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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
7059 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
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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
5288 Views

differentiate 2^x

y=2^x lny=xln2 y=e^(xln2)
MP
Answered by Mit P. • Maths tutor
6899 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
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