pendulum angle stuff

Question 1

a 4 kg mass on a spring undergoes this motion. the max energy stored in the spring is …. J
(on slides)

Answer 1

Ts = 2 * pi * sqrt(m/k)

(3/2pi)^2 = m/k

k = m/.2279

k = 17.55

1/2 * k * .25 = Us

Us = 2.19

Question 2

matter/medium does/does not travel with energy

Answer 2

does not (ocean waves!)

Question 3

velocity of a wave

Answer 3

velocity = wavelength (7 meters per car) * wave frequency (amount of cars per second)

Vwave = lambda * frequency

can be used to find the frequency and wavelength of given variables (speed of light = c)

Question 4

A harmonic wave I traveling along a rope. oscillator creating wave = 40.0 vibrations in 30 seconds, and a given maximum travels 425 cm along a rope in 10.0 seconds. find wavelength

Answer 4

f = 40 vibrations/30 seconds
f = 1.33 vibrations / second
4.25 m / 10 s
.425 m / s

0.425 = wavelength * 1.33
wavelength = 0.319 m

Question 5

given equal speeds, a shorter wavelength means the wave has a higher…

Answer 5

frequency
long wavelength = lower frequencY GIVEN SAME SPEED

Question 6

the one misconception about the wavespeed equation….

Answer 6

there are multiple speeds of waves given different mediums

SPEED IS DETERMINED BY MEDIUM

Question 7

speed of a wave is determined by…

Answer 7

medium

Question 8

frequency is determined by…
speed is determined by….
wavelength is determined by…

Answer 8

frequency - oscillations of the source
speed - medium
wavelength - the other two factors in the equation