Along cylinder of 30-mm diameter, initially at a uniform temperature of 750 k, is suddenly quenched in a large, constant-temperature oil bath at 350 k. the cylinder properties are k= 1.7 w/m·k, c= 1600 j/kg·k, and ρ= 400 kg/m3, while the convection coefficient is 51 w/m2·k. (1) use the one-term approximation method to solve for the fourier number.? (2) solve for the time required for the surface of the cylinder to reach 500 k, in sec.?