Homework Help

I am stuck on this thermodynamics problem. I have the first and third Temperature which I found in a thermo table (62.91 C and 26.72 C). State 2 and State 4 are 2-phase so I don't know how to find the temperature. Would the temperature be the same as given pressure? And how do I calculate density? The gas is non-ideal so I can't use p = rho RT or can I? To find mass flow rate of turbine. I used W_dot = m_dot (h1-h2) and I know W_dot = 10 kW, h1 and h2 are on table. Need help with the two questions below as well, especially c b. What is the compressor work in this cycle? c. Explain simply why the work required by the compressor is so small relative to the o…

In the example , i suspect the selected A (area) is wrong... From the notes , A' is the area of top (or bottom ) portion of the member cross sectional area . But , in the example , we could see that the selected area is located to the right of the point where shear stress is calculated , is the notes wrong ? IMO , the selected A' should look like this , right ? (refer to green part in the 3rd photo )

The full question is: "What is the mass of 9.01 x 103 mole carbon tetrafluroide, CF4(g)?" Any help on explaining how to get the answer to this is much appreciated.

I have a test soon, and I was reading up on the different types of bonding. But, there are somethings that I don't get with the electronic current. Firstly when an ionic compound is a liquid or aqueous, then you can place electrodes and the ions of different charges would move to the electrodes of the opposite charges. I get all of that. But, then how would the current pass through the water if the positive charged electrons are attracted to the negative electrodes. Also, I am a bit confused about metallic bonding and graphite/graphene. If there is a sea of delocalised electrons, then won't the electrons in the current get repelled by the electrons in the metal? …

In my book , it's stated that the at the boundary , the shear stress in beam = 0 . However , wheni tried the circled equation , i didnt get shear stress = 0 . What;s wrong with it ? Is the concept of at the boundary , the shear stress in beam = 0 . correct ? http://imgur.com/a/k9geD http://imgur.com/a/KKCGR

Person with spinal cord injury after a 30 ft fall exhibits: -Neck pain -Inability to move any extremities -can raise shoulders -No perception of sensory stimuli below the clavicle -Some lateral sensation on arms, but no sensation on forearms and hands -No triceps or wrist extensor reflexes. Minimal biceps brachii stretch reflexes -Slightly elevated respiratory rate -Pupils equal and reactive to light -Spasms and exaggerated stretch reflexes of the lower extremities From looking at a dermatome map, I think that there was a severing of the spinal cord at the C5 level. Can anybody point out any flaws in this logic? He's able to breath on his own so I'm assumi…

I have an issue on Distributed OS.I'm in a Distributed Operating Systems course.I have an assignment that have to name a specific distributed OS and explain its architecture like processes,communications,naming,synchronizing,thread,etc even faulty and security and also it shouldn't be Amoeba.Please help me

This is what I mean by ionic compounds (the box) I managed to memorize a few, these being OH, NO3, PO4 and CH3COO. However is there any way to help remember more? Thanks.

Let's call a set "Pseudo compact" if it has the property that every closed cover (a cover consisting of closed sets) have a finite subcover. Does "Pseudo Compact" in this case the same as "Anti-Compact" ? Then how can we describe the "Pseudo-Compact" subsets of Real Numbers?

If someone "does" someone else's homework for them, is that necessarily "bad"? If so , in what way is it bad? Couldn't it be good, in the sense that the helped person understands better?

Is there an easy way to figure out how to solve them?

I call it homework help because it's the most applicable to my situation, but in truth, I have an AP Biology class and my professor is difficult to call helpful. Here are a few topics I need to be introduced to: 1a.) The structure of a neuron. What are the fundamental building blocks? If possible, include information on how they interact to form signals. (.Building blocks and concepts.) Potassium, Sodium, The Cell Body, Cell Nuclei, Dendrites, Axon, Synapse, Membrane potential Any information is useful. Thanks guys!

Why does acetone evaporate faster than ethanol yet still has a higher surface tension? I just don't understand. I thought that the surface tension is correlated with the evaporation rate. Also, since acetone does have a higher surface tension than ethanol, does that mean that a drop of acetone has a higher height and smaller width than a drop of ethanol?

