Posted by **sand** on Tuesday, January 3, 2012 at 8:23pm.

A brick wall with a thermal emissivity of 0.8 is heated by the sun all day and is at a temperature of 25 °C in early evening. A pedestrian walking past the wall feels its warmth radiating in to the cool evening air. The wall has surface area of 5m^2. What is the total out put power of the thermal radiation emitted by the wall? Ignore radiation absorbed by the wall from surrounding bodies.

## Answer this Question

## Related Questions

- physics conduction - a one brick thick wall of 10cm thickness has temperatures ...
- Math - a wall in front of a house is shown below if 3/5 of the wall is brick how...
- physics-heat transfer - consider a brick wall that has been exposed to the sun ...
- physics - A tennis ball (m= 0.2 kg) is thrown at a brick wall. It is traveling ...
- physics - In an electrically heated home, the temperature of the ground in ...
- calculus - A landscape architect wishes to enclose a rectangular garden on one ...
- Physics - A wall is made of a substance whose thermal conductivity is .93 J / (m...
- heat transfer - a plane wall of thickness 10 cm and thermal conductivity of 25w/...
- HEAT TRANSFER - Compute the heat flux thoroughly a 10 cm thick brick wall (k= 0....
- physics - The R-factor for housing insulation gives the thermal resistance in ...