Recent content by anyaxo

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    Why do different formulae give me different answers for mass of galaxy?

    I am trying to calculate the mass of the galaxy within the orbit of the sun. M = Mass of the galaxy = ? r = ‘Distance of sun from galactic centre = 7.6 kpc’ = 2.3 x 1017 km = 2.3 x 1020 m (2 sf) G = Gravitational constant = 6.67 x 10-11 Nm2kg-2 v = ‘Radial velocity of the sun =...
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    What is the Mass of the Milky Way and How is it Calculated?

    M = Mass of the galaxy = ? r = Distance of sun from galactic centre = 10kpc= 3.09 x 1017 km (3 sf) G = Gravitational constant = 6.67 x 10-11 Nm2kg-2 v = Radial velocity of the sun = 220,000 ms-2 Since the Sun’s orbit around the galactic centre is nearly circular, it undergoes...
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    Radial Velocity of the Sun around Galactic Centre

    I need to calculate the radial velocity of the sun. Every time I try using Newton's Laws of Gravitation, I end up getting a value of 0.733 m/s. Apparently the actual value is 220000 m/s. Mass of Sun = 1.99 x 10^30 kg (3sf) G = 6.67 x 10^-11 Nm^2kg^-2 r = distance of Sun from galactic centre...