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Two identical 3 in. major-diamter power screws (single-threaded) with modified square threads are used to raise and lower a 50-ton sluice gate of a dam. Quality of construction and maintenance (including lubriation) are good, resulting in an estimated friction coefficient of only 0.1 for the screw. Collar friction can be neglected, as ball thrust bearings are used. Assuming that, because of gate friction, each screw must provide a lifting force of 26 tons, what power is required to drive each screw when the gate is being raised at the rate of 3ft/min? What is the corresponding rotating speed of the screws?
a 1.5 inch thick steel plate and a 0.5 inch thick cast iron plate are compressed with 14- 20 unc grade 5 bolt and
What should the diameter of the nozzle outlet be in inches and what is the mass flow rate of steam through the nozzle in lbm/min?
You have a 120 Ω quarter bridge 2 wire set up with Sg=2.10 and an unknown lead wire resistance. A 59880Ω calibration resistor is switched in parallel to the gage only and a recording instrument is set to give a -100 mm deflection for this calibrat..
the free-moving piston-cylinder device shown contains 5kg of hydrogen initially at a temperature of 400degc. when
a beam consists of three planks connected as shown by 3/8 in diameter bolts spaced every 12in.along the longitudinal axis of the beam.knowing that the beam is subjected to a 2500lb vertical shear, determine the average shearing stress in the bolts..
consider a concentric tube annulus for which the inner and outer diameter are 25 and 50 mm. water enters the annular
a piston cylinder device initially contains 0.5 kg of r134a at 200 kpa and a specfic volume of 0.07 m3kg. at this point
a temperature sensor has a transfer function of 5 mvoc with an accuracy of plusmn 1.5 a find the possible range of the
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
Estimate the mass flow rate of fuel into the engine in kg/h.
oxygen is flowing through a nominal 2 inch schedule 40 steel pipe pipe at a velocity of 10 fts. the oxygen is at a
A long electric wire of radius r0 generates heat at rate of q'''. The surface is maintained at uniform temp of T0. Write heat equation and boundary conditions for steady state one dimensional conduction.
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