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Space Time & Motion A.3 Work Energy and Power (id: 0b584334e)

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admin 发表于 2024-2-8 22:13:10 | 显示全部楼层 |阅读模式
本题目来源于试卷: Space Time & Motion A.3 Work Energy and Power,类别为 IB物理学

[单选题]
An electric motor lifts containers through a vertical distance of $30\,m$.Each container weighs $200\,N$ and takes 60 seconds to lift.If the motor operates at $100N$ and has an efficiency of 40%,what current must be delivered to the motor?

A. $0.25\,A$
B. $0.4\,A$
C. $1.0\,A$
D. $2.5\,A$


参考答案:  D


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