Alithium atom has three protons, three neutrons, and three electrons. what is the overall charge on this atom?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

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?

Is the vertical component of velocity ever zero?