Arailroad tie weights 920 n and is 2.6 m long. how much force is required to: pick it up off the ground? lift one end and rotate it uniformly? lift it 0.6 m from one end, pivoting around the opposite end

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

so easy. just google the electromagnetic waves and it’ll pop up.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force