PLZZZ HELP ME :'(

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

Gunpowder residue is most likely to show up where on a shooters hands

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects