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What is diffusion and why is it important in both animals and plants?

Diffusion is a passive process involving the movement of molecules from a region of a higher concentration to one of a lower concentration (the term passive means that the process does...

Answered by Mathew C. • Biology tutor

184363 Views

What is an (electrostatically) induced charge?

When an electrically charged object (e.g rod) charges an uncharged object (e.g. metal sphere) that is nearby with the opposite charge.

How does this happen?

Answered by Herminia T. • Physics tutor

22540 Views

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 ...

Answered by Matthew L. • History tutor

18662 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(Q₁Q₂

Answered by Ross W. • Physics tutor

6809 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 wi...

Answered by Ross W. • Physics tutor

4179 Views