Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 2.1 m long, its mass is 0.42 kg, and the force exerted on it by the children is 69 N.   What is the linear mass density of the rope (in kg/m)?     What is the speed of the waves on the rope (in m/s)?

The wavelength of an ocean wave is 4.1 m. It is measured to be traveling at 4.5 m/s. What is the period of the ocean wave? Calculate the frequency of the 3rd overtone of a closed of a closed pipe which is 25.1 cm long.

Which of the following four options is the correct one Which one or more? a. A spectrogram is a graph of frequency against amplitude and time with time on the x-axis, frequency on the y-axis and amplitude indicated by brightness or colour. b. A spectrogram is a graph of amplitude on the y axis against time on the x-axis. c.   A spectrogram is a graph of frequency against amplitude and time with time on the x-axis, frequency on the y-axis and amplitude indicated by crosses. d.   A spectrogram is a graph of amplitude against frequency and time with frequency on the x-axis, time on the y-axis and amplitude indicated by brightness or colour.

A musician strikes the strings of a guitar such that they vibrate with twice the amplitude. a. Explain why this requires an energy input greater than twice the original value.  b. Explain why the sound leaving the string will not result in a decibel level that is twice as great.