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A diffraction grating is basically a series of very small, point-like light sources, where the adjacent ones are always a given distance away. To have a bright line, the light waves from all of the point-...

For the riders to not fall out two forces acting on them must be equal, those forces being the gravity pulling them down towards Earth's surface and the centripetal force acting away from the centre of ro...

d=ut+0.5at²

so d=200m

The Moon

Fuel rods provide fissionable elements such as uranium - 235 , The uranium abosrbs a neutron at thermal speeds (  energy transefered to the moderator) from previous reactions. This then enables the Uraniu...