The person above is wrong. The first question asks for the amount of solar energy received, not the amount of mechanical energy converted to power. You simply need to remove *12% from your answer.
2 questions answered P (power) = (result of question 1)*12%/1000
Question 3: P= F*V F=mg*1/10 P is the result of question 2, V is what you want. Count yourself Forget it~~~I have something to do.