# Homework Help: Transverse standing wave?

1. Feb 21, 2010

### physnoob

1. The problem statement, all variables and given/known data
When mass M is tied to the bottom of a long, thin wire suspended from the ceiling, the wire's second-harmonic frequency is 200 Hz. Adding an additional 1kg to the hanging mass increases the second-harmonic frequency to 245 Hz. What is M?
f$$_{2}$$ = 200hz, m = M
f$$_{2}$$ = 245hz, m = M+1
g = 9.8m/s

2. Relevant equations
f=v/L, v = $$\sqrt{T/u}$$

3. The attempt at a solution
not sure where to start the problem