Ahollow sphere is constructed of pure aluminum with an inner diameter of 4 cm and an outer diameter of 8 cm. the sphere is covered with a 1-cm layer of insulating material having k = 50 w/m · k and the outside of the insulation exposed to h = 20 w/m2.k and t = 10c. the inside temperature of the sphere is maintained at 100c. (a) sketch the thermal resistance network and (b) determine the heat loss to the ambient.

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

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Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj