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Published bySharyl Perkins Modified over 9 years ago
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Final Exam Review Thermodynamics Heat & Conservation of Energy Heat Transfer
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What is heat? Def: The amount of internal ENERGY (Q) an object’s molecules have. More heat = more energy
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Comparing Heat Energy Heat 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.
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Changing heat energy Changing the temperature of an object will increase or decrease the heat energy. Formula: Q = mcΔT Heat Energy (J) = mass(kg) * specific heat(J/kg˚C)* Δ temp (°C)
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Example The specific heat of aluminum is 900 J/kg°C. How much heat energy does it take to raise the temperature of a 1kg softball bat from 37°C to 40°C?
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Example The specific heat of aluminum is 900 J/kg°C. How much heat energy does it take to raise the temperature of a 1kg softball bat from 37°C to 40°C? Givens: m= 1kg c= 900 J/kg°C ΔT= 40°C – 37°C = 3°C
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Example The specific heat of aluminum is 900 J/kg°C. How much heat energy does it take to raise the temperature of a 1kg softball bat from 37°C to 40°C? Givens: m= 1kg c= 900 J/kg°C ΔT= 40°C – 37°C = 3°C Q = mc ΔT
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Example The specific heat of aluminum is 900 J/kg°C. How much heat energy does it take to raise the temperature of a 1kg softball bat from 37°C to 40°C? Givens: m= 1kg c= 900 J/kg°C ΔT= 40°C – 37°C = 3°C Q = mc ΔT Q = (1kg)(900J/kg°C)(3°C) = 2700 J
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Practice Complete the worksheet provided for classwork. ?
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