The intensity of sunlight near the Earth is approximately 1000 W/m².
(a) If a spacecraft near the Earth uses a square solar sail 200 m on a side and absorbs all light that strikes it, what is the force on the spacecraft?
(b) This spacecraft eventually reaches Jupiter, where its distance from the Sun is 5.2 times larger than the distance from the Sun to the Earth. What is the force on the sail now?