An Inventor Develops a Stationary Cycling Device by Which an Individual,while

question 18

Multiple Choice

An inventor develops a stationary cycling device by which an individual,while pedaling,can convert all of the energy expended into heat for warming water.What minimum power must be generated if 300 g of water (enough for 1 cup of coffee) is to be heated in 10 min from 30°C to 90°C? (1 cal = 4.186 J,the specific heat of water is 4 186 J/kg · °C)

• A) 9400 W
• B) 590 W
• C) 160 W
• D) 130 W

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