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lol do it yoursel'
It is called the momentum-impulse theorem and states that an impulse will change the momentum of an object. For example, if you drop an object when it hits the ground an impulse occurs. The momentum of the object also changes. Jnet = deltap, where deltap is the change in momentum.
It's an elasticity coefficient of demand: deltaD/deltaP When the coefficient is >1 it is an elastic demand When the coefficient is <1 it is a nonelastic demand
Heat is required to make the reaction occur.