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Question:

A solar sail is made of completely reflective material in a circle 10 km in radius.?

What is the force (in N) on this sail at the orbit of Mars which is 1.5 times farther from the Sun than the Earth (assume Sun gives 1000 W/m^2 at Earth's orbit around the Sun.)I know that I need to somehow use the intensity for a spherical wave formula, S P/(4*pi*r^2) and F PA where P is power. But other than that, I have no idea how to solve this problem. So, help would be greatly appreciated!

Answer:

some extra ratty clothes to put under the ratty clothes he is wearing when playing. I mean those things shoot out hard and leave a big bruise if theres not enough padding between the skin and the ball. Yeah, the face shield comes with it, I mean you would go blind if you cought one in the eye and I'm sure they sell padding too.. Might not look the coolest but after he gets hit once or twice I'm sure he'll appreciate the pads

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