Mechanical waves learning goal: to practice problem-solving strategy 15.1 mechanical waves waves on a string are described by the following general equation y(z, t) a cos(kz wt) a transverse wave on a string is traveling in the +ac direction with a wave speed of 7.50 m/s, an amplitude of 9.00x10 2 m and a wavelength of 0.550 m at time t 0, the z 0 end of the string has its maximum upward displacement. find the transverse displacement y of a particle at 2 1.40 m and t 0.150 s. part a classify each of these variables as known or unknown drag the appropriate variables to their respective bins. reset angular frequency wave speed wavelength frequency wave number amplitude known unknown submit my answers give up part b calculate the frequency fof the wave on the string. express your answer in hertz. hz