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Outline the main differences between an artery and a vein? (6 marks)

An artery carries blood away from the heart. The blood is oxygenated with the exception of the pulmonary and umbilical artery. The vessel must cope with high pressure demands and therefore has thick, elastic...
KB
Answered by Katy B. • Biology tutor
3383 Views

Given the parametric equations x = lnt+t and y = sint calculate d^2y/dx^2

First we can write d 2 y/dx 2 as (d/dx)(dy/dx). Now we need to find dy/dx. This can be further written as (dy/dt)(dt/dx). These derivatives can be obtained from the given parametric equations: dx/dt = 1/t + ...
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Answered by Agnieszka R. • Maths tutor
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Outline two limitations of Zimbardo's study into conformity to social roles. [4 marks]

This study suffers from a lack of ethical consideration - Zimbardo's participants failed to leave the study in the same way they entered. Furthermore, they were exposed to intense mental harm, shown as one p...
EK
Answered by Emile K. • Psychology tutor
14218 Views

‘The rebellion of 1173-4 was caused by the Henry II’s treatment of his sons.’ Assess the validity of this view.

Between 1173 and 1174, a series of revolts commonly referred to as the Great Rebellion occurred across Henry II’s ‘empire’: Muhlberger illustrates that he faced “nearly simultaneous invasions in Northumbria ...
KR
Answered by Kate R. • History tutor
18447 Views

How do you split a fraction into partial fractions?

In the exam you will be given a fraction with polynomial numerator and denominator, the denominator will either be factored or factorable. Firstly, you need to factorize the denominator. Then to write as par...
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Answered by Cameron W. • Maths tutor
12156 Views