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When is a system in equilibrium?

A system is in equilibrium when there is no resultant force and no resultant torque (or moment). A moment is the turning effect of applying a force on a body. It is the product of the force and the perpendic...
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Answered by Razvan T. • Physics tutor
3974 Views

How can I sketch a graph?

There are a number of steps before sketching a graph. We will look over bits of theory and then do some examples (I'll show the examples in the online lesson space) First we have to find the x-intercept and ...
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Answered by Razvan T. • Maths tutor
3801 Views

How should I prepare for an oral exam?

I would advise any student to prepare for an oral exam in 3 main ways. Firstly, the student should get to grips with the factual content of their area of study. This will allow the to gain a general understa...
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Answered by Sam P. • French tutor
2311 Views

How can urine be used to detect pregnancy?

The hormone Human Chorionic Gonadotrophin (HCG) starts to be secreted six days after conception from a developing embryo. A pregnancy test stick has three bands. In the first are monoclonal antibodies which ...
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Answered by Aimee W. • Biology tutor
4779 Views

How successful was the emancipation of the serfs in Russia under Alexander II?

In spite of of the Tsar’s reformist intentions, the emancipation of the serfs starting in 1861 produced largely negative effects. Intended to improve the social conditions of peasants and to spur an improvem...
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Answered by Sam P. • History tutor
36299 Views