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1 - parachutist is in plane, they are stationary so according to Newton's first law the forces acting on them (weight downwards and reactionary force upwards) are equal. 2 - parachutist leaves the plane. Hav...

The gaps within an absorption spectrum occur when the light that is measured has passed through a medium that has absorbed some photons. The photons that the medium absorbs are specific to the element that t...

Transformers are two coils of wire, coiled around each side of an iron core (primary and secondary). The primary coil has a potential difference supplied to it that drives the alternating current through the...

The experiment involved firing alpha particles at thin gold foil, where the number of alpha particles scattered at various angles were counted using a detector. This provided evidence for the existence, char...

In a system, we can transfer energy from an energy store into one or more useful forms of energy, however this process is not 100% efficient and some energy is wasted as heat or sound - this is known as diss...