Is most of the mass of an atom located in the nucleus or outside the nucleus how do you know?

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively

Drag each tile to the correct box. tiles bra i sequence