Homework Help

what would happen to red shifts if the universe was static. it would be much appreciated. thank you

Hi, there's a question that's really annoying me. I hope you guys could help me with it! It is observed that Mars is somewhat brighter when in opposition (ie. sun- earth - mars in that order) that at other times. How can this be explained using a) The Ptolemaic model and b) The Copernican model of the solar system. (Assume that Ptolomy's construction describes the actual motion of the planet) Well, for the first part: the rays of the sun shine on mars, whereas if mars was on the other side, u wouldn't be able to see it since the sun would be blocking the way. For part b, mars would be the shortest distance away from the sun in that position; therefore,…

Hey all... Got this math problem. I've attached a the problem below and what I think the question looks like below. Other than that, I'm lost.

"a science group put in a satellite of mass 'm' into a circular orbit of radius 'r'. the orbital velocity it needs to remain in this orbit is 'v'. they now put another satellite into a similiar orbit at the same altitude. its mass is 3 times 'm'. what orbital velocity would it need to be given? give reasons why using mathematical reasoning". ok i have tried this and have come up with an answer but im not sure i am right. since it is orbiting i used the equation v^2=Gm/r which is from the fusion of the centripedal and gravitational equations. using this equation 'm' is the mass of the earth as the mass of the satellite is cancelled out, thus i think that the mass wou…

Can anyone help me with this question? Which is the active chlorinating species in aromatic chlorination reactions using chlorine in the presence of aluminium chloride? AlCl4+ Cl- AlCl4- Cl+ HCl

Umm I got this question but dont really know what to do with it. ==> Astronauts in a space capsule orbiting the earth at a height of 900km experience weightlessness: hence the gravitational field due to the earth must be zero at that altitude. It says to include calculations in my answer but i dont know what calculations would be involved. i'm guessing that the statement is wrong and must be proved so by using calculations. can u help me?

Hey i am not sure what they mean in question (a) for this problem....and consequently i don't know how to do it :S -Sarah although i think i can do part (b), for which i get: [math] M = - \frac{LN}{f_of_e} [/math]

hey, Examine the truth of the statement: "the moon moves in a near circular orbit around earth. Because the arth is so much more massive, its own motion is not appreciably affected by the mons prescence." i am reeaallllly stuck on this and am really lost on what exactly i have to do can anyone please help me out please!!!!!

Hey just a small easy (i think/hope) question... have never done one of these types of questions before, so just thought i'd see how i'm doing ok here goes... [math] T = m_0c^2[\gamma - 1] [/math] [math] u_0 = rest \ energy = m_0c^2 [/math] now [math] u_0 = 938 MeV = 1.502676\times10^{-10} J [/math] [math] E = 1400 MeV = 2.2428\times10^{-10} J [/math] [math] m_0 = \frac{u_0}{c^2} = 1.66964\times10^{-27} kg [/math] [math] E = T + u_0 [/math] so [math] T = E - u_0 = 462 MeV = 7.40124\times10^{-11} J [/math] Now solving [math] T = m_0c^2[\gamma - 1] [/math] we get [math] 1-\frac{v^2}{c^2} = 0.67 [/math] [math]…

hello people my first time here and im hoping ill be getting some help on this one. I need to know how MP3 players work...by that i mean how the sound comes to the earpiece, light for IPODS,etc....and if there are other science principles used...plz mention tht as well... thnx in advance

How to solve the following boolean algbera? Please provide explaination... Thank you... x = A'B + CD + AD'

is this a 'proof' for this question? [math] h(x) = \sqrt(3 + x) [/math] we want to find a K > 0 such that [math] |h(x) - h(y)| \leq K|x-y| \ \ \forall x,y \in [0,1] [/math] that is we want a K > 0 such that [math] |\sqrt(3 + x) - \sqrt(3 + y))| \leq K|x-y| \forall x,y \in [0,1] [/math] now [math] |\sqrt(3 + x) - \sqrt(3 + y)| = \frac{|(\sqrt(3 + x) - \sqrt(3 + y))(\sqrt(3 + x) + \sqrt(3 + y)|}{|\sqrt(3 + x) + \sqrt(3 + y)|} [/math] [math] =\frac{|(3 + x) - (3+y)|}{|\sqrt(3 + x) + \sqrt(3 + y)|}=\frac{|x-y|}{|\sqrt(3 + x) + \sqrt(3 + y)|} [/math] So, we want: [math] \frac{|x-y|}{|\sqrt(3 + x) + \sqrt(3 + y)|} \leq K|x-y| [/math] …

is this a 'proof' for this question? [math] h(x) = \sqrt(3 + x) [/math] we want to find a K > 0 such that [math] |h(x) - h(y)| \leq K|x-y| \forall x,y \in [0,1] [/math] that is we want a K > 0 such that [math] |\sqrt(3 + x) - \sqrt(3 + y)| \leq K|x-y| \forall x,y \in [0,1] [/math] now [math] |\sqrt(3 + x) - \sqrt(3 + y)| [/math] [math] = frac{|(\sqrt(3 + x) - \sqrt(3 + y))(\sqrt(3 + x) - \sqrt(3 + y)|}{1} [/math]

