I understand everything up until:
√MgL/m = L/t
Why is that equal to L/t?
I also don't understand this either:
This is the problem itself however I don't feel it's that important since I am trying to figure out how they are arriving at their conclusions.
An astronaut on a small planet wishes to measure the local value of the free-fall acceleration by timing pulses traveling down a wire that has an object of large mass suspended from it. Assume a wire has a mass of 4.10 g and a length of 1.60 m and that a 3.00 kg object is suspended from it. A pulse requires 43.6 ms to traverse the length of the wire. Calculate g of planet from these data. (You may ignore the mass of the wire when calculating the tension in it.)