Which part of an investigation is only found in an experimental investigation?Which components are part of all scientific investigations? Check all that apply.

What is the measure of a change in an objects velocity?

What is the role of lenses in microscopy?

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?