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How can there be both molecular and non-molecular solids?

Non-molecular solids are of the type of metallic and ionic solids. They are held together by the strong electrostatic interactions of polar particles like ions and electrons. For example in metals the strong...
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Answered by Gregory P. • Chemistry tutor
7142 Views

How do you work out the work out the current through resistors in parallel?

[I would use the whiteboard to draw diagrams as I was talking] A good analogy for circuits is that of water pipes. The wires are nice wide pipes with no resistance to flow. Resistors are sections of narrow p...
Answered by • Physics tutor
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Why will antibiotics not cure the flu? Why should they not be overused?

The Flu is caused by the Rhinovirus. Antibiotics can only kill bacteria not viruses as viruses have different machinery to survive and replicate. Antibiotics have nothing to target in Viruses. Overuse of ant...
Answered by • Biology tutor
2794 Views

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
3586 Views

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
2101 Views