An Inventor Develops a Stationary Cycling Device by Which an Individual

question 53

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 $\degree$ C to 90 $\degree$ C? (1 cal = 4.186 J, the specific heat of water is 4 186 J/kg · $\degree$ C)

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

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