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A coal fire is burning in the bottom of a furnace, with a chimney above it. Air moves into the furnace from an opening at the bottom and up the chimney. Describe how the process of convection causes this air movement.

The air is heated by the coal fire. This causes the air to expand as the molecules move further apart. As a result the air becomes less dense. The less dense air rises. The cooler air from outside the chimne...
JB
Answered by James B. • Physics tutor
7945 Views

How did the role of women change in American society before the second world war?

When answering this A Level essay question, it is important not to analyse women as a single homogenous group. Factors such as race, socio-economic position, and family structure should be taken into account...
AH
Answered by Amelia H. • History tutor
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Solve the simultaneous equations: a) 2x + y = 18, b) x - y = 6

Notice we have two different equations but that 'x' and 'y' take the same value in both equation a and equation b. In order how to work out what values they take we need to combine the two different equation...
RC
Answered by Rebecca C. • Maths tutor
3827 Views

How does Priestly explore responsibility in An Inspector Calls?

Priestly explores the theme of social responsibility through the actions of the characters in the play. Through Sheila, the Inspector, and Mr and Mrs Birling, Priestly suggests that everyone has a collective...
RW
Answered by Rosie W. • English tutor
157069 Views

Find the coordinates of any stationary points of the curve y(x)=x^3-3x^2+3x+2

A stationary point is a point where the gradient of a curve is 0. The derivative of a curve gives us a function for the gradient at every point on the curve. So we have that dy(x)/dx=0 if and only if the cur...
RS
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