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Assignment help 2563

A diver leaps off a 3.0 m high diving board with a speed of 3.7 m/s and at an angle of 60° above the horizontal. How fast is the diver going when she reaches the water below? (Hint: Use conservation of mechanical energy for this!)A piece of iron has a mass of 0.4 kg and is initially at 1,145 degrees C. It is lowered into a beaker with 20 L of water at 22 degrees C. What is the final equilibrium temperature? (Hint: Neglect any energy loss to the environment. This means the system is isolated. But the iron and water can still exchange energy in the form of heat; it’s just that, by the first law of thermodynamics, the total heat (Q) must be zero. Also, table 6.4 in the text has the specific heat capacities of iron and water.)

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