2022高一英语周报下学期50期答案

16.答案:(1)225cm(2)400K12J解析:(1)未挂上重物前,对活塞由平衡条件得:p05=p1S mng挂上重物后,对活塞由平衡条件得:PS=p2S (mo m)g(1分)一设稳定后活塞与气缸底部之间的距离为x(1分)该过程中气体初末状态的温度不变,根据玻意耳定律有:p1S5=p25x一代入数据解得:x=22.5cm(1分)(2)加热过程中气缸内压强不变,当活塞移到距气缸口时,设此时温度为T(1分)根据盖一吕萨克定律有:=5x1解得T2=400K加热过程中气体对外做功W=P2(x1-x)S分)代入数据得W=12J(1分

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

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