Kepler's discoveries regarding the motions of the planets were based on the observations of
copernicus
artistarchus
brahe
ptolemy

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.