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What are catalysts? They are substances that speed up the rate of reaction by providing a favourable pathway, of lower activation energy, for the reaction to proceed. A heterogeneous catalyst is one that ...

Mark-recapture is a method of estimating a population size. A sample from the population is captured using an appropriate method, marked, and released. A second sample is then captured after an interval a...

We first consider 1/z=(cosx+isinx)^(-1). Application of De Moivre's theorem for integer n: (cosx+isinx)^(n)=cosnx+isinnx yields the result 1/z=cosx-isinx. Addition of the two forms z and z^(-1) steers us ...

Using F = Gm₁m₂/r^2 and substituting in the values, we get F = 3.57*10^22N.

 Most criminal offences can be broken up into two parts that need to be satisfied in order for somebody to be convicted of the offence. These are the Actus Reus and Mens Rea.  The Actus Reus can be though...