河北省遵化市2018_2019学年高一物理上学期期中试题(扫描版).doc

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12345672018-2019高一物理上学期期中考试答案1.C2.D3.D4.B5.D6.A7.D8.C9.C10.D11.A12.C13.BD14.CD15.BD16AB17、(1) Tx254 、 0.280 (2)略 (3)匀加速直线或匀变速18解:(1)据运动学公式 axv20得 sm/140(2)据运动学公式 t得 t=2s19解:(1)电梯上升的加速度2/5.0smtva(2)最后 4秒上升的距离13tx= =6m(3)匀加速位移 tvx921匀速位移 m42匀减速位移 x63总位移为 921,该同学位于楼层为 13层20(1)花盘从 47 高处落下,到达离地面高 2 的车顶过程中,位移为 45m,根据位移公式,有 2gth,解得 sght33秒内汽车位移: mvs4 故刚好落在车头上,即汽车不能安全通过(2)如果在汽车车头距花盘的水平距离为 16米时才看到,该汽车经过时间:st18640反应时间 t5.,在反应时间内仍然是匀速直线运动,此后做匀加速直线运动,故反应时间内的位移: mtvx41 结合位置关系知,加速位移: Lx1502又 02 )()(ttattvx其中 s3联立解得: 2/8sm

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