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What is a mole?

A mole is a unit of measurement for the amount of a substance. One mole is 6.02 x 10^23 particles in a substance, known as Avogadro's constant. This is because this is the number of atoms in 12g of Carbon- 1...
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Answered by Liam M. • Chemistry tutor
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A curve has equation y = 2x^5 + 5x^4 1 . (a) Find: (i) dy/ dx [2 marks] (ii) d^2y/ dx^2 (b) The point on the curve where x ¼ 1 is P. (i) Determine whether y is increasing or decreasing at P, giving a reason for your answer.

a.) dy/dx+10x^4+20x^3 d^2y/dx^2=40x^3+60x^2 b.)sub in x=-1 to dy/dx=10(-1)^4+20(-1)^3 =-10 therefore, decreasing
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Answered by Alexandra F. • Maths tutor
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How are X-Rays produced?

X-Rays are a form of electromagnetic radiation similar to gamma radiation except X-Rays are produced when an electron is slowed down from a high velocity and gamma waves are produced from radioactive materia...
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Answered by Lewis S. • Physics tutor
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Please see below.

A pilot is capable of flying a plane with mass 6500kg, in a horizontal circle of radius r, at a constant speed of 75m/s. This is achieved by flying the jet with its wings at 35° to the horizontal. Calculate ...
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Answered by Lewis S. • Physics tutor
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Proteins are an important part of a healthy diet because they provide essential amino acids. (a) State what is meant by an essential amino acid.

There are 20 amino acids, and they can be classified as essential or non-essential – if they are non-essential they can be synthesised by the human body by itself, with no need to supplement them in the diet...
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Answered by Darragh C. • Chemistry tutor
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