12. With significant effort(!), an ordinary person on a bicycle can produce abou

Question

12. With significant effort(!), an ordinary person on a bicycle can produce about 250 watts of electricity on a stationary bicycle. A company, in order to encourage physical fitness while at the same time conserving electrical energy, is requiring employees to heat up their cup of hot beverage by the use of an electrical heater powered by a stationary bicycle generator. How long does the employee have to pedal the bicycle to heat 250 grams (a small cup) of water from 20 C to 80 C?

A. 30 seconds B. 1 minute C. 2 minutes
D. 4 minutes E. 8 minutes

Explanation / Answer

heat energy=Cp*m*(T2-T1) 250*t=1*250*60 t=60 sec =1min

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