大学物理题 求助 原题英文的 大意我翻出来 附原文
大意是斜抛向上60°最后落在上方直线距离0.8m处求初速度vAtwhatspeedshouldanarcherfishspitthewatertoshootdownafl...
大意是斜抛向上60° 最后落在上方直线距离0.8m处 求初速度v
At what speed should an archerfish spit the water to shoot down a floating insect located at a distance 0.800m from the fish? Assume that the fish is located very close to the surface of the pond and spits the water at an angle 60° above the water surface. 展开
At what speed should an archerfish spit the water to shoot down a floating insect located at a distance 0.800m from the fish? Assume that the fish is located very close to the surface of the pond and spits the water at an angle 60° above the water surface. 展开
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设时间为t，将初速度分解为水平方向和竖直方向，
列方程：
v*0.5*t=0.8
/3*v*t-0.5*g*t^2=0
其中*为乘号，/3为根号3，t^2为t平方
解得v=5//3(5除以根号3)=2.887
列方程：
v*0.5*t=0.8
/3*v*t-0.5*g*t^2=0
其中*为乘号，/3为根号3，t^2为t平方
解得v=5//3(5除以根号3)=2.887
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