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A cannon at ground level is firing at a fort 200m away with 20m high walls. It aims at an angle 30 degrees above the horizontal and fires cannonballs at 50m/s. Assuming no air resistance, will the cannonballs fall short, hit the walls or enter the fort?

solving horizontally, use v=s/t, where s=200, v=25(3) 1/2 . Hence t=s/v=8/(3) 1/2 (where t is the time when the ball would reach the fort if it does not reach the ground)Solivng vertically, s=?, u=25, v is i...
Answered by • Maths tutor
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How should I structure my answer to a purposive writing question? (e.g. writing a speech, letter or article)

The most important thing to remember is that this type of question is testing your ability to write a clear and organised piece. Naturally, it is important to write in the correct form (framing your letter f...
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Answered by Emilie D. • English tutor
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List and briefly explain the two main mechanisms by which mammalian genes can be exchanged or 'translocated' between chromosomes. What are the importance of these types of recombination? (8 marks)

i. Homologous Recombination. A conservative, error-free DNA replication pathway that mainly allows for the repair of DNA under duress and also for the resetting of replication forks. The pathway is regulated...
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Answered by Benjamin A. • Biology tutor
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In terms of electrons, explain the bonding in sodium chloride

Sodium is on group 1 and has 1 election in its outer shell. Chloride is in group 7 and has 7 electrons in its outer shell.Sodium looses 1 electron and chlorine gains 1 electron giving both atoms a full outer...
Answered by • Chemistry tutor
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Describe the stages of mitosis.

ProphaseFirst, the chromosomes condense down which consists of sister chromatids.2. MetaphaseThen, each chromosome lines itself up at the equator of the cell in their homologous pairs.3. AnaphaseIn this stag...
Answered by • Biology tutor
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