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Homework help :-(
Frith
Posts: 8,828 Forumite
I wondered if anyone would mind explaining my son's homework to me so I can help him with it later on today!
It is all about heat transfer by radiation, convection and conduction. He has to make a poster or leaflet advertising a new sort of material that prevents heat loss in those 3 ways.
That would be OK but then there are list of criteria he has to meet so he will be trying to shove other bits of information in the poster! I really don't like these mini projects where the idea is simple enough but then he has to sort of shuffle things round to include everything they want. I think they make the work very stilted.
The bits I don't understand well enough are:
"explain why the transfer of energy by radiation does not involve particles" I know it doesn't but can't explain why not!
"Explain why opaque clothing should reduce the transfer of heat by radiation". Does that mean it stops the suns rays getting in? Or, if you were wearing an opaque coat, it would stop your heat getting out??
"Give some examples of how different materials can be used to decrease radiation"
"Describe convection using ideas about density"
"Explain how convection currents work in liquids and gases".
"Explain how sweating causes cooling, in terms of particles"
The questions above are about 1/3 of what he has to do. He's just 13. :eek:
It is all about heat transfer by radiation, convection and conduction. He has to make a poster or leaflet advertising a new sort of material that prevents heat loss in those 3 ways.
That would be OK but then there are list of criteria he has to meet so he will be trying to shove other bits of information in the poster! I really don't like these mini projects where the idea is simple enough but then he has to sort of shuffle things round to include everything they want. I think they make the work very stilted.
The bits I don't understand well enough are:
"explain why the transfer of energy by radiation does not involve particles" I know it doesn't but can't explain why not!
"Explain why opaque clothing should reduce the transfer of heat by radiation". Does that mean it stops the suns rays getting in? Or, if you were wearing an opaque coat, it would stop your heat getting out??
"Give some examples of how different materials can be used to decrease radiation"
"Describe convection using ideas about density"
"Explain how convection currents work in liquids and gases".
"Explain how sweating causes cooling, in terms of particles"
The questions above are about 1/3 of what he has to do. He's just 13. :eek:
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Comments
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Why are you doing his homework for him? Surely he has covered these topics in school and if not he needs to ask the teacher to explain to him - not you!0
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Google is your friend here, ds has lots of these projects and we always use google, wish we had it in my day!
Make sure he reads then puts into his own words though and I get ds to write down which website he used.I don't get nearly enough credit for not being a violent psychopath.0 -
Caroline_a wrote: »Why are you doing his homework for him? Surely he has covered these topics in school and if not he needs to ask the teacher to explain to him - not you!
My understanding of these projects is that they are about learning how to research and convey information, we use the internet and the library.I don't get nearly enough credit for not being a violent psychopath.0 -
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His homework is one mini project each week (a different subject). It is rarely anything they have even touched on in class but is always something new for them to research. The projects vary but usually the guideline is between 2 and 4 hours (actually, the time isn't written on this one).
On top of this he gets French vocabulary, English and maths plus reading and accelerated reading.
I am not "doing it for him" but he is going through a stage of showing no interest whatsoever in school or homework so I like to be able to answer any questions sensibly when they arise.0 -
Kids get way too much homework. They should have a break!"Growth for growth's sake is the ideology of the cancer cell" - Edward Abbey.0
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It's nice you're taking an interest in his school work. GCSE bitesize is a good resource as posted above, as well as the s-cool website and sparknotes for English homework.
It's also nice the teachers are making them do the research themselves, instead of spoon feeding them information that doesn't get absorbed. At least this way, he's forced to read and research before answering, instead of scanning his teachers notes for answers! This method should cover every students way of learning, including visual, audio and kinetically.0 -
"explain why the transfer of energy by radiation does not involve particles" I know it doesn't but can't explain why not!
Radiation does not require atomic particles to transfer heat between objects. Because of this, energy can be transferred across vacuums (e.g. in space) through means of electromagnetic waves. Shorter wavelengths (e.g Gamma waves). transfer more energy than long wavelengths (e.g. radio waves).
"Explain why opaque clothing should reduce the transfer of heat by radiation". Does that mean it stops the suns rays getting in? Or, if you were wearing an opaque coat, it would stop your heat getting out??
Both.. Thicker, opaque clothing has less gaps in the material to allow energy transfer. Think about how wifi reception is effected by a well built house, compared to a greenhouse.
"Give some examples of how different materials can be used to decrease radiation"
The metal lead can stop gamma radiation. Shiny materials (e.g. a mirror) reflects radiation, such as infrared and reduces radiation absorption.
Not wanting to do all the homework, i'll re-point you to the link someone else provided http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/energy/heatrev1.shtml0 -
"explain why the transfer of energy by radiation does not involve particles" I know it doesn't but can't explain why not!
Because it's just radiating the energy and so does not need any touching particles or moving particles to pass the heat on.
"Explain why opaque clothing should reduce the transfer of heat by radiation". Does that mean it stops the suns rays getting in? Or, if you were wearing an opaque coat, it would stop your heat getting out??
Shiny surfaces radiate heat better. So opaque clothing will keep you warmer (your body temperature is higher than the ambient temperature so it's all about keeping heat in).
"Describe convection using ideas about density"
Are you such that's not conduction? If not, then the denser the material, generally the slower the convection.
"Explain how convection currents work in liquids and gases".
Particles are heated - material expands as the particles have more energy and so take up more space - density decreases - particles rise, move along and colder material takes it's place underneath. As particles move away from the heat, they cool down, material becomes more dense and so they sink - creating a convection current.
"Explain how sweating causes cooling, in terms of particles"
Water has a high latent heat of vaporisation - which means that it takes a lot of energy to get it to evaporate. As particles of sweat (water) evaporate from the skin, they need energy to do so (as they are breaking the intermolecular hydrogen bonds held in the water). So they take this energy from the surface of the skin - thus reducing the temperature of the skin in the process."One day I realised that when you are lying in your grave, it's no good saying, "I was too shy, too frightened."
Because by then you've blown your chances. That's it."0 -
:eek: Thank God Im not at school anymore0
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