Question

l methods of heat transfer. The figure to surface the right shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a device designed specifically to slow down all forms of heat transfer. Explain the functions of the various parts, such as the vacuum, the silvering of the 2 glass walls, the rubber support& spring centering device, the air layer, and the screw on stopper up top. cei Hot or cold iquid Vac 2) If 850 J of heat is added to 4x 3 x2 cm block of Rubber support copper initially at 22.0 °C, what will its final temperature be? How about the same size block of ice? 15-Q 13, that's chap 15 conceptual question #13 Which cyclical process represented by the two closed loops, ABCFA and ABDEA, on the PV diagram in the figure below produces the greatest net work? Is that process also the one with the smallest work input required to return it to point A? Explain your responses. The two cyclical processes shown on this PV diagram start with and return the system to the conditions at point A, but they follow different paths and produce different amounts of work 15-P17, chap 15 problem 17 (a) A cyclical heat engine, operating between temperatures of 450° C and 150 C produces 4.00 MJ of work on a heat transfer of 5.00 MJ into the engine. How much heat transfer occurs to the environment? (b) What is unreasonable about the engine? (c) Which premise is unreasonable? 4)

#2

Answer 1