Waves
If their is a high frequency in a wave, is the wavelength long or short?
The wave would have a short wavelength.
What is the difference between kinetic and potential energy?
Kinetic energy is energy of motion and potential energy is stored energy.
What is voltage?
The force that pushes the flow of electrons.
What is the formula for kinetic energy?
1/2 mass times velocity squared
How much current is in a circuit that includes a 9 volt battery with a resistance of 3 ohms?
3 amps
If the air temperature decreases, what happens to the speed of the sound wave?
The sound waves speed decreases.
What is the Law of Conservation of Energy?
Energy can't be created nor destroyed.
When resistance increases, what happens to the current?
The current begins to decrease.
What are the formulas for potential energy?
PE=mgh
PE=wh
How much current is in a circuit that includes a 9 volt battery and a bulb with a resistance of 12 ohms.
0.75 amps
In the doppler effect, how high is the pitch when the object is moving away from you?
The pitch gets lower
What happens in a closed system?
Energy is being isolated or going away.
In a series circuit, what happens when their is a break in the circuit?
The light bulb(s) will go out.
What are kinetic and potential energy measured in?
joules
A light bulb has a resistance of 4 ohms and a current of 2 amps. What is the voltage?
8 volts
Why do electromagnetic waves slow down as it passes through a different media?
The energy is being absorbed, reflected, refracted, and interfered.
What is conduction?
When heat is being directly transferred to another substance.
A lamp and a refrigerator are both examples of what?
They both are series circuits.
A 70-kg man is walking at a speed of 2.0m/s. What is the kinetic energy.
140j
An alarm clock draws 0.5 amps when connected to a 120 volt circuit. Calculate the resistance.
240 ohms
Where does light travel fastest through?
A vaccum
Describe the molecules when there is a high temperature.
The molecules are moving very fast and are hitting each other.
What is an electromagnet?
A device that is made magnetic by an electric current.
A 1400-kg car is moving at a speed of 25m/s. What is the kinetic energy?
437,500j
A portable CD player uses two 1.5 v batteries. If the current in the CD player is 2 A, what is the resistance?
1.5 ohms