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Suppose you are outside on a cold day with no gloves. Assume your hands have an area of 0.01 m2. The temperature of your hands is 36 C and the temperature outside is 0 C. a) If it is calm and the heat exchange coefficient is h = 5 W/m2· K , what is the rate of heat transfer in kJ/s from your hands? b) If it is windy and the heat exchange coefficient is h = 200 W/m2· K , what is the rate of heat transfer in kJ/s from your hands?
Consider a cold air-standard Diesel cycle. Operating data at principal states in the cycle are given in the table below.For k=1.4 Cv=0.718kJ/(kg*k), and Cp= 1.005 kJ/(kg*K)
Lawn mower engines normally have finned surfaces directly attached to the engine block, with no radiator, in order to achieve the required cooling. Why might the cooling strategies be different in these two applications?
a cast-iron bar 2 in. in diameter and 5 ft. long is surrounded by a shell of structural steel 0.25 in thick. compute
a heat engine is composed of of a monatomic ideal gas which runs in the following cycle at point a the pressure is 2.6
in a laboratory steam is condensed at atmospheric pressure i.e. 212degf on the shell-side of a vertically-oriented
a large plate contains a central crack of length 2 mm and is subjected to a cyclic stress normal to the crack which
Calculate the time rate of change dHB/dt of angular momentum about point B when the particle passes the bottom of the guide at C.
what is the primary growth front? what is the secondary growth front? what happens when they approach each other? what
a completely mixed chemical reactor has an in fluent flow with conc. 150 mgl of a and a flow rate of 100 galmin 380
a structural compenent is formed with aluminum alloy 6061-t6 with youngs modulus e68.9 gpa and shear modulus g 26 gpa.
Fluid Statics: Submerged Submarine, A submarine is at a depth of 2000 ft from the water surface. The atmospheric pressure above the water is at 14.7 psia
in an overhead smash a tennis player strikes the ball with the center of the head of the racquet. say the contact
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