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Explain why a transformer is used in electrical power lines.

Power stations use step-down transformers to decrease the voltage of the electrical output. The power lines have a constant resistance (say, R Ohms) which means there is a power loss across the lines given b...
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Answered by Zubair M. • Physics tutor
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Explain why the pressure exerted by a gas increases as they are heated at constant volume, with references to the kinetic theory of gases.

The kinetic theory models gas particles as points moving around with a given velocity. Heating the particles causes the transfer of heat energy, which is then used to increase the particles kinetic energy. T...
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Answered by Zubair M. • Physics tutor
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How would you test for the presence of a non-reducing sugar?

We can check for the presence of non-reducing sugars the Benedick's Test. If a reducing sugar is present in a solution, adding Benedick's reagent and heating will form an insoluble red precipitate. Non-reduc...
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Answered by Jess O. • Biology tutor
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What should I be doing now to best enhance my medical school application?

Being a doctor is a difficult job and requires more skills than just being good at biology. Medical schools are looking to see if you have these skills and that you understand what you're getting yourself in...
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For y = 7x - x^3, find the two stationary points and what type of stationary points they are.

Differentiate y to get: dy/dx = 7-3x^2 , dy/dx = 0 , therefore x=(+/-)sqrt(7/3) d^2y/dx^2 = 6x , substitute x values in to y=7x-x^3 and d^2y/dx^2 to find coordinates and the type of the stationary point.
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Answered by Robbie S. • Maths tutor
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