题目

如图所示，长为l=1m的绳子下端连着质量为m=1kg的小球，上端悬于天花板上，把绳子拉直，绳子与竖直线夹角为60°，此时小球静止于光滑的水平桌面上.问:（g取10 m/s2）（1）当球以ω1=4rad/s作圆锥摆运动时，绳子张力T1为多大? 桌面受到压力为多大?（2）当球以ω2=6rad/s作圆锥摆运动时，绳子张力T2及桌面受到压力各为多大? Those who are ______ the proposal are expected to discuss it in detail after the meeting. A．in favour of B．in memory of C．in honour of D．in search of