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Determine the thickness of the boundary layer formed over a flat plate submerged in water (density = 1000 kg/m³, viscosity = 0.001 Pa.s) at a velocity of 5 m/s, with a length of 1 m and a temperature of 20°C. Given that the Reynolds number for this flow is 5×10⁴, calculate the friction coefficient and the drag force acting on the plate.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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