Gina designed a model to show the steps in the Nebular theory of formation of
planetary systems. Which of these diagrams best represents the third step of Ginas model? 1) condensation and contraction of cloud due to gravity 2) rotation of cloud and dust 3) formation of planet 4) fusion of gas and dust at the center to form the sun

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

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?

Every winter i fly home to chicago. it takes 3 hours. what is my average speed?