Our sun rotates in a circular orbit about the center of the Milky Way galaxy. The radius of the orbit is 2.2 1020 m, and the angular speed of the sun is 1.2 10-15 rad/s.

Question

(a) What is the tangential speed of the sun?
m/s
(b) How long (in years) does it take for the sun to make one revolution around the center?
y

Answer 1

a) V = (angular velocity) x (orbit radius)

b) Period = 2 pi/(angular velocity)
The answer will be in seconds, so you must convert that to years by dividing my the number of seconds in a year.

Answer 2

34.67

Answer 3

a. 264000

Answer 4

a. Vt= w*r
= (1.2*10^-15)*(2.2*10^20)
= 264000 m/s

b. w= period/time

1.2*10^-15= 2pi/t

t= 5.2*10^15 seconds

t= 1.7*10^8 yrs