20025 questions

Solve algebraically: 1) 6a + b = 16, 2) 5a - 2b = 19

Firstly multiply the first equation by 2 resulting in the equation 12a + 2b = 32. Following this, add the first equation to the second equation, this will result in the 2b cancelling out with just 17a = 51. Divide this equation by 17 to get the result a=3.
You can use this result in your original equation replacing the variable a with your answer so you for example in the second equation instead of 5a - 2b = 19, you would now have 5(3) - 2b = 19. Simplify this equation to get the result 15 - 2b = 19, simplify further to get -2b = 4. Lastly divide both sides by -2 to get the answer b = -2
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Andrew S.

Answered by Andrew, tutor with MyTutor

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A jug containing 0.250 kg of liquid is put into a refrigerator. Its temperature decreased from 20°C to 15°C. The amount of energy transferred from the liquid was 5,250 J. Calculate the specific heat capacity of the liquid.

Using the equation Q = mcT, where Q represents energy in Joules, m represents mass in kg, c represents specific heat capacity measure in joules kg-1 K-1 and lastly, T represents the change in temperature in celcius or kelvin. Firstly rearrange the equation to make specific heat capacity the subject of the equation. This will result in the equation c = Q/(mT). Now we can use the figures from the explanation of the problem and replace the variables in the equation.
We are told that the mass of the liquid is 0.250 kg, the change in temperature is from 20 degrees celcius to 15 degrees celcius so there is a change in 5 degrees celsius and the total energy transferred was 5250 J. So by replacing the variables with the given figures we get the result that c = (5250)/(0.250 x 5), by simplifying this we get the result that the specific heat capacity of the liquid is 4200 J kg-1 K-1.
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Andrew S.

Answered by Andrew, tutor with MyTutor

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How to answer short questions about the text from the reading insert?

First thing you have to remember, when answering these questions, is that it is absolutely crucial for you to understand what the question is actually asking you. Read the question several times and underline the key words. Then find the appropriate fragment in the text that talks about the issue mentioned in the question. Once you have done that there are two approaches you can use. They should both score you full marks on the actual exam:
Copy the exact answer from the text, without changing any words. Answer the question using your own words (more risky, but if done accurately will be alright).
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Natalia S.

Answered by Natalia, tutor with MyTutor

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What is saltatory conduction?

·   Myelin sheath is an insulating layer of fatty material, composed of Schwann cells wrapped tightly around the neurone.·   Sodium and potassium ions cannot diffuse through this fatty layer.·   In between the Schwann cells are small gaps- the nodes of Ranvier.·  Therefore, the ionic movements that create an action potential cannot occur over much of the length of the neurone: they occur only at the nodes of Ranvier.·   In myelinated neurones the local currents are therefore elongated and sodium ions diffuse along the neurone from one node of Ranvier to the next.·  This means that the action potential appears to jump from one node to the next.·  This is called saltatory conduction.

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Natalia S.

Answered by Natalia, tutor with MyTutor

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What are the advantages of saltatory conduction?

· The myelin sheath means that action potentials can occur only at the gaps between the Schwann cells that make up the myelin sheath.· Effectively the action potential jumps from one node of Ranvier to the next.· This speeds up the transmission of the action potential along the neurone.· Myelinated neurones conduct action potentials more quickly than non-myelinated neurones.· A myelinated neurone can conduct an action potential at up to 120 ms-1.
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Natalia S.

Answered by Natalia, tutor with MyTutor

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How might I write an answer to the question 'Explore how the prologue to Romeo and Juliet introduces the theme of violence in the play?'

The prologue, a fourteen-line sonnet, introduces the theme of violence between two families through the imagery of bloody hands: ‘where civil blood makes civil hands unclean’. The fact that blood will be staining otherwise ‘civil’ hands suggests unprecedented amounts of violence and forebodes murder and death. The two parties are described as ‘foes’ who have ‘continuance of […] rage’, implying a long-running feud which is impossible to end (‘nought could remove’). This suggests an ongoing violence which is anticipated to only get worse: It is said that an ‘ancient grudge’ is going to ‘break to new mutiny’, suggesting that violence will erupt and the ‘grudge’ will come to a violent climax. Furthermore, the passage introduces the theme of violence which occurs between the play’s lovers. They are described as ‘star-crossed lovers’ who ‘take their life’, implying that their untimely deaths are written into fate, foreboding that the play will revolve around some sort of violence against them and their ‘death-mark’d love’. The sonnet’s rhythm of iambic pentameter also helps to emphasize the inevitability of their deaths as the determined, fixed beat spurs the passage onwards. 
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Rachel H.

Answered by Rachel, tutor with MyTutor

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How do I achieve the correct balance of assessment objectives in my essay?

The most important thing before trying to apply the AO's to your essay is to make sure you have an in-depth understanding of what each objective looks like in your writing. In your last essay, use highlighters to colour code the frequency of each AO (this will also allow you to identify what the examiner is looking for when they mark your work themselves). From here, compare your essay with the assigned assessment objectives, e.g. perhaps you don't have enough AO3 in your writing? Emphasise this aspect in your next essay. If the issue is that you don't feel confident in AO3 then WELL DONE you have now found a revision focus.
Tailoring your writing to a set of determined assessment objectives can be challenging but the best way to reach that balance is to keep a list of the objectives next to you and use it as a guide while you work. If you are pushing yourself to get a top band answer, the terminology of the objectives can also be highly technical so, again with your highlighter, pick out key words such as 'developed' and 'consistent' to remind yourself what the examiners are looking for.
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Skye F.

Answered by Skye, tutor with MyTutor

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How can I develop a character from a text-based play?

To develop a character, first look closely at the information given to you in the text. There may even be a character description with their age, their relationships etc - if so, start there. If not, analyse the character's lines. Ask questions like how do they present themselves? What are their relationships? What are their motivations? It can be useful to do some wider research. If the play is set in a particular location or period of history, some research into that can contextualise the character and help you to understand the world they live in.
After that, you just need to use your imagination to really flesh out the character and fill in any gaps. How old are they? What do they look like? What do they think of the other characters? What do they want? What do they do for fun? It can be useful to try to answer these sort of questionnaire questions in character by "hotseating" to really get to know the details.
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Hannah M.

Answered by Hannah, tutor with MyTutor

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