The power generated by a wind turbine is proportional to the cube of the wind velocity. Inspired by the acceleration of a fluid in a nozzle, someone proposes to install a reducer casing to capture the wind energy from a larger area and accelerate it before the wind strikes the turbine blades, as shown in Fig. P5-145. Evaluate if the proposed modification should be given a consideration in the design of new wind turbines. Problems designated by a C are concept questions. and students are encouraged to answer them all. Problems designated by an E are in English units, and the SI users can ignore them. Problems with the icon are comprehensive in nature and are intended to be solved with appropriate software. 248
The power generated by a wind turbine is proportional to the cube of the wind velocity. Inspired by the acceleration of a fluid in a nozzle, someone proposes to install a reducer casing to capture the wind energy from a larger area and accelerate it before the wind strikes the turbine blades, as shown in Fig. P5-145. Evaluate if the proposed modification should be given a consideration in the design of new wind turbines. Problems designated by a C are concept questions. and students are encouraged to answer them all. Problems designated by an E are in English units, and the SI users can ignore them. Problems with the icon are comprehensive in nature and are intended to be solved with appropriate software. 248
Solution Summary: The author explains that the proposed modification in the design of new wind turbine should be considered.
The power generated by a wind turbine is proportional to the cube of the wind velocity. Inspired by the acceleration of a fluid in a nozzle, someone proposes to install a reducer casing to capture the wind energy from a larger area and accelerate it before the wind strikes the turbine blades, as shown in Fig. P5-145. Evaluate if the proposed modification should be given a consideration in the design of new wind turbines.
Problems designated by a C are concept questions. and students are encouraged to answer them all. Problems designated by an E are in English units, and the SI users can ignore them. Problems with the icon are comprehensive in nature and are intended to be solved with appropriate software. 248
6-28 Commercially available large wind turbines have blade span diameters larger than 100 m and generate over 3 MW of electric
power at peak design conditions. Consider a wind turbine with a 75-m blade span subjected to 25-km/h steady winds. If Page 285
the combined turbine-generator efficiency of the wind turbine is 32 percent, determine (a) the power generated by the
turbine and (b) the horizontal force exerted by the wind on the supporting mast of the turbine. Take the density of air to be 1.25
kg/m³, and disregard frictional effects on mast.
25 km/h
75 m
The system consisting of objects with mass ma 1 (kg), mg 2,kg) and massless and frictionless pulleys
and ropes is as shown in the figure. At t 0, the force F = 101 (N) starts pulling the middle pulley upwards.
Find the velocity of object A in (m/s) when the object B loses contact with the ground? g = 10 (m/s?)
F = 10t
A) 5
В) 40
C) 10
D) 20
E) 90
A spring with spring constant 7 N / m collects 5 grams from a toy gun can throw. The barrel of the pistol is 13 cm long and the barrel and bullet constant friction force between 0.030 N. The bow on the gun is 4cm how fast the cannon fires from the gun when compressed (from conservation of energy calculate).
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