Standard air is drawn into a low-speed wind tunnel. A 30-mm diameter sphere is mounted on a

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Standard air is drawn into a low-speed wind tunnel. A 30-mm diameter sphere is mounted on a force balance to measure lift and drag. An oil-filled manometer is used to measure static pressure inside the tunnel; the reading is \(-40 \mathrm{~mm}\) of oil \((\mathrm{SG}=0.85)\). Calculate the freestream air speed in the tunnel, the Reynolds number of flow over the sphere, and the drag force on the sphere. Are the boundary layers on the sphere laminar or turbulent? Explain.

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