Acellist tunes the c string of her instrument to a fundamental frequency of 65.4 hz . the vibrating portion of the string is 0.600 m long and has a mass of 14.4 g .
what is μ, the mass per unit length of the string?
to determine the wave speed from purely kinematic quantities, you need to know the wavelength of the wave. what is the wavelength λ of the fundamental mode in the c string of the cello?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?