Answered

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Suppose you observe a star orbiting the galactic center at a speed of 1400 km/s in a circular orbit with a radius of 26 light-days. Calculate the mass of the object that the star is orbiting. Express your answer in solar masses to two significant figures.

Sagot :

hamzaahmeds

Answer:

M = 9.9 x 10ā¶ Solar masses

Explanation:

Here the centripetal force is given by the gravitational force between star and the object:

[tex]Gravitational\ Force = Centripetal\ Force \\\frac{mv^2}{r} = \frac{GmM}{r^2}\\\\M = \frac{v^2r}{G}[/tex]

where,

M = Mass of Object = ?

v = orbital speed of star = 1400 km/s = 1400000 m/s

G = Universal Gravittaional Constant = 6.67 x 10ā»Ā¹Ā¹ N.mĀ²/kgĀ²

r = distance between star and object = (26 light-days)(2.59 x 10Ā¹Ā³ m/1 light-day) = 6.735 x 10Ā¹ā“ m

Therefore,

[tex]M = \frac{(1400000\ m/s)^2(6.735\ x\ 10^{14}\ m)}{6.67\ x \ 10^{-11}\ N.m^2/kg^2}[/tex]

M = (1.97 x 10Ā³ā· Ā kg)(1 solar mass/ 1.989 x 10Ā³ā° kg)

M = 9.9 x 10ā¶ Solar masses

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