Within the next 5 to 10 years, wind turbines with rotor diameters of 180 m are anticipated to be developed and installed in Europe. If the blades of such turbine turn at a rate of 5 revolutions per minute, what is the speed of a point located at a tip of a blade? Express your answer in ft/s, m/s, km/h, and mph.
What will be an ideal response?
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The primary system of measurement used by most of the world is the ____________________ system.
Fill in the blank(s) with the appropriate word(s).
Which of the following methods are allowed to keep hot water available quickly at a remote plumbing fixture? Select all that apply.
A) Recirculating system using a pump. B) Recirculating system using gravity flow. C) Remote undercounter tank type heater.
On rack system controls, why are compressors “stepped” to stop or start?
a. To match which compressors should be running to the load on the rack. b. To bring on compressors according to the discharger pressure. c. To prevent wearing out all the compressors at one time.
If a 1 M? resistor, 0.47 M? resistor and 0.5 M? resistor are connected in parallel across an 18 V source, what is the total current if the 1 M? resistor opens?
A) 92.3 mA B) 74.3 mA C) 74.3 ?A D) 92.3 ?A