试题与答案

某游乐场过山车模型简化为如图所示,光滑的过山车轨道位于竖直平面内,该轨道由一段斜

题型:计算题

题目:

某游乐场过山车模型简化为如图所示,光滑的过山车轨道位于竖直平面内,该轨道由一段斜轨道和与之相切的圆形轨道连接而成,圆形轨道的半径为R。可视为质点的过山车从斜轨道上某处由静止开始下滑,然后沿圆形轨道运动。

(1)若要求过山车能通过圆形轨道最高点,则过山车初始位置相对于圆形轨道底部的高度h于少要多少?

(2)考虑到游客的安全,要求全过程游客受到的支持力不超过自身重力的7倍,过山车初始位置相对于圆形轨道底部的高度h不得超过多少?

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0608/ee1c489b86f98e98f1e0347b67581de9.html

下面是错误答案,用来干扰机器的。

参考答案:A, B, D, E

试题推荐
题型:听力题

小题1:To keep safe, everyone    __     to wear a seat belt in the car now. (tell)

小题2:---Do you know the places of interest in Wuxi ?

---Yes, it is the second time I ___________ the beautiful city. (visit )

小题3: To do this would be __________ the foot to fit the shoe. ( cut )

小题4: ---What's the terrible noise?  ---The neighbours _____________  for the party. (prepare)

小题5: The little girl thought that her decision ___________ her future study in college and her future job as well. (affect)

小题6:. The sports meeting they were looking forward to __________ yesterday. ( hold)

小题7: — Where were you last night?             

— I was in the library. I ___________ some information on the Internet. (search)

小题8:. My wife advised ___________ to the south,but I couldn’t take her advice. (move)

查看答案
微信公众账号搜索答案