Two particles of masses 3 kg and 5 kg are connected by a light inextensible string, of length 4 m, passing over a light smooth peg of negligible radius. The 5 kg mass rests on a smooth horizontal table. The peg is 2.5 m directly above the 5 kg mass. The 3 kg mass is held next to the peg and is allowed to fall vertically a distance 1.5 m before the string becomes taut. does any one know what this question looks like i cant even imagine it

Can anybody solve this equation for x? [math]y=\frac{-ln(1-x)}{\sqrt{1-x^2}}[/math] the best I can do is to rearrange to this: [math]ln\frac{1}{1-x}-y\sqrt{2-2x-(1-x)^2}=0[/math] and then take the roots numerically using the mathway website. Any help is much appreciated!

A particle travels srating with a initial speed u, with uniform acceleration a. Show that the distance travelled during the nth second is u+an-.5a. I tried working this out by putting this information into the formula S=ut+.5at^2 but it did not work

Hey, if I start a titration of Histidine at the pKa of the N-terminus (pH of 9.1) with HCl, where would the first equivalence point be? I was thinking that the 1st equivalence point would be between 9.1 and 6.0 (pI) however mols of buffer would not equal mols of acid until the pka of 6.0 is reached. On the titration curve I must label where this equivalence point is but I have never started a titration at a pka before, can someone please help? thank you!

Let V and W be two (real) vector spaces and T : V → W is a linear transformation. Suppose Z is a subspace of W, namely Z ≤ W. Let T −1 (Z) be the set of all vectors x in V such that T(x) lies in Z. Namely T −1 (Z) = {x in V | T(x) lies in Z.}. Argue that T −1 (Z) is also a subspace of V . I don't know how to prove this correct Could anyone help me Thank you T(V) =W > Z ......

I'm trying to come up with an explanation as to why benzoic acid is insoluble in 5% HCl solution while salicylic acid is soluble in HCl. From what I've read, HCl test is used to check for the presence of basic groups. So I was thinking benzoic acid is insoluble because of the COOH group present. However, salicylic acid also has a COOH group. Is the OH group in the salicylic acid enough to make it act as a base in its reaction with HCl?

Hello all! I am studying for a Biochem exam and am having issues understanding how Koshland's Sequential model accounts for negative homotropic effectors. (aka, substrate binds and next substrate is less likely to bind leading to a higher cooperativity) If someone could please give me some sort of a link to a diagram or simply explain it to me that would be great! Google search is not working to well.

i need help on how to determine the microbial number of non culturable Bacteria.........anyone???

I have a programming assignment in my C++ class that is due tomorrow and I'm pretty much lost. This assignment is actually a little bit ahead of where we are in our studies currently, and is a pretty difficult undertaking (at least for me): Here are the requirements: Develop an algorithm that will take an angle, measured in degrees, between ­-90° and +90° ( ­-90 < x < 90 ) and calculate the sin, cos and tan of the angle, and implement the algorithm in C++. Your program should validate the input for the angle, making sure it falls within the given range and notifying the user if it does not. Your angle and sin, cos, tan and all numbers should b…

Maybe someone of you are advanced in physics. Trying to solve this problem for 8 hours, still no results.

Hi everyone. I'm sure you're all glad I'm back with another chemistry problem giving me problems. You can see below is the attached question. Here is the work I have for it. kb = kw/ka = 1 E-14 / 1.8 E-5 = 5.55 E-10 NaC2H3O2 .151 M HC2H3O2 .082 M C2H3O2- + H2O <--> HC2H3O2 + OH- I .151 .082 0 C -x +x +x E .151-x .082+x x kb = [HC2H3O2][OH-] / [C2H3O2-] 5.55 E-10 = [.082 + x][x] / [.151 - x] Since the kb is so low we can make assumptions and use the 5% rule. 5.55 E-10 = [.082][x] / [.151] x = 1.023 E-9 = [OH-] …

Can someone please simplify the boolean expression below and show it in steps how you done it. Would help me out alot. Thanks (A.B + A.B.C + A.B.C.D + A.B.C.D.E + A.B.C.D.E.F)