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The first step would be to consider each of the powers individually, work out their value and then proceed with the subtraction to end up with a result. Firstly, as this question is to be done without a c...

1. Thin walls for short diffusion path 2. Narrow, so have a large surface area to volume ratio 

i) There first step is to acknowledge the need for both product rule (d(uv)/dx=v.du/dx+u.dv/dx) and chain rule (dz/dx=dz/dy*dy/dx). Here, u=x^3 and v=ln(2x). Therefore, du/dx=3x^2 which is a standard diff...

Firstly, we note that the acceleration is constant, therefore this problem should be tackled with the SUVAT equations. Let's write down the information we have: s  we are asked to find this u = 50 m/s v =...

Being presented with an unseen text in a timed exam can seem intimidating, but actually this question is an opportunity to boost your marks. This is the only situation when everyone takin...