Free body diagram Definition and 254 Threads

I have a question in my textbook that I can't answer for the life of me. "A 6500-kg helicopter accelerates upward at .6 m/s^2 while lifting a 1200-kg car. (a) what is the lift force exerted by the air on the rotors?" Now, my diagram has a vector pointing up with a force of (6500*9.8)N...

A block is held in place on a frictionless incline by a massless string. The string is horizontal. I have to sketch a free body diagram for the block showing all the forces exerted on the block.

IM in Phys.20 Got this question for an assignment. Tried it and got stuck. I really need help -------- When golfing, uphill and downhill putts present different levels of difficulty. Suppose a green has a 5.0 degree slope and the force of friction will be 0.10N...

Howdy, I had Physics two years ago in High School and am now in Engineering Physics. I am trying to have a head start on everything and it is also a project, can anyone check my FDB for correctness? Thanks, Matt http://homepage.mac.com/jjacques2/fbd.gif