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In graphite, each carbon atom is covalently bonded to three other carbon atoms. One of the four outer shell electrons of each carbon atom is therefore not engaged in bonding, and becomes delocalised. Thes...

First realize if its length is now l/3 but its volume is constant its cross sectional area is 3a. Substitute those into the equation for resistance R=p(l/a) and you get (1/9)(p(l/a))= R/9

The strong force between two nucleons is initially repulsive. However at a distance of around 1 fm the force crosses over and becomes repulsive. The strong nuclear force is only seen to act over short dis...

-First find an equation for the distance travel by car 1. In this case s=5t+50 -Next find an equation for the distance traveled by car 2. Using suvat since constant acceleration (1/2)at^2+ut=s. Substitute...

A good essay will always have a good balance between outline, evaluation and (if there's a 'stem' in the question) application. You need to make sure that you outline the theory/treatment, but that you al...