Top answers

I often understand the question and think I have answered it correctly, but I don't get all the marks for my answer. What am I doing wrong?

One of the things that you need to remember about Biology A Level is that you have to memorise the key points of the mark scheme. Something that I consistently struggled with when I was doing past papers is ...
SM
Answered by Shannon M. • Biology tutor
7223 Views

Describe the pathway of electrical activity in the heart during contraction.

The sino-atrial node (SAN) is located within the wall of the right atrium, and acts like a pacemaker (it instigates the rhythms of the heart). The SAN sends out regular waves of electrical activity along the...
JR
Answered by Jack R. • Biology tutor
7285 Views

In what ways did Manet's "Olympia" deviate from conventional depictions of the female nude?

This painting presented a clear challenge to the typical academic female nude. The conventional female nude was Classically modelled, with an even, well proportioned, alluring feminine body, of the type that...
PK
3951 Views

Describe Newton's second law.

Newton's second law, F=ma, describes the relationship between an external force on an object F, the mass of the object m and the resulting acceleration of the object a. We can see that the acceleration of th...
HB
Answered by Harry B. • Physics tutor
3612 Views

why is sin(x) squared plus cos(x) squared 1?

Thinking of sine and cosine as ratios of side lengths in a right angled triangle, sin(x) = o/h and cos(x) = a/h, so the sin(x)^2 + cos(x)^2 becomes (o^2 + a^2)/h^2. By Pyhtagoras, o^2 + a^2 = h^2, so we get ...
MS
Answered by Matthew S. • Maths tutor
23975 Views