a. If you face a steep mountain 237 m away and yell, how many seconds will pass before you hear the echo? (Assume the speed of sound is 344 m/s.)

b. A guitar string has a linear mass density of 0.006 kg/m. If the string's tension force is 79 N, what is the speed of waves on the string (in m/s)?

c. A 60 m long, 120 kg steel cable is connected to two poles. The tension force in the cable is 1,505 N. The wind makes the cable vibrate with a frequency of 1.5 Hz. What is the wavelength of the vibrational wave?

d. An 31.1 m long string has a mass of 0.56 kg. Calculate its linear mass density (in kg/m).