Homework Help

Hello there, I am a student studying in th UK, i am 15 years old and recieved news the other week of beig invited to a science masterclass in Iceland. Today i recieved my letter from the organisation that is organising it, amongst this i found that some work had to be submitted to enable me to go iceland on this oppertunity of a lifetime trip. I was given a short article telling me that, "a young boy is confused about reporters saying that global warming is caused by Humans, but he would like to know wether it is created by humans or is it a natural occurance" So in a summary i need the following to be observed: Who do you feel is causing it What has caused it …

Hi everyone, This is my first post on this forum which I stumbled across while searching for physics help on google. Anyway Im going to try to make this short. Im taking grade 12 physics and so far we are doing review and I remember nothing. Om going to post a few questions and hopefully you can give me specific break down on how to do it. Ill give it a shot and post my solution or if Im unable to do it, ill ask for your help. PS I would really appreciate you guys giving me a general way of approachign these questions that makes it easy for me to determine what Im looking for and the shortest way to get there. Well here are the questions 1) A basketball is thrown…

Hey sorry this isn't particualy sciencey, but i need your help. I'm doing my German A level coursework on Einstein and i really need people opinions of him. so please could you let me know what you know about him, your opinion on him, It doesnt have to be just about his scientific side. thank you

Hi I have just conducted a test for fats using gresase spot test at biology class. But I don't quite understand why will the translucent spot (cooking oil) disapear after immersing into organic solvent. The test procedure: 1. Transfer a drop of cooking oil to a filter paper and let it dry in the air for 5 minutes. 2.Hold up the filter paper to light and observe any translucent spot. 3.Immerse the filter paper into an organic solvent. Take it out and let it dry. 4.Examine the filter paper against light again. Note any change in the filterpaper. Use egg white solution and distilled water as controls. thanks in advance.

A planet with an atmosphere entirely consisting of O2 and atomic oxygen, O, is exposed to solar EUV radiation at a wavelength of λ = 80 nm. The O2 does not absorb this radiation but the atomic oxygen is ionized by it with an absorption and ionization cross section of σ = 1x10-18 cm2. The O+ ions rapidly undergo charge exchange with O2 to form O2+ ions, and the only electron and ion loss process is dissociative recombination of the O2+ ions O2+ e→O+O k1 = 1x10-8 cm3 s-1 If the solar flux is 1x10^11 photons cm-2 s-1 at 80 nm, the atomic oxygen scale height is 50 km and the O density is 1.6x10^12 cm-3 at 100 km, calculate the peak electron density of the resulting ionosph…

What are the reasons for why high blood pressure is a health concern?

i need to make a prodct for my project about Aids so i have gathered some hypodermic needles, african flags, gay symbols and that red ribbon but i need some more ideas for what other symbols i could use... anyone got an idea ?

hi , I'm having trouble in describing the difference between being overweight and obese after doing researches. And could you tell me the bad effects of being obese? thanks

Alright everyone? Just found out about this site on google and wondered if anyone can help me out with a stat test for my cswk. I have a set of results that goes a bit like this (this is a sample) Potato 1 8.3cm Shoot: 1.3cm Distance 0mm 5mm 10mm 15mm 20mm 30mm Cell 1 Average 2.8 2.8 4.6 5.4 3.2 …

hello i'm a high school student who is desperate, as usual i have lft my work till the last minute. i need to find out what the terms "multipotent" and "pluripotent" mean. Please help me!

