The sun revolves around the galaxy with a speed of 250 km/s…

Physics Inequations & Inequalities General MCQ (Single Correct)

The sun revolves around the galaxy with a speed of 250 km/sec and it's radius is 3 × × 10 4 light year. The mass of the milky way is

3 × × 10 40 kg

3 × × 10 41 kg

5 × × 10 40 kg

6 × × 10 41 kg

Text Solution

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The correct answer is:

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The mass of galaxy is given by

where v = 250 km/sec = 250 × × 10 3

r = 3 × × 10 4 ly = 3 × × 10 4 × × 9.46 × × 10 12 km ≈ ≈ 3 × × 10 20 m

∴ ∴ ≈ ≈ 3 × × 10 41 kg .

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