Homework Help

#1 During heavy exercise 2.0 liters of blood are pumped to the surface of a person per minute to carry away core heat. If the blood is cooled by 3.0°C at the surface, what is the rate of heat transfer in watts due to blood flow (force convection) . You may assume that the specific heat of blood is the same as that for water and that the density of blood is 1.05g/cm3. Note that although the core and skin normally differ in temperature by 3°-4°C, the blood will not be cooled by that much . Skin temperature will rise during exercise and the blood must have a greater temperature than the skin in order to transfer heat to it through vessel walls (conduction). Please provide fo…

I have worked on these last two Unknown compounds for a total of 6 hours now and cannot seem to come up with an expanded structure. Can anyone help me it is really crucial I figure this out I have spent 6 hours trying to figure this out today instead of studying for my Organic 2 exam I have at 7:30 tomorrow morning please help. This problem set is also due after my 7:30 am exam ugh.

This is my homework question: Explain the principles of heat energy transfer from one body to another with reference to the following terminology. Temperature difference, Enthalpy, Entropy, Coefficient of heat transfer, Specific heat transfer, Conduction, Convection, Radiation. This is my first week in