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

question 41

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 210 g water (enough for 1 cup of coffee) is to be heated in 14.0 min from 26.0°C to 84.0°C? (1 cal = 4.186 J,the specific heat of water is 4 186 J/kg⋅°C)

• A)3 640 W
• B)289 W
• C)60.7 W
• D)850 W
• E)42.5 W

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