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Using Newton's law of gravitation, derive a suitable formula for the escape velocity of an object at Earth's surface.

Newton's law of gravitation is;
F = GMm/(r2)
Where G is the Universal Gravitational constant, M is the mass of Earth, m is the mass of the object and r is the radius of Earth (no valu...

CM
Answered by Charlie M. Physics tutor
4951 Views

How do I demonstrate good close reading in an exam?

The key to good close reading is understanding the text: read the passage through slowly and carefully, and make sure you understand what’s happening. If it’s a poem, what is the poet trying to say? Or wh...

CC
3796 Views

What is the Highest Common Factor of 8 and 24

You would first want to draw out a tree diagram (example given by whiteboard) and divide the number given e.g. 8 in the question by prime numbers e.g. 8 can be split into two branches 2 and 4. 2 is a prim...

FR
Answered by Faisal R. Maths tutor
3224 Views

Bob earns £7.70 an hour, and he works 30 hours per week. If Bob has 28 days of unpaid holidays to take, how much does he earn in a year? Also will he be taxed? (Bob will be taxed if he earns over £10000 in one year)

28 days holidays is equivalent to 4 weeks holiday. So in total works for 48 weeks. Now Bob works 30 hours per week, multiply this by 48 giving 1440 hours for his working year. So in order to solve for his...

CY
Answered by Christopher Y. Maths tutor
2813 Views

What are firewalls? Explain and discuss three methods they employ to secure a network. [8]

So the first thing to do for this question is break down the question into what the marks will be given for. As this question is not testing written communication you do not need to worry about writing lo...

BM
Answered by Bhavik M. Computing tutor
2437 Views

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