Ellmeister Posted January 7, 2008 Posted January 7, 2008 Twas in gifted and talented. We made a basically made a short movie of random things and presented it at the victoria and albert museum. Thats about it
Paj! Posted January 7, 2008 Posted January 7, 2008 Can someone revise for my prelims? Preferably 10-15 hours a week for the last 3 weeks? Thanks.
dwarf Posted February 9, 2008 Posted February 9, 2008 each statement is false. rewrite each one as a true statement (im crap at science) green plants photosynthesise all day and all night in summer photosynthesis takes place in the roots of a plant roots hold a plant in the ground and absorb carbon dioxide for photosynthesis oxygen combines with water to make food for a plant to catch as much light as possible leaves are narrow and flat (broad + flat) the reactants of photosynthesis are glucose and oxygen ( carbon dioxide + water) green plants store carbohydrates in the form of glucose in the leaves a green water plant will produce more bubbles of carbon dioxide if the light intensity increases chopping down lots of trees will increase the greenhouse effect because the amount of nitrogen in the atmosphere is increased (carbon dioxide) chloroplast is the green pigment that is found in leaves brackets mean my thoughts of an obvious answer
MoogleViper Posted February 9, 2008 Posted February 9, 2008 green plants photosynthesise all day and all night in summer I think they do it at day but respire day and night photosynthesis takes place in the roots of a plant Leaves roots hold a plant in the ground and absorb carbon dioxide for photosynthesis Hold a plant, take water and nutrients oxygen combines with water to make food for a plant respiration = glucose + oxygen = water + carbon dioxide + energy to catch as much light as possible leaves are narrow and flat (broad + flat) Broad and flat green plants store carbohydrates in the form of glucose in the leaves starch isn't it? chloroplast is the green pigment that is found in leaves Chlorophyl I think that's right but it was ages ago that I did this so I'll wait for somebody else to come and correct me.
Gizmo Posted February 9, 2008 Posted February 9, 2008 green plants photosynthesise all day and all night in summer All day, can't at night as it needs sunlight photosynthesis takes place in the roots of a plant in the leaves roots hold a plant in the ground and absorb carbon dioxide for photosynthesis absorb water and nutrients to sustain the plant oxygen combines with water to make food for a plant can't remember this one to catch as much light as possible leaves are narrow and flat (broad + flat) broad and flat the reactants of photosynthesis are glucose and oxygen ( carbon dioxide + water) think your right green plants store carbohydrates in the form of glucose in the leaves not sure a green water plant will produce more bubbles of carbon dioxide if the light intensity increases shouldnt it be less? not sure though chopping down lots of trees will increase the greenhouse effect because the amount of nitrogen in the atmosphere is increased (carbon dioxide) carbon dioxide will increase chloroplast is the green pigment that is found in leaves chlorophyl
Konfucius Posted February 9, 2008 Posted February 9, 2008 green plants photosynthesise all day and all night in summerI think they do it at day but respire day and night photosynthesis takes place in the roots of a plant Leaves roots hold a plant in the ground and absorb carbon dioxide for photosynthesis Hold a plant, take water and nutrients oxygen combines with water to make food for a plant respiration = glucose + oxygen = water + carbon dioxide + energy to catch as much light as possible leaves are narrow and flat (broad + flat) Broad and flat green plants store carbohydrates in the form of glucose in the leaves starch isn't it? chloroplast is the green pigment that is found in leaves Chlorophyl I think that's right but it was ages ago that I did this so I'll wait for somebody else to come and correct me. I'm not a plant expert either however I think you are correct, good Sir. here's what I think I can add: a green water plant will produce more bubbles of carbon dioxide if the light intensity increases not carbon dioxide but oxygen chopping down lots of trees will increase the greenhouse effect because the amount of nitrogen in the atmosphere is increased (carbon dioxide) not nitrogen but carbon dioxide
