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What is the equivalence principle of General Relativity and what does it mean?

Einstein introduced the equivalence principle by saying "We ... assume the complete physical equivalence of gravitational field and a corresponding acceleration of the reference system". There are ...
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Answered by Andrew M. • Physics tutor
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Why does increasing the temperature of a gas increase the pressure (when the volume is fixed)?

We can understand this using an idea called the Kinetic Model of Gases . Basically, let's assume that every molecule in the gas is a tiny, tiny snooker ball whizzing around the container. These 'snooker ball...
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Answered by Andrew M. • Physics tutor
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Find the equation of the tangent to the curve y = 2 ln(2e - x) at the point on the curve where x = e.

The first step is to find the y coordinate at the point on the curve where x = e. To do this we subsitute x = e into the equation of the curve, so y = 2ln(2e - x) becomes y = 2ln(2e - e). Simplifying this, w...
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Answered by Rhiannon T. • Maths tutor
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Solve x^2 - 6x - 2=0 giving your answer in simplified surd form.

SInce the question requires simplified surd form, it makes sense to use the quadratic formula immediately for this question. This would give us x = 6 [+-] squareroot(36-(4x1x-2)) / 2 which simplifies to x= 6...
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Answered by Molly B. • Maths tutor
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What type of enzyme digests protein: amylase, lipase or protease?

The key to being able to answer this question is having good memory tricks in place. In this case, connecting lipase with lipid in your mind will help you recall that lipases digest fats and so that cannot b...
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Answered by Molly B. • Biology tutor
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