What is the main force that acts on a bridge?
A snow
B water
C weight
D wind

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody