### Give the initial temperature of the hot horseshoe

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Q. A hot iron horseshoe (mass=0.45 kg), just forged is dropped into 1.64 L of water in a 0.35-kg iron pot initially at 20 degree celsius. If the final equilibrium temperature is 24.0 degree cesius, estimate the initial temperature of the hot horseshoe.

Q. An airplane has a mass of 2.6 x10^6 kg, and the air flows past the lower surface of the wings at 95 m/s. If the wings have a surface area of 1200 m2, how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Consider only the Bernoulli effect.

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