试题与答案

竖直放置两端封闭的玻璃管内注满清水和一个用红蜡做成的圆柱体,玻璃管倒置时圆柱体能

题型:选择题

题目:

竖直放置两端封闭的玻璃管内注满清水和一个用红蜡做成的圆柱体,玻璃管倒置时圆柱体能匀速运动,已知圆柱体运动的速度大小为5cm/s,与水平方向成q=53°,如图所示,则玻璃管水平方向运动的速度为(sin53°=0.8  cos53°=0.6)

A.5cm/s

B.4cm/s

C.3cm/s

D.无法确定

答案:

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