Home » Maths for Planet Earth » City Emission Levels

City Emission Levels


The emissions of a city from 2000 to 2012 are modelled by the equation

\(p\left( t \right) = \frac{1}{10}\ln\left( t + 1 \right) – \cos\frac{t}{2} + \frac{1}{10}t^{\frac{3}{2}} + 199.3\)

\[0 \leq t \leq 12\]

a) Show that the emissions reach a local maximum in the interval \(8.5 \leq t \leq 8.6\)

[5 marks]

The emissions reach a local minimum between 9 and 11 years after the measurements began.

b) Using the Newton-Raphson procedure once and taking \(t_{0} = 9.9\) as a first approximation, find a second approximation of when the emissions reach a local minimum.

[6 marks]

Start exploring

Latest from blog

More Maths for Planet Earth

This graph, from the IPCC 1.5°C report, shows how the rate of carbon dioxide emissions varies with time in two scenarios in which global
Climate change affects the habitats and environments of many species, some of which won’t be able to adapt fast enough to survive in their
A Level
You are given the equation [fleft( x right) = 5costheta – 8sintheta] a) Express f(x) in the form (Rcos{(theta + alpha})) where (R >
A Level
a) Use the substitution (u = 4 – sqrt{s}) to show that [int_{}^{}frac{text{dh}}{4 – sqrt{s}} = – 8lnleft| 4 – sqrt{s} right| – 2sqrt{s}