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# Tutor profile: Monika M.

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Monika M.
Teacher with a prior major in physics
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## Questions

### Subject:Physics (Waves and Optics)

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Question:

The Sun is our source of warmth and it keeps Earth's temperature habitable. Your friend has heard that space is a vacuum and that there is nothing there. They have also heard that light is a wave. They are perplexed as to how the heat from the Sun can then get to Earth as there is nothing in space for the waves to travel through. Explain to your friend how the energy from the Sun get to Earth through the vacuum of space.

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Monika M.

The introduction of your friend in the question shows that a more informal answer is desired. This is to keep you from giving an answer from memory and to rather show that you understand the phenomenon in question. In general it is best to always rather understand things in physics than memorising it. Your answer should be something along the lines of: Well it is actually easy to understand my friend. The Sun, as you know, gives off light. Light itself has energy inside of it. When there is a large light source like a fire for a barbecue you can feel the heat of it. That is the light's energy being carried over to your skin. Something unique about light is that even though it is a wave it does not require any medium to travel. So the fact that space is a vacuum makes no bit of a difference for the light and it will still bring warmth to our planet. The main things that are needed in this answer is that light is self-propagating and that light carries energy from one point to another. Using an example of everyday things will only help to show that you understand the given phenomenon.

### Subject:Physics (Electricity and Magnetism)

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Question:

Two charged spheres A and B are suspended with a piece of non conductive material and held in place. Sphere A has a charge of 5C. Sphere B has a charge of -3C. The two spheres are released. 1. What series of events will you observe if the spheres are released? 2. What will the charge be of sphere A at the end of the series of events in question 1.

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Monika M.

The first question is testing if you understand how charges behave. The second question requires you to do a calculation based on your answer in question 1. 1. Quite often you will not be given a drawing. If you do not have a drawing it is best to draw the problem yourself just to help make sure you understand the problem correctly. The answer for question 1 will be something along the lines of: Sphere A and B are oppositely charged and will therefore be attracted to each other. Once they touch each other the electrons from sphere B will be transferred to sphere A until they are equally charged. Since the positive charge is the bigger charge they will both then be positively charged and will repel each other. The 3 main parts in this that you must state is that they will initially attract one another; that charge will be transferred on contact until they are equally charged; and that the resulting charge will drive them apart again. (Note: Remember, like charges repel and opposite charges attract) 2. Keeping in mind that the spheres will have the exact same charge after they touched each other we will just have to calculate the average charge of the two spheres. Your textbook will quite likely have given you the following equation: \$\$(q_1 + q_2)/2\$\$ If you look close at it you will notice that it is simply calculating the average. So what we will do is add both charges together and then divide by 2. \$\$(5 - 3)/2\$\$ \$\$ = 1C\$\$ (Note: Remember to make sure that you write in your units else it can be anything ranging from Coulomb to bears.) Sometimes you will get a mark for using the correct formula; so it is best to write out the entire solution as below: \$\$(q_1 + q_2)/2\$\$ \$\$= (5 - 3)/2\$\$ \$\$ = 1C\$\$

### Subject:Algebra

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Question:

Fully factorise the following expression: \$\$4x^2 + 10xy + 6y^2\$\$

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Monika M.

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