- #1

shanepitts

- 84

- 1

## Homework Statement

## Homework Equations

(mv

^{2})/r=(GMm)/r

^{2}--------(1)

r≈8kpc≈2.47×10

^{20}m

v≈220kms

^{-1}

## The Attempt at a Solution

Using equation (1) and solving for M I got

M=(v

^{2}r)/G=(4.84×10

^{10}2.47×10

^{20})/6.67×10

^{-11}

M=1.79×10

^{41}kg

does this answer seem correct?

P.S. This is not a homework assignment, it's an exercise from an introductory book I'm reading.