If the wind velocity at a height of 2 m above ground is 5.0 kmph, its value at a height of 9 m above ground can be expected to be in km/h about Hide answer choices a B) 9 C) 2.3 D) 10.6
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- Determine the wind speed at a height of 40 m over surface terrain with a few trees, if thewind speed at a height of 10 m is known to be 5 m/s. For your estimate use two differentwind speed estimation methods. Use surface roughness length, Z 0 = 100mm.Two environmental temperature gradients dT/dz of (a) - 0.008°F/ft and (b) 0.004 °F/ft exist at daytime and nighttime respectively at a given rural locale. Estimate the ratio of wind speed at 400 to 5ft for the two conditions. Note both are at stability category E with rural exponent ρ = 0.35A two-dimensional converging duct is being designed for a high-speed wind tunnel. The bottom wall of the duct is to be flat and horizontal, and the top wall is to be curved in such a way that the axial wind speed u increases approximately linearly from u1 = 100 m/s at section (1) to u2 = 300 m/s at section 2. Meanwhile, the air density ? is to decrease approximately linearly from ?1 = 1.2 kg/m3 at section (1) to ?2 = 0.85 kg/m3 at section (2). The converging duct is 2.0 m long and is 2.0 m high at section (1). (a) Predict the y-component of velocity, ?(x, y), in the duct. (b) Plot the approximate shape of the duct, ignoring friction on the walls. (c) How high should the duct be at section (2), the exit of the duct?
- A wind turbine with an extraction ratio (torque power/drag power) of 1.05 rotates at 0.53 rad/s in a wind with velocity 16m/s. The disc area is 345 sq m and the torque generated is 814 kNm. Taking air density as 1.20 kg/m/m/m, calculate the advance angle at the blade tip, assuming flow arrives at the disc axially. Express your answer in degrees.A body is thrown vertically upward with vo= 20 m/s. Find the velocity after 1.5 sec.Determine the drag on a paddle with an area of 0.06 sq.m. moving horizontally at 0.8 m/s. CD = 0.45.
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