373 Hw1 crib

373 Hw1 crib - CHM 373 Understanding Physical Chemistry...

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CHM 373 Understanding Physical Chemistry Homework #1 Solutions Page 1 of 5 1 . a) b) c) The total energy, E is the sum of kinetic, K and potential, V energies. Unless the ball is thrown straight up, there is some minimum value of K>0, because the baseball will still be moving at the top of its trajectory, which is also where V reaches its maximum value. The total energy is conserved if there is no friction, and equivalent to the initial value of K (because we may assume that the baseball has zero potential energy when it is at ground level). In the absence of friction, the final kinetic energy is exactly equal to its initial value, and the total energy is constant. The situation is expected to be quite different when the effects of friction are included, as described below. d) When a baseball is hit into the air it experiences wind resistance, which slows it down and gradually drains its total energy. As a result, the ball will not travel as far, or fly as high, as it would have if there were no wind resistance. The total energy of the baseball is the sum of its
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This note was uploaded on 01/17/2011 for the course CHM 373 taught by Professor Ben-amotz during the Fall '10 term at Purdue.

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373 Hw1 crib - CHM 373 Understanding Physical Chemistry...

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