Homework Help

Although not strictly homework, the question I think is basic enough for this sub-forum if thats ok thanks, despite my complete ignorance of subject. Set up. A sealed/insulated volume of 25 cubic litres of air, at 1 atmosphere pressure, preheated to a temperature of roughly 2300C (two thousand three hundred). Heres the question please. If 3cc/mil room temperature fresh water is added to the volume of air, with the intention of converting the water to steam at presumably 2300C, once the conversion is completed by how much in centigrade with the overall temperature of the air/steam volume fall? Put another way... Given the setup, what will be the f…

Im sure this is a simple calculation but ! An object weighing 300 kg is dropped off a ledge 6 m high ! how fast would it be travelling when it hits the ground ? i realize weight at this point is not too much of a issue but when i get an answer to this , i weight will be for my next question! Thanks in advance !

Has anyone been able to induce beating in h9c2 cells?? Any help would be greatly appreciated!!!!

Hi, everyone. I am currently busy with an assignment at school. Am doing these questions tomorrow in school so if you can help in any way i really would be great full. Show what happens when: (1) ---> An alpha particle is given off by plutonium-239 (2) ---> A beta particle is given off by iodine-131 Suppose that carbon-14 makes up 8% of the carbon in living plants and that the half-life of Carbon is 5700 years. ---> How long will it take for the % of Carbon-14 to fall from 8% to 4% ---> How old is a specimen that has 1% carbon-14 Any help would be greatly appreciated! Thanks in advance.

Why isn't time considered another dimension of space?

ok, it's said The Quadratic Equation f(x) = 3x^2 - 6x + 11 can be expressed in the form f(x) = 3(x - h)^2 + k. Find the value of h and of k f(x) = 3x^2 - 6x + 11 i use the completing the square method to convert it into vertex form = 3x^2 - 6x + (6/2)^2 + 11 - (6/2)^2 = 3x^2 - 6x + 9 + 2 at this part start to puzzle me, what should i do with 3, which is a = 3 this number appear to be the same at ax^2 + bx + c = a(x - h) + k then, should i remove the 3 from the factorisation? which mean x^2 - 6x +9 +2 = (x - 3)^2 + 2 and then put a to the equation? 3(x - 3)^2 + 2? so, that when i check again, 3(x-3)(x-3) +2 = 3x^2 - 1…

Is an intercept where the graph meets or crosses the axis? For example, in the function, f(x)=x^2(x-4), is the point (0,0) an x-intercept? PS- I put this in this forum because I thought it fit best here. I already asked my teacher, but wanted another opinion, as I found conflicting info online. Thanks in advance!

For my final trigonometry project I have to build a car out a vegetables. I want it to look like Cinderella's carriage. I know how I want to build the body, but with the wheels, I'm having a problem. I want to use radishes as wheels, but that can change if it has to. the radishes will not stay on the toothpicks. (I have to use all natural materials that aren't processed. Yes, I know that toothpicks technically are, but I'm only going with what my teacher has said.) Carrots will even slide off. Help?!

how to factor 3x2 -6x + 9 = 0 i don't know how to facor help please

Let f(x - 2) = x^2 + 2 Find f(3) Do I just sub 3 for x and get f(1) = 11? or do I do it this way: x - 2 = 3 x = 5 , therefore f(5) = (5)^2 + 2 = 27? or just let x = 5, then f(5 - 2) = f(3) = 5^2 + 2 = 27?

Hi Can anyone help me out with Ciguatoxins? (A) What kind of functional groups are present? I came up with methyl, ether, alcohol and alkene is this correct? (B) How many chiral bonds are present? I got 2 but some how think im not right .... © How many moles of Bromine would react with 1 mole of this compound? I got 4 (d) What is the R,S assignment to the four sterogenic centres in the sub-section of the Ciguatoxin molecule? This I have no IDEA.. Ta

