2023年衡水金卷先享题分科综合卷 新教材二理综 答案

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21.I)物休做初速度为零的匀加速直线运动出位移公式可得x一专f(1分)解得a=3ms2(1分》对物体，山牛顿第二走律得Fcs3)°一x(mg一Fsin3)一n(1分)解得u一号(1分)(2》撤去拉力时，物休的速度=t一23ms(1分)撒去拉方后，由牛顿第二定律得ung-ma解得4'-10y图3s(1分)由匀变速运动的速度位移公式得物体的位移x'_0一矿_3-2a’5m1.04m.(1分)(3》设拉力F与水平地血的夹角为日，物体必在水平地血上运动，则0s日一F:?〔1分)F:=xF、(1分)在竖直方向上，山平衡条件得F、十Fsin一ng〔1分)【2U22冲刺预测·理综参考答案第2页YX】解得P&次gcos日fsin8(1分)出数学知识得：0s+至、22sim(60十.当0=30时，拉力F最小，最省力.(1分》

【答案】56.Because she got fed up with too much paperwork and travelling.Or:Because it involved too much paperwork and a lot of travelling.Or:Because she was tired of too much paperwork and travelling.57.Be scheduled/intended/meant/certain for.58.Her volunteer experience and her friend's encouragement.59.She earns less but works more happily than before.Or:She earns less but becomes richer in many ways.60.I will choose a job that is related to my interest because the love for job brings the real happiness.