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Question
(a) The Sun orbits the Milky Way galaxy once each $2.60 \times 10^8 \textrm{ y}$, with a roughly circular orbit averaging $3.00 \times 10^4$ light years in radius. (A light year is the distance traveled by light in 1 y.) Calculate the centripetal acceleration of the Sun in its galactic orbit. Does your result support the contention that a nearly inertial frame of reference can be located at the Sun? (b) Calculate the average speed of the Sun in its galactic orbit. Does the answer surprise you?

a) $.67 \times 10^{-10} \textrm{ m/s}^2$

b) $2.18 \times 10^5 \textrm{ m/s}$

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