一个光滑的圆锥体固定在水平桌面上,其轴线沿竖直方向,母线与轴线之间的夹角为 θ = 30 °,如图 4 所示 . 一长为 L 的绳(质量不计),一端固定在圆锥体的顶点 O 处,另一端拴着一个质量为 m 的小物体(可看做质点).物体以速度 v 绕圆锥体的轴线在水平面内做匀速圆周运动. ( 1 )当 v 1 = 时,求绳对物体的拉力; ( 2 )当 v 2 = 时,求绳对物体的拉力.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【简答题】分块检索中,若索引表和各块内均用顺序查找,则有900个元素的线性表分成()块最好In the blocking search, if we use sequential search to the index table and each block, then the linear table which has 900 elements should be divided into () pa...
【单选题】Do you find it very difficult and painful to get up in the morning? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. During ...
【简答题】Text 3 Do you find it very difficult and painful to get up in the morning? This might be called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy cycle. ...