1)A tightly sealed house has a large ceiling fan that blows air out of the house and into the attic. This fan is turned on, and the owners forget to open any window or doors. Wht happen to the air pressure in the house after the fan has been on for a while, and does it become easier or harder for the fan do its job? Explain.
2)Above the liquid in a can of hair spray is a gas relatively high pressure. The label on the can including the warnings “Do not store at high temperature”. Use the ideal gas law and explain why the warning is given.
3)Atmospheric pressure decreases with increasing altitude. With this fact in mind, explain why helium filled weather balloons are underinflated when they are launch from earth.
4)If the temperature of an ideal gas is doubled from 50to 100 degree C. does the average translational kinetic energy of each particularly double?
2007-01-02 10:49:34 · 1 answers · asked by krish s 1 in Science & Mathematics ➔ Physics
1. Oversimplified, but if the seals are good and the fan reasonably powerful the pressure will increase in the attic and decrease in the rest of the house. Since PV is proportional to T, and the volume remains the same, if the pressure goes up so must the Temperature, and in the rest of the house, the pressure goes down, and so does the temperature. Eventually, this will put a larger load on the fans motor.
2. Increase the tempreature in a container of fixed volume and the already high Pressure will have to go up. Eventually the can will explode.
3 Because the helium at lower pressure but near equal temperature has to expand in volume
4, Don't forget the temperature for the ideal gas laws must be in Kelvin, not Celsius, so a change from 323 degrees to 373 degree won't double the Kinetic energy.
2007-01-02 11:07:30 · answer #1 · answered by SteveA8 6 · 0⤊ 0⤋