Energy
What is the standard unit for energy?
joules (J)
THIS is the variable symbol for pressure
P
Do gases have weight on the Earth?
Yes; gases are matter and therefore they have mass
What is the name of the collision where the particles stick together?
inelastic collision
g
10 m/s2 or 9.8 m/s2
1/2 mv2 is the formula for this type of energy
THIS is the standard unit of pressure
Pa
compare the densities of liquids and solids
about the same
Two objects are rotating. They collide and stick together. What, if anything, must be conserved?
Rotational momentum
Rotational energy is NOT conserved
In Maxwell distribution diagrams, what must be true about the area for plots at different temperatures for the same system?
Area under the curve must be the same--only changing the temperature, NOT the total number of particles
What is the formula for gravitational potential energy?
mgh or something similar
This is the standard unit for weight
newtons (N)
Two primary differences between the liquid and gas states
liquids are dense and non-compressible
gases have high translational motion
gases have more energy
liquids conform to their container; gases fill their container
You are talking to a 9th grader: Distinguish between mass and weight
mass is the amount of stuff--constant anywhere in the universe
weight is the force of gravity on an object--only have weight near very large objects (planets, moons, stars)
Three types of energy from a thermodynamics standpoint (looking at the energy of particles in a system)
translational, rotational, vibrational
What is the name of the concept when the initial energy of a system is equal to the final energy of a system?
conservation of energy
This is the standard unit of volume
m3
Two primary differences between liquids and solids
liquids conform to the shape of the container (bottom up)
the relative positions between particles is constant for a solid (rigid); liquid molecules can slide past each other; liquids have translational motion, solids do not
liquids have more energy than solids
1.5 m/s2
Dark Side of the Moon by Pink Floyd
What is the generic variable symbol for the energy of position?
U
variable and unit symbol for force
F, N
The most common state of matter in the universe
plasma--it is the state of matter of stars
A 400 kg jet-fueled dragster produces 5500 N of thrust. How fast is the car traveling after 3 s?
41.25 m/s
Atmospheric pressure in standard units
100,000 or 1x105 Pa