Air in a piston-cylinder device is compressed from 25 c and 100 kpa to 500 kpa during a polytropic process for which pv.3- constant. the air temperature after compression (in c) is : (a) 182 (b) 156 (c) 1207 (d) 115

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

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?

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?