1. The problem statement, all variables and given/known data The velocity of a traverse wave traveling along a string depends on the tension of the string, F, which has units of force, and its mass per length unit u. Assume v = F^x * u^y. The values may be found using dimensional analysis. 2. Relevant equations I am pretty sure I understand dimensional analysis. I just don't know what the units are for "mass per length" . I am assuming that the Force is in newtons (kg * m /s^2) and I know velocity is (m/s). Sorry for the goofy question but I'm still waiting on my book to come in from Amazon and I can't to find an answer on Google for mass per length. Thanks 3. The attempt at a solution I don't want help with solving the problem itself. I am just wondering what mass per unit length means so I can solve the question.