Homework Answers
Wind turbines extract kinetic energy from the air around them, and since less energy makes for weaker winds, turbines do indeed make it less windy. Technically speaking, the climate zone right behind a turbine (or behind all the turbines on a wind farm) experiences what's called a "wind speed vacuum," or a "momentum deficit." In other words, the air slows down.
so yes it would be windier behind the wind generators if they weren't there.
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Part B That is would locations behind the wind blades be windier if the generators weren't...
Part A Does the electric power produced by wind-powered generators affect the speed of the wind?...
Part A Does the electric power produced by wind-powered generators affect the speed of the wind? Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help slowed down sped up kinetic potential Wind-powered generators subtract energy from the wind, so the wind is by interaction with the blades Submit Part B Complete previous part(s)
Constants Part A A model of a helicopter rotor has four blades, each of length 3.80...
Constants Part A A model of a helicopter rotor has four blades, each of length 3.80 m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 460 rev/min What is the linear speed of the blade tip? ΑΣ 58.26 m/s Submit Previous Answers Request Answer X Incorrect; Try Again; 6 attempts remaining Part B What is the radial acceleration of the blade tip expressed as a multiple of...
8. A big metal bead slides due to gravity along an upright friction-free wire. It starts...
8. A big metal bead slides due to gravity along an upright friction-free wire. It starts from rest at the top of the wire, Point A, as shown in the sketch. How fast is it traveling as it passes Point B?- Point D?- Point E? Maximum speed occurs at Point 5 m 9. Rows of wind-powered generators are used in various windy locations to generate electric power. Does the power generated affect the speed of the wind? That is, would...
Please let it be legible, thanks in advance! Hw 1 P 7 Modern wind turbines are...
Please let it be legible, thanks in advance!
Hw 1 P 7
Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high-many times higher than the wind speed. A turbine has blades 51 m long that spin at 14 rpm (Figure 1) Part A At the tip of a blade, what is the speed? Express your answer with the appropriate units. Figure 1 of 1 НА...
Review Icon Modern wind turbines are larger than they appear, and despite their apparently lazy motion,...
Review Icon Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high-many times higher than the wind speed. A turbine has blades 51 m long that spin at 14 rpm (Figure 1) Part A At the tip of a blade, what is the speed? Express your answer with the appropriate units. Figure 1 of 1 H Value Units Submit Request Answer At the tip of a...
(ii) (a) Why do wind turbines have three blades? [2 marks] (b) Compare and contrast your...
(ii) (a) Why do wind turbines have three blades? [2 marks] (b) Compare and contrast your answer if you choose to use two blades or [4 marks] four blades instead of three blades.
A condition monitoring technique for wind turbine blades is used to detect faults, but is not...
A condition monitoring technique for wind turbine blades is used to detect faults, but is not perfect. It has a sensitivity of 97% (proportion of faulty blades correctly identified) and a specificity of 99% (proportion of blades without faults correctly identified), when used as part of routine maintenance. Assume that 1% of the blades have faults. (a) What proportion of blades tested will receive a negative result, i.e. claiming that they are without faults? In your working, define relevant events....
5. The three rotor blades of a wind turbine can be considered to be long thin...
5. The three rotor blades of a wind turbine can be considered to be long thin rods. Each of the rotor blades is 43 m long and has a mass of 60 Mg. The turbine is spinning at 20 rpm and is generating 2.8 MW of power. This problem DOES need to be written out for your portfolio. NOTES IMAGES DISCUSS UNITS STATS HELP Part Description Answer Chk History nergy of the Determine the kinetic e turbine (include units with...
Constants Part A City A lies directly west of city B. When there is no wind,...
Constants Part A City A lies directly west of city B. When there is no wind, an airliner makes the round trip flight of distance s between them in a flight time of ti while traveling at the same speed in both directions When a strong, steady wind is blowing from west to east and the airliner has the same air speed as before, the round trip takes a flight time of t2 How fast is the wind blowing? km/h...
I would like to know the math behind the answer to A and B, I have...
I would like to know the math behind the answer to A and B, I
have tried several routes and cannot get it right. Thanks in
advance.
Constants Periodic Table A block of inertia m sits on a smooth surface (Figure 1). A light string is attached to it and placed over a solid pulley of inertia 7 m and radius R, and a ball of inertia m is attached to the free end of the string. Part A If...
Part A Does the electric power produced by wind-powered generators affect the speed of the wind? Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help slowed down sped up kinetic potential Wind-powered generators subtract energy from the wind, so the wind is by interaction with the blades Submit Part B Complete previous part(s)
Constants Part A A model of a helicopter rotor has four blades, each of length 3.80 m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 460 rev/min What is the linear speed of the blade tip? ΑΣ 58.26 m/s Submit Previous Answers Request Answer X Incorrect; Try Again; 6 attempts remaining Part B What is the radial acceleration of the blade tip expressed as a multiple of...
8. A big metal bead slides due to gravity along an upright friction-free wire. It starts from rest at the top of the wire, Point A, as shown in the sketch. How fast is it traveling as it passes Point B?- Point D?- Point E? Maximum speed occurs at Point 5 m 9. Rows of wind-powered generators are used in various windy locations to generate electric power. Does the power generated affect the speed of the wind? That is, would...
Please let it be legible, thanks in advance!
Hw 1 P 7
Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high-many times higher than the wind speed. A turbine has blades 51 m long that spin at 14 rpm (Figure 1) Part A At the tip of a blade, what is the speed? Express your answer with the appropriate units. Figure 1 of 1 НА...
Review Icon Modern wind turbines are larger than they appear, and despite their apparently lazy motion, the speed of the blades tips can be quite high-many times higher than the wind speed. A turbine has blades 51 m long that spin at 14 rpm (Figure 1) Part A At the tip of a blade, what is the speed? Express your answer with the appropriate units. Figure 1 of 1 H Value Units Submit Request Answer At the tip of a...
(ii) (a) Why do wind turbines have three blades? [2 marks] (b) Compare and contrast your answer if you choose to use two blades or [4 marks] four blades instead of three blades.
A condition monitoring technique for wind turbine blades is used to detect faults, but is not perfect. It has a sensitivity of 97% (proportion of faulty blades correctly identified) and a specificity of 99% (proportion of blades without faults correctly identified), when used as part of routine maintenance. Assume that 1% of the blades have faults. (a) What proportion of blades tested will receive a negative result, i.e. claiming that they are without faults? In your working, define relevant events....
5. The three rotor blades of a wind turbine can be considered to be long thin rods. Each of the rotor blades is 43 m long and has a mass of 60 Mg. The turbine is spinning at 20 rpm and is generating 2.8 MW of power. This problem DOES need to be written out for your portfolio. NOTES IMAGES DISCUSS UNITS STATS HELP Part Description Answer Chk History nergy of the Determine the kinetic e turbine (include units with...
Constants Part A City A lies directly west of city B. When there is no wind, an airliner makes the round trip flight of distance s between them in a flight time of ti while traveling at the same speed in both directions When a strong, steady wind is blowing from west to east and the airliner has the same air speed as before, the round trip takes a flight time of t2 How fast is the wind blowing? km/h...
I would like to know the math behind the answer to A and B, I
have tried several routes and cannot get it right. Thanks in
advance.
Constants Periodic Table A block of inertia m sits on a smooth surface (Figure 1). A light string is attached to it and placed over a solid pulley of inertia 7 m and radius R, and a ball of inertia m is attached to the free end of the string. Part A If...
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