:The device depends on the balls behaving as perfectly rigid objects undergoing a perfectly elastic collision ( or as near as you can get in the real world ).
22.
The molecules of a gas or liquid rarely experience perfectly elastic collisions because kinetic energy is exchanged between the molecules'translational motion and their internal degrees of freedom with each collision.
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The law can also be derived theoretically based on the presumed existence of atoms and molecules and assumptions about motion and perfectly elastic collisions ( see kinetic theory of gases ).
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Perfect competition is the only market form in which price discrimination would be impossible ( a perfectly competitive company has a perfectly elastic demand curve and has zero market power ).
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In continuum mechanics, elastic "'shakedown "'behavior is one in which plastic deformation takes place during running in, while due to residual stresses or strain hardening the steady state is perfectly elastic.
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On the other hand, a competitive firm by definition faces a perfectly elastic demand, hence it believes \ eta = 0 which means that it sets price equal to marginal cost.
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In a one-dimensional collision, the two key principles are : conservation of energy ( conservation of kinetic energy if the collision is perfectly elastic ) and conservation of ( linear ) momentum.
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But a problem arose for the NRL researchers because naval materials, e . g ., ship-plate steel, are not perfectly elastic but undergo significant plastic deformation at the tip of a crack.
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In the " ant on a rubber rope model " one imagines an ant ( idealized as pointlike ) crawling at a constant speed on a perfectly elastic rope which is constantly stretching.
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The theory was not immediately accepted, in part because conservation of energy had not yet been established, and it was not obvious to physicists how the collisions between molecules could be perfectly elastic.
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