Hi, I am new guy and I have a question that came across in my homework. Can you answer it? 1. In the productioin of beer, the raw material used is barley grains, which contain alarge amount of starch. When barley grains germinate, amylase is produced. The grains are then crushed and mixed with warm water. After several hours, yeast is added to the mixture for fermentation. a) After the crushed grains are mixed with warm water, why is it neccesary to wait for several hours before adding the yeast? Thanks

Well I have just recnetly started year 11 Physics, Biology and Chemistry. And I will turn to peoples help alot, so here is my first question: Volume is a derived quantity. From which fundamental quantity is volume derived? Thanks all

Hi was wondering if someone could help...doing some purification calculations. Ihave been given the specific activity the protein conc (mg/ml) and the volume extract (ml) and I need to work out the total activity and the % recovery of activity. e.g.the crude extract has vol extract of 150, protein conc of 6.4 and specific activity of 1.25 and % recovery is 100. How do I work out the total activity for the following purifications and the % recovery. Please help!! Thanks, barbie x

Can we remove the green color of leave of a green plant by heating the leaf with water(boil it)? I've got a leaf, one side is green in color and the other side is red. When I boil it, I observe the green color disappears gradually. Does this mean that chlorophyll decomposes under boiling?

Hey all i need to get multiple definitions of religion from some different sources for my studies of religion 2 unit class, i was wondering if someone could give me their definition to add to the short list i already have, thanks loads in advance. Tash

I'm doing a research paper about why evolution should be taught in schools, and ID should not. I've got it mostly planned out, and I've written most of my rough draft, and I was wondering if anyone had some good suggestions.

Hi, would anyone be able to give me some help on my biology essay? I have to write 650 words on “ The process of diffusion and its importance in living organisms.” I honestly don’t know where to even start. I’ve described diffusion and then gone on to narrate what happens when an organism has to breathe. I’m doing my A-levels. But I am seriously scraping an E. If it’s possible, would anyone be able to give me a laments version on diffusion? I don’t even know what guidelines I should be following, and what other points I should be branching out on? I’ve looked for information on the internet, on wikipedia and other sites. But everything is just a repeat of itself – …

For my online class I need to survey ten people on their answer to a question I make up about prohibition/legalizing of drugs. Any feedback is apprieciated! A short answer will do. 1. Should cigarette smoking be prohibited, restricted, or kept legal?

I almost feel stupid for asking for help on this one... I know I should be able to get it, but I'm feeling brain dead atm. Does this somehow involve MV=MV ?

Hello All: I am a student taking a Psychology course, and I have been given an internet research assignment. The assignment is as follows: 1. Contradictory definitions for the terms "theory" and "hypothesis" and/or contradictory explanations for the way the terms are used in conjunction with discussions about the scientific method. 2. Contradictory explanations of what is known as "the scientific method" or the process of research using "the scientific method". I am new to science and, although I am taking a science course as well, I could use a push in the right direction in dealing with this question. Can someone here help me figure this out? I really don't…

Hey could any of you guys help me and my groupmates with our science fair project? We are desperate, we need a topic that involves an experiment and not a demonstration, we would really appreaciate it. Thanks in advance to those who reply to our message, and to those who took the time to read it.

Mr Lam borrowed $3M from a bank to purchase an apartment. The bank offered him an interest rate of 4% and a payment period of 15 years. The monthly payment is $22191. Would you like to give me a calculator to find out whether the actual total payment? I wonder if it is = 22191*12*15

Could you please go to http://SciProj.yes2.us and participate in an experiment for my science project? Once there, you will click on a link to watch a 2-1/2 minute video. Then your browser will redirect you to a page with some questions for you to answer. After you participate, please do not post on this topic about the purpose or content of my experiment, as it will invalidate the results. Thank you! Matthew Rongey

I'm learning about nicotine, tobacco, etc but my assignments cannot be found in my book. I'll put my "guess" below every question because I did attempt every one of them. 1. The lungs' air sacs are destroyed, making breathing extremely difficult, in the condition called A. emphysema B. coronary heart disease C. chronic bronchitis D. lung cancer My guess: Emphysema.. But emphysema has to do with alveoli so I'm not sure. 2. Nicotine contributes to plaque buildup in blood vessels, increasing the chance of A. lung cancer B. diabetes C. hardening of the arteries D. oral cancer My guess: Increasing of blood vessels is caused by nicotine, whi…

As periodate may cut glucose into formic acids, how many cuts take place on a ring structure of glucose, and how many on the linear form of glucose? thank u for ur help!