The big hill on a roller coaster ride is 91.0m high.If the mass of the roller coaster and its two ri

题目

The big hill on a roller coaster ride is 91.0m high.If the mass of the roller coaster and its two riders is 314.0kg and the maximum velocity reached by this roller coaster ride is 28.0 m/s,how much Kinetic Energy is lost in the system?

答案

翻译：在过山车的大山是91.0米高.如果过山车和它的两个车手的质量是314.0千克并以此坐过山车达到的最大速度28.0米/秒,有多少动能损失在系统中?
根据能量守恒定律：重力势能=动能+损失能量
E(lost)=Ep-Ev=mgh-1/2mV^2=314.0*9.8*91.0-1/2*314.0*28.0^2
=280025.2-123088=156937.2J