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The roar of a tiger in a zoo can be heard by visitors at the entrance, even though the tiger can not be seen because there is a hill in the way. Name and explain this effect.

This effect is called diffraction. This occurs when waves spread over obstacles or through gaps.
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Answered by Matilda C. • Physics tutor
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Using answer to previous question state the coordinates of the minimum

From previous question y=2(x+2) 2 -1Minimum would be when (x+2) 2 is at it's smallest value, in this case when (x+2)=0 since any other value squared would be greater than 0. This occurs when x=-2, and y at t...
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Answered by Matilda C. • Maths tutor
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Express 2x^2 +8x +7 in the form A(x+B)^2 + C, where A, B and C are constants

2x 2 +8x+7=2(x 2 +4)+7=2((x+2) 2 -4)+7=2(x+2) 2 -8+7=2(x+2) 2 -1 A=2, B=2, C=-1
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Answered by Matilda C. • Maths tutor
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How does a pregnancy test work?

1) The wick of the pregnancy test is socked in urine. 2) The test contains mobile monoclonal antibodies with small coloured beads attached to them. 3) These mobile monoclonal antibodies only bind to hCG and ...
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Answered by Lijun Z. • Biology tutor
22501 Views

How should I respond to questions which ask me to deal with a source?

Your answer needs to deal with a few different aspects of the source while also drawing on your own knowledge to interrogate what you are reading. Firstly, you need to show that you understand what the sourc...
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Answered by Conor M. • History tutor
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