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Let's begin with the definition of stress:

Stress = F/A

First, we need to recall that the force the weight of the crate will exert on the cable will be equal to:

F= m*g

We know...

This is an example of a 5 marker in the second part of new spec edexcel paper 1

1 mark for defining supply and demand

1 mark for applying it to context (text provided in the exam) 

3 ...

Define tropical storm: A large, low-pressure system characterised by high wind speeds and heavy rain. Prerequisite conditions:
- Location: Between ...

Find dy/dx

Remember quotient rule dy/dx=(u'v-v'u)/v^2

u=4x       u'=4

v=x^2+5         v'=2x

dy/dx=(20-4x^2)/(x^2+5)^2 (simplified)

∫ 5e^3-4x dx=5∫e³ e^-4x dx=5e³ ∫e^-4x d=5e³ [(-1/4)e^-4x ]=-(5/4)e³e^-4x =-(5/4)e^3-4x...