018-2022英语周报八年级外研第21期答案

33.(15分)(1)吸(2分)2×10°(3分)(2)(10分)(i)设未加热前右侧气体的压强为P,管道的横截面积为S,以活塞为研究对象,由平衡条件有P0S+ mosin30。=pS(2分)解得p=1.2×103Pa(2分(i)当活塞位于最低点时,P左=P右(1分)设加热后左侧气体的温度为T,四分之一圆弧的长度为L,对左侧气体,由理想气体状态方程有T(2分)对右侧气体,由于气体温度不变,由玻意耳定律有p(2L-a0。L)S=P右LS(2分)解得T=720K(1分)

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