensate for the vertical drop of the ball as it travels a horizontal distance of 18m to the catcher.a)If a pitch is thrown horizontally with an inital speed of 32m/s,how far does it drop by the time it reaches the catcher?b)If the speed of the pitch is increased,does the drop distance increase,decrease,or stay the same?Explain.c)If this baseball game were to be played on the Moon,would the drop distance increase,decrease,or stay the same?Explain.
一道有关斜抛的英语物理题.重分酬谢Pitcher's mounds are raised to compensate for the vertical drop of the ball as it travels a horizontal distance of 18m to the catcher.a)If a pitch is thrown horizontally with an inital speed of 32m/s,h
第一问：同
这是一道简单的平抛运动
a 18/32=9/16(s) s=1/2*g*t^2=405/256(m)
第二问,投掷速度增大,接球手的位置是不变的,水平距离不会变化,则时间会缩短,而重力加速度不变,则下落距离会缩短.
第三问,月球的重力加速度比地球小,而其他都不变,所以下落距离会缩短.
这是一道简单的平抛运动
a 18/32=9/16(s) s=1/2*g*t^2=405/256(m)
b 速度越快距离越远 因为重力加速度不变 但是飞行的时间短 所以下落距离短c 月球的重力加速度小 所以时间不变的话 下落距离短
a、
到达接手的时间=距离/速度=18/32s
下落距离=1/2gt^2=1/2*9.8*(18/32)^2=1.55m
b、
速度增加到达接手时间减少，因此下落距离减少。
c、
月球上的重力加速度只有大约地球上的1/6，所以下落距离要比地球上的少。
OMG~~物理~~噩梦！