Heat is defined to be

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# Heat is defined to be - PowerPoint PPT Presentation

Heat is defined to be. The amount of microscopic translational and rotational kinetic energy in an object Energy that is transferred to an object because of a temperature difference The temperature of an object in terms of degrees Kelvin. Energy transferred (Q).

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## PowerPoint Slideshow about 'Heat is defined to be' - lani

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Presentation Transcript
Heat is defined to be
• The amount of microscopic translational and rotational kinetic energy in an object
• Energy that is transferred to an object because of a temperature difference
• The temperature of an object in terms of degrees Kelvin.
200 g of water at 100o is poured into 200 g of water at 0o. The resulting temperature will settle down to be
• 0o
• 50o
• 100o
• Greater than 50o but less than 100o
• Less than 50o but more than 0o

cwater=4186 J/kg oCcgold=129 J/kg oCI use a heating element to put heat into a kg of water and a kg of gold at the same rate. Which changes temperature faster?

• 1 kg water
• 1 kg gold
• They both heat up at the same rate.

Q is energy transferred

Put 100g Al at 100o C into 500g water at 20o C. What is the final T?What will the final T be?
• 100o
• 97o
• 20o
• 23o
• 60o

cAl= 900 J/kg oC

cH2O = 4186 J/kg oC

You put 0.4 kg of lead into a bucket containing 1.2 kg of pure acetone. Why in the world did you do that?
Idolatry (Even non-believers find something to believe in)

"As I study ancient scripture, I am more and more convinced that there is significance in the fact that the commandment 'Thou shalt have no other gods before me' is the first of the Ten Commandments." - President Spencer W. Kimball (Aug 1977 Ensign)

Latent heat of fusion vs. vaporization

You place equal weights of ice (at 0o C) and boiling water (at 100o C) into a well-insulated container. What is the final temperature.
• 0o C
• Between 0oand 50o C
• 50o C
• Between 50o Cand 100o C

Lf 3.33x105 J/kg

Lv 2.26x106 J/kg

c ice 2090 J/kg·oC

water 4186 J/kg·oC

steam 2010 J/kg·oC

You place a mass mi at temperature Ti into a mass mw of water at temperature Tw. What will be the final temperature, and how much ice will there be?

You place equal weights of ice (at -20o C) and water (at 0o C) into a well-insulated container. How much boiling water must be added to produce only water at 0o C.

Lf 3.33x105 J/kg

Lv 2.26x106 J/kg

c ice 2090 J/kg·oC

water 4186 J/kg·oC

steam 2010 J/kg·oC