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4A. Calculate the ratio of thermal boundary layer thickness to hydrodynamic boundary layer thickness tor (i) Air at 1atm. and 20C and (ii) glycerine at 20C. 4B. A fluid is streaming over a flat surface maintained at a different temperature. Measurements of the loca velocity and temperature show that the hydrodynamic boundary layer is 10 times thicker than the therma boundary layer. What kind of fluid could this be ? - (a)Water(b)Mercury(c)Air(d)Engineoil(Explainyourchoiceofanswer) 4C. The total heat transfer rate between a pipe and water flowing through the pipe can be expressed as : Q=hAT or alternatively, Q=mCpT=vACpT. Therefore, hAT=vACpTh=vCp. Is this correct, and if not, what is wrong here