What is the relief in an area were the highest point is 1,200 m above sea level and the lowest point is 200 m above sea level?

What happens to light waves from a star as the star moves away from earth?

The two required components for a generator

Asatellite component is in the shape of a cube with 10cm edges, has an evenly distributed mass of 2 kg and one bolt hole at each of four corners. if the maximum predicted random vibration environment is 10 grms, what bolt size would be a good choice for restraint? what other factors might drive bolt size besides force/stress?