Which image best illustrates diffraction?

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

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?