Question 5 (of 5) value: 10.00 points 1 out of 3 attempts A wind turbine convert

Question

Question 5 (of 5) value: 10.00 points 1 out of 3 attempts A wind turbine converts some of the kinetic energy of the wind into electrical energy. SupposeA that the blades of a small wind turbine have lengthl -2.9 m. Part 1 a) When a 10 m's (22 mi/b) wind blows bead-on, what volume of air (in m') passes througb the eireular area swept out by the blades in one second? 264.21 Part 2 (b) What is the mass of this much air? Each m3 of air has a mass of 1.2 kg. 317.05 kg Part 3 out of 4 (e) What is the translational kinetic energy of this mass of air? k.J References MacBook Air 0 FI F2 F3 F4 FS F7

Explanation / Answer

a) V = A d = pi L2 * (v * t)

= pi * 2.92 * 10 * 1 = 264.21 m3

b) m = p V

= 1.2 * 264.21 = 317 kg

c) translational KE = 1/2 m v2

= 1/2 * 317 * 102= 15.85 kJ

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