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How to analyse a source?

Analysing a source at first often feels like a daunting task, especially because it is unseen material, but it needn’t be! If you simply focus on what the question if asking you to do and structure it in an ...
ML
Answered by Matthew L. • History tutor
18880 Views

Two electrons are a distance r apart, the first electron exerts a force F on the second electron. a) What force does the second electron exert on the first? b) In terms of r, at what distance is the force that the first electron exerts on the second F/9?

This question is on electric forces between charged particles. A useful equation to consider is Coulomb's law: F=k(Q 1 Q 2 )/R 2 Where k is the Coulomb's law constant:k~9.0x10 9 Nm 2 /C 2 Q is the charge on ...
RW
Answered by Ross W. • Physics tutor
6951 Views

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 ...
RW
Answered by Ross W. • Physics tutor
4341 Views

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 ...
FB
Answered by Felix B. • Chemistry tutor
5161 Views

differentiate 2^x

y=2^x lny=xln2 y=e^(xln2)
MP
Answered by Mit P. • Maths tutor
6780 Views