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How does blood circulate through the heart?

De-oxygenated blood in the body returns to the right atrium of the heart through the superior and inferior vena cava. This blood is pumped through to the right ventricle , the tricuspid valves prevent any ba...
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Answered by Clarisse B. • Science tutor
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I do not understand how demand and supply work, can you please explain it to me?

Economics is the social science that studies the production, distribution and the consumption of goods and services. To explain this concept, we use the model of demand and supply, which is shown in a graph....
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Answered by Anya M. • Economics tutor
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Use integration by parts to integrate ∫ xlnx dx

∫ u(dv/dx) dx = uv − ∫ v(du /dx)dx is the Integration by Parts formula. If you set u=lnx, differentiation (rememeber from tables) leads to du/dx= 1/x, and dv/dx=x and so v=x^2/2 (raise power by one then divi...
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Answered by Minty M. • Maths tutor
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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
3085 Views

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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