The spectral transmissivity of plain and tinted glass can be approximated as: Plain glass: τA = 0.9 0.3 μm < λ < 2.5 um
Tinted glass: τA = 0.9 0.5 μm < λ < 1.5 um

Outside the noted ranges, the transmissivity is zero for both glasses. Compare the solar heat flux transmitted through both glasses, assumingsolar irradiation as black body emission at 5800 K.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2