A cylinder fitted with aa frictionless piston contains an ideal gas at temperature T and pressire P. The gas exapnds isothermally and reversibly until the pressure is p/3. Ehich statement is true regarding the work done by the gas during expansiona. Equal to the heat absorbed by the gas. b. Equal to the internal energy change of the gas. c Equal to the enthalpy change of the gas. d. Equal to 11 P time the volume change in the gas. e. Greater than the heat absorbed by the gas

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

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?

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length