The Mechanical Equivalent of Heat Is 1 Cal = 4

question 40

Multiple Choice

The mechanical equivalent of heat is 1 cal = 4.18 J.The specific heat of water is 1 cal/g·K, and its mass is 1 g/cm³.An electric immersion water heater, rated at 400 W, should heat a liter of water from 10°C to 30°C in about:

• A)12 s
• B)50 s
• C)3.5 min
• D)15 min
• E)45 min

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