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In terms of particles, explain how resistance arises in metal conductors and why does this resistance increases with temperature.

Resistance is due to the collision of free electrons with the metal ions of the conductor. When the temperture increases, the metal ions have more energy and vibrate. This increases the frequency of collisio...
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Answered by Rhys R. • Physics tutor
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The polynomial f(x) is define by f(x) = 3x^3 + 2x^2 - 8x + 4. Evaluate f(2).

f(x) = 3x^3 + 2x^2 - 8x + 4 f(2) = 3(2)^3 + 2(2)^2 - 8(2) + 4 f(2) = 3(8) + 2(4) - 8(2) + 4 f(2) = 24 + 8 - 16 +4 f(2) = 20
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Answered by Sophie W. • Maths tutor
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What is the difference between vertical and horizontal transmission of antibiotic resistance between bacteria?

Vertical transmission occurs during asexual reproduction. During the cell cycle, a bacterium will replicate its DNA (found in the form of a circular plasmid) which will contain the gene for antibiotic resist...
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Answered by Annabelle A. • Biology tutor
17386 Views

If y = 2/3 x^3 + x^2; a) What is dy/dx? b) Where are the turning points? c) What are the nature of the turning points?

a) By simple parametric differentiation of each term, dy/dx = 2x^2 + 2x b) The condition for a turning point is the gradient (dy/dx) at that point is zero. 0 = x(2x + 2) so either x=0 or 2x+2=0. Therefore th...
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Answered by Annabel F. • Maths tutor
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Why did Tsar Nicholas II abdicate from the Russian throne?

Tsar Nicholas II's abdication came against a backdrop of a changing political, social and religious nation but the catalyst for change came through Russia's struggles in the First World War. Nicholas was cho...
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Answered by James C. • History tutor
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