Asmooth sphere with a diameter of 90 mm is observed to fall through air at a temperature of 100 c with a terminal speed of 100 m/s. a) calculate the weight of the sphere. b) could the speed be increased by making the surface of the sphere rougher? support your answer. c) for these conditions, can the air be considered incompressible?

The higher the astm grain-size number, the coarser the grain is. 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

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?