Air at 4 × 10−4 kg/s and 20°c enters a rectangular duct that is 1 m long and 4 mm × 16 mm on a side. a uniform heat flux of 500 w/m2 is imposed on the duct surface. what is the temperature of the air and the duct surface at the outlet?

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

the answer would be c. motion and direction

i hope this : )

measure their densities same density, same sub