1. The problem statement, all variables and given/known data At Earth’s location, the intensity of sunlight is 1.5 kW/m^2. If no energy escapes Earth, by how much would Earth’s mass increase in a day? (Radius of Earth is 6.37 × 10^6 m.) 3. The attempt at a solution ok so, at any one time, half of the earth is lit. so surface area lit = 1/2 x 4[tex]\Pi[/tex]r2 = 2.55x1014m2 intensity = 1500 W/m2 so energy per second on earth = 1500 x 2.55x1014 = 3.82 x 1017 J energy per day = 3.82 x 1017 x 60 x 60 x 24 = 3.3 x 1022 so E = mc2 so m = E / c2 = 3.67 x 105 kg but the correct answer is half of this. so where did i go wrong? thanks for help!