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A rollercoaster carriage of mass 100kg has 45kJ of Kinetic Energy at the lowest point of its ride. Ignoring air resistance and friction between the wheels and the tracks, what is the maximum height above this point it could reach? [Take g as 10m/s/s)

[A useful tip: always start by drawing a diagram!!]This question is asking you to apply conservation of energy, i.e. at the highest point it can reach above the lowest point, all of this Kinetic Energy will ...
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Answered by Ross W. • Physics tutor
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What is a buffer and what do you need to make one?

A buffer is a solution which resists changes in pH when alkaline or acidic solution is added to it. Buffers are created based on the equilibrium of a proton donor/ acceptor and the conjugate base/ acid. For ...
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Answered by Felix B. • Chemistry tutor
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differentiate 2^x

y=2^x lny=xln2 y=e^(xln2)
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Answered by Mit P. • Maths tutor
6831 Views

How do I differentiate between masculine and female nouns?

It is often difficult to tell if a French noun is feminine or masculine. There are some tricks to knowing the difference though. Feminine nouns usually end in 'e' or 'ion' whereas for masculine nouns it's 'a...
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Answered by India S. • French tutor
4604 Views

How do I prepare for a speaking exam?

When you are preparing for a speaking exam it is beneficial to revise the subject area beforehand. Talk to your teacher/tutor and find out which topic/s you will be discussing. You could meet up with a frien...
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Answered by India S. • German tutor
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