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Describe how volcanoes are monitored so that people can prepare for an eruption.

Volcanoes often show precursory activity before they erupt. Volcanologists can monitor this activity to forecast an eruption. This includes: - Monitoring earthquakes with seismometers. Just before an eruptio...
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Answered by E R. • Geography tutor
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Derive I = nAVe

Over 1 second, electrons with drift velocity V travel through a wire of cross sectional area A. Distance Vt (t = 1) multiplied by area A gives a volume AV. This volume multiplied by the electron density of t...
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Answered by Dojcin D. • Physics tutor
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What is 'cotx'?

cot is a short way to write 'cotangent'. This is the reciprocal of the trigonometric function 'tangent' or tan(x). Therefore, cot(x) can be simplified to 1/tan(x). Using trigonometric rules, an alternative w...
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Answered by Lucy G. • Maths tutor
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What is a phagocyte?

Phagocytes are types of cells found in the bloodstream and tissue. They are an important part of the immune system. They recognise foreign antigens on invading pathogens and engulf them. They then digest the...
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Answered by Lucy G. • Biology tutor
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What is the difference between distance and displacement?

Distance refers to how far an object has travelled in total during its motion. Displacement refers to the object's overall change in position / how far an object is now, from it's initial position.
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Answered by Lucy G. • Maths tutor
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