Charge q1 = -7.5 nC is located at the coordinate system origin, while charge q2 = -1.92 nC is located at (a, 0), where a = 1.3 m. The point P has coordinates (a, b), where b = 0.95 m. A third charge q3 = 13.5 nC will be placed later.

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.

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

This is the number of complete movements of a wave per second.