The suns intensity at the distance of the earth is 1370
Chapter 19, Problem 19.108(choose chapter or problem)
The suns intensity at the distance of the earth is 1370 W/m2 . 30% of this energy is reflected by water and clouds; 70% is absorbed. What would be the earths average temperature (in C) if the earth had no atmosphere? The emissivity of the surface is very close to 1. (The actual average temperature of the earth, about 15C, is higher than your calculation because of the greenhouse effect.)
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer