An Inventor Develops a Stationary Cycling Device by Which an Individual

question 10

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. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 30 $\degree$ C to 90 $\degree$ C? (1 cal = 4.186 J, the specific heat of water is 4186 J/kg · $\degree$ C)

• A) 94,000 J
• B) 75,000 J
• C) 5400 J
• D) 14 J

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