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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 ...
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Answered by Ross W. • Physics tutor
4523 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
4712 Views

(2x + 3y)^2 – (2x – 3y)^2 = 360 show that xy is a multiple of 5

Expand first brackets: 4x 2 +6xy+6xy+9y 2 Expand second brackets: 4xy 2 -6xy-6xy+9y 2 Subtract the second expansion from the first one, being careful of the double negative: =24xy Then, back into the origina...
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Answered by Ryan M. • Maths tutor
10453 Views

Where is DNA found in a human cell? What is a gene?

DNA is a long molecule found in the nucleus (or more specifically the nucleolus) of a human cell. When it is condensed and shortened it appears, under a microscope, as 23 pairs of chromosomes. A gene is a lo...
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Answered by Ryan M. • Biology tutor
19004 Views

How do I analyse a text to A or A* level?

The examiners are looking for two things from your analysis of a text. Firstly, they want to know that you can identify literary techniques when they are used by the author. Literary techniques dont have to ...
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Answered by Ramganesh L. • English tutor
6850 Views