4. On a cold winter day, the 55 km/h wind flows in parallel over the wall of a 4 m high and 10 m long house as shown in the figure. The external environment temperature is 5°C and the surface...

Extracted text: 4. On a cold winter day, the 55 km/h wind flows in parallel over the wall of a 4 m high and 10 m long house as shown in the figure. The external environment temperature is 5°C and the surface temperature of the wall is 12°C. Under these conditions, find the heat loss from the wall by convection and the friction force acting on the wall surface. If the wind speed doubles, what will be the heat loss from the wall by convection and the friction force acting on the wall surface? Attic space 4 m Air 5°C 55 km/h 10 m 12°C