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
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
You are designing a hydraulic lift for an automobile garage. It will consist of two oil-filled cylindrical pipes of different diameters. A worker pushes down on a piston at one end (d = 25cm), raising the car on a platform at the other end (d=?). To handle a full range of jobs, you must be able to lift cars up to 3000 kg, plus the 700 kg platform on which they are parked. To avoid injury to your workers, the maximum amount of force a worker should need to exert is 100 N.
What should be the diameter of the pipe under the platform?
If the worker pushes down with a stroke 50 cm long, by how much will he raise the car at the other end?
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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