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A geostationary orbit is one that appears in the same location as seen from an observer on earth. This requires three criteria; It's orbital period must be 24 hours The orbit must be above the equator at...

Electromagnetic waves can be imagined by a sinusoidal wave moving up and down, with this movement perpendicular to the direction that they are travelling in. Imagine a sea wave, it moves up and down but a...

We first need to look at why fusion of hydrogen nuclei results in a lower energy state. On the face of it, hydrogen nuclei are just protons, which all carry an equal positive electric charge. This means t...

Begin by drawing a diagram with all the vectors that act on the box. This should include the normal vector (N), the weight of the box (G), and the static friction force (F_s). Write down the equ...

At first, when the parachutist is at 0ms-1 velocity (about to fall) there is only Weight acting downwards on the person, so the resultant force is down. F=ma, therefore the parachutist accelerates downwar...