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What was the key cause of the First World War?

Many factors caused the outbreak of the First World War in the summer 1914, such that historians cannot agree on a single prime cause. Despite this, the key factors can be identified as the long-term creatio...
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Answered by David J. • History tutor
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An alpha particle is accelerated with 5MeV of kinetic energy towards the nucleus of a gold atom with atomic number 79. What is the distance of closest approach that is reached by the alpha particle?

45 femtometers to two significant figures
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Answered by Joshua M. • Physics tutor
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Find the tangent to the curve y = x^2 + 3x + 2 that passes through the point (-1,0), sketch the curve and the tangent.

Differentiate to find dy/dx = 3x + 2;at point (-1,0) dy/dx = -1substitute in to y = mx + c, noting m = -1 and the line passes through (-1,0) yields c = -1y = -x - 1, simple to sketch this line.curve sketchin...
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Answered by Peter W. • Maths tutor
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"Poetry should transform a sense of loss into something positive." Discuss how far Duffy and Larkin's poetry agrees with this statement.

Introduction:Larkin and Duffy are often described as "gloomy poets" incapable of transforming a sense of loss into something positive. 'Talking in Bed' and 'Mean Time' explore the concept of loss t...
PG
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How do I find roots of a quadratic equation when I can't factorise?

When factorising isn't working, we can try using the quadratic formula. First, we need our quadratic equation and find a,b and c - the coefficients of x and the constant. Now, we can write out the quadratic ...
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Answered by Freya D. • Maths tutor
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