# Calculate the velocity of the transverse wave at any position

1. Sep 17, 2009

### harini_5

a string of length l and mass m hangs freely from a fixed point
calculate the velocity of the transverse wave at any position
sol:
mass per unit length is m/l
let there be a point on the string at a distance x from free end
tension at the point=wt of the string per unit length*part of the string
=(m/l)*x*g
and sol continues.

my doubt is why isnt the upper part contributing to the tension?
weight due to upper part must be pushing down the lower part.

2. Sep 17, 2009

### kuruman

Re: waves

If I understand your question correctly, the answer is "You can't push with a string."

3. Sep 18, 2009

### harini_5

Re: waves

sir,
the string here has considerable mass.let us consider the part x(as i have mentionedin prob) and l-x seperately.why isnt the weight due to upper part pushing down the lower part and contributing to tension?
isnt it just like a block placed over another as in this case it is clear that the upper block exerts some force over the lower?