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What's the key to solving simultaneous equations?

With simultaneous equations, a lot of the maths GCSE qualification, the best approach is to work things out step by step and write every step you take down on your exam paper. This does seem like its time co...
DI
Answered by David I. • Maths tutor
3563 Views

Using the Keynesian AD/AS diagram, explain why an economy may be in equilibrium at any level of real output

Aggregate demand can be defined as the total demand to the output a country’s economy at a given time interval and given price level. It is calculated through the formula AD=Consumer Spending (C)+ Investment...
IS
Answered by IREM S. • Economics tutor
25428 Views

Please describe the change in velocity of someone falling from a plane before they open their parachute

At first, when the parachutist is at 0ms-1 velocity (about to fall) there is only Weight acting downwards on the person, so the resultant force is down. F=ma, therefore the parachutist accelerates downwards....
PE
Answered by Pearl E. • Physics tutor
3549 Views

How would you work out the equation of the normal at a point (2,5) given the equation of a line?

You are given the equation of a line in the form of y=mx+c. From this, you know that 'm' represents the gradient, which can also be represented as dy/dx. We now need to work out the gradient of the normal li...
RC
Answered by Rohil C. • Maths tutor
4017 Views

What is the difference between 'Electrospray Ionisation' and 'Electron Impact' during the ionisation stage in a mass spectrometer?

Mass Spectrometry is often used by scientists to determine all the isotopes present in a sample (using their isotopic masses) and thus identify the element. The first stage is called the 'ionisation stage' a...
RC
Answered by Rohil C. • Chemistry tutor
35763 Views