2022英语周报答案高考第39期

第三节One possible version:Paragraph 1After reading the diary, the son was filled with tearsand began to reflect on the days when he used to sitogether with his father. His father would patiently answerthe same question all 23 times without feeling irritationwhile his father asked him the same question just fourtimes! The son thought to himself: If I attain old age, howwill my son look at me? Will he think of me as a burden?Will he shout at me because of my poor sight, poor hearingor poor understanding?

15【解析】(1)物块在木板上滑行的过程中,设水平向右为正方向,对物块木板和凹槽组成的系统由动量守恒定律得mv0=mh (M1 M2)v(2分)由能量守恒定律得2m2v6=mn (M1 M2)n十mgL(2分)联立解得v1=4m/s,L=0.8m(1分)(2)物块在凹槽上滑行的过程中,物块和凹槽组成的系统水平方向不受力,因此水平方向动量守恒,当物块和凹槽共速时物块上升到最高点,由动量守恒定律得mU M2 v2=(m M2)v(2分)物块和凹槽组成的系统机械能守恒,由机械能守恒定律得2mmvit2M2vi=2(m M)v mgh (2 41)联立解得h=0.15m(1分)

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