7．用图3所示的�轮组将重为10n的物体匀速提升01m拉力f＝6n在这一过程中下列说法正确的是 A．拉力所做的有用功为1j B．拉力 Sketch Coloring Page

7．用图3所示的�轮组将重为10n的物体匀速提升01m拉力f＝6n在这一过程中下列说法正确的是 A．拉力所做的有用功为1j B．拉力 Template

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anonymous

anonymous
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anonymous

anonymous
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anonymous

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anonymous

anonymous
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anonymous

anonymous
sketch #4918 Mike Wazowsky by George Andres Crowther Castillo

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Renjith Raj
sketch #1614 uncle bun

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anonymous

anonymous
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anonymous

anonymous
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anonymous

anonymous
sketch #3459 BLUE from fosters imagenary friends

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Marlyn Ortiz
sketch #2029 GOD 'S PROMISE ...

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anonymous

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anonymous

anonymous
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anonymous

anonymous
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anonymous

anonymous
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anonymous

anonymous
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anonymous

anonymous
sketch #5113 Growlithe and Arcanine by Kervinzitho del Piero

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anonymous

anonymous
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tomski7．用图3所示的�轮组将重为10n的物体匀速提升01m拉力f＝6n在这一过程中下列说法正确的是 a．拉力所做的有用功为1j b．拉力 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

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

如图5所示O1为皮带传动装置的主动轮的轴心轮的半径为r1O2为从动轮的轴心轮的半径为r2r3为与从动轮固定在一起的大轮的半径已知 sketch template

如图5所示的皮带传动装置中轮A和B同轴ABC分别是三个轮边缘上的质点且rA=rC=2rB则三个质点的�心加速度之比aAaBaC sketch template

如图所示两个�属轮A1A2可绕通过各自中心并与轮面垂直的固定的光��属轴O1和O2转动O1和O2相互平行水平放置每个�属轮由四根 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

如图甲所示是某建�工地利用�轮组和卷扬机提起重物的示意图．已知匀速提起质量为m=90kg建�材料时卷扬机对绳的拉力为F�轮组的机械效率为η sketch template

24．如图7所示物体挂在弹簧测力计下用力的示意图表示出物体所受拉力的三要素——青夏教育精英家教�—— 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

12．用如右图所示�轮组甲和乙提起同样重的物体时甲�轮组的机械效率为η甲乙�轮组的机械效率为η乙则可判定η甲 η乙．如果用乙�轮组第一次 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

如图所示为两级皮带传动装置转动时皮带均不打�中间两个轮子是固定在一起的轮1的半径和轮2的半径相同轮3的半径和轮4的半径相同且为轮1和 sketch template

如图所示是皮带传动的示意图O1是主动轮O2是从动轮两轮水平放置当O1顺时针匀速转动时重10N的物体同皮带一起运动若物体与皮带之间的 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

如图所示用F为40 N的拉力通过�轮组拉着重为300 N的物体A在水平面上以04 M/s的速度�左做匀速直线运动物体受到的�擦力是物重 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

分别用如图所示的两个�轮组在10s内将重为400N的物体G匀速提升1m每个�轮的重均为20N不计绳重及�擦此过程中下列说法正确的是 sketch template

10．用图所示的�轮组水平拉动重为100N的物体以05 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

7．用图3所示的�轮组将重为10N的物体匀速提升01m拉力F＝6N在这一过程中下列说法正确的是 A．拉力所做的有用功为1J B．拉力 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

$如图所示为皮带传动装置皮带轮的圆心分别为OO′AC为皮带轮边缘上的点B为AO连线上的一点．RB=$frac{1}{2}$RA sketch template$

如图所示是皮带传动的示意图O1是主动轮O2是从动轮两轮水平放置当O1顺时针匀速转动时重10N的物体同皮带一起运动若物体与皮带之间的 sketch template

如图甲所示的�轮组将一个重78牛的铁块A匀速提升2米拉力F1做功是200焦g取10N/kg求1该�轮组的机械效率．2若将铁块 sketch template

题目用如图所示的�轮组从水中提升物体A物体A完全在水面下匀速竖直上升的过程中卷扬机在绳子自由端竖直�下的拉力为F�轮组的机械效率为 sketch template

如图所示用该�轮组提起重为320N的物体时绳子自由端的拉力F=200N．1该�轮组的机械效率为多�2若被提的重物改为G sketch template

如图所示弹簧秤A和B及�轮组均处于静止状态F=10牛若不考�秤重�轮重及�擦弹簧秤A和B的示数应别为 A30牛和30牛 B sketch template

如图所示的�轮组可忽略绳重和�擦．用弹簧测力计竖直�上匀速拉动绳端将重为6N的物体提升20cm弹簧测力计的示数如图所示则拉力做的功为1 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=06m²，物体浸没在水中时水面高度为100cm，当物体 sketch template

分别用如图所示的两个�轮组将同一物体提升到相同高度．若物体受到的重力为100N动�轮的重力为10N．把物体匀速提升1m的过程中下列说法不 sketch template

如下图所示建�工人用�轮组提升重为220 N的泥桶动�轮重为20 N不计�轮与轴之间的�擦及绳重．若工人在5 S内将绳子匀速�上拉6 M 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 08m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

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

作图题1图所示重10N的物体静止在斜面上请画出该物体所受重力的示意图．2画出图所示的折射光线的入射光线．题目和参考答案——青夏教育 sketch template

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