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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. ...

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 ...

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 ...