A piece of wood of mass 22.5 kg is attached to an ideal massless spring and allowed to hang in the Earth's gravitational field. The spring stretches 5.4 centimeters before it reaches its equilibrium position. If this system is next set into oscillation, what will be its frequency, in Hertz

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples