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What is metallic bonding?

Atoms in a metal are arranged in a lattice formation. What is a lattice? Imagine a grid (squares on a sheet of graph paper for example) where there is a metal atom in each square of the grid. This is called ...
LT
Answered by Luke T. • Chemistry tutor
12178 Views

Explain what is meant by a semi-fixed exchange rate? With reference to the BBC news story in the link below, explain why the Nigerian central bank increased interest rates and devalued their currency (the naira)?

http://www.bbc.co.uk/news/business-30196496 An exchange rate is the price of one currency in terms of another. When this rate is semi-fixed the exchange rate is allowed to fluctuate between a specified range...
OC
Answered by Owen C. • Economics tutor
15919 Views

How do you find the cube root of z = 1 + i?

Firstly we express z in polar form: z = R e i θ where |z| = (Re 2 + Im 2 ) 0.5 = (1 2 + 1 2 ) 0.5 = 2 0.5 θ = arg z = tan -1 (Im/Re) = tan -1 (1/1) = π/4 Therefore z = (2 0.5 ) e i π/4 We can add on any mult...
AE
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How do you calculate the Earth's escape velocity?

The escape velocity is the speed that an object must have in order to have enough energy to escape the Earth's gravitational field. To calculate the escape velocity, we can apply the principle of Conservatio...
AE
Answered by Aldwyn E. • Physics tutor
26727 Views

How do I write an effective introduction for an English essay?

Planning The key to writing a good essay introduction is to plan your answer first. This is more difficult in an exam than for a coursework essay, as you have the additional pressure of limited time. As a ge...
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