Can any one help with hints, suggestions idead?? Im lost ;-( (a) Provide the equilibrium constant expression (Kc) for the following reactions (i) 2 NO2(g) + 7 H2(g) -------------> 2 NH3(g) + 4 H2O(l) Kc = (ii) 4 FeS2(s) + 10 O2(g) ------------------->2 Fe2O3(s) + 8 SO2(g) Kc = (iii) H2O(g)+ C(s) ------------------------->H2 (g)+ CO(g) Kc = (b) Consider the reaction of hydrogen with sulfur to produce hydrogen sulfide. CO(g) + H2O(g) 2 CO2(g) + H2(g) At equilibrium (at 5500°C) the concentrations of each gas are: [H2] = 0.200 mol L 1, [CO] = 0.180 mol L 1 , [CO2] = 0.150 mol L 1 and [H2O] = 0.0.0411 mol L 1. Calculate t…

Can any one help with a few questions... In 1789 Antoine Lavoisier did a series of reactions where he oxidised tin to tin-calx (SnO2). Lavoisier found that 1 kg of air always reacted with 0.78 kg of tin to yield 0.99 kg of tin-calx and leave 0.79 kg of gas inerts. (a) Write a balanced equation for this reaction (including state symbols). (b) Did Lavoisier measure things correctly? Does 1 kg of air react with 0.78 kg of tin yield 0.99 kg of tin calx? (Show your working to confirm your decision). © Calculate the enthalpy change for the reaction of tin with oxygen. Given the following information, SnO2(s): ΔfHº = -580.7 kJ mol-1 and Sº = 52.3 …

a ball is struck while traveling 50mph. It's launch angle is 30 deg. Using constant for g= 32ft/s/s calculate the distance the ball traveled. I have the answer. It's 316 ft, according to my professor. What I don't understand is this: When converting 50mph to ft/s you multiply by 1.467. Then in the equation you square that number and divide by g (32). BUT he squared 1.467 FIRST, then multiplied by 50. which gives a different answer than if you convert to ft/s first and THEN square. The formula I'm using reads like this R= Vi2sin(2θ) g R= (Velocity initial)2 times the sine of (2*the angle of launch (or theta)) --------…

What is the number of integral values of k for which the equation 7cosx+5sinx=2k+1 has a solution ? The answer in my book is:8

MSUD is a rare inborn error in metabolism ..affected individuals cannot completely degrade AA Leucine,isoleucine, valine due to lack of activity of certain degradative enzymes..accumulated degradative enzymes, keto acids are excreted in urine and sweat autosomal recessive trait. This is practice work Question 1 MSUD allele affects phenotype by altering a) The enzyme responsible for degrading valien isolecuine and lecuin**i thought this was the answer..does not make sense why is this incorrect? b) but the answer is none of the above. Question 2 which is true a)nucleotide sequence for MSUD allele is different then the nucleotide sequence for normal allele…

can you please help in in the following questions plz Please attach list of references at end of assignment. 1. Read through the following account of kidney function, then write on the dotted lines the most appropriate word or words to complete the account. In the kidney, the renal artery branches to form many smaller arterioles, each of which divides further to form a knot of capillaries called a ............................................... Here, small molecules such as..................................and ................................................are forced into …

State how many chromosomes and chromatid are found...is this correct? spermatogenesis --------------------------------------… Primordial germ cells- 2n =46 chromosomes and 46 chromatid..because chromosomes have not yet entered s phase? spermatogonial stem cells- still 46 chromatid and 46 chromosomes primary spermatocyte- s phase has occured so 46 chromosome and 92 chromatid? --------------------------------------… oogenesis primordial germ cell= 46 chromosomes 46 chromatid oogonia- s phase has not occured?- 46 chromosomes and 46 chromatid primary oocyte- s phase has occured so 46 chromatid and 92 chromatid? ootid and the polar bodies are each haploid with 23 ch…

the question is, Solve the equation [math]2^{x+2} - 2^{x-1} = 28[/math] so, I do the calculation... [math]2^{x+2} - 2^{x-1} = 28[/math] [math]2^{x+2+1} - 2^{x-1+1} = 28 * 2[/math] [math]2^{x+3} - 2^x = 56[/math] [math]2^{x+3} = 2^x + 56[/math] [math]2^x * 8 = 2^x + 56[/math] [math]2^x = \frac{2^x + 56}{8}[/math] [math]2^x = \frac{2^x}{8} + 7[/math] [math]2^x = 2^{x-3} + 7[/math] now i'm stucked, i solve it, but does it's can only be done by wild guess, like this.. let x = 3 [math]2^3 = 2^{3-3} + 7[/math] [math]2^3 = 2^0 + 7[/math] [math]2^3 = 8[/math] x = 3 # or there any alternative calculation for this?

