2011年全国中考物理分类汇编考点23_功_机械效率
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5．（2011四川广安，卷I第15题）小均用动滑轮将质量为40kg的货物匀速提高了5m ，他用250N的拉力拉了10s，下列说法正确的是：（g 取10N/kg） ( )
A、有用功为200J B、额外功为500J
C、动滑轮的机械效率为75% D、小均的功率为200W
【答案】B...点击查看全部>>
A、有用功为200J B、额外功为500J
C、动滑轮的机械效率为75% D、小均的功率为200W
【答案】B...点击查看全部>>
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