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Based on Newton's 3 laws of motion why is linear momentum always conserved?

This is a common IB question- fairly tricky the first time you com across it!
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Answered by Simon T. • Physics tutor
3010 Views

Alternating current produced by the generator in a nuclear power plant is supplied to the primary coil of a transformer. Explain, with reference to Faraday's law of electromagnetic induction, how a current arises in the secondary coil.

A typical transformer consists of an iron core with two coils wound around it - the primary and the secondary. Any current-carrying wire produces a magnetic field around it, but because the primary coil carr...
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Answered by Jakub K. • Physics tutor
8330 Views

What is nuclear fusion?

When two atomic nuclei are heated to a very high temperature and high pressure, for example inside a star, their nuclei can join to make a larger nucleus. Energy is released when this fusion takes place and ...
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Answered by Katherine R. • Physics tutor
4497 Views

How do I work out the efficiency of a process from a Sankey diagram?

The formula for efficiency is: efficiency = (useful energy / total energy) Therefore, first we must find the total energy which is the sum of all of the branches of the Sankey diagram. So take the energy spe...
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Answered by Katherine R. • Physics tutor
25861 Views

How do we know about the structure of the atom?

Scientists originally thought that atoms were like a 'plum pudding' in that they were a sphere of positive charge with negatively charged electrons scattered about inside it. This was because they observed f...
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Answered by Katherine R. • Physics tutor
3940 Views