Part A: The sun produces 3.9 ⋅ 10^33 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 3.25 ⋅ 10^3 seconds?

Part B: Which is the more reasonable measurement of the distance between the tracks on a railroad:

1.435 ⋅ 10^−3 mm or 1.435 ⋅ 10^3 mm? Justify your answer.