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 Coloring Page

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 Template

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tomski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 coloring

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

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

在“测�轮组机械效率 的实验中小明用如图甲所示的�轮组进行了五次实验实验数据如下表实验次数物重 G/N 物体上升的高度h/cm 测 sketch template

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

用如图所示甲乙两个�轮组分别提起相同的质量的物体．两个�轮组的动�轮的质量相同不计�擦则A．F甲> F乙η甲>η乙B．F甲 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

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

在“探究影响�轮组机械效率的因素”实验中，某同学用如图20所示的同一�轮组分别做了三次实验，实验数据记录如下：实验次数钩码重/N 钩码上升 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

如图所示四个�轮组如果�轮的重力和一切�擦及丙组的板重不计重物G的重力为600N．要将重物匀速提起四种情况下拉力F分别为F甲= F乙 sketch template

题目某实验小组分别用如图所示的甲乙两个�轮组在相同时间内把重物G提升相同高度F1和F2大小相等不计绳重及�擦下列说法正确的是A sketch template

小明测�轮组机械效率的实验过程如图14所示小明匀速拉动弹簧测力计时弹簧测力计的示数如图丁所示 1根据上面的实验数据计算该�轮组做的 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

工人师傅利用如图所示的�轮组将重为800N的货物匀速提升 08m所用拉力F为320N则工人做的有用功是640640J此�轮组的机械效率 sketch template

如图所示分别用两个�轮组在相同的时间内将重相同的物体G匀速提升相同的高度每个�轮的重均相同．不计绳重及�擦此过程中 A．甲的机械 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

工人用如图甲所示的�轮组运送建材上楼每次运送量不定．�轮组的机械效率随建材重量变化的图象如图乙所示�轮和钢绳的�擦力及绳重忽略不计g 取 sketch template

如图所示皮带传动中O1O2两轮的轴固定当主动轮O1先逆时针转动时不打�的皮带也使从动轮O2逆时针转动试确定两轮边缘上的A点和B点所 sketch template

2．图中画出使用图中所示�轮组提起物体时最省力的绕绳方法——青夏教育精英家教�—— sketch template

测定如图所示的�轮组的机械效率 1实验所需器材除钩码弹簧测力计�轮铁架台外还需要和 2如果将两个1N的钩码匀速提升 sketch template

体重800N的人双脚与地面的接触面积400cm2用图甲所示的�轮组提升物体M已知被提升的物体M重为900N人如在绳子自由端的拉力F将 sketch template

百度教育 sketch template

1画出使杠杆AB在图所示位置静止时所用最小力F的作用点和方�2在图中用线代表绳子将两个�轮连成省力的�轮组要求人用力往下拉绳使 sketch template

在“测量�轮组的机械效率 实验中用相同的�轮分别组装成如图所示的甲乙�轮组．1根据分析可知表格中数据是利用乙�轮测得的此�轮组的 sketch template

题目如图甲所示的装置每个�轮的重力为10N物体A的重力GA=100N物体B的重力GB=40N对A施加水平�右的拉力F=110N使 sketch template

在如图所示的�轮组装置中所挂重物的重力G＝50 N当施加在绳子自由端的拉力为F＝30 N时重物恰好匀速上升绳重及一切�擦均可忽略不计 sketch template

用如图所示的�轮组提升重物所用的拉力是100N动�轮重为80N则用此�轮组能提起 N的重物若将重物提高3m那么绳端要拉过 M．——青 sketch template

用如图所示的�轮组提起重1000N的货物所用拉力是400N绳的自由端被拉下2m．关于这个�轮组工作的下列说法中正确的是 A总功是 sketch template

小敏用如图甲所示的电路图研究通过导体的电流与导体电阻的关系电源电压恒为6V改变电阻R的阻值调节�动变阻器�片保持R两端的电压不变记 sketch template

如图所示甲乙丙丁是四个材料体积形状互不相同的物体图中注明了它们的浮沉情况及其每个物体受到的重力G在图中画出每个物体受到的 sketch template

用如图所示�轮组提升重物．人用50N的拉力F15s内使重为90N的物体匀速上升了3m．不计绳重和�擦求1动�轮的重．2人拉绳子 sketch template

如图所示AB=1mOB=04m当杠杆处于水平静止时弹簧秤的示数为138N右端水中铁块m刚好悬在水中．不计�轮重及�擦．求1F 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

17．如图10所示是一个Z形杠杆请在图中画出重物G受到的重力示意图和力F对支点O的力臂L——青夏教育精英家教�—— 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

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