Top answers

A pot of water is heated to 100C and then placed in a room at a temperature of 18C. After 5 minutes, the pan temperature falls by 20C. Find the temperature after 10minutes.

(The rate at which the temperature of a body falls is proportional to the difference between the body temperature and the room temperature) - this would be given in the question. This is a typical ordinary d...
AC
Answered by Asher C. • Maths tutor
6960 Views

What is the most efficient way of structuring a history GSCE or an A-level essay question?

The most common question asked by all History students are to do with the way in which they are expected to structure an essay and how to stick to the question asked. It is so easy to lose out on marks just ...
AG
Answered by Aldona G. • History tutor
2696 Views

How can I find out the Young's modulus of a material?

Right, so the Young's modulus of a material is a measure of it's rigidity. The higher the value of the Young's modulus, the more rigid the material is.Ok, so the Young's modulus, E, is equal to the stress th...
WS
Answered by William S. • Physics tutor
7285 Views

Two identical uniform spheres each of radius R are placed in contact. The gravitational force between them is F. They are then separated until the force between them is one ninth of the magnitude. What is the distance between the surfaces of the spheres?

With electostatics, it is important to remember that inthe equation giving the force between two point charges, the force is inversely proportional to the square of the distance of the charges. It is importa...
MS
Answered by Mrinank S. • Physics tutor
24014 Views

Why does the solubility of Group 2 hydroxides in water increase down the group?

Firstly, we must consider the thermodynamics involved It is known that a reaction is spontaneous due to thermodynamic favourability if the Gibbs Free Energy is negative. This is further broken down to entrop...
EN
Answered by Eleni N. • Chemistry tutor
17294 Views