Find total entropy change of horseshoe-plus-water system
A 0.80 kg iron horseshoe is taken from a furnace at 870°C and dropped into 3.00 kg of water at 15.0°C. Assuming that no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.
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A 535 g ball swings in a vertical circle at the end of a 1.4 m-long string. When the ball is at the bottom of the circle, the tension in the string is 22 N. What is the speed of the ball at that point?
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Assuming that no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.
A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.60 rev/s while rotating through three-fourths of a revolution. How much time does this maneuver take?
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Lead pellets, each of mass 1.20 g, are heated to 200°C. How many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container.
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