An ordinary egg can be approximated as a 5.5-cm-diameter sphere whose properties are roughly k=0.6W/m⋅K and α=0.14×10−6m2/s. The egg is initially at a uniform temperature of 8∘C and is dropped into...

An ordinary egg can be approximated as a 5.5-cm-diameter sphere whose properties are roughly k=0.6W/m⋅K and α=0.14×10−6m2/s. The egg is initially at a uniform temperature of 8∘C and is dropped into boiling water at 97∘C. Taking the convection heat transfer coefficient to be h=1400W/m2⋅K, determine how long it will take for the center of the egg to reach 70∘C.