An engineer draws a diagram of the track for a rollercoaster. The first hill is labeled at position A, and the track ends at position F. How does the gravitational potential energy of the rollercoaster change as it travels between the following points? Select the correct answer for each description. *

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?