Homework Help

Our teacher set us this problem and said he wont give any answers until somone gets it. No one has any idea how to even begin it. Help? "How old are your three children?" the mathematics master asks his former student. He is told their ages add to 13, and multiply to give the number on his study door (which they can both see). "I will need to know more", the master says. After a few moments reflection. "The eldest one is learning to play the violin", replies his former pupil. "Ah! in that case I can now give you their ages", the master tells him, and does so correctly. How does he know? What are their ages? What is the number on the door?

So our assignment is to build a vertical egg launcher. materials are all inclusive. the egg can be in a container - our plan includes a protective box the size of a tissue box. the launcher must be able to fit in a 3 meter2 box and be able to be lifted by two high school aged kids. it is graded by time in air and points are subtracted for horizontal travel distance. any ideas????

Hi. I'm doing an experiment for science where we test the effect of colour on childrens memory. Most statements I can find apply directly to adults not children - which will be good if there is a specific reason why children remember colours more... Heres our opening paragraph: Focus on the bit in bold firstly, am I correct in saying this? and secondly how can I expand on this further and more relevant to our report? Help appeciated:D!!!

Forget it, my friend already helped me.

pretty much I have to write an essay about energy production in japan. If any one knows any good sites please post them on the thread, I would greately appreciate it

I'm doing an experiment with aluminum wires, and when I put them in saltwater, they starting growing these orangish blobs. Then, in regular water, they looked darker in some parts. In air, obviously nothing happened. Can anyone explain what the heck happened with the wires in saltwater because I'm clueless right now? :confused::confused:

Hi there, I am an arts student who, due to signing up for classes very late in the semester, has been stuck with an environmental sciences course. This course was just fine until I got our final assignment, which is a Water Quality Index lab. The math in it is just plain scary. Not only do I not have the background to do this, but I have not done any form of mathematics since I was 17 and in highschool. I have posted the equation and data given to me in class. Can anyone help me? (the assignment is due tomorrow). This is the equation we were given: Where: SVi is Sensitivity Value of the ith taxon Xi is the density of the ith taxon n is the num…

I wasn't sure were to put this... its not realy homework... but it will better my education so I supose this is a good place... Ok... I dont know much about deers, but this one, well ther is two of them actually this is the smaller one of the two, keep showing up in my back yard... can anyone tell me about it? is it rare or what? <a href="http://photobucket.com" target="_blank"><img src="http://i16.photobucket.com/albums/b20/Saheeta/spotteddeer.jpg" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a> if that picture didn't show up, here is the link to it in my photo bucket... http://i16.photobucket.com/albums/b20/Saheeta…

I need to be able to memorize the phases in Meiosis and Mitosis, I have the names of the phases down I'm just not sure how to memorize what goes on in each step. Any advise?

Hi, does anyone know a good book or site I could refer to for conic section related formula,properties(the whole lot).I will be requiring very detailed covering almost everything esp. focusing on the tangents , normal and other associated figures and their various forms(i.e parametric ,slope,point, etc..). Thanks

Pretty basic and I'm sure for you guys pretty lame, but I am taking a science class that is required for me to get my AA. I am having a real hard time and I'd appreciate some help. Ok, the question: If an object with a mass of 4.0 kg has a velocity of 7.0 m/s, what is the kinetic energy? I have my book and it says the equation for Kinetic energy is: KE = 1/2(mv²) I have to solve in Joules. Now, what I have so far (and probably WAY wrong) is: KE = 1/2(mv²) KE = 1/2(4kg x 49m/s²) KE = 1/2(196N) KE = 98N Now, I don't even know if I did that right -- but on top of that, I have to solve it in Joules and I don't even know where to start for that. I did a …

Enzymes are responsible for both sperm and male sex hormone production in the testicles of human males. Some of these enzymes have an optimal termperature of 33°C, which is about 4°C lower than body temperature. If this termperature is increased or lowered, sperm and testosterone production is adversely effected? b) What anatomical feature helps the testicles to maintain a lower temperature? I'm not sure on what this question means by anatomical feature... the testicles are located below the core of the body? Would that be a sufficient answer?

