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A nucleus of the stable isotope Pb(208,82) has more neutrons than protons. Explain why there is this imbalance between proton and neutron numbers by referring to the forces that operate within the nucleus.

Must include 3 points from 1-5 and 1 point from 6-7 for 4 marks. 1.Strong nuclear force (SNF) affects nucleons or protons and neutrons.2. SNF attraction extends up to 3 fm (allow 1–4 fm) 3. The SNF is repuls...
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What is the total capacitance of a circuit containing a 3microfarad capacitor and a 2microfarad capacitor in series.

For capacitors in series (1/Total capacitance)=(1/capacitance1)+(1/capacitance2).1/C=[(1/(3 10^-6))+(1/(2 10^-6))]^-1Total capacitance=1.2*10^-6=1.2microfarad
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A curve has equation y = 3x^3 - 7x + 10. Point A(-1, 14) lies on this curve. Find the equation of the tangent to the curve at the point A.

Firstly, we define a tangent as a straight line touching a curve at 1 point only.We can describe a straight line using this linear relation:y - y 1 = m.(x - x 1 )We know a point on this line A(-1, 14) = (x 1...
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Answered by Joshua P. • Maths tutor
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Let p and q be different primes greater than 2. Prove that pq can be written as difference of two squares in exactly two different ways.

Without loss of generality claim p > q.Now, we try to write pq in the form pq = a 2 -b 2 where a and b are non-negative integers.If b = 0, then pq = a 2 . But p and q are different, so pq is not a square....
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Answered by Theodor L. • STEP tutor
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To what extent was the Civil Rights Movement a success?

In order to answer this question, first of all it is vital to break down what it is actually asking. This essay's main discussion should centre quite clearly around the Civil Rights Movement, however this te...
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Answered by Orla L. • History tutor
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