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

question 13

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 20 $\degree$ C to 95 $\degree$ C? (1 cal = 4.186 J,the specific heat of water is 4 186 J/kg* $\degree$ C)

• A)94 000 J
• B)22 000 J
• C)5 400 J
• D)14 J

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