dwarf Posted February 9, 2008 Posted February 9, 2008 cheers guys, just to let you know i knew the chlorophyll one but forgot to bracket it. good help thanks a lot. and what would the answer be to this write as power of 2 as simply as possible: 0.125 1 2cubed x square root 2 (2power1) 2n x 2n +1
MoogleViper Posted February 9, 2008 Posted February 9, 2008 I do not know that you are asking there. Is it 4 questions or one? If it's 4 then I think you are asking for it in indeces. 0.125 = 2^(-3) 1 = 2^0 2³ x 2^(1/2) = 2^(7/2)
Supergrunch Posted February 9, 2008 Posted February 9, 2008 Corrections: green plants photosynthesise all day and all night in summerAll day, can't at night as it needs sunlight photosynthesis takes place in the roots of a plant in the leaves roots hold a plant in the ground and absorb carbon dioxide for photosynthesis absorb water and nutrients to sustain the plant oxygen combines with water to make food for a plant It combines with carbon dioxide. to catch as much light as possible leaves are narrow and flat (broad + flat) broad and flat the reactants of photosynthesis are glucose and oxygen ( carbon dioxide + water) Yep, carbon dioxide and water. green plants store carbohydrates in the form of glucose in the leaves In the form of starch. a green water plant will produce more bubbles of carbon dioxide if the light intensity increases More bubbles of oxygen. chopping down lots of trees will increase the greenhouse effect because the amount of nitrogen in the atmosphere is increased (carbon dioxide) carbon dioxide will increase chloroplast is the green pigment that is found in leaves Chlorophyll 2n x 2n +1 For this one do you mean 2^n x 2^(n+1)? If so, the answer is 2^(2n+1).
dwarf Posted February 9, 2008 Posted February 9, 2008 Corrections: For this one do you mean 2^n x 2^(n+1)? If so, the answer is 2^(2n+1). yeah i think, power (n + 1), not 2^n + 1 can someone tell me: write as product of powers 2&3 as simply as possible: is 12^(2/3) = (2^2 x 3^1) ^2/3 ? I swear if fukd that up also, for same question 18^3n ---- is it something like 2^1 x 3^2n ? finally write each number as a product of its prime factors. use indicies where possible (please explain to me too) 192 1400 12 375 thanks to moogle,grunch and others for help
dwarf Posted February 11, 2008 Posted February 11, 2008 Economics project called business organisation: i need to know what areas of business private limited companies cover, some facts and figures about them and some examples of sole trader, partnership, private limited and public limited companies
Ginger_Chris Posted February 11, 2008 Posted February 11, 2008 yeah i think, power (n + 1), not 2^n + 1 can someone tell me: write as product of powers 2&3 as simply as possible: is 12^(2/3) = (2^2 x 3^1) ^2/3 ? I swear if fukd that up also, for same question 18^3n ---- is it something like 2^1 x 3^2n ? finally write each number as a product of its prime factors. use indicies where possible (please explain to me too) 192 1400 12 375 thanks to moogle,grunch and others for help 12^(2/3) = (2*2*3)^(2/3) = ((2^2) * (3^1))^(2/3) like you said = (2^(4/3))*(3^(2/3)) slightly simpler 18^3n = (3*3*2)^(3n) = ((3^2)*2)^3n =(3^6n)*(2^3n) Prime factors, best way to do it is to divide by lowest prime 2, until its no longer a whole number, then move to the next one until you left with a prime. eg: 192 192/2 = 96 96/2 = 48 48/2 = 24 24/2 = 12 12/2 = 6 6/2 = 3 (prime) therefore 192 = 2*2*2*2*2*2*3 = (2^6) * 3 1400 1400/2 = 700 700/2 = 350 350/2 = 175 (not divisible by 2 or 3) 175/5 = 35 35/5 = 7 (prime) therefore 1400 = 2*2*2*5*5*7 = (2^3) * (3^2) * 7 12375 12375/3 = 4125 4125/3 = 1375 (not divisible by 3) 1375/5 = 275 275/5 = 55 55/5 = 11 (prime) therefore 12375 = 3*3*5*5*5*11 = 3^2 * 5^3 *11 oh and randomly 1001 = 7 * 11 * 13, it's a nice one to remember
dwarf Posted February 11, 2008 Posted February 11, 2008 Coolness! Name change to Legendary_Chris needed
dwarf Posted February 11, 2008 Posted February 11, 2008 What happened to the name of the thread? what did happen to the title of the thread. how could it have been called anything else. Surely it should be the maker of the thread that names it right? who is atomic boo anyway? another boo fan!
