Two versions of this quantity are equal if the dispersion relation is linear. Adding two examples ofthis quantity and dividing by one plus the product of normalized forms of this quantity is thisquantity's namesake "addition formula." The hyperbolic arctangent of this quantity divided by aconstant is additive in special relativity and is symbolized phi. One version of this quantity is given bythe angular frequency divided by the wavenumber. The curl of the vector field o
Two versions of this quantity are equal if the dispersion relation is linear. Adding two examples ofthis quantity and dividing by one plus the product of normalized forms of this quantity is thisquantity's namesake "addition formula." The hyperbolic arctangent of this quantity divided by aconstant is additive in special relativity and is symbolized phi. One version of this quantity is given bythe angular frequency divided by the wavenumber. The curl of the vector field of this quantity for afluid gives the (*) vorticity. The dot product of this quantity with the force gives the power, and thederivative of this quantity is the acceleration. For 10 points, give this vector quantity which measures thechange in position per unit time.
Two versions of this quantity are equal if the dispersion relation is linear.
velocity [prompt on "v", prompt on "speed"]