Assume that a sample of burning PMMA was weighed as it burnt, giving the average mass loss

rate of $5\mathrm{.}2\frac{g}{s}.$ The complete heat of combustion for PMMA has been found to be roughly $25k\frac{J}{g}.$

Assuming that the combustion efficiency is $85\%,$ estimate the resulting energy release rate. Also,

give a rough estimate of the size of the burning PMMA slab $($assume an average burning rate

per unit area of $25\frac{g}{m^2(s)}.$