用如图所示�轮组匀速提升重为200n的物体人对绳的拉力为125n不计绳重和�擦�轮组的机械效率为．如果人的体重为600n拉动过程中绳 Sketch Coloring Page

用如图所示�轮组匀速提升重为200n的物体人对绳的拉力为125n不计绳重和�擦�轮组的机械效率为．如果人的体重为600n拉动过程中绳 Template

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tomski用如图所示�轮组匀速提升重为200n的物体人对绳的拉力为125n不计绳重和�擦�轮组的机械效率为．如果人的体重为600n拉动过程中绳 coloring

30．如图所示用�轮组提起重G的物体绳子自由端拉力为F重 物以速度勘匀速上升不计�擦和绳重则 1�轮组的机械效率为 2 sketch template

某人用如图所示的�轮组匀速提升500N的重物所用的拉力F为300N 绳子自由端被拉下2m在此过程中求�拉力F所做的功 ��轮组的 sketch template

用如图所示�轮组将一物体匀速提高2m已知拉力大小恒为60N方�总保持竖直�上动�轮的质量为3kg绳重和�擦均不计．求1物体所受 sketch template

如图所示人用50N的力推木箱前进画出该推力的示意图．题目和参考答案——青夏教育精英家教�—— sketch template

如图甲所示，利用�轮组匀速竖直�上提升物体M，已知M受到的重力为400N1做的功为W1 ， 拉力F2做的功为W2 W1和W2的大小如图乙所 sketch template

用如图所示的�轮组将物体�左移动A B两个�轮中A是 �轮B是 �轮在不考��轮重和�擦时物体与桌面的�擦力是90N匀速移动物体 sketch template

如图所示是小明同学测�轮组机械效率的实验装置图．他在2s内做了2．4J的有用功使重物匀速上升了0．4m不计绳重及�擦．请你回答 1弹簧 sketch template

63．工人用如图所示的�轮组提升重物在10s内将240N的物体匀速提升2m已知工人的拉力为100N不计绳重与�擦阻力求 1工人 sketch template

某人用如图15所示的�轮组吊起一个重1000N的物体�轮组的机械效率为80%他在5s内使绳子自由端移动8m求 1物体上升的高度和 sketch template

题目搬运工人站在水平高台上用如图所示的�轮组匀速竖直�上提升重物不计�轮组的绳重和�擦工人的重力为640N与地面接触的总面积为提升 sketch template

如图所示用�轮组将密度为 28×103kg/m3质量为56kg�属块完全在水中匀速提升05m加在绳子自由端的拉力是F动�轮重120N sketch template

用如图所示的�轮组提升重为G=3200N的重物当重物以05m/s的速度匀速上升时拉力F的功率是2000W．忽略�擦和绳重．求1动�轮 sketch template

百度教育 sketch template

10．用相同的定�轮和动�轮组成甲乙两个�轮组如图8所示用它们来提升同一重物甲�轮组将重物举高1m乙�轮组将重物举高2m在不计绳 sketch template

分别用图甲乙丙所示的�轮组匀速提起同一重物G时所用的拉力分别为F1F2和F3若不计�轮重及�擦这三个力的关系为 A．F1＜F2 sketch template

用如图所示�轮组匀速提升重为200N的物体人对绳的拉力为125N不计绳重和�擦�轮组的机械效率为 ．如果人的体重为600N拉动过程中绳 sketch template

如图所示的�轮组拉动物体A沿水平地面匀速前进已知物体A的重力为500N拉力大小为50N则物体与地面间的�擦力f=150150N若物体 sketch template

如图所示甲乙两个�轮组通过细绳悬挂在天花板上用�轮组匀速提升重为600N的物体时悬挂甲乙两�轮组的细绳所受的拉力分别为F甲F乙 sketch template

如图甲所示轮轴实质是一种杠杆．小捷同学为了探究轮轴的平衡条件进行了如下实验实验一如图乙所示重物G通过细绳绕在轴上在轮的边缘沿切线 sketch template

1如图所示物体A静止在水平地面在图中画出它所受的力的示意图．2用如图所示的�轮组提升重物若拉力F将绳子的自由端移动1m时重物 sketch template

用四个�轮和两根相同的绳子组成如图所示的甲、乙两个�轮组用它们匀速提起货物在绳自由端施加竖直的拉力分别为F甲和F乙物重分别为G甲和G乙 sketch template

59．如图所示物重G为600N用�轮组将重物匀速提升5m所用拉力F为250N�轮组的机械效率为 ．若不计�擦被提升的物重增加时�轮 sketch template

用如图所示的�轮组提升物体A在匀速竖直提升物体A的过程中卷扬机加在绳子自由端竖直�下的拉力F为400N物体A上升的速度vA为01m/s sketch template

如图所示用�轮组提起重900N的物体绳子自由端拉力F为400N重物在20s内匀速上升了10m求1提起重物所做的有用功．2拉力 sketch template

如图所示的�轮组不计绳重及�擦重物G=100N当拉力F=40N时重物刚好匀速上升则动�轮重 N当重物上升05m时拉力F端上升 sketch template

用如图所示的�轮组匀速提升浸没在水中的物体，已知G=3900N。圆柱形容器底面积S=06m²，物体浸没在水中时水面高度为100cm，当物体 sketch template

用如图所示的�轮组将重100N的物体匀速提升02m所用时间为2s作用在绳子末端的拉力F为60N不计绳重和绳与�轮间的磨擦下列计算 sketch template

用如图所示的�轮组从15m深的水中提起底面积为200cm2高2m的圆柱形实心物体已知该物体的密度为25×103kg/m3力F作用的绳子 sketch template

在图所示的�轮组中用110N的力在5s内把重为200N的物体匀速提高2m则 A．对重物做的有用功约为200J B．�轮组的机械效率约为90 sketch template

10．用图所示的�轮组水平拉动重为100N的物体以05 M／s的速度在水平地面上匀速运动若物体受到的�擦力为60 N不计机械自重和�擦 sketch template

用如图所示的�轮组匀速提升重为100N的物体拉力F=60N�轮组的机械效率为 在物体匀速上升的过程中物体的动能 物体的重力势能选 sketch template

某人通过如图所示的�轮组用2N的拉力F将物体M匀速提升了01m的距离若M重42N则有用功为042J此�轮组的机械效率为70% sketch template

用如图所示的�轮组提升重物人用500N的拉力F在20s内使重为800N的物体匀速上升了3m．不计绳重和�擦则人拉绳子做功的功率和�轮组的 sketch template

小明利用如图所示的�轮组将重为900N的物体从一楼匀速提升到六楼所用的拉力为360N绳子自由端移动的速度为03m/s．求1小明所用 sketch template

如图所示用�轮组提起一个密度为25×103kg/m3体积为004m3的石块作用在绳子自由端的拉力F为400N石块在20s内匀速上升 sketch template

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