1. The heat flow rate through a 3 cm thick wood board for a temperature difference of 30°C between the two surfaces is 120 W/m 2 . Calculate the thermal conductivity of the wood. 2. A hot plate...

1. The heat flow rate through a 3 cm thick wood board for a temperature difference of 30°C between the two surfaces is 120 W/m². Calculate the thermal conductivity of the wood.

2. A hot plate maintained at a temperature of 120°C dissipates heat at the rate of 7500 W/m²
to the ambient air at 30°C. Calculate the heat transfer coefficient for convection between the plate and the air.