题目

第二节:课文句子背诵:写在二卷答题纸相应位置上,写在其他地方该题不得分(共10分)(每空一词) 81. People love to① ______ _______to eat, drink and ②______ ______ _____each other. 82.Perhaps he would be able to③__ ___ ____after all and not have to ④______ _____ ______. 83. ⑤______ ______I found myself ⑥______ ______to sea by a strong wind. 84. ⑦______I don’t think it can be a fake. People would ⑧______ ______ _____ _____to a bank note of this amount. 85. However, ⑨________ _______ a widely accepted theory, the universe ⑩________ ____(学有余力同学做,不计入总分)如图所示,设AB段是距水平传送带装置高为H=1.25m的光滑斜面,水平段BC使用水平传送带装置,BC长L=5m,与货物包的摩擦系数为μ=0.4,顺时针转动的速度为V=3m/s.设质量为m=1kg的小物块由静止开始从A点下滑,经过B点的拐角处无机械能损失.小物块随传送带运动到C点后水平抛出,恰好无碰撞的沿圆弧切线从D点进入竖直光滑圆孤轨道下滑.D、E为圆弧的两端点,其连线水平.已知圆弧半径R2=1.0m圆弧对应圆心角θ=106°,O为轨道的最低点.(g=10m/s2,sin37°=0.6,cos37°=0.8)试求:(1)小物块在B点的速度.(2)小物块在水平传送带BC上的运动时间.(3)水平传送带上表面距地面的高度.(4)小物块经过O点时对轨道的压力.
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