Please help me with this, it's one of the 'basic' problems and I can't do it at all. "The chains suspending a child's swing are 2.00 m long. At what frequency should a big brother push to make the child swing with largest amplitude?" Okay, so... the largest amplitude comes with a natural frequency... f1 = (1/2L)*(T/mu)^(1/2) I'm trying to figgure out why the rooted part gets to (g/L)^1/2... if T is mg and mu is m/L, wouldn't it be (gL)^1/2? And how does 1/2L turn into 1/2pi? Thanks for any help you can offer.