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The key point to recognise here is that an object undergoing a circular orbit around the Earth is undergoing circular motion. Circular motion is caused by a centripetal force (acting towards the centre...

This question is 4 marks so you need to make at least 4 points.

These types of questions just require memorising the 4 points:

Lots of molecules collide with the walls.

We need to show that car A is safer than car B and this is done by showing that the force is greater on car B than car A.

Start by finding the force on car A, total mass 1580kg:

The first question comes from the realisation that the power rating, "9W" represents 9 joules being supplied every second and so can be written as 9J/s and so in 5 minutes (o...

For the first part of the question we note that the resistors are in series, this means we can simply add together the resistance, giving a value of:
15 ohms

For the second part we ...