A 12 volt battery is hooked up to a 3 ohm resistor. What is the current through the resistor?

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

What happens when a rubber rod is rubbed with a piece of fur?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?