本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 IB物理学
[问答题]
Will a grandfather c3ny +9s)atl 9k4znvuslock, ac zojv3.ct,b.ka1/tq hrb c+0ccurate at 20 $^{\circ} $ C, run fast or slow on a hot day (30 $^{\circ} $ C)? Explain. The clock uses a pendulum supported on a long, thin brass rod.
参考答案:
On a hot day, the pendulum will be slightly longer than at 20$^{\circ} $C, due to thermal expansion. Since the period of a pendulum is proportional to the square root of its length, the period will be slightly longer on the hot day, meaning that the pendulum takes more time for one oscillation. Thus the clock will run slow.
本题详细解析:
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