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°C to 90°C? (1 cal = 4.186 J,the specific heat of water is 4186 J/kg · °C)
A) 94,000 J
B) 75,000 J
C) 5400 J
D) 14 J

Question

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The Answer of 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°C to 90°C? (1 cal = 4.186 J,the specific heat of water is 4186 J/kg · °C)
A) 94,000 J
B) 75,000 J
C) 5400 J
D) 14 J

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