广西宾阳县宾阳中学2018-2019学年高一上学期期中考试物理段考参考答案.doc

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1、宾阳中学 2018年秋学期段考高一 物理科参考答案1 2 3 4 5 6 7 8 9 10 11 12B C D D A A B B AC BC ACD AD13.(每空 2分) ABDCFE ; A C 2.58 14.(每空 2分) A C ; 9.75 偏大 15(1)由 v-t图可知,第 4s内做匀速运动,位移 第 x4=vt=61m=6m 2分(2)前 6s的位移等于前 4s内的位移,为 , 1 分6=2+42 6=18前 6s的平均速度 1分=66=186=3/前 6s内的路程为 , 1 分s=12(2+5)6+1216=24m前 6s内的平均速率 1分v=st6=246=4m/s

2、3) 画出对应的 a-t图象如图 4分16、 (14 分)由于加速时加速度和减速时加速度大小相等,则加速时间和减速时间相等,加速位移和减速位移相等。设准时出站时,匀速行驶时间为 t1,加速运动时间为 t1,由匀变速直线运动规律可得:2分3分因故晚出发时,设匀速行驶时间为 t2,加速运动时间为 t2,由匀变速直线运动规律可得:savt50112tvxt2= v2/a=60s (2 分)x=2 1at22+v2t2 (3 分)根据题述,两次均正点到 达,则 2 t1+t1=2 t2+t2+ t0 (3 分)联立上述所有式子,解得 A 、B 两站间的 距离 x=57km (1 分)(此题正确使用图像法解题也给分)17.(16 分)解:(1)水滴下落至窗台通过的距离为 H=3.2m由 v 2=2gH 3分得 =8 m/s 3分故水滴到达窗台的速度大小为 8m/s(2)水滴下落至窗户上边缘的时间为3分水滴下落至窗台的时间为3分 水滴经过窗户的时间为t=t 2t 1=0.8s0.6s=0.2s 4 分故水滴经过窗户的时间为 0.2s

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