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1. Each propeller of the twin-screw ship develops a full-speed thrust of 300 kN. In maneuvering the ship, one propeller is turning full speed ahead and the other full speed in reverse. What thrust P must each tug exert on the ship to counteract the effect of the ship's propellers?
2. A lug wrench is used to tighten a square-head bolt. If 50-lb forces are applied to the wrench as shown, determine the magnitude F of the equal forces exerted on the four contact points on the 1-in. bolt head so that their external effect on the bolt is equivalent to that of the two 50-lb forces. Assume that the forces are perpendicular to the flats of the bolt head.
Drinking water at 10oC for an office complex must be pumped along a horizontal section of PVC pipe 50 m long at 2 m/s. The pipe has a nominal diameter of 62.5 mm and is Schedule 40. What is the head loss in m?
Consider laminar flow of a fluid through a square channel with smooth surfaces. Now the average velocity of the fluid is doubled. Determine the change in the head loss of the fluid. Assume the flow regime remains unchanged.
In the an ideal turbo jet, the engine is designed such that the turbine work is divided equally between the compressor and the propeller. The gas from the turbine discharges to a nozzle for additional thrust.
A piston cylinder device contains 1 kg of steam at 500C and 2 MPa. The piston device is surrounded by a water vapor mixture with a quality of x=0.6. What is the maximum amount of heat that can be transferred between the piston cylinder device and the..
A reversible heat engine operates between 397 degrees C and 7 degrees C and rejects 20 kJ/min to the environment. The total net work output of the engine is used to drive a reversible heat pump which is supplied with heat from the environment at 7 de..
an air-standard dual cycle has a compression ratio of 9. at the beginning of compression p1100kpa t1300k and v114l. the
water vapor enters a turbine operating at steady state at 30 mpa 600 oc and expands adiabatically to 6 mpa. if the
Prepare a research paper on Piezoelectricenergy harvesting from torsional vibrations in internal combustion engines.
The actual (irreversible) components of a small Brayton cycle gas-turbine engine are shown. The cycle pressure ratio is 15 and the maximum turbine temperature is 1600 K. The turbine and the compressor are insulated and have isentropic efficiencies of..
The discharge coefficient of a Venturimeter was found to be constant for rates of flow exceeding a certain value. Show that for this condition the loss of head due to friction in the convergent parts of the meter can be expressed as KQ2 m where K is ..
Acrylic latex paint can be described as a Bingham plastic with a yield stress of 200dyn/cm^2, a limiting viscosity of 50 cP, and a density of 0.95 g/cm^3. What is the maximum thickness at which a film of this paint could be spread on a vertical wall ..
a long aluminum bar has a diameter of 11 cm and is initially uniform in temperature at 300 c. if it suddenly exposed to
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