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A.C. stands for alternating current, and the current constantly changes direction. D.C. stands for direct current, and the current only flows in one direction.

Use the equation p= m x v , where p=momentum m=mass (kg) and v=velocity (m/s)p= 84x5 = 420 kg m/s

Waves are a way that energy is transferred from one place to another. There are two main types of wave, Transverse and Longitudinal. In both types of wave, energy is transferred in one di...

Work done (joules) = Force (newtons) x distance moved in direction of the force (metres)

Work done = 10 x 2 = 20J

All that is meant by an 'excited' atom is that one or more of the atoms electrons in it's shells, are then excited into shells that are in higher energy states that they were in before.

F...