Van Allen Belts
Two ring-shaped regions that
girdle the Earth's equator in which electrically charged
particles are trapped by the Earth's magnetic field. See South
Atlantic Anomaly or radiation belts.
In a solid, the range of energies
of electrons that are bound to atoms.
Quantity having both magnitude
(size) and direction.
Process of finding the effective
value of a component in a given direction.
Ratio of change in position to
time interval over which change takes place.
Plot of velocity of object as a
function of time.
Point from which light rays
appear to diverge without actually doing so.
Fluid that creates force that
opposes motion of objects through it. The force is proportional
to object’s speed.
Liquid that is easily vaporized.