Only 62) A 100 watt motor (60% efficient) is used to raise a 100 kilogram load 5

label Mathematics
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schedule 1 Day
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Oct 5th, 2015

Thank you for the opportunity to help you with your question!

60% of 100w is 100*0.6=60w

w(work)=mgh=100*9.8*5=4900j

P=w/t

=> 60= 4900/t

=> t=4900/60=81.66s

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 6th, 2015

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Oct 5th, 2015
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Oct 5th, 2015
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