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An electric heater in the form of a horizontal disk of 57 mm diameter is used to heat the bottom of a tank filled with engine oil at a temperature of 5 degrees Celsius. Calculate the power required to maintain the heater surface at 70 degrees C.
There are two thermal reservoirs: the hot reservoir is at 1200 K and the cold reservoir is at 600 K. If you wanted to transfer 100 kJ from on reservoir to the other, what would the change in entropy of the two reservoirs be?
a 250ft square shell and tube heat exchanger was purchased for 13500 in 1994 when the index value was 830. estimate the
air enters an ideal diffuser operating at steady state at 1 bar -3degc and 260 ms and exits at with a velocity of 130
approximately 250 mol of an ideal gas expands adiabatically and irreversibly from 2 m3 to 5 m3 against a constant
two streams of air mix together. the first stream state 1 has 4 kgs of air entering at 300k 1 bar. the second stream of
Air, initially at 220 kPa and 450 K undergoes a polytropic state change to 374 kPa and 495 K. What is the polytropic exponent of this process? Saturated water vapor is contained in a rigid container. Heat is then added until the pressure and temperat..
Consider a velocity field where the x and y components of velocity are given by u=(cy/(x^2 + y^2)) and v= (-cx/(x^2 + y^2)) where C is constant. Calculate the vorticity of the vortex flow
Given the roughness of the pipe
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 machine of mass 125kg supported by springs of total stiffness k750knm. the rotating parts have a mass of 2.5kg which
in an automotive gas turbine the centrifugal compressor is driven at 40000 rpm by an axial turbine. the compressor
determine a) the angular accelerations of gears B and C, b) the accelerations of the points on gears B and C which are in contact when t = 0.5 s.
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