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成都市2018届高中毕业班第一次诊
断性模拟检测 理科综合 物理部分
总分110分 时间60分钟
物理试题卷分第I卷（选择题）和第Ⅱ卷（非选择题）。
第I卷 （选择题共42分） 一、选择题 第1卷共7题，每题6分。每题给出的四个选项中，有的只有一个选项、有的有多个选项符合题目要求，全部选对的得6分，选对但不全的得3分，有选错的得0分。 1．在物理学发展史上，伽利略、牛顿等许许多多科学家为物理学的发展做出了巨大贡献。以下选项中符合伽利略和牛顿的观点的是( )
A．人在沿直线加速前进的车厢内，竖直向上跳起后，将落在起跳点的后方
B．两匹马拉车比一匹马拉车跑得快，这说明：物体受力越大则速度就越大
C．两物体从同一高度做自由落体运动，较轻的物体下落较
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慢
D．一个运动的物体，如果不再受力了，它总会逐渐停下来，这说明：静止状态才是物体不受力时的“自然状态”。 2．在如图所示的电路中，灯泡L的电阻大于的内阻r，闭合电键S，将滑动变阻器的滑向左移动一段距离后，下列结论正确的是（ ） A．灯泡L变亮
B．电源的输出功率变大 C．电容器C上的电荷量减少
D．电流表读数变小，电压表读数变大
3．一颗科学资源探测卫星的圆轨道经过地球两极上空，运动周期为T=1.5h，某时刻卫星经过赤道上A城市上空。已知：地球自转周期T0，地球同步卫星轨道半径r，万有引力常量为G，根据上述条件（ ）
A. 可以计算地球的球半径 B. 可以计算地球的质量
C. 可以计算地球表面的重力加速度
D. 可以断定，再经过12h卫星第二次到达A城市上空 4．一物体从地面由静止开始运动，取地面的重力势能为零，运动过程中重力对物体做功W1，阻力对物体做功W2，其它力对物体做功W3，则该过程终态时（ ）
A．物体的动能为W1 ＋W2 B．物体的重力势能为W1
C．物体的机械能为W2 ＋W3 D．物体的机械能为W1 ＋W2 ＋W3
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电源片P