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Outline one study that has investigated stress-related illness and the immune system. In your answer you should refer to what was done and what was found. (4 marks)

One study which investigated into the relationship between stress-related illness and the immune system was carried out by Kiecolt-Glaser et al (1984). They used medical students to look into whether short t...
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Answered by Tina S. • Psychology tutor
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A ball is projected at an angle b from the horizontal. With initial velocity V the ball leaves the ground at point O and hits the ground at point A. If Vcos(b) = 6u and Vsin(b) = 2.5u, how long does the ball take to travel between O and A.

This is a classic 2-D projectile question. The best way to solve this problem is to split the velocity into its x and y components. In the x-direction a projectile has no forces acting on it (as we neglect a...
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Answered by Tristan C. • Maths tutor
8793 Views

What is an isotope?

Each element has a unique number of protons. For example, every carbon atom contains 12 protons. The number of neutrons can differ for each "form" of the same element - this is known as an isotope....
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Answered by Joanna G. • Chemistry tutor
4701 Views

Find the volume of revolution when the area B is rotated 2 pi radians about the x axis

First must recall the formula, of pi multiplied by the integral of y 2 After this, the correct integration should be applied, using an appropriate method that the student has learnt The correct limits used i...
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Answered by Louis S. • Maths tutor
9930 Views

How best to answer a question on how negative externalities lead to market failure.

When answering a question of this kind I like to use te acronym NOPOWA to ensure I hit all the key points. It is always good to draw the graph showing the negative externality to help illustrate your answer ...
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Answered by Erin T. • Economics tutor
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