Supergrunch Posted February 12, 2008 Posted February 12, 2008 Moria changed the name ages ago, it's been this ever since then.
Twozzok Posted February 25, 2008 Posted February 25, 2008 Any of you maths people wanna help with this integration by substitution? INTGRL( (X^3) / (SQRT(4+X^2)) ) (boundraries of 1,0) Need to use u=4+x^2 Apparently I can get it down to u-4/SQRT U But I don't know how ¬_¬
The fish Posted February 25, 2008 Posted February 25, 2008 Any of you maths people wanna help with this integration by substitution? INTGRL( (X^3) / (SQRT(4+X^2)) ) (boundraries of 1,0) Need to use u=4+x^2 Apparently I can get it down to u-4/SQRT U But I don't know how ¬_¬ Just did something like this! Urgh, just typed out a load of working, then realised I'd gotten into a worse position. I'm normally very good at these, that one is complete whore IMO... Sorry.
Twozzok Posted February 25, 2008 Posted February 25, 2008 It's to do with using du/dx=2x and changing it into dx=du/2x once you do that it becomes a lot simpler.
chairdriver Posted February 25, 2008 Posted February 25, 2008 Somebody please help, I really hate this type of question: 47231 is a five-digit number whose digits sum to 4 + 7 + 2 + 3 + 1 = 17. How many five-digit numbers are there whose digits sum to 39?
The fish Posted February 25, 2008 Posted February 25, 2008 It's to do with using du/dx=2x and changing it into dx=du/2x once you do that it becomes a lot simpler. I got way, way beyond that, and got a nasty equation. If you have no luck with anyone else, once I've finished a mechanics paper I'm doing, I'll give it a crack on paper.
Twozzok Posted February 25, 2008 Posted February 25, 2008 I did it, it was something like 1/3*(16 - 7*ROOT5)
The fish Posted February 25, 2008 Posted February 25, 2008 I gave it another try on paper, and I think I made a numerical error, as I got a similar format answer, but different figures. Ah, well, if you got it, well done.
Supergrunch Posted February 26, 2008 Posted February 26, 2008 Any of you maths people wanna help with this integration by substitution? INTGRL( (X^3) / (SQRT(4+X^2)) ) (boundraries of 1,0) Need to use u=4+x^2 Apparently I can get it down to u-4/SQRT U But I don't know how ¬_¬ I get the integral from 4 to 5 of (u-4)/2sqrt(u), though I may have made an error. Somebody please help, I really hate this type of question: 47231 is a five-digit number whose digits sum to 4 + 7 + 2 + 3 + 1 = 17. How many five-digit numbers are there whose digits sum to 39? Dear god, you're setting us STEP questions now? I'll have a go, but don't expect a solution... Edit: I give up, I have other work to do. It does help to post all of a STEP question though - in this case "Show that there are 15 five-digit numbers whose digits sum to 43. You should explain your reasoning clearly."
Chuck Posted February 26, 2008 Posted February 26, 2008 A ball is dropped from a horizontal plane and rebounds successfully. The height above the plane is reached by the ball after the first impact with the plane is 4m. After each impact the ball rises to a height which is 3/4 of the height reached after the previous impact. Calculate the total distance traveled by the ball from the first impact until it comes to rest. Thanks
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