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A gun of mass 10kg fires a bullet of mass 240g at a speed of 300ms-1. What is the speed of the gun's recoil?

First, convert the mass of the bullet into SI units -> 240g=0.24kg The law of the conservation of momentum states that m 1 v 1 =m 2 v 2 . To find the speed of the gun, rearrange for v 1 to give v 1 =m 2 v...
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Answered by Jonny F. • Physics tutor
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How does anti-biotic resistance occur?

Anti-biotic resistance is a growing problem for humans now, exacerbated by the overuse and over reliance on anti-biotics. Bacteria colonies have genetic variation amongst the individuals which means they rea...
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A circle with centre C(2, 3) passes through the point A(-4,-5). (a) Find the equation of the circle in the form (x-a)^2 + (y-b)^2=k

This question is aimed at A-Level Pure Core 1 students. A circle with centre C(2, 3) passes through the point A(-4,-5). Find the equation of the circle in the form (x-a)^2 + (y-b)^2 = k From the formula for ...
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Answered by Tilly C. • Maths tutor
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What is meant by ‘determinism’ and what are the different types I need to know for the AQA paper 3 exam?

Determinism refers to the understanding that all human behaviour is controlled and has an identifiable cause. It is the opposite to ‘free will’ which refers to individuals having active control over their ow...
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Answered by Jodie F. • Psychology tutor
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Prove by induction the sum of the natural numbers from 1 to n is n(n+1)/2

Need whiteboard throughout to properly answer, so will go through the ideas of what to do: Take the base case of when n=1, and show that (sum from 1 to 1) j = n(n+1)/2 is equal to 1. Take the assumption that...
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