Consider a solid, rigid spherical shell with a thickness of 100 m and a density of 3900 kg/m3. The sphere is centered around the sun so that its inner surface is at a distance of 1. 50×1011 m from the center of the sun. What is the net force that the sun would exert on such a dyson sphere were it to get displaced off-center by some small amount?.

Bbecause i need points 

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.