Boiling Eggs
An ordinary egg can be approximated as a 5-cm-diameter sphere (Fig). The egg is initially at a uniform temperature of 5^{\circ} C and is dropped into boiling water at 95^{\circ} C . Taking the convection heat transfer coefficient to be h = 1200 W / m ^{2} \cdot{ }^{\circ} C , determine how long it will take for the center of the egg to reach 70^{\circ} C .