We're currently on the Equilibrium unit, and I'm having problems with some questions. 1) Given a 0.015 M solution of HOCN with a pH of 2.4, find the ionization constant, Ka. I know that ka = ([H+] [OCN])/ [HOCN], and i can calculate for the concentration of H+ and HOCN. But how do we find the concentration of OCN>? 2) Given a 0.015M solution of an unknown base with pH10, find: a) The concentrations of hydroxide and hydronium ion b) Kb I think for part a) I use the -log[H+] = 10 to find the concentration of H+. But then what about hydroxide? And as for b), Kb = Kw / Ka, but since we don't know Ka, how do we solve for this? Sorry if it's a …

In one of my solution-guides, they're trying to solve an integral of this form (to later get the root mean square velocity): [math]<v^2>= A \int v^4 \exp{\frac{-Mv^2}{2\tau}}dv[/math] I was thinking of doing this by integration by parts, and trying to reach a gaussian integral or something like that, but I totally miserably failed; it became really complicated. The book solves it by u-substitution, only I don't quite get what they're doing there. They're saying first (and this I understand) that [math]u=\frac{Mv^2}{2\tau}[/math] But then they simply state that [math]v^4 dv=\frac{1}{2}\left( 2\tau/M \right)^{5/2} u^{3/2} du[/math] .... h…

Ok, we've warmed up enough! Now for the real thing: Let [math](G,\cdot,T)[/math] and [math](H,\ast,S)[/math] be topological groups, [math]H[/math] being connected as a topological space, and let [math]f : G \rightarrow H: g \rightarrow f(g)[/math] be a homomorphism of topological groups, i.e.: [math]f : G \rightarrow H :[/math] Continuous, and: [math]f(g_1\cdot g_2)= f(g_1) \ast f(g_2)[/math] (or [math]f(g_1 g_2) = f(g_1) f(g_2)[/math], in simplified notation) [math]\forall g_1, g_2 \in G[/math]. Suppose moreover that [math]int_{S}f(G) \equiv f(G)^{\circ} \neq \emptyset[/math], i.e.: [math]\exists \, g \in G, U \in S[/math] such that: [math]f(g) \in U \subseteq f(G)…

Hey guys, I'm studying for my thermo exam, and I have this homework problem: Okay, so here's what I did: Electrons have 2 possible spins, so my usual "n" would be doubled in occupancy, hence N=2n. And: [math]\epsilon=\frac{\hbar^2\pi^2 n^2}{2m L^2}=\frac{\hbar^2\pi^2 N^2}{8m L^2}[/math] And solving for N, gives me [math]N=\frac{2 \sqrt{2m \epsilon}L}{\pi \hbar}[/math] The energy of the highest filled orbital in the ground state of a free particle gas of fermions of spin 1/2 is [math]\epsilon_F=\frac{\hbar^2}{2M}\left( \frac{3\pi^2N}{V} \right)^{2/3}[/math] And the density of orbitals at [math]\epsilon_F[/math] is [math]D(\epsilon_F)=\…

the Question say, Find the range of value of p for which the straight line [math]y = 2x + p[/math] does not intersect the curve [math]x^2 + y^2 = 20 [/math] so, i dun have any idea how to start.. the textbook don't tell me anything.. so, help anyone?

I just want to know the basics of how the alleles that make up the genotype of a child at each locus are derived from his or her parents’ genotypes. I really need some help with this, I'm totally stuck, If anyone could help i'd really appreciate it.