Air flows at 15C with a velocity of 12 m/s over a flat plate whose length is

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Air flows at 15°C with a velocity of 12 m/s over a flat plate whose length is 80 cm. Using one-seventh power law of the turbulent flow, what is the boundary layer thickness at the end of the plate? (The kinematic viscosity of air is 1.470 × 10–5 m2/s.)

(a) 1.54 cm 

(b) 1.89 cm 

(c) 2.16 cm

(d) 2.45 cm

(e) 2.82 cm

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