吊在室内天花板上的电风扇,静止不动时对固定吊杆的拉力为F 电风扇静止时受到的重力和固定杆对它的拉力是一对平衡力,即F1=G;电风扇转动时,风扇叶片周围空气流速快,下面空气流速慢,从而产生一个压强差,进而产生压力差,这个压力向上,此时风扇叶受到了三个力的作用,重力G、固定杆对扇叶的拉力F2、空气对扇叶施加的向上力F′,风扇在这三个力的作用下在竖直方向上静止,所以G=F2+F′,F2故答案为:>.
在天花板上装个吊扇用英语怎么说 Please Please install a fan hanging from the ceiling.请安装一个从天花板吊着的风扇。please install a fan beneath the ceiling.在天花板下边安装风扇。
英语翻译 1.Lights in the bathroom are broken.2.Lights in the main chamber is broken.3.Fan in the main bathroom is broken,ventilation scoop is broken.4.Seiling in the subordinate bathroom is leaking water.5.Light bulb in the living room is broken.6.Sofa need to be assambled