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Why are certain fields chosen to be the primary key in a database?

A Primary key is a field in a database that is used as an unique identifier for each record. Therefore the field that is chosen as the primary key has to be something that will be different for every record,...
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Answered by Corey B. • Computing tutor
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What can the nucleus emit during radioactive decay?

There are three possible emissions from a nucleus decaying radioactively. The first is the emission of an alpha particle. Alpha particles consist of neutrons and protons. Secondly a beta particle can be rele...
SK
Answered by Samuel K. • Physics tutor
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Give Hobbes' three psychological arguments for the state of war

Hobbes argues that in a ‘state of nature’, individuals are not subject to a common higher authority; instead they are free to follow their desires and act upon their own private judgement. We all have a natu...
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Answered by Asher K. • Politics tutor
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Outline the structure of the alpha and beta particle and give their overall charge and a material which it cannot pass through.

Alpha - it is composed of 2 protons and 2 neutrons. It has an identical structure to a helium nucleus (an atom with no orbiting electrons). It has an over charge of +2. It cannot pass though a sheet of paper...
LM
Answered by Liam M. • Physics tutor
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Which unit is equivalent to J kg^-1? a) m s^-1 b) m s^-2 c) m^2 s^-1 d) m^2 s^-2

When working out unit equivalences the most straightforward approach is to use formulas (often in the data booklet) to help reach a correct answer. We start by looking at Joules; knowing a Joule is a unit of...
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Answered by Samuel K. • Physics tutor
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