A block of material with a cross-sectional area of 0.10 m 2 and a thickness of 0.15 m has one side maintained at 90°C and the other end maintained at 20°C. Determine the rate of heat transfer via...

A block of material with a cross-sectional area of 0.10 m²
and a thickness of 0.15 m has one side maintained at 90°C and the other end maintained at 20°C. Determine the rate of heat transfer via conduction if the material is (a) nickel (k
= 90.7 W/m
K), (b) common brick (k
= 0.72 W/m
K), and (c) fiberglass (k
= 0.04 W/m
K).