Heat and Nuclear
Two different materials are at thermal equilibrium with each other. This means they have the same _______.
Temperature
How do the charge on an electron and proton compare to each other?
equal in magnitude and opposite in sign (electron is negative and proton is positive)
What happens to the current in a wire if the thickness of the wire is increased?
It increases
Magnetic field lines always point towards the _______ pole and away from the ______ pole.
south; north
What is the speed of sound in a vacuum?
0 or it doesn't move through a vacuum
Nuclear power plants use this process to generate heat.
Nuclear fission
A positively charged object is 1 meter away from a negatively charged object. How does the force of attraction change if the distance between them is doubled?
The force becomes 1/4 as much.
2 resistors are connected in series to a battery. If you remove one of the resistors from the circuit, what will happen to the voltage drop across the other resistor?
increase
If you break a magnet in half, each half...
becomes a smaller magnet
has north and south poles
has a magnetic field
When light bounces off a mirror, the angle of incidence equals the angle of ____ ?
Reflection
An atom undergoes radioactive decay and emits an electron. What type of radioactive decay occurs?
Beta Decay
You have a piece of wool, a piece of Styrofoam, and an aluminum pie pan. How do you give the pan a positive charge?
charge styrofoam with the wool by friction and use it to charge the pan by induction. (grounding the pan when it is near the styrofoam)
A 4 ohm and 6 ohm resistor are connected in series to a battery. Which resistor has a greater voltage drop?
6 ohm
Describe 3 ways to make an electric motor spin faster.
increase the number of coils (more wire)
increase the strength of the magnetic field
increase the current within the wire
If a car coming towards you honks the horn, the Doppler Effect will cause the horn's frequency to sound _______ than the actual sound of the horn.
higher
If you drop a 20 g aluminum mass into an insulated cup of 15 g of water at 25˚C, and the aluminum loses 1000 J of energy, what is the final temperature of the water? (cwater= 4.18 J/g ˚C)
~41˚C
Two conductors have a charge of +15 and -3 respectively.
If they come in contact with each other, what will their final charges be?
+6 and +6
Two lightbulbs are wired in parallel. Will they be brighter if their resistance is high or low?
Low
What device uses mechanical energy to create electrical energy.
a generator
Name two things that must happen for total internal reflection to occur.
angle of incidence is greater than the critical angle
index of refraction for the material where the light starts is greater than the index of refraction of the second material
DAILY DOUBLE: How much heat needs to be added to bring 100 grams of solid ice at -70 oC to -20 oC?
(cice = 2.10 J/goC)
10,500 J
What is the force of repulsion between a 0.04 C charge located 200 m away from a 0.08 C charge?
720 N
A circuit has five 10 Ohm resistors in parallel. If they are all connected to a 30 V voltage source, what is the total current?
15 A
If a wire is held up vertically and has conventional current flowing downwards, which way would a compass point that is placed behind the wire?
to the right
A guitar string is vibrating at a frequency of 440 Hz and has a wavelength of 1.2 m. What is the speed of the wave along the string?
528 m/s