What is energy
When a sling is pulled back to maximum capacity and then released, what energy transfer is happening?
The elastic potential energy of the band is transferring to the projectile and is converting to kinetic energy
You get 7,000J of output from 13,000J of input. What is your waste?
6,000J
The distance a particle is displaced from its resting place, otherwise known as how tall the wave is:
Amplitude
The bouncing back of a wave when it meets a surface or boundary is:
Reflection
What do sound waves need that light waves do not?
Medium
When bonds at the atomic level break or form, what form of energy is being released?
Chemical Energy
What is the difference between an open and closed system
An open system allows the exchange of materials back and forth freely, while a closed system does not
A wave has a wavelength of 100 meters and a period of 20 seconds. What is the speed of the wave?
5 m/s
When a wave loses energy as it transmits into a material it is called:
Αbsorption
What are the relative units we use to measure sound?
Decibels
What happens to the kinetic energy of particles as they increase in temperature (Hint: They heat up)?
Kinetic energy increases
True/False Perpetual Motion Machines currently exist
False
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
A pattern of vibration that simulates a wave standing still is:
Standing Wave
What is the threshold of hearing?
The lowest (quietest) point at which a person can hear
You are Trey Marshall. In order to get a proper pump in, you need to move 240kg of weights at a velocity of 10 m/s. What is the kinetic energy expelled?
12,000 J
Brayden White shoots a basketball while using 1050 joules of energy. The output of the shot, after air resistance and gravity pushback, was 550 joules. What was the efficiency?
52.4%
The highest point of a wave is:
Crest
What is the difference between the nodes and antinodes in a standing wave?
The nodes are points of non-movement, where anti-nodes are points of maximum movement
What is the point at which two objects naturally vibrate at the same frequency?
Resonance
You are on earth, and you have just been assigned a 500-word essay. Your name is Brayden Durham. There is a basketball game later tonight. You realize that in order to make a rebound tonight, you will have to expel a lot more kinetic energy jumping than usual. For a typical jump, you need 1000 J of KE. You have a velocity of 10 m/s. What mass would you need in order to reach the proper KE?
20 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%
Cole frequently likes to open his mouth in an attempt to argue with other members of the class. Mr. Grim pulls out a special instrument that can measure his sound waves. Mr. Grim measures an astounding 1,315 sound waves leave Cole's mouth over a timeframe of 30 seconds. What is the frequency?
43.8 Hertz
True or False: The only difference between a reflection at a fixed boundary and reflection at a free boundary is that a reflection at a free boundary flips upside down, instead of just opposite.
True
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