The two objects in thermal contact with each other, are in thermal equilibrium w
ID: 1503571 • Letter: T
Question
The two objects in thermal contact with each other, are in thermal equilibrium when the two masses are equal the two objects reach the same temperature. the temperature of the first object is less than the temperature of the second. the temperature of the first object is more than the temperature of the second. The specific heat of water is 1.0 cal / g C degree Write (in two lines only) the meaning of above statement. How many calories of heat energy would it take to heat 300 mL of water from 20 degree C to 80 degree C if the specific heat capacity of water is 1.0 cal / g. C degree ? How long would it take to heat the water in [9] using a heater with a power rating of 100 Watts? (specific heat of water = 4186 J / kg. C degree) Show your calculationsExplanation / Answer
8)
1 calorie/gram °C = 4.186 joule/gram °C
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius
9)
calorie = 4.18 Joule
specific heat of water is 4.186 kJ/kgC
200 mL = 0.1 kg
energy = 4.186 kJ/kgC x 0.1 kg x 60ºC = 25.1 kJ
10)
energy = 4.186 kJ/kgC x 0.1 kg x 60ºC = 25.1 kJ
power = energy per unit time
100 J/s = 25.1 kJ / t
t = 251 seconds
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