[今日更新]安徽省泗县2023-2024学年度第一学期七年级期末质量检测.物理试卷答案

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[今日更新]安徽省泗县2023-2024学年度第一学期七年级期末质量检测.物理试卷答案试卷答案

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13.(10分)如图,粗细均匀的L形导热细玻璃管固定在竖直面内,竖直部分,AB上端封闭,长为50cm,过水银柱在管内封闭一段长为25cm的理想气体,水平部分BC左端开口,管内的水银柱总长为30cm,水银柱左侧面到C端的距离为20cm,已知大气压强为75cmHg,,环境温度为300K(1)若环境温度缓慢升高到396K,求水银柱左侧面向左移动的距离:(2)若保持环境温度300K不变,将玻璃管C端用活塞封闭,并缓慢向右推动活塞,当水银全部进人竖直管时,求活塞移动的距离(结果保留2位有效数字)。

1.如图甲所示的重力场中重力做功与重力势能的变化,可类比如图乙所示匀强电场中电场力做功与电势能的变化,下列说法正确的是3A.对于电场强度B.由甲、乙图可知,重力做功与路径无关,电场力做功与路径有关E=Fq,E与F、q均无关系,对重力加速度g=Gm,g与G、m均有关系C.用电场力做功来定义电势差UAB=WABq,hAB=WGmg同理可用重力做功来定义高度差D.重力做正功时重力势能减小,电场力做负功时电势能可能减小

13.(11分)如图所示,某人拉着总质量M=14kg的旅行箱在水平地面上做匀速运动。已知旅行箱受到的阻力大小始终等于地面对旅行箱支持力的18,,人对旅行箱的作用力可以近似认为始终沿拉杆方向,取重力加速度大小g=10m/s^2,53^=0.8。(1)若拉杆与水平地面间的夹角为53^,,求人对旅行箱的作用力大小F1;(2)增加拉杆的长度,使拉杆和水平地面成37^角,求人对旅行箱的作用力大小F2.