Sun orbits at roughly 26,000 ly from the center of the galaxy and takes 225 million years to make one orbit. i: at what speed does sun revolve around the center of the galaxy? (give your answer in km/s; show all work.) ii: what is the circumference of sun's orbit if we consider its orbit to be circular? iii: what is the mass of the galaxy within sun's orbit?

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.