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2022年湖南省普通高中学业水平合格性考试模拟试卷（长郡版）物理参考答案一、选择题：本题共18小题，每小题3分，共54分。在每小题给出的四个选项中，只有一项是符合题目要求的。题号123456789答案DBBDBDCDA题号1011

12131415161718答案CCBDDABDD二、实验题：本题共3小题，每小题4分，每空2分，共12分。19．（1）C（2）D20．0.020.7521．4001000三、计算题：共3小题，共34分，解答应写出必要的文字

说明、方程式和重要的演算步骤，否则不得分。22．（10分）【解析】（1）物体做匀加速直线运动，根据加速度的定义式vat=··················································

···············································2分得1042a−=m/s2=3m/s2············································································1分

（2）根据位移公式02vvxvtt+==····························································2分得41022x+=m=14m··············································

······························2分（3）根据牛顿第二定律F=ma····································································2

分得F=2×3N=6N························································································1分23．（10分）【解析】（1）在外电路，电流方向由电源正极流向电源负极，故流过电阻R1的

电流方向是从a到b·················································································3分（2）将滑动变阻器滑片P向右移动少许，电路中的电阻增大，电流减小

，根据焦耳定律可知，电阻R1在相同时间内产生的热量将减小·················································3分（3）根据21PIR=热··················

······························································2分20.150P=热W=0.5W······················································

······················2分24．（14分）【解析】（1）小球在C处的动能为0，故小球在C处的机械能等于其重力势能011002J02JEmgh===...·····························

···································4分（2）小球在摆动过程中，不计空气阻力，只有重力做功，满足机械能守恒，即212mvmgh=·······························

··························································4分解得22100.2vgh==m/s=2m/s·······················································2分

（3）重力做功与路径无关，因A与C等高，故小球从A摆到C的过程中，重力对小球所做的功0W=．······················································································4分获得更多资源请扫码加

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