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(A) in your diagram is a flat plane basically. Its surface area can be increased by pulling it upward or downward in the middle for example. The definition in your book is a little confusing because it is from a physics perspective and that is how surface tension is measured; force/length (N/m)

The decision has been made to install a wind farm with 2000MWe of generating capacity. The rest of the question gives the average wind speed (m/s) air density (kg/m^2) turbine efficiency (%) blade length (m) all of which are used to calculate the power production of the turbine, in...