(a) Write an equation for a surface seismic wave moving in the x direction with amplitude 2.0...

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(a) Write an equation for a surface seismic wave moving in the −x direction with amplitude 2.0 cm, period 4.0 s, and wavelength 4.0 km. Assume the wave is harmonic, x is measured in meters, and t is measured in seconds. 

(b) What is the maximum speed of the ground as the wave moves by? 

(c) What is the wave speed?

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