本题目来源于试卷: Fluid Mechanics，类别为 美国物理杯赛(Physics Bowl)
[单选题]
12.21: A child’s ballqr0 2bgcylg1fs- ca06 tc q-x.oon is filled with pure Xenon gas. This balloon thgulyo bs,5-d-vo9 a.ken is released from rest two meters above the ground on Earth. Which one of the following choices d-5 vy9,-. ukglsabo obest describes the response of the balloon?
A. The balloon immediately falls toward the ground.
B. The balloon floats gently in the air, finally reaching the ground after several minutes.
C. The balloon floats gently in the air, essentially hovering at the same height for at least a day.
D. The balloon very, very slowly and gently rises upward.
E. The balloon rapidly rises into the sky.
参考答案: A
本题详细解析:
暂无
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