Pressure Volume Ideal Gas Pags Flashcards
For heating up a flask of air using water bath , measuring pressure using tubing and pressure gauge , how to ensure this accurate
- ensure most of the flask under water
- ensure rubber tubing volume is small compared to the flask (so minimal volume lost)
How to ensure heating is uniform , so you are at CONSTSNT temo
MUST remove heat source and then STIR the
Water to ensure CONSTSNT temperature of water: ALWAYS STIR
Why when heating and changing temp quick is not good idea, what do we need to do
What should we do with thermometer
It is unlikely the heat would go to the thing wanting to heat, likely to lag. So allow time for heat energy to actually conduct before reading temperature
1) leave thermometer in for long to allow it to reach thermal equilibrium with the water, give time
Why is the pv against t graph in degrees not go through origin?
To go through origin at 0° either pressure or velocity or both must be 0
At 0° there is both pressure and velocity, but at 0K the pressure and velocity is 0
Remember internal energy of gas , the whole gas would be?
Energy if one gas atom Multiplied by all gas atoms = moles x avagadro
Rememebr internal energy of a gas = kinetic, it has no potential
Stupid, geostationary orbit Ofer another planet can have it down time period, just remember 3 conditond
Same orbit as planet
- equatorial
- same direction as spin
Grav potential is negative x on surface of earth what does this mean
With unite j per kg
It means the work done per KG in bringing test form infinity to that point = this, as it’s negative it means energy is needed to separate
.
Remember when a rocket in orbitnslows down to move lower in orbit and then increase speed to catch up and then speeds up to move higher, how can we explain using energy
Easy, just say when goes down change in potential is negative so enegry cinverted to ke and speeds up, vice cee a
Use kinetic theory to explain why some helium particles have more than the rewuired escape velocoyt
Random motion and elastic Collisons of partviled
Lead to distribution of kinetic energies among particles shown by Boltzmann
Although have an average
Some will have enough and escape
Why is there still a small amount of helium None the less in the atmosphere
Bevause itsproduced in radisioatcit decay as a helium nuckeusid an alpha particle
Why does mercury begin closer to the sun despite (what) still have no atmosphere compared to Pluto
Closer to sin means higher temp, despite having higher escpse velocity will still likely to have required to escape
Why must stars that are same mass ( binary star system) diametrically oppsite when orbit ?
- for them to orbit corcuale motion the centripetal force is provided by grav force
- the centripetal force must act towards centre of rotation which is along the diameter, equidistant
- the grvatianl atrrstcion force will also act through this line
Therefore the line connecting the stars must be diameter of a circle
