SHM
If you double the frequency of a system, what happens to the period and and the angular frequency
The period is reduced to 1/2 the original and the angular frequency is also doubled.
Explain constructive interference and what happens to the amplitude of the waves
The are on the same side and they increase.
The speed of sound in steel is 5000 m/s, what is the wavelength of sound of a wave of frequency 660 Hz in steel
7.58 m
If 60 cm is the 3rd harmonic of a standing wave oscillating at 950 Hz, what is the wave speed?
380 m/s
Given a velocity vs time graph (looks like a transverse wave with 3rd harmonic) what does the acceleration vs time graph look like?
Should start at line and go 1 1/2 wavelengths
Explain destructive interference and what happens to the amplitude of the wave.
decrease the amplitude.
A guitar has a fundamental frequency of 500 Hz, what is a possible resonant vibration.
any multiple of 500
Draw a longitudinal wave and label the compressions and the rarefractions.
check graphs
In SHM when is the speed the greatest? (could be more than one answer)
When the magnitude of acceleration is a min, when the potential energy is 0 (so kinetic energy is max)
What is resonance?
When a wave vibrates at the natural frequency?
Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes. What is the frequency of Tarzan's swing?
0.21 Hz
Draw a transverse wave and label the wavelength and the amplitude.
check graphs
On a pendulum, where is the instantaneous acceleration the greatest?
At the top of the swing
What is diffraction?
When a wave goes through an opening?
Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes. How long is vine he is using?
5.7 M
On the moon,, the acceleration of gravity is g/6. If a pendulum has a period of T on Earth, what is the period on the moon
T * sqrt of 6
If the pendulum of length L is suspended from the ceiling of an elevator, when the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves downward with constant acceleration.
The period increases
What is the Doppler Effect
When you hear a change in the frequency of a moving object (coming towards you the frequency appears higher the wavelength smaller, going away the frequency appears lower and the wavelength is larger)
7 s after a brilliant flash lightning, thunder shakes the house. Approximately how far the lightning strike from the house?
about 2 km away
If a floating log is seen to bob up and down 15 times in 1 min as waves pass you by, what is the frequency and the period of the wave.
f = 0.25 Hz and T = 4s