1. The problem statement, all variables and given/known data Dimensional Analysis: A displacement is related to time as: x = A sin (2∏ft), where A and f are constants. Find the dimensions of A. (Hint: a trigonometric function appearing in an equation must be dimensionless.) 2. Relevant equations t = seconds The domain of a sine must be an angle. 3. The attempt at a solution x = A sin (2∏ft), where A and f are constants. m = A sin (2∏fs) A = m/[sin (2∏fs)] Therefore, f, a constant, must be in terms of s-1, in order to cancel out the s next to it, as the input of sine in an equation must be dimensionless. Therefore, A = m Thanks for any help!