The following shows two stages in which the raw materials, zinc blende, ZnS, is converted to the metal zinc. 2ZnS (s) + 3O2 (g) --> 2ZnO (s) + 2SO2 (g) ZnO (s) +C (s) --> Zn (l) + CO (g) 194g of znc blend is used for this extraction process. The mass of zinc recovered from it is 125g. Write the overall reaction equation, with state symbols of this extraction process. --- 11.1 g of calcim chloride is added to 100cm3 of water. Calculate its concentration in a) g/dm3 and b) mol/dm3. The thing i want to ask is : Concentration (g/dm3) = Mass of solute (g) / Volume of solution in dm3 Therefore, do we use the volume of water only or use the…

i need help with my calculator i cant find the functions ; nPr or nCr anywhere. i have an HP 39g+ graphing calculator i tried consulting the manual,but i couldnt find anything on it. help is greatly appreciated

can anyone help with these questions?! woudl really appreciate it , finding them impossible! a linear transformation T: R^6 --> R^6 is known to have characteristic polynomial x^2 (x + 1) (x+5)^3 determine all possibilities for the mimimum polynomial of T Let V be and inner product space over C (complex) with inner product space <,> and let u,v, be vectors from V which are orthogonal to each other . prove that ||au+bV||^2 = |a|^2 ||u||^2 + |b|^2 ||v||^2 for any complex numbers a and b. thank you!!!!

ok here is question and my answers...: [math] \lambda=2L=2\times0.580m=1.16m [/math] [math] \mu=\frac{M}{L_(wire)}=\frac{0.00225kg}{1.00m}=0.00225(kg/m) [/math] [math] v=\sqrt{\frac{F}{\mu}}=\sqrt{\frac{29.4N}{0.00225}}=114.3(m/s) [/math] [math] f=\frac{v}{\lambda}=\frac{114.3(m/s)}{1.16m}=98.54 \ Hz=98.5 \ Hz [/math] how'd i do? -Sarah

just wanted to make sure i am doing this correctly.... ok my answers are: (1) [math] \lambda_n=\frac{2L}{n}, \ n=1,2,3,... [/math] (2) [math] v=\sqrt{\frac{F}{\mu}} [/math] [math] \mu=\frac{M}{L} \ \ \ \ (mass \ per \ unit \ length) [/math] [math] f=\frac{v}{\lambda}=\frac{n\sqrt(\frac{F}{\mu})}{2L}=\frac{n\sqrt(F)}{2L\sqrt(\mu)} [/math] ok yep thats it (hopefully the latex stuff works, i cannot see it on my computer at the moment, so just tell me if it shows up incorrectly (or not at all) ) Cheers Sarah

Say you want to start a "National Bank". Thus you will need a piece of paper that is like a license to start a bank. What is that paper called? And what is the name of the government agency that you would get that paper from?

What is the difference between a hypothesis and a prediction?

hey i just wanted to check if i was going the right way about doing this question i am not sure whether, after what i have already done here, i should then use the radiation equation (the rate at which any object radiates heat) anyway, here is the problem and my answer

I have made calculations with other students and would like to get an "absolute sure answer". We are all not really sure about our answer as they all differ. An adult needs 12mg of zinc per day. An average oyster contains 200 ppm of zinc. How many oysters are required to fulfill the daily intake of zinc for an adult? Respond if you’re absolute sure. Thanks!

Please read the attachments. Thanks, dudes. The teacher just started on this topic, and I am still very unfamiliar with the chapter.

My textbook states that I can deduce the type of acid used to make a salt by analysing its negative ions. Calcium Chloride - CaCl2-----Ca-base ion Cl2-acid ion so you know that by CaO + HCL --> CaCl2 + H2O Then I saw the following: Ammonium sulphate - (NH4)2 S04-----(NH4)-base ion SO4-acid ion 2NH3 + H2O + H2SO4 --> (NH4)2 SO4 +H2O Um...is the 2NH3 dissolved in H2O to give NH3 (aq) [aqueous ammonia] and then added to H2SO4 for neutralisation? I mean, the 2NH3 + H2O is actually mere dissolving but not neutralisation, right? Sorry, guys, I don't know how to write subscripts on the forum....so it is rather hard to see what I am writing.…