Answer:
\[P=200\,W\] \[t=1\,\min =60s\] \[W=?\] \[Efficiency=\frac{Output\,\,power}{Input\,\,power}\] \[\frac{60}{100}=\frac{\frac{w}{t}}{200}\] \[w=\frac{200\times 60\times 60}{100}-7200\,J\]
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