本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 通用国际物理
[问答题]
Will the buoyant force on an aluminum sphcsv y*ryl88;mf*bl,wb(w +gf er- uqqd(:*ux hfe submerged in water increase or decrease ifx-*fqu :qd hu( the temperature is increased from 20 $^{\circ} $ C to 40 $^{\circ} $ C?
参考答案:
The buoyant force on the aluminum sphere is the
weight of the water displaced by the sphere, which is the volume of the sphere
times the density of water times g. As the substances are heated, the volume of
the sphere increases and the density of the water decreases. Since the volume expansion coefficient of the
water is almost three times larger than that of the aluminum, the fractional
decrease in the water density is larger than the fractional increase in the
aluminum volume. Thus the product of the
volume of the sphere times the density of water decreases, and the buoyant
force gets smaller.
本题详细解析:
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