Top answers

Work out the value of 5^3-5^2:

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 calc...
AB
Answered by Alexander B. • Maths tutor
14041 Views

Oxygen is exchanged between the blood capillaries and the tissues. Give two ways in which capillaries are adapted for exchanging blood with the tissues.

Thin walls for short diffusion path 2. Narrow, so have a large surface area to volume ratio
LG
Answered by Leila G. • Biology tutor
5070 Views

Differentiate with respect to x: i) y=x^3ln(2x) ii) y=(x+sin(2x))^3

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 differe...
EM
Answered by Edward M. • Maths tutor
10205 Views

An aeroplane lands on the runway with a velocity of 50 m/s and decelerates at 10 m/s^2 to a velocity of 20 m/s. Calculate the distance travelled on the runway.

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 = 20 ...
PF
Answered by Paolo F. • Physics tutor
9665 Views

How do I approach an unseen question in an exam situation?

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 taking the exam is in the...
RG
Answered by Ruby G. • English tutor
8708 Views