Setting up integrals- the hardest challenge for most people in this course! ) a wire has a uniform (constant)linear mas density λ (in units of kg/m). find its total mass if: (a) the rod is straight and extends along the x-axis rom x-0 to x-l, (b) the rod is bent into a circular arc of radius r, extending from 0-0 to 0-π. (c) explain why your answers in (a) and b) make sense, given that λ means mass per unit length. then repeat part (a) above, but now with the density not constant, but rather given by λ (x λο ( ) where λ,-const.