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Explain the process of ventilation in human lungs.

Ventilation is movement of air into and out of lungs; volume of thorax/lungs/chest increased/decreased; pressure in thorax/lungs/chest decreased/increased; air flows from higher to lower pressure / air flows...
AK
Answered by Anahita K. • Biology tutor
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By using an integrating factor, solve the differential equation dy/dx + 4y/x = 6x^-3 (6 marks)

Answer : y = 3/x 2 + c/x 4 Integrating factor is 4/x (1 mark) => I = e integral (4/x) dx (1 mark) => I = x 4 (1 mark) . Using the formula, d/dx (x 4 y) = 6x (1 mark) => x 4 y = integral(6x)dx (1 mar...
MD
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A curve has the equation y=sin(x)cos(x), find the gradient of this curve when x = pi. (4 marks)

Option 1 - Differentiate using product rule giving dy/dx = cos 2 (x) - sin 2 (x). (2 marks) Subbing in x as pi (1 mark) then gives (-1) 2 + (0) 2 . Therefore the gradient is 1 (1 mark) . Option 2 - Initially...
MD
Answered by Mark D. • Maths tutor
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Iqbal Khan’s production of Othello (2015) breaks with tradition in casting both Othello and Iago as black men - in what way does this shift the emphasis of the play?

Often dubbed a 'race play', Shakespeare's 'Othello' usually pits the jealousy of a white man against the success of a Moor, illustrating the destructive consequences of racial intollerance. Khan's casting de...
MM
Answered by Michael M. • English tutor
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Explain the general trend in first ionisation energy across period 2 in the periodic table.

Across period 2, the nuclear charge increases from Li (3+) to Ne (10+) as protons are added to the nucleus. - The electros are removed from the same main energy level and electrons in the same main energy le...
EA
Answered by Eyad A. • Chemistry tutor
30730 Views