Asmall oxidized horizontal metal tube with an od of 0.0254 m and 0.61 m long with a surface temperature at 588 k is in a very large furnace enclosure with firebrick walls and the surroundings air at 1088 k. the emissivity of the tube is 0.60 at 1088 k and 0.46 at 588 k. calculate the heat transfer rate to the tube by radiation.

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.