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[物理选修3-3模块](15分) (1)(5分)一定质量的非理想气体体积膨胀对外做了4×10 3J功的同时,又从外界吸收了2.4×10 3J的热量,则在该过程中,气体内能的增量△ U=______J,气体的分子势能和分子动能分别__________、________(填“增加”“减小”或“不变”)。 (2)(10分)如图所示,一圆筒形汽缸静止于地面上,汽缸的质量为 M,活塞(连同手柄)的质量为 m,汽缸内部的横截面积为 S,大气压强为 p 0,平衡的汽缸内的容积为 V。现用手握住活塞手柄缓慢向上提。设汽缸足够长,在整个上提过程中气体的温度保持不变,不计汽缸内气体的重力与活塞与汽缸壁间的摩擦,求汽缸刚提离地面时活塞上升的距离。
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