If the wind applies a force of 13.2 lb to the sign at the geometric center of the sign surface, will the sign tip over? if so, how much evenly distributed weight (sand bags) should be added to the base of the sign to keep it from tipping when the wind blows?

this is poiselle's equation from fluid mechanic in physics. mech eng

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.