Wave Charateristic
What happens when two waves are in the same place?
Interference: The disturbances of the waves add
Two types of harmonic oscillators
Spring Force Equation
What does each variable mean?
F = kx
A pendulum swings 50 times in 30 seconds. Calculate it's frequency and period.
1.6 Hz T = 0.6s
The equation for gravity at the surface of a planet.
Fg = mg
The meaning of centripetal
Center Seeking
The frequency of a wave depends on
The source of the vibration.
On earth, the only way to change the period of a pendulum is to change its _______
Length
The graph of force vs stretching for a spring will have a shape that is
Linear
The force of gravity is ______proportional to the product of masses
directly
The direction of the velocity of an object in circular motion is described as ________
tangential
A stiff spring will oscillate with a ____________ frequency than a looser one.
higher
150N/m
4
What force acts on a car that drives in a circle?
Friction
(Centripetal Force just describes the net force on an object moving in a circle)
A wave in which the disturbance is parallel to the motion of the wave.
What is a longitudinal wave
For a harmonic oscillator, kinetic energy is maximized at this location
What is equilibrium position
Convert 134g to kg.
0.134kg
a point on a longitudinal wave that is bunched together
What is compression
In the equation for universal gravitation, the r stands for
distance between centers
For a satellite in orbit, the centripetal force is equal to ________
The force of gravity (universal)
When two crests overlap, the result is
Constructive interference: A bigger crest
A 2kg mass is placed on a spring and set into oscillation. If the amplitude of the oscillation is doubled, the resulting period will be ___________.
The same
Period of harmonic oscillators does not depend on amplitude.
Convert 21cm to m
0.21m
What is the difference between G and g
G is universal: works for any two masses
g : is useful for surface gravity. Each planet/moon has a different value of g
The vertical distance from the top of a wave to the bottom is 4m. The horizontal distance from peak to trough is 2m. The wave goes Up and down 3 times in 1 second. Find the amplitude, wavelength, period, and frequency of the wave
T = .33s
lambda = 4m
f = 3Hz
A = 2m
v = 12m/s
The speed of a wave depends on _______
The medium the wave travels through
The length of a pendulum with a period of 2s
About 1m
A spring stretches 30mm when a 500g mass is hung from it. Calculate the spring constant.
166N/m
A standing wave with 3 antinodes forms on a 5m long string when the frequency is 9Hz.
What is the wave speed
3v/2L = f3
v = 30m/s
If the earth had twice the mass, but half the radius, how would the gravity at the surface be affected?
The surface gravity would be 8 times as much.
2x (from double mass)
4x (from half radius)