如图所示,长为R的轻杆,一端固定一个小球,使小球P在竖直平面内做圆周运动,关于小球在最高点时的速度V,下列说法正确的是()A.v的最小值为根号下GRB.v由零逐渐增大,向心力也逐渐增大C.v由
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![如图所示,长为R的轻杆,一端固定一个小球,使小球P在竖直平面内做圆周运动,关于小球在最高点时的速度V,下列说法正确的是()A.v的最小值为根号下GRB.v由零逐渐增大,向心力也逐渐增大C.v由](/uploads/image/z/6282522-18-2.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E9%95%BF%E4%B8%BAR%E7%9A%84%E8%BD%BB%E6%9D%86%2C%E4%B8%80%E7%AB%AF%E5%9B%BA%E5%AE%9A%E4%B8%80%E4%B8%AA%E5%B0%8F%E7%90%83%2C%E4%BD%BF%E5%B0%8F%E7%90%83P%E5%9C%A8%E7%AB%96%E7%9B%B4%E5%B9%B3%E9%9D%A2%E5%86%85%E5%81%9A%E5%9C%86%E5%91%A8%E8%BF%90%E5%8A%A8%2C%E5%85%B3%E4%BA%8E%E5%B0%8F%E7%90%83%E5%9C%A8%E6%9C%80%E9%AB%98%E7%82%B9%E6%97%B6%E7%9A%84%E9%80%9F%E5%BA%A6V%2C%E4%B8%8B%E5%88%97%E8%AF%B4%E6%B3%95%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%88%EF%BC%89A.v%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E4%B8%BA%E6%A0%B9%E5%8F%B7%E4%B8%8BGRB.v%E7%94%B1%E9%9B%B6%E9%80%90%E6%B8%90%E5%A2%9E%E5%A4%A7%2C%E5%90%91%E5%BF%83%E5%8A%9B%E4%B9%9F%E9%80%90%E6%B8%90%E5%A2%9E%E5%A4%A7C.v%E7%94%B1)
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