There is a special point that all object rotate around freely when tossed into the air. This point always travels the smoothest path, what is this point called?

Which is not true about oxygen-17 and oxygen-18?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Observations show that interstellar clouds can have almost any shape and