What is Energy
You are Lucas Jones. Your mullet has gotten so long that now you put it up in an 80s style tower, similar to Marge Simpson. The mass of the hairstyle is 50kg, the gravity is the standard earth's gravity, and the height is 0.75 meters. What is the Potential Energy of it?
367.5 J
Between what points on the roller coaster would the total kinetic energy pass the total potential energy first?
A to B
Light waves are an example of a:
Transverse Wave
What do we call the part of the Electromagnetic Spectrum that we can see?
The Visible Spectrum
How does SONAR work?
A signal wave is sent out and when it hits something it bounces back to the source, which is then calculated using speed, distance and time
When bonds at the atomic level break or form, what form of energy is being released?
Chemical Energy
Lets say we raise point B to 150 m tall. What would happen to a cart as it goes along the track?
It would not even crest hill B
The matter in which a wave propagates or travels through is called a:
Medium
When you hear a car past the sound tends to change, which is an observable change in frequency due to movement of the source. What is this called?
Doppler Effect
David is the captain of the USS Talks a Lot. They send out SONAR signals underwater, attempting to locate the nefarious pirate One-eyed Hutton. They get a signal 7000 meters away. Assume the speed of water is 1500 m/s. How long until they reach One-eyed Pinkerton? Speed = distance/time
4.67 seconds
What is energy, as per our slides?
The ability to do work
At what point on the coaster would the potential energy be the highest?
Crest
How do your vocal cords produce sound?
Vibrations
The distance a particle is displaced from its resting place, otherwise known as how tall the wave is:
Amplitude
What is the threshold of hearing?
The lowest (quietest) point at which a person can hear
What are the two main forms of potential energy we talked about in class?
Elastic and Gravitational
Kyra Francis is the head worker in the county morgue. She is tasked with moving a new customer from the entrance of the morgue to the processing point. The cart is pushed forth at an efficiency of 73% and utilized 675 joules of energy. What is the input?
924.66
What is an example of an electromagnetic wave?
Light wave
What is the difference between compressions and rarefactions:
Compressions are packed closely together, where as rarefactions are areas of waves stretched apart
True or False: The Speed of sound waves does not vary based on the medium
False
You are J'Lynn Sarlo. You are relatively short, so Mr. Grim has a hard time seeing you when he is standing up. Therefor you have to jump. At the height of your 0.5 meter vertical jump you have 1000 J of Potential Energy. What is your mass?
204.08 kg
Throw everything you know of efficiency out the window. Suddenly machines can have efficiencies of over 1. You are utilizing this new miracle machine. You put in 1500 joules of effort and it produces an out of 3000 joules. What is the efficiency?
200%
What is the difference between a mechanical wave and an electromagnetic wave?
A mechanical wave requires a medium to travel through, while an electromagnetic wave does not
Speed = ?Frequency = 15 hzWavelength = 100 m/s*
1500 m/s
What do sound waves need that light waves do not?
A medium