Hi, i am kind of at a loss here. I cant seem to figure out this problem, not sure if i am doing it right or not. All help is greatly appreciated. A ball of mass 4kg is suspended on a light spring with a constant of 850n/m. the ball is spun in a circular orbit at a constant speed so the string makes an angle of 22 degrees from the vertical. find the length of the spring and the speed of the ball. Here is what i believe the diagram would look like. http://img212.imageshack.us/my.php?image=22me2.png alright so here is what i did right/wrong. fg=mg = 4(9.8) fg =39.2N fg=fspring mg=kxcos22 39.2=850xcos22 x=aprox 5cm the length of the spring is 5cm . That sounds pretty wrong...hope in right :D ok onto the speed. fc=(mv^2)/r T=39.2/cos22=42.3 tsin22=fc 42.3sin22=(m(v^2))/r 42.3sin22=(4(v^2))/5sin22 v=2.7m/s speed = 2.7m/s so did i do anything wrong..?