Homework Help

Good afternoon! My daughter did this years science fair experiment on how temprature effects borax crystal growth. Her hypothesis was that colder conditions would grow crystals faster than warmer condidtions. By the time she got to recroding her findings she seemed to have shifted and was recording the size of the crystals (which one was larger) rather than which one formed first (which she does have that information, just not in great detail). I say all this to give just a little background. So, she was chosen to move on to the regional science fair (got 3rd place at her school) and she was told that she can use the judges/teacher comments to make chang…

Hello guys, I need this help as big big one... Extremely Important for tomorrow. I have hard understanding good English so someone please help me. This is the website, please read and answer the question... http://science.time.com/2013/01/08/big-brains-what-you-and-some-guppies-have-in-common/?iid=sci-main-lead What was the purpose of the research? What were they trying to find out eg question or hypothesis How did they test their question or hypothesis eg. Experiment What were their conclusion and what did they find out Briefly defend your speech was it important or waste of time? Thanks alot

Hi everyone, I've been working on this problem for a few hours and am finally looking to get some help. Considering the decay chain for U-238. For an initial activity of 1 Bq, how many Bq of U-234 exist at 10,000 years? I know (U-238 -> Th-234 -> Pa-234 -> U-234) NTh234 = (KU238/KTh234-KU238) * N0U238 (e^(-KU238*t)-e^(-KTh234*t) + N0Th234e^(-KTh234*T) NPa234 = (KTh234/KPa234 * KTh234) * N0Th234 (e^(-KTh234*t) - e^(-KPa234*t)) + N0Pa234*e^(-KPa234*T) NU234 = (KPa234/KU234-KPa234)*N0Pa234(e^(-KPa234*T) - e^(-KU234*t)) + N0U234e^(-KU234*t) K = Decay Constant T = time (10,000 years) I have the half life, and decay constant,…

Hello I was cusrios to find out whether an objects velocity can be zero at the same instant that its acceleration is not zero. I am not confident about my answer which was pretty much a no and I gave an example about throwing ball in the air. I was also not sure about a a question that said: if an object has a greater speed, does it necessarily have a greter acceleration. I answered yes and gave an example of a car but I am not confident of my answer. I would really appreciate the help. Thank you

The question states: a Pyrex plate is filled to the brim with liquid pumpkin pie filling, then baked at 190 degrees Celsius. The pie plate is h=3.60 cm deep, but the sides of the dish taper from the top to bottom so that the bottom is a circle of diameter d2=25.8cm, while the top opening is a Circe diameter d1=27.4cm. The filling is prepared at 20 degrees Celsius, but when it is baked it expands and .236 L of it flows over the edge of the pie pan and ends up in the bottom of the oven. Compute the thermal expansion for the volume of the pie plate itself, and then use the overflow amount for the filling to get an estimate for the thermal expansion coefficient (alpha …

Please see the attached file of the graph. I really need to find out the Km and Vmax. Any help will be greatly appreciated

Anyone please help me fast I can win something Even if you know some , please help me I have answers for few , so please help Questions are :- 1) Do your best to explain to me what Nothing is. 2) Due to who's proposal that the Earth is hollow did Jules Verne write his classic Journey to the Center of the Earth? 3) Why is the Earths magnetic field tilted? And to which cardinal direction is it tilted toward these days? 4) What is XNA? Name me at least one back-bone of XNA that is used. 5) How does the Tiger get its stripes? 6) Name me one organism that feeds on radiation. 7) In which period of Earths history are the earliest records of terrestrial animal l…

Hiya, Asking this for a friend, retired engineer, big IQ and so forth. He subscribes to Scientific American, is interested in the genetics-related articles. But he says his biology education pretty much ended with high school in the early 'sixties, and he needs the ground-up info to understand those articles. (If you remember the 'sixties, no, I am not referring to planaria!) He further says he can't locate this info. Everything he reads seems to assume everyone already knows the relationships among DNA, chromosomes, genes, and cells, for instance. I arrived at this forum by googling "is a strand of DNA the same as a chromosome?" And, having arrived, I a…

All Questions are shown on pictures. My Calculated answers: A1(a) R= 19.21∠68.7o N (b) E = 19.21∠-111.34o N or = -19.21∠68.7o N <--- Is't either one answer is correct or not? If not, which answer is correct and why? Thanks. A2(b) I = 0.5mr2 = 1.125kgm2 A2(a) k=(I/m)1/2 = 0.212m A2© αt=ω, α = 3.14 rad/s2 A2(d) T=Iα = 3.53Nm I can't gain the answer of A2(a) first. I use the A2(b) answer to help me to gain the A2(a) answer. So, the step of my calculated order is A2(b) -> A2(a) -> A2© -> A2(d). Is't correct? B1(a)(ii) RBY = 1500N sum of force and moment = 0 RA = 1200N (toward left) RBX = 1200N (toward right) B1(b) RBY = 500N…

