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Describe the ways energy can be transmitted through a substance?

Conduction, where particles within a conductor gain energy as they heat up and vibrate more vigorously passing energy onto adjacent particles as they collide. Convection, which only occurs in fluids, as flui...
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Answered by Alex L. • Physics tutor
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Emily bought 3 books and 2 apples, and she spent £19, while her brother, John, spent £15 on 1 book and 5 apples. What is the cost of one book and one apple?

First we assign, for example, that x = cost of 1 book, and y = cost of 1 apple. Then we make these into simultaneous equations, such as: 3x+2y=19 (eqn. 1) and x+5y=15 (eqn. 2). Now multiply eqn. 2 to get a c...
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Answered by Laura U. • Maths tutor
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How should I plan an essay in an exam?

Taking 5 minutes to write a plan gives you the best possible chance of writing a good essay. It may seem tempting to go straight into writing given the time pressure but this does more harm than good, as you...
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Answered by Gemma H. • English tutor
2323 Views

Explain which drama techniques you used in your piece and why.

We chose to use a technique called Verbatim during several sections of our final piece. Verbatim is a technique which utilises quotes from real life stories or documented events to increase the believability...
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Answered by Monica Y. • Drama tutor
2261 Views

Let f ( x ) = 15 /x and g ( x ) = 2 x − 5 Find fg(4), gf(-30) and give the expression for gf(x)

Key here is the order of operation.g(4) =2x4 - 5=8-5=3fg(4) = f(3)=15/3=5gf(-30)f(-30)=15/-30=-1/2gf(-30)=g(-1/2)=2x-1/2 -5=-1-5=-6gf(x)f(x)=15/xg(15/x)=2*15/x -5=30/x -5
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Answered by Eddie M. • Maths tutor
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