Homework Help: Question :S

1. The problem statement, all variables and given/known data

By how much does the mass of the earth increase each year as a result of sunlight reaching it? Radiation from the sun reaches the EArth at a rate of 1400W/m^2 of area perpendicular to the energy flow. Assume 100% absorption.

2. Relevant equations
I'm sorry but I havent the slightest clue as to how to approach this question.
But we are given the Radius of the Earth as 6.36 * 10 ^6 m


3. The attempt at a solution

The answer is sopposed to be 1.23 * 10^8

 

First to answer your question: only half the surface area? Which would be 2pi r^2

So we have to solve for power useing power = rate * surface area

then solve for energy useing energy = power * time

then E = mc^2 to solve for mass..

Would this mass be the increase or the mass after one year?