试题与答案

如图甲所示,在长约1m的一端封闭的玻璃管中注满清水,水中放一个圆柱形的红蜡块R,

题型:选择题

题目:

如图甲所示,在长约1m的一端封闭的玻璃管中注满清水,水中放一个圆柱形的红蜡块R,将玻璃管的开口端用胶塞塞紧。将此玻璃管迅速竖直倒置(如图乙所示),红蜡块R就沿玻璃管由管口A上升到管底B。若在将玻璃管竖直倒置、红蜡块从A端上升的同时,将玻璃管向右水平移动(玻璃管的初速度可能为零、也可能不为零)(如图丙~丁所示),直至红蜡块上升到管底B的位置(如图中丁所示)。描出红蜡块的运动轨迹如图戊所示,则红蜡块和玻璃管的运动情况可能是

 

A.红蜡块沿玻璃管向上做匀速运动,玻璃管向右做匀速运动

B.红蜡块沿玻璃管向上做匀加速运动,玻璃管向右做匀速运动

C.红蜡块沿玻璃管向上做匀加速运动,玻璃管向右做匀加速运动

D.红蜡块沿玻璃管向上做匀速运动,玻璃管向右做匀加速运动

答案:

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