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A cantilevered steel pipe tower, 80 m tall is being considered for a new wind turbine. The weight of the turbine is 3,400 kN. The tower under consideration will have a constant outer diameter of 4 m and a wall thickness of 6 cm. The turbine is to have three blades. The nominal rotor speed is 12 rpm. Would the tower be considered stiff, soft or soft–soft? Suppose that a tapered tower is being considered instead. How would the natural frequency be analyzed? Assume that the weight density of steel is 76.8 kN/m3 and its elasticity is 2.07 x 1011 Pa.
A strain gauge is used to measure the top surface strain on an end loaded cantilevered beam. From the end of the beam to the location of the strain gauge is L=12.1 inches. The width of the beam is w=0.99 inches, and the the thickness of the beam is t..
a small household refrigerator is used to cool 20 liters of water initially at 22c. the cop of the refrigerator is 2.40
a 2 lb brick slides off of a roof with a slope of tan-134. that is about when the brick leaves the roof it is 30 ft off
at an amusement park there are 200kg bumper cars a b and c. that have riders with masses of 40kg 60kg 35kg
a robot unloads a finished component from a machine and places it on a gravity conveyor. the conveyor accelerates from
(a) Find the rate of heat transfer (kW) to the water. (b) Draw a schematic of the system. (c) Determine the air outlet temperature (°C)
Refrigerant-134a at 1 MPa and 100°C is throttled to a pressure of 0.8 MPa. Determine the reversible work and exergy destroyed during this throttling process. Assume the surroundings to be at 30°C.
results of a tensile test on sae 1035 cd steel yieled a mean value of the ultimate strength of 86.2 ksi and a standard
a 500 kw compressor is being designed to operate on air in a space where the temperature is 300 k and pressure is 90
water flows into a volume that contains a sponge with a flow rate of 0.02 m3s. it exits the volume through two tubes
A rigid wall, insulated container is divided into two regions by a removable wall. One region contains 0.1 lbm of CO at 100F, while the other region contains 0.2 lbm of CO at 150?F. A stirrer is inserted into the container and when the wall between t..
a distillation column is purchased for 300000. the firm finance 40 of the investment with its own resources and the
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