Heat And Specific Heat. Heat Energy that is transferred from one body to another because of temperature Unit 1 calorie (cal) – heat needed to raise 1g.

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Presentation transcript:

Heat And Specific Heat

Heat Energy that is transferred from one body to another because of temperature Unit 1 calorie (cal) – heat needed to raise 1g water 1°C Mechanical Equivalent of Heat – amount of work done by 1 calorie 1 cal = J

Example A 60 kg person overeats by 500 Calories. How much work must he do to make up for this binge? How high of a flight of stairs would this be?

Example A 3.0g bullet traveling at 400m/s passes through a tree and slows to 200m/s. How much heat is produced?

Specific Heat Amount of heat (Q) required to change the temp of a material is proportional to the mass(m) and the temp change Q = cm  T c – specific heat higher specific heat, more heat it takes to change the substance’s temp

Example How much heat is required to raise the temp of an empty 20kg vat made of iron from 10°C to 90°C? What if the vat is filled with 20kg of water as well?

Calorimetry Process of determining heat Works off the idea that heat lost by one material must be gained by another

Example A 15.0 g sample of metal at 75 o C is added to 150.0g of water at 15 o C. The temperature of the water rises to 18.3 o C. Calculate the specific heat of the metal.

Example If 200ml of tea at 95°C is poured into a 150g glass cup at 25°C, what will be the final temp of the mixture?

Example A.150kg sample of metal is heated to 540°C and then placed in 400g of water at 10°C which is in a 200g aluminum calorimeter. The final temp of the mix is 30.5°C. What is the specific heat of the metal?