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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?
(b) How long (in years) does it take for the sun to make one revolution around the center?

  • Physics -

    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.

  • Physics -


  • Physics -

    a. 264000

  • Physics -

    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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