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Explain the trend in first ionisation energies across a period.

There is a general increase in the ionisation energy as we move across a period. This is because the the number of shielding electrons is constant and the atomic number increases, which means the effective n...
KS
Answered by Kealan S. • Chemistry tutor
3171 Views

How do I write a good introduction for an essay?

When writing an introduction it is a good idea to stick to a clear three-part structure. Let's take the following example of an essay question: How did the role of women in Britain change during World War II...
AM
Answered by Ana Maria M. • History tutor
2999 Views

Two cables hold a mass of 100kg, joining in the middle of the top of the mass. Two helicopters lift a cable each and hover so that the height of the mass is constant. Each cable makes an angle of 57° with the normal. Find the tension in each cable.

Once you note that the height is constant, the key thing to remember here is that there is no unbalanced force acting on the mass. By this, I mean that since the mass is not accelerating (it is actually at r...
JK
Answered by Joseph K. • Physics tutor
2855 Views

"I always feel that I am arguing the same point. How can I make my essays stand out more?"

My recommendation would be to broaden your net. Do not restrict yourself to the traditional readings of "Shakespeare" or "Jane Austen". There are hundreds of academic essays written on th...
JB
3153 Views

The equation " x^3-3x+1=0 " has three real roots. Show that one of the roots lies between −2 and −1

A simple way to prove this is to sub in the values that we are given. so f(x) will represent our equation x^3-3x+1 (that is f(x) = x^3-3x+1)f(-2) = -1 < 0f(-1) = 3 > 0The first thing we notice is that ...
JB
Answered by James B. • Maths tutor
10578 Views