What is the electric force between a glass ball that has +2.5 x 10^-6 c of charge and a rubber ball that has -5.0 x 10^-6 c of charge when they are separated by a distance of 0.0050 m?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.