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2018年高考物理试卷(新课标Ⅰ)(答案)_26.河北-高考真题_2015-2025(河北)物理高考真题

  • 2026-03-07 16:06:05 2026-01-30 00:09:19

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2018年高考物理试卷(新课标Ⅰ)(答案)_26.河北-高考真题_2015-2025(河北)物理高考真题
2018年高考物理试卷(新课标Ⅰ)(答案)_26.河北-高考真题_2015-2025(河北)物理高考真题
2018年高考物理试卷(新课标Ⅰ)(答案)_26.河北-高考真题_2015-2025(河北)物理高考真题

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2018年全国统一高考物理试卷(新课标I) 参考答案与解析 一、选择题 1. 高铁列车动能问题 答案:B 解析: A. 动能与时间平方成正比,不是与时间成正比,故A错误。 B. 根据动能定理F合x=ΔEk,动能与位移成正比,故B正确。 C. 动能表达式Ek=1/2mv²,与速度平方成正比,故C错误。 D. 动能与动量关系Ek=p²/2m,与动量平方成正比,故D错误。 2. 弹簧弹力与位移关系 答案:A 解析: 由牛顿第二定律得F+F1-mg=ma,其中F1=k(x0-x),联立可得F=kx+ma。F与x是线性关系, 且F随x增大而增大,当x=0时F=ma>0,故A正确。 3. 库仑力合成问题 答案:D 解析: 根据受力分析,a、b电荷必须异号才能使c受力平行于ab连线。通过几何关系和库仑定律 计算得qa/qb=64/27,故D正确。 4. 电磁感应电荷量问题 答案:B 解析: 过程I中通过OM的电荷量q1=πBR²/4r,过程II中q2=π(B'-B)R²/2r。由q1=q2解得B'/B=3/2。 5. 外力作用下小球的机械能增量 答案:C 解析: 从a到c根据动能定理:F·3R-mgR=1/2mv²,得v=√(4gR)。离开c后水平位移x=1/2a(√(4R/ g))²=2R。总水平位移L=5R,机械能增量ΔE=F·L=5mgR。 6. 电磁感应与小磁针偏转 答案:AD 解析: 开关闭合瞬间,左边线圈产生感应电流使小磁针 N极向纸里偏转;断开瞬间产生反向电流 使N极向外偏转。保持闭合时无感应电流,小磁针不偏转。 7. 双中子星合并问题 答案:BC 解析: 由 万 有 引 力 提 供 向 心 力 可 得 两 星 质 量 之 和 m1+m2=4π²L³/GT² 。 速 率 之 和 v1+v2=Lω=9.6π×10⁶m/s。无法求质量之积和自转角速度。 8. 电子在等势面中的运动 答案:AB 解析: 由a到d克服电场力做功6eV,可知等势面间电势差2V,平面c电势为0V。电子可能到不 了f平面。经过d时电势能为2eV,b时速率是d时的√2倍。 二、非选择题9. 弹簧劲度系数测量 答案:3.775;53.7 解析: 游标卡尺读数=3.7cm+0.075cm=3.775cm 弹簧伸长量Δx=1.825cm 由mg=kΔx得k=0.100×9.80/0.01825≈53.7N/m 10. 热敏电阻温度特性实验 答案: (1)b (2)图像略 (3)450.0 (4)620.0;33.0 解析: (1)实验前R1滑片应移到b端使电路中电流最小。 (3)由图b可知44.0 对应Rt≈450Ω。 (4)电阻箱读数为620.0Ω,对应温度33.0 。 ℃ 11. 烟花弹爆炸问题 ℃ 解析: (1)初速度v₀=√(2E/m),上升时间t=v₀/g=√(2E/m)/g (2)爆炸过程动量守恒:0=1/2mv₁-1/2mv₂ 能量守恒:E=1/2(1/2m)v₁²+1/2(1/2m)v₂² 解得v₁=√(2E/m) 最大高度h=2E/mg 12. 带电粒子在电磁场中运动 解析: (1)¹H做类平抛运动,x₁=2√3h/3 (2)由几何关系x₁=2r₁sin60°,qvB=mv²/r₁得B=√(6mE/qh) (3)²H在磁场中运动半径r'=√2r₁/2,离开磁场位置距O点距离d=2√3(√2-1)h/3 三、选考题 13. 理想气体状态变化 答案:BDE 解析: A.过程①等容升温,压强增大。 C.过程④等容降温,气体放热。 E.状态d的V/T值大于b,压强小于b。 14. 气缸液体流入问题 解析: 对上方气体:p₀V/2=p₁(13V/24) 对下方气体:p₀V/2=p₂(V/3) 活塞平衡:p₂S=p₁S+mg 解得m=15p₀S/26g 15. 光的折射 答案:√3;大于 解析:红光折射率n=sin60°/sin30°=√3 蓝光折射率更大,相同入射角时折射角更大。 16. 简谐横波问题 解析: (i)波长λ=36cm,周期T=2s,波速v=18cm/s,沿x轴负方向传播 (ii)由振动方程和传播时间可得x_Q=9cm
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  1. CONNECT:[ UseTime:0.000632s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000619s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.027252s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011185s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000608s ]
  6. SELECT * FROM `set` [ RunTime:0.000435s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000654s ]
  8. SELECT * FROM `wendang` WHERE `id` = 77293 LIMIT 1 [ RunTime:0.000722s ]
  9. UPDATE `wendang` SET `liulancishu` = 9 WHERE `id` = 77293 [ RunTime:0.029811s ]
  10. UPDATE `wendang` SET `lasttime` = 1773113284 WHERE `id` = 77293 [ RunTime:0.007726s ]
  11. SELECT * FROM `wendang` WHERE `id` < 77293 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009091s ]
  12. SELECT * FROM `wendang` WHERE `id` > 77293 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004150s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 77293 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019521s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 77293 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015761s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 77293 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002426s ]
0.203891s