Final Exam Review
Final Exam ReviewThermodynamicsHeat & Conservation of
EnergyHeat Transfer
What is heat?Def: The amount of internal ENERGY (Q) an objects
molecules have.
More heat = more energy
Comparing Heat EnergyHeat energy is effected by two things:1)
Mass- 10kg of steel at 100 degrees has more energy than 5kg of
steel at 100 degrees.
2) Temperature- 5 kg of water at 100 degrees has more energy
than 5 kg of water at 50 degrees.
Changing heat energyChanging the temperature of an object will
increase or decrease the heat energy.
Formula: Q = mcTHeat Energy (J) = mass(kg) * specific
heat(J/kgC)* temp (C)
ExampleThe specific heat of aluminum is 900 J/kgC. How much heat
energy does it take to raise the temperature of a 1kg softball bat
from 37C to 40C?
ExampleThe specific heat of aluminum is 900 J/kgC. How much heat
energy does it take to raise the temperature of a 1kg softball bat
from 37C to 40C?Givens: m= 1kg c= 900 J/kgC T= 40C 37C = 3C
ExampleThe specific heat of aluminum is 900 J/kgC. How much heat
energy does it take to raise the temperature of a 1kg softball bat
from 37C to 40C?Givens: m= 1kg c= 900 J/kgC T= 40C 37C = 3CQ = mc
T
ExampleThe specific heat of aluminum is 900 J/kgC. How much heat
energy does it take to raise the temperature of a 1kg softball bat
from 37C to 40C?Givens: m= 1kg c= 900 J/kgC T= 40C 37C = 3CQ = mc
TQ = (1kg)(900J/kgC)(3C) = 2700 J
PracticeComplete the worksheet provided for classwork.
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