Explain all the steps to get from a nebula to a new star. What role does gravity play?

Determine the maximum r-value of the polar equation r =3+3 cos 0

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

What is similar between metals and suspensions