The Mechanical Equivalent of Heat Is 1 Cal = 4

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