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如图,粗细均匀、两端开口的U形管竖直放置,两管的竖直部分高度为20cm,内径很小,水平部分BC长14cm.一空气柱将管内水银分隔成左右两段.大气压强P0=76cmHg.当空气柱温度为T0=273K、长为L0=8cm时,BC管内左边水银柱长2cm,AB管内水银柱长也为2cm.求:(1)右边水银柱总长是多少?(2)当空气柱温度升高到多少时,左边的水银恰好全部进入竖直管AB内?(3)为使左、右侧竖直管内的水银柱上表面高度差最大,空气柱温度至少要升高到多少?
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