Question no. 1.140

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Please help me out with my English class project and take my quick survey: http://www.surveymonkey.com/s/DDMFR9S I need at least 100 results Thank you

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This is for a side project I'm doing, not exactly school related. I'd just like to see your opinions on these statements. Mostly out of curiosity. Just wondering what you think. Do you think these are true or false statements? 1. Science itself cannot be studied in the same way science investigates other groups and cultures. 2. Science has always valued experimentalism and and investigations of all kinds. 3. The value of empiricism has decreased over time and this is a benefit to human society. 4. Skepticism is the key to what makes modern science work. 5. Science is just organized common sense. 6. The public understanding of how science is performed and spe…

The following measurements are recorded during a test run. Time taken to raise lift = 80s Current in motor = 6.25 A Voltage applied to motor = 240.0 V Mass of lift = 120 kg Height lift raised = 40m A) Calculate the energy needed to raise the lift B) Calculate the gain in potential energy of the lift after it has been raised C) Account for the difference between the values in (a) and (b)

Been stuck on this question: show g is homogeneous of degree k and state the value of k. [latex]g(x, y)= x^3 +3xy^2/ \sqrt[3]{x^2-y^2}[/latex] So i've been trying to use: [latex]kg(x,y)=x\dfrac{\delta g}{\delta x}+y\dfrac{\delta g}{\delta y}[/latex] but i just can't seem to get a solution for k. Am i going about this the right way? I think i'm missing something obvious. Does anyone know of anywhere with worked examples of these types of questions? Thanks for any help.

Im doing a physics presentation in school in january and its on designer materials. i can think of any, can anyone help? Please.

Greetings everybody. I'm in desperate need of some help. It is not exactly a logical question but I guess i'm looking for a logical answer from somebody more scientific than me. I wonder if it's possible for the earth to stop rotating, thus leaving half the world in permanent darkness and half the world in sunlight? Thanking you in advance for any help xxxxxxxxxxxxxx I should of added: I am talking in a million years. When pigs fly. So if the world didn't spin, would that mean we wouldn't have day and night? Xxx

Hello everyone I have posted this question 3 days ago in organic chemistry department....NO REPLY TILL NOW So,,people in here. ..please some help in the following question.... Can an imide ring (for example succinimide) forms a shiff base with an amine?? i know that a ketone carbonyle group can form a shiff base with an amine but the carbonyle of the imide ring can or not?????i dont know??? WAITING FOR YOUR KIND HELP

Hi, Im in Grade 11 Chemistry and I have a question. That I do not understand. 500g of copper metal is reacted with 2.5L of 3.0 mol/L nitric acid solution. Calculate how much of the copper metal remains after the reaction is complete. I tried some ways but I still do not get the answer, I am looking for. The answer is 320g of copper left unreacted. Thank you, KB

Hi there might be being a bit thick, but the sun emits UV which passes through our atmosphere some gets redirected the rest is absorbed by the earth and IR is given out which is the cause for global warming in a nutshell. I realise that UV and IR have different wave lengths but UV like IR is reflected by the clouds wouldn't this cause exactly the same effect with the greenhouse gasses storing the heat ? I mean UV causes sun burn so wouldn't it be the same case for the atmosphere ? I'm aware that the carbon cycle and water cycle play a large role in the whole global warming thing and from the book I'm studying water vapor has a lot more to do with global warmi…

What would happen to the concentration of weak acid HA if we add another kind of weak acid let say HB to its solution ?

Hi folks, thanks for looking at this. I've tried doing this and revisiting it to look for some fresh thoughts but can't seem to figure out how to use the suvat equations to determine the deviation from the centre of the target. A gun is aimed so that it points directly at the centre of a target 200m away. If the bullet travels at 200m/s how far below the centre of the target will the bullet hit? My aim is to determine the angle of the trajectory by using suvat for horizontal motion i.e. s = v*cosTHETA*t, but given v, I still have to contend with s, cosTHETA and t. I was thinking of using simultaneous equations with displacement and distance, however, I cannot figur…

100g of CO are contained in a weighted piston-cylinder device. Initially, the CO is at 1000kPa and 200oC. It is then heated until 500oC. Determine the final volume of the CO treating it as an ideal gas. This is what my lecturer gave in his solution: V2=(mRT2)/P=(0.1kg*0.2968kPa.m3/kg.K*(500+273)K)/1000kPA My question is: why is the original pressure (1000kPa) been used instead of the final pressure? Thanks for your help.

Hi there everybody! I'm having trouble with this hw my teacher gave and i'd like you to help me as it's been quite difficult to find anything with Google. I'm supposed to get information about Green, Stokes and Gauss' theorems on: How could you relate them (at least in pairs) and some applications they have. I know that if my surface is plane and parallel to the coordinate axes Stokes = Greens. Another thing I've already got is that Green applied to a 1 is the curve-length , Stokes would give the surface and Gauss the volume, correct me if i'm wrong. So i'd basically be needing some real applications like in physics or any other field where it is used. Thank …