heat transfer (physics)
TRANSCRIPT
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HEAT TRANSFER
the study of heat flow within an object and from one object to another due to different temperature.
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THREE FORMS :
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1.RADIATIONHeat energy travels as electromagnetic waves
in the same manner and speed as light.
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2. CONDUCTION
Heat energy travels when two objects at different temperature are in direct contract with each
other. During heat conduction, vibrating
atoms / molecules excite the atoms or molecules next to them.
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3. CONVECTION
the heat fluids is transferred to cooler regions by current.
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SPECIFIC HEAT
the amount of energy required to raise the
temperature of 1kg. of a substance by 1k.
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J / KG. K = UNIT OF
MEASURE FOR SPECIFIC HEAT
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HEAT / THERMAL CAPACITY
the amount of heat required to raise
temperature by 1 degree.
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FORMULA :
Where:Q = amount of heat
transferredm = mass C = specific heatT = change in temperature
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How much heat is needed to raise the temperature of 5kg of water 10 k?
Given:
m = 5kgC = 4180 J/kg.KT = 10 KQ = ?
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Solution:Q = mC T = (5kg)(4180J/kg.k)(10 K)
= 209 000 J
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• How much energy is lost by 10 kg of brass if it is cooled from 35 to 25 C?
38 500 J or about 9200 cal
• It takes 487.5 J to heat 25 grams of copper from 25 °C to 75 °C. What is the specific heat in Joules/g·°C?
c = 0.39 J/g·°C