The kinetic energy of the air travelling at 20m/s, which passes through
the circular area in 1 second is 5.4 x 10⁵ J.
What is kinetic energy?
The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as
K.E = 1/2 mv²
Given the wind is blowing directly towards the wind turbine at a speed of 20 m/s. At this wind speed, 7500 kg of air passes every second through the circular area swept out by the blades.
Substitute the values, we have
K.E = 1/2 x 7500 x (20)²
K.E = 15 x 10⁵ J
Hence, the kinetic energy of the air travelling at 20m/s, which passes through the circular area is 15 x 10⁵ J.
To know more about kinetic energy, refer: brainly.com/question/12669551
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<u><em>[NOTE: THIS IS AN INCOMPLETE QUESTION. THE CMPLETE QUESTION IS: the wind is blowing directly towards the wind turbine at a speed of 12 m/s. at this wind speed, 7500 kg of air passes every second through the circular area swept out by the blades. Calculate the kinetic energy of the air travelling at 12m/s, which passes through the circular area in 1 second.]</em></u>
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The correct answer would be option A, expands; contracts.
Arctic sea ice naturally expands during the dark, cold winters and contracts during the spring and summer.
Explanation:
There are five big oceans in the world. Arctic ocean is one of these oceans. Arctic Ocean is the shallowest and smallest of all five oceans.
Some oceanographers call the Arctic Ocean as Arctic Sea, where as International Hydrographic Organization recognizes the Arctic Ocean as an Ocean.
Arctic ocean Ice expands during the dark and cold winters. It becomes more solid, but in summers and spring, the Arctic Oceans ice or Arctic Sea ice contracts. This is a natural phenomenon which takes place at arctic ocean as well.
Learn more about Arctic Ocean at:
brainly.com/question/6422849
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