Computing average force on the ball
A 430 g football is lying on the ground, then is kicked and is moving at 25 m/s. If the duration of the impact was 0.0010 s, what was the average force on the ball?
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A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration be raised to accomplish this?
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How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
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