Hello all, I'm obviously new here. I've got a Physics problem that i need help on. Its really just a converion really. Am working on a mass spectrameter problem and i need to convert the AMU of U235 and U238 to kg in scientific notation (i.e. 0.00x10^-26 kg or something like that). What i have us u235 is 235.043923 and u238 is 238.050783. Thanks!

we've done an experiment iodine reacts with propanone the reaction mixture contains -50 cm3 of 0.02 M I2 in aqueous KI solution -25 cm3 of H2SO4 -6.25cm3 of propanone -18.75am3 of distilled H2O while other groups used different volume of propanone and water but the total volume of reaction mixture is still 100cm3 and after mixing... After 5 minutes, pipette 10.00 cm3 of the reaction mixture into another conical flask containing 10 cm3 of the sodium hydrogencarbonate solution (measure this during the 5 minutes interval) noting the time at which this is done. Mix the solution thoroughly and then titrate with the diluted sodium thiosulphate solution using sta…

I'm looking for web site other than Wikipedia and howstuffworks at a elementary level not high school level .The problem with Wikipedia and howstuffworks is it is at a adult level . I need web site at elementary level that walks their grade 2 to 8 on biology ,electricity ,space rockets ,computers , medicine:eek: I'm try to learn and understand. With pictures ,illustrations and simple english.

Hi, I am not a physics student so i am struglling with this bit; a phase angle corresponds to how many wavelength? say i have the phase angle of 3Pi/2 how many wavelengths would it be? is there a formula for this ? any help appreciated!

hi, i just wanted to confirm that in the formula that relates KE with root mean square speed; KE= 1/2 mc^2 m is the mass of something rather than the molar mass? Say we have He(helium) which has the molar mass of 0.004 Kg/mol while its mass,m, is 4!. Slightly confused because in the root mean square speed formula I use the molar mass, M. c = (3RT/M)^1/2 thanx in advance for any help!

guys i have a question for you... explain whta characteristics we exploit to distinguish between gram positive and gram negative bacteria. pls help me with the answer

Hi guys I have a big problem and I would be grateful if someone could help me, Thanks in advance How would I work out the concentration of hydrogen ions in, for example, 2 mol dm-3 solution of sulphuric acid.

i tried to solve it [math] \lim _{x->0} \frac{cos(xe^x)-cos(xe^{-x})}{x^3}\\ [/math] [math] e^x=1+x+O(x^2)\\ [/math] [math] e^{-x}=1-x+O(x^2)\\ [/math] [math] xe^x=x+x^2+O(x^2) [/math] [math] xe^{-x}=x-x^2+O(x^2) [/math] [math] cos(x)=1-\frac{1}{2!}x^2+O(x^3)\\ [/math] [math] \lim_{x->0} \frac{1-\frac{1}{2!}(x+x^2+O(x^2))^2+O(x^3)-1+\frac{1}{2!}(x-x^2+O(x^2))^2+O(x^3)}{x^3}=\\ [/math] [math] =\lim_{x->0} \frac{1-\frac{1}{2!}(x^2+O(x^2))+O(x^3)-1+\frac{1}{2!}(x^2+O(x^2))+O(x^3)}{x^3}=0\\ [/math] the answer is 1/2 why i got 0??

i don't under stand how the heck the glass atoms don't brake apart (the glass wen u melt it so it gets so hot it melts and u stretch it in to a thin wire )

Start by reading Experiment 1 and then use your knowledge and understanding of the processes of photosynthesis and respiration and the properties of enzymes as biological catalysts to write the interpretation of the results for Experiments 2, 3 and 4 which follow. For each experiment your answer should be less than 200 words. Experiment 1 Method A fixed quantity of Elodea canadensis is placed underneath an inverted water filled funnel at 20 °C in a beaker of pond water. A bright light is shone on the beaker. After a few hours a collection of gas is apparent in the test tube as the water it contained is displaced. The experiment is left to run for a specific time (6 …

in a question i came across, it asked why sodium hydrogencarbonate precipitates at a certain temperature ( i think it was room temperature) and i really have no clue! someone please help, or refer me to somewhere with some information! thankyouuu!

Ok, I know, because my book says so lol, that a Triflouromethly (CF3) group is "meta directing" in electrophilic aromatic substitution...but I don't know WHY If anyone could help me out, that would be great... And its supposed to be "deactivating" right? and not "activating"? Or do I have this mixed up? I would actually like to learn this for future reference, so info is greatly appreciated, even if its not directly linked to this question Thanks for the help!

guys i have one question for you... E coli grows in neutral environment.what do you think that will happen to these bacteria if the ph of the growth medium is not neutral? exlain your answer. pls help me