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It means that the wave changes direction when it changes over from one medium to another. This is related to the different speeds the wave has in the different media.
A moving body can be broken into the factors of mass and velocity. Momentum is the quantity that changes as velocity increases or decreases, assuming mass is held constant.
direction
Since speed is the magnitude component of the vector quantity of velocity, of course when speed changes velocity also changes. Speed is a one dimensional scalar quantity. Velocity is a three dimensional vector quantity describing both speed and direction of motion.
The mechanical advantage changes. The proportion of needed effort in relation to the rock's weight changes.
It is a movement from one point to another point or one price quantity combination to another point on a fixed demand curve.
Directly propotional & invesly propotional
The relation is decribed by the law of Clapeyron: pV= nRT where - p is the pressure - V is the volume n is the quantity of material - R is the gas constant - T is the temperature
It's necessary to have a third element in order to make the primary figures to be changed. according to Fourth Pitagoras' Law.
variable
It changes when the market demand and or market supply changes.
It means that the wave changes direction when it changes over from one medium to another. This is related to the different speeds the wave has in the different media.
Feedback in general is the process in which changing one quantity changes a second quantity, and the change in the second quantity in turn changes the first.Positive feedback amplifies the change in the first quantity while negative feedback reduces it.....
A variable
Acceleration
the rock cycle
Cross price elasticity is a well known economic term. It's a measurement analysis of how the quantity demand of say, one particulat product changes as the price of another product or good changes. It's more or less a realtionship variable.