作业帮一道英文的物理题,急（关于energy）
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/10 11:02:05
一道英文的物理题,急（关于energy）
A simple pendulum of length 2.00 m is made with a mass of 2.00 kg.The mass has a speed of 3.00 m/s when the pendulum is 30.0o above its lowest position.What is the maximum angle away from the lowest position the pendulum will reach?
A simple pendulum of length 2.00 m is made with a mass of 2.00 kg.The mass has a speed of 3.00 m/s when the pendulum is 30.0o above its lowest position.What is the maximum angle away from the lowest position the pendulum will reach?
1/2mv^2=mgh
1/2*2*3^2=2*10*h
h=0.45m
(Lcos30-h)/L=cosA
cosA=(2*1.732/2-0.45)/2=0.641
A=carcos0.641=50度