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AP2 Ch14 Heat & Heat Transfer

AP2 Ch14 Heat & Heat Transfer. 14.2 Temperature Change and Heat Capacity. Heat transfer : Fig 14-4. Calorimetry. Since heat, Q, is a form of E… Q L = Q G Q = 0 = mcT So,. Prob #1. How much heat energy, in joules, must be supplied to change 100g of ice at –20 o to steam at 120 o ?.

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AP2 Ch14 Heat & Heat Transfer

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  1. AP2 Ch14Heat & Heat Transfer

  2. 14.2 Temperature Change and Heat Capacity Heat transfer : Fig 14-4

  3. Calorimetry • Since heat, Q, is a form of E… • QL = QG • Q = 0 = mcT • So,

  4. Prob #1 How much heat energy, in joules, must be supplied to change 100g of ice at –20o to steam at 120o?

  5. Ask yourself, “Self…?” • What exactly has to happen? • Ice must heat up to 0o in order to melt. • Ice must then melt to water at 0o. • Water must heat up to 100o to turn to steam. • Water has to turn to steam. • Steam has to heat up to 120o. • Note: 5 STEPS!

  6. Step 1

  7. Step 2

  8. Step 3

  9. Step 4

  10. Step 5

  11. Step 6 - Solution

  12. Calorimetry • QL = QG • Phase Change • So,

  13. EXAMPLE 14-2, p477 Step 1. Calculate the change in gravitational potential energy as the truck goes downhill. Calculate the temperature increase of 100 kg of brake material with an average specific heat of 800 J/kg ⋅ ºC if the material retains the energy from a 10,000-kg truck descending 75.0 m (in vertical displacement) at a constant speed.

  14. EXAMPLE 14-2, p477 Step 2. Calculate the temperature from the heat transferred using Q=Mgh. Calculate the temperature increase of 100 kg of brake material with an average specific heat of 800 J/kg ⋅ ºC if the material retains the energy from a 10,000-kg truck descending 75.0 m (in vertical displacement) at a constant speed.

  15. 14.4: Heat Transfer Methods

  16. 14.4: Heat Transfer Methods

  17. 14.4: Heat Transfer Methods

  18. 14.4: Heat Transfer Methods kstyro=0.01 J/s

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