The refractive index varies with wavelength of light as given by formula (known as cauchy dispersion formula ), where A and B are constant. Determine the dimension of A and B.

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.