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The TSA essay can be very off-putting - unlike normal exams, you can't revise lots of facts and the chances are the questions are not going to match what you've been studying for A levels/IB. But Oxford p...

The primary equation in this calculation is rho = RA/L Where rho is resistivity, A is cross sectional area, L is length, and R is resistance

The resistance and length are given in the question. Res...

You should not be put off by the algebraic letters used, substituting x's for z's is absolutely fine. For the first part of the question, since the equation involves the product of two terms, there are tw...

Referendums are a form of direct democracy that are currently advisory in the UK - the government can therefore choose to ignore the majority outcome. In terms of enhancing democracy, there are several li...

Balancing the centripetal force mv^2/r with the force experienced due to motion in a magnetic field qvB: m = qBr/v = qBC/2piv (C circumference). Putting in numbers: m = 1.83e-23 kg (~11,000 mass of proton...