Suppose you look at a spectrum of visible light by looking through a prism or diffraction grating. how can you decide whether it is an emission line spectrum or an absorption line spectrum?

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

J. j. thomson’s experiment disproved the theory that an atom

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.