A 5-gallon tank used by a refrigerator repair person that initially contains a two-phase mixture of R134a at 20°C develops a small leak at the top. The process is slow enough such that the temperature remains constant at 20°C. If the initial contents are 90% liquid by mass, then determine the heat transfer (kJ) that occurred over the time it took for all the liquid to disappear in the tank (i. e. final state of saturated vapor at 20°C).

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

Amixture of slurry and mud is to be pumped through a horizontal pipe of diameter 500 mm. the fluid behaves as a bingham plastic with a yield stress of 30 pa and viscosity 0.04 pa.s. describe the effects of the shear stress through a transverse section of the pipe by plotting the variation in shear stress and velocity profile: (i) just before the slurry starts to move (ii) as the slurry flows when the pressure gradient is double that in part (i)