Homework Help: Physics ~Thermodynamics~

Posted by Isis on Tuesday, March 5, 2013 at 6:15pm.

* Pressure *
1) what other ways can the pressure of a gas be changed?

* Internal Energy *
2) A cup of hot tea is poured from a teapot, and a swimming pool if filled with cold water.
a) Which one has a higher internal energy?
b) Which has a higher average of kinetic energy?

* Transfer of Heat *
- Conduction -
a) Why are the liquids and gases good insulators?
b) Why is the snow coverage the same on all roofs?
c)Does a 'warm' blanket provide you with heat?why?
d) Why can you stick your hand into a oven for several seconds without harm, whereas you would never touch the metal inside oven even for a second?

- Convection -
a) Why an you hold your fingers beside the candle flame without harm, but not above the flame?

* 1st Law of Thermodynamics *
a) if 10 J of energy is added to a system that does 4 J of external work, by how much will the internal energy of the system be raised?

>> please help me!!

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