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A 3-cm-diameter cylinder rotates inside a ?xed 4-cm-diameter cylinder with 40-C SAE-30 oil ?lling the space between the 30-cm-long concentric cylinders. Write the velocity pro?le and calculate the torque and the power required to rotate the inner cylinder at 2000 rpm assuming a laminar ?ow.
determine the required size for a square bar to be made from aisi 1213 cold-drawn steel. it carries a constant axial
an ideal diesel cycle with air as the working fluid has a compression ratio of 22 and a cutoff ratio of 2.5. at the
a closed tank v 0.35 ft3 containing 10 lbm of water initially at 77f is heated to 350f by a heat pump that is
a tube with elastic modulus of 75 gpa is used to support a compressive load. it is required that this tube must not
a 2.5 inch diameter schedule 40 pipe subject to 5000 pounds axial compression and a bending moment of 2500 in lbs.
consider an ideal combined cycle with compression ratio of 71 in which air enters the compressor at 295 k enters the
water enters a smooth-thin-walled tube of 1 inch in internal diameter at 50f and leaves at 150f. heat is supplied to
Compared to cross-linked polymers, linear polymer chains:
the dry bulb temperature of the air in a 4m by 3m underground opening is 26 degc. the corresponding moisture content is
Ten pounds-mass of R-22 is at an initial volume of 4.059 ft3 and pressure of 200 psia. It is compressed isobarically until its volume is two-thirds of its initial volume. The piston is then held in place as the refrigerant cools until its temperature..
an air conditioning system is used to maintain a house at 70f when the temperature outside is 90f. if the air
To compare the maximum temperature each surface reaches for a given input power when in free convection.
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