Approximately how many years will the sun remain on the main sequence

Could someone . i have tried to solve myself but my calculation is off

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?

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation