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Determine the convection heat loss from both the top and the bottom of a flat plate at Ts = 80°C with air in parallel flow at Too = 25°C, uoo = 3 m/s. The plate is t = 1 mm thick, L = 25 mm long, and of depthw = 50 mm. Neglect the heat loss from the edges of the plate. Compare the convection heat loss from the plate to the convection heat loss from an Lc = 50-mm-long cylinder of the same volume as that of the plate. The convective conditions associated with the cylinder are the same as those associated with the plate.
r-134a flows through a refrigeration system at a rate of .12 kgs. at the entrance to the adiabatic compressor the
an isolated system consists of a closed copper vessel of mass 0.1 kg containing 1 kg of liquid water each initially at
A balanced-cross-flow compact heat exchanger is required for an air heating system that processes 0.5 kg/s air. The inlet temperature for the hot water is 295 K, and the cold air enters at 270 K to be heated to 287 K. The inlet pressure for the hot w..
tow forces p and q are applied as shown at a point a of a hook support. knowing that p 75 n and q125 n determine
Rod AB is bent into shape of a circular arc adn is lodged between two pegs D adn E. It supports a load P at end B. Neglecting friction and the weight of the rod, determine the distance c corresponding to equilibrium when a = 1 in and R = 5 in.
determine the work required to compress steam isentropically from 100 kpa to 1 mpa assuming that the steam exists as a
An adiabatic vessel contains steam at 180 [C] and 116 [kPa]. The volume is 0.5 [m^3]. Steam at 150 [C] with a quality of 0.85 is fed into the vessel until the flow stops. What are the final pressure and temperature inside the tank? What is its qualit..
a piston cylinder device initially contains 1.4 kg saturated liquid water at 200 oc. now heat is transferred to the
suppose the rocket was initially on a circular orbit around earth with a period of 1.2 days.a what is its orbital
a cycle consists of two isochoric and two isothermal process. the volume variation vmax vmin in the cycle is r fold
a freight car of mass 1800 kg is timed at 4.2ms just after it runs into a spring-loaded bumper at the end of the track.
an insulated piston-cylinder device initially contains 9.647 lb of air at 20 psia and 60ordmf. then 1000 btu per lb of
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