A tank of water has been outdoors in cold weather, and a slab of ice 4.8 cm thick has formed on its surface (see the figure). The air above the ice is at -7.4°C. Calculate the rate of formation of ice (in centimeters per hour) on the ice slab. Take the thermal conductivity of ice to be 0.0040 cal/s-cm-C°, its density to be 0.92 g/cm?, and its latent heat of fusion to be 333 kJ/kg. Assume no energy transfer through the tank walls or bottom. Air Ice Water Number i 0.40 Units cm/h

A temperature difference of 52 K is maintained between the sides of a 3.6-cm thick slab of plywood. What is the rate of heat transfer through a 44-cm2 area of the slab?

The Kilauea volcano in Hawaii is the world’s most active, disgorging about 5×105 m3 of 1200ºC lava per day. What is the rate of heat transfer out of Earth by convection if this lava has a density of 2700 kg/m3 and eventually cools to 30ºC ? Assume that the specific heat of lava is the same asthat of granite.

A tank of water has been outdoors in cold weather, and a slab of ice 4.8 cm thick has formed on its surface (see the figure). The air above the ice is at -7.4°C. Calculate the rate of formation of ice (in centimeters per hour) on the ice slab. Take the thermal conductivity of ice to be 0.0040 cal/s-cm-C, its density to be 0.92 g/cm2, and its latent heat of fusion to be 333 kJ/kg. Assume no energy transfer through the tank walls or bottom. Air Ice Water Number i Units