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OpenStudy (anonymous):
a 5000W heater i used to heat water. How long will it take to heat 20kg water from 20C to 100C?
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OpenStudy (mathmate):
Energy required =20*1000 g (100-20)*4.184 joules =6694400 joules Time required =6694400/5000 =1339 seconds =22min. 19 seconds
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