Top answers

What are the similarities and differences between gravitational and electric fields?

Both gravitational and electric field obey inverse square laws (e.g. F(grav)=GMm/r^2 and F(electric)=kq1q2/r^2 where GMm and kq1q2 are constants). They both act between two bodies without any means of contac...
Answered by • Physics tutor
87087 Views

Outline how neurons generate a resting potential

Neurons use a sodium potassium pump to maintain a resting potential in the body. Inside a cell normally, there are more sodium in the cell and fewer potassium outside the cell, and hence there is a negative ...
Answered by • Biology tutor
8173 Views

Rationalise the denominator of the following fraction: 9/((root13)-1). Write your answer in its simplest form.

Firstly, a quick overview of rationalising the denominator. For this, we want to make sure that the bottom half of the fraction (the denominator) is rationalised (and so doesn't contain any surds any more). ...
CC
Answered by Callum C. • Maths tutor
3371 Views

What is an empirical formula and how do I calculate it?

The empirical formula of a compound is the simplest ratio of the atoms present in that compound and it can be calculated relatively easily by following a few simple steps:Let's use an example of a hydrocarbo...
VO
5110 Views

How does DNA undergo replication?

Firstly, the enzyme DNA Helicase breaks the hydrogen bonds present between base pairs. This allows the DNA double helix to unravel, exposing the DNA bases. Free DNA nucleotides then bond to the exposed base ...
VO
Answered by Victoria O. • Biology tutor
6055 Views