You want to know what effect convection will have on evaporation if you leave a petri dish of agar uncovered on the bench or in the fume hood (both at 293 K and 1.013 x 10°Pa, so you compare mass ransfer coefficients (kc) (How many times faster/slower?). Water evaporates from the exposed area into he still lab air at a rate of f 2 m/s at a rate of 2.29 x 104 mole/s (WA). 5.73 x 10-6 mole/s (WA). In the fume hood) it evaporates into an air stream

A thin metal plate 1 mx 1 m is placed on a rooftop. It receives radiant heat from the sun directly at the rate of 170 W/m². If heat transfer from the plate to the ambient occurs purely by free convection, calculate the steady state temperature of the plate. Assume that there is no heat loss from the bottom of the plate. The ambient temperature is 25°C.

31 For approximate calculations, the sun may be considered a black body, emitting radiation with a maximum intensity at λ = 0.5 microns (5000 Å). With this information, estimate (a) the surface temperature of the sun, and (b) the emitted heat flux at the sun's surface.

A copper electric wire of radius R, = 1 mm is isolated by a layer of PVC so that the outer radius of the wire Rg = 2 mm, as shown in Figure below. The wire exchanges heat with the air at 20°C according to a heat transfer coefficient h=20 W/m2°c: Given that : k=copper electrical conductivity=4.0 × 1070hm-'m¯! kpvc= PVC thermal conductivity = 0.3- m°C kco = copper thermal conductivity = 100 m°C %3D (amp/m)² And that the electrical heating source is given by : S, amp²s /kgm³ If the temperature (T,) on the outer surface (r = RG) is 25°C, what is the electrical current C (amp) that passes through this wire? Dont forget to state your hypothesis clearly.     Hi, Could you please tell me what the book's name is? Thank you!