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Two identical 3 in. major-diameter 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 lubrication) 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 3 ft/min? What is the corresponding rotating speed of the screws?
the compound beam is fixed at a and supported by a rocker at b and c. there are hinges pins at d and e. take f 14kn.
hot gas inside an internal combustion engine of a car expands in a reversible manner during the expansion stroke to
water is the working fluid in a vapor power cycle. the pressure and temperature at the turbine inlet are 1600 psia and
Air flows through the fine mesh gauze shown in Fig. P8.65 with an average velocity of 1.50 m/s in the pipe. Determine the loss coefficient for the gauze.
an electric motor of mass 75 kg and speed 1200 rpm is mounted at the free end of a cantilevered steel beam of length 5
Make reasonable assumptions as to soil properties and calculate the total, neutral, and effective stresses at 3,6, II, and 16 in below the ground surface.
This signal is read by the microcomputer and is used to modify the switching signal so as to correct the motor speed. Using a schematic diagram, describe the hardware needed to implement this control scheme. Explain the operation of the control sy..
argon gas enters a turbine operating at steady state at 100 bar 325 k and expands adiabatically to 40 bar 235 k with no
a piece of 0.1 c steel is to be carburized at 930c until the carbon content is raised to 0.45 c at a depth of 0.020 in.
a 110 scale model of an automobile is tested in a pressurized wind tunnel. the test is to stimulate the automobile
Derive an expression for the maximum theoretical efficiency of a heat engine utilizing this heat source versus time. Plot the maximum theoretical efficiency versus time for 10 years. Assume that there is sufficient ocean water available to maintai..
a stepladder consisting of two legs pinned together at c is resting on a rough floor. will a 160-lb worker be able to
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