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1. At the end of a marathon sweat covered runners are given a shiny foil sheet to stop them cooling down too quickly. a) Suggest why the runner may cool down too quickly without the foil sheet (1) b.) Explain how the foil sheet reduces heat loss(2)

Note consider what type of heat loss is occurring1a) key word suggest Runner covered in sweat , when this evaporates it will reduce surface temperature (1)b) key word explain, remember this means it t not en...
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Answered by Lavana C. • Physics tutor
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Prove that the difference of the square of two consecutive odd numbers is always a multiple of 8. [OCR GCSE June 2017 Paper 5]

Part 1 of this question asks you to explain why 2n+1 is an odd number, so it is assumed that the student knows this already. The definition of any odd number is 2n+1. Since all consecutive odd numbers are tw...
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Answered by Jon J. • Maths tutor
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Work out the value of 27 ^-2/3

In order to answer this question we should first break it down into simpler parts. Using the law of indices we can start this process. Using the law above we can break down the components of the original que...
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Answered by Daniel W. • Maths tutor
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What is the evidence for the Big Bang theory?

Absorption spectra from distant galaxies consist of bands of coloured light crossed with black lines. The wavelengths of these black lines are shifted towards the red end of the spectrum when compared with l...
AM
Answered by Aled M. • Physics tutor
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Describe the differences in Structure and properties of diamond and graphite

Both of these compounds are made purely of carbon. The differences come in the way in which the atoms are bonded together and the properties that this creates.In diamond, each atom is covalently bonded to fo...
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Answered by Phoebe P. • Chemistry tutor
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