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What is price elasticity of demand?

Price elasticity of demand (PED) measures the responsiveness of demand in relation to a change in price. The formula for PED is %change in quantity demand / %change in price. If a good has an elastic PED it ...
AL
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How do I structure an essay question?

In history essays you need to show that you understand the question you are being asked and that you can illustrate several different interpretations, backing each with evidence. An introduction is needed to...
JO
Answered by Joshua O. • History tutor
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Show that a pendulum undergoes simple harmonic motion (SHM). State your assumptions. The pendulum is made up of a light inextensible string, attached to a ceiling at one end and with a particle of mass m attached to the other end.

Begin with a diagram of the system, and definition of directions. Vertically up and clockwise rotations are positive. It must be recalled that in SHM force is proportional to displacement from equqilibrium. ...
LK
Answered by Luke K. • Physics tutor
13104 Views

Find the derivative of f(x)= ln(|sin(x)|). Given that f(x) has a value for all x, state why the modulus is required.

The derivative can be found by using the chain rule. i.e. let g(x) = |sin(x)|, so f(x)=ln(g(x)), hence df/dx = df/dg * dg/dx df/dg = 1/g, dg/dx = |cos(x)| so df/dx = |cos(x)|/|sin(x)| For the second part, it...
LK
Answered by Luke K. • Maths tutor
12993 Views

How can texts be interpreted differently at different historical times?

In the same way the context in which a text is written influences the author's final product, the historical period in which that text is interpreted greatly shifts our perception of its themes and messages....
JH
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