# Physics

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.
(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

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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.

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2. 34.67

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3. a. 264000

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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

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