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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?
Design a garage door controller using PLC Ladder Diagram (RSLOGIX 500 PLC SIMULATOR)
three wires are made of the following materials. one wire is pure al. one wire is pure cu. one wire is pure ni. which
Compute the upward force on the device from water and air. Use the results of Problem as well as any other data given in that problem that you may need.
consider a simple brayton cycle using air as the working fluid has a pressure ratio of 12 has a maximum cycle temp of
it is desired to study the effect of turbine inlet temperature on the performance of an ideal steam rankine cycle.
a solid cylinder of diameter d2cm and length l10cm is heated such that the temperature distribution is only in the
The remaining gas is pure hydrogen and exerts a pressure of 0.190 atm when measured at the same values of T and V as the original mixture. What was the composition of the original mixture in mole percent?
carbon monoxide and water vapor react to form carbon dioxide and hydrogen. water at 25c is fed to the reactor 50 in
Post your response (1,000 - 1,250) to the following questions in both the discussion and in the assignment tool.How do senior executives play an essential role in contract management?•Why do senior executives play an essential role in contract manage..
The acceleration due to gravity at sea level is g = 9.81 m/s2 . What is the person"s weight at sea level? The acceleration due to gravity on the moon is g = 1.62 m/s2 . What would the person weigh on the moon?
a gasoline engine receives air at 10 0c 100 kpa having compression ratio of 91 bynbspvolume. the heat addition by
two kg of propane are initally saturated liquid at 0c. it undergoes an isentropic process that cools it to -40c.a what
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