Barker's equation is used to describe one phenomenon that occurs in this shape, and a rotatingfluid in a container takes on this shape. In quantum mechanics, a potential of this shape gives rise towavefunctions that are the product of a Gaussian function and a Hermite polynomial. In celestialmechanics, an object moving in this shape has velocity square root of two G M over r, and captureorbits and escape orbits have this shape. A charge moving straight when entering a uniform electric(*) field will travel in this shape. Lenses in this shape so no spherical aberration, since they focus allparallel rays at a point. For 10 points, name this shape, which is also traced out by a projectile fired 
Barker's equation is used to describe one phenomenon that occurs in this shape, and a rotatingfluid in a container takes on this shape. In quantum mechanics, a potential of this shape gives rise towavefunctions that are the product of a Gaussian function and a Hermite polynomial. In celestialmechanics, an object moving in this shape has velocity square root of two G M over r, and captureorbits and escape orbits have this shape. A charge moving straight when entering a uniform electric(*) field will travel in this shape. Lenses in this shape so no spherical aberration, since they focus allparallel rays at a point. For 10 points, name this shape, which is also traced out by a projectile fired into theair at an angle with no air resistance.
Barker's equation is used to describe one phenomenon that occurs in this shape, and a rotatingfluid in a container takes on this shape.
parabolic [or parabola or paraboloid]