posted by Isis on .
* 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!!