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A piece of hot metal should be cooled rapidly (quenched) to 25°C, which requires removal of 1000 kJ from the metal. The cold space that absorbs the energy could be a bath of liquid water and ice. Calculate the change of entropy of the cooling medium.
A mass- and atmosphere-loaded piston/cylinder contains 2 kg of water at 5 MPa, 100°C. Heat is added from a reservoir at 700°C to the water until it reaches 700°C. find the work, heat transfer, and total entropy production for the system and surroundings.
two rigid tanks that are each 20 ft3 are connected by a line containing a control valve that is initially closed. tank
consider the 2-dimensional flow field for which uaxy vby2 where a1m-1 x s-1 b-0.5m-1 x s-1 and the coordinates are
a explain why the apparatus of problem 2.17 cannot be used to obtain an accurate measurement of the aerogels thermal
a piston-cylinder device containing water undergoes a thermodynamic cycle consisting of the following three
A piston-cylinder device is insulated and contains 0.005 m3 of saturated liquid water at a constant pressure of l50 kPa. An electric resistance heater inside the cylinder is now turned on, and 1800 kJ of energy is transferred to the steam.
a point charge causes an electric flux of -750 nmc to pass through a spherical gaussian surface of 10.0 cm radius
a hydraulic cylinder has a piston of cross sectional area 45cm2 and a constant working fluid pressure of 2.2mpa. the
r-134a is contained in a sealed glass vessel at 50oc. as it is cooled droplets are noted condensing on the sidewalls at
a rigid well-insulated tank contains a two-phrase mixture of ammonia with .0025ft3 of saturated liquid and 1.5 ft3 of
a round compression member with both ends pinned and made of aisi cold-drawn steel sy441 mpa e207 gpa is to be used in
a domestic water heater holds 189 l of water at 60 degrees c 1 atm. determine the exergy of the hot water in kj. to
consider a gas turbine cycle with two stages of compression and two stages of expansion. the pressure ratio across each
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