Discussion-21

# Discussion-21 - Waves Waves Discussion#21 Ch.16.1&16.4...

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Waves Di i #21 Ch 16 1 & 16 4 Discussion #21 – Ch. 16.1 & 16.4 Physics 125 – Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] Office Hours: 2:00 4:00 / Mon & Tue in Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Test #1 Your cousin Tom is playing with the clothesline. He unties one end, holds it taut, and wiggles the end up and down, executing simple harmonic motion with a frequency of 2.00 Hz and amplitude 0.075 m. The wave speed is v = 12.0 m/s. At time t = 0 the of 2.00 Hz and amplitude 0.075 m. The wave speed is v 12.0 m/s. At time t 0 the end has maximum positive displacement and is instantaneously at rest. Write a function describing the traveling wave at position x and time t . Hint: figure out the amplitude (A), frequency (f) and wavelength ( λ ) first. ( ) A. ( , ) 0.2cos 12.6 1.05 y t x t x = ( ) B. ( , ) 0.075cos 12.6 1.05 y t x t x = ( ) C. ( , ) 0.075cos 12.6 3.3 y t x t x = ( ) D. ( , ) 0.075cos 8.4 1.05 y t x t x =
Test #2 – same problem Your cousin Tom is playing with the clothesline. He unties one end, holds it taut, and wiggles the end up and down, executing simple harmonic motion with a frequency

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