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How can I improve my essays?

Essay writing, both in exams and otherwise, can often appear daunting at first. However, by GCSE and A Level, students should hopefully be well practised in the art, and should be comfortable with the ...

Answered by Mark T. • Classical Civilisation tutor

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A particle that moves uniformly in a circular path is accelerating yet moving at a constant speed. Explain this statement.

Acceleration is a change in velocity over time. Velocity is different to speed, because it has a direction (for example a car moving at 10 mph along a road heading north will have a greater ve...

Answered by Anna L. • Physics tutor

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A model truck A of mass 1.2 kg is travelling due west with a speed of 0.90 m/s . A second truck B of mass 4.0 kg is travelling due east towards A with a speed of 0.35 m/s .

a) Calculate the magnitude of the total momentum of the trucks.

The momentum (p) is the mass (m) of an object multiplied by its velocity (v).

p = m x v

Answered by Anna L. • Physics tutor

15833 Views

Karen got 32 out of 80 on a Maths test. She got 38% on an English test. Which test did she do better in?

32 out of 80 on a Maths test38% on an English testAs we don't know any other information about the English test (e.g. her mark and the total mark) the only way that we can compare the two...

Answered by Vicky C. • Maths tutor

12291 Views

Explain in terms of ΔG, why a reaction for which both ΔH and ΔS are positive is sometimes spontaneous and sometimes not.

For a reaction to be spontaneous delta G has to be negative according to the equation delta G = delta H - TdeltaS. Therefore if the temperature of a reaction is very high then -TdeltaS will be greater ...

Answered by Aaron C. • Chemistry tutor

16640 Views