Identity the arrows that indicate heat being trapped by greenhouse gases

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

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?

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m