Asample of a solid substance has a mass m and a density ? 0 at a temperature t0. (a) find the density of the substance if its temperature is increased by an amount ? t in terms of the coefficient of volume expansion ? . (use any variable or symbol stated above as necessary.) (b) what is the mass (m') of the sample if the temperature is raised by an amount ? t? (use any variable or symbol stated above as necessary.)