One end of a string 3.3 m long is moved up and down with simple harmonic motion at a frequency of 48 Hz . The waves reach the other end of the string in 0.5 s. Find the wavelength of the waves on the string.

Abird flies directly overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. the bird has a mass of 2.0 kg. the radius vector to the bird makes an angle \thetaθ with respect to the ground. the radius vector to the bird and its momentum vector lie in the xyxy-plane. what is the bird’s angular momentum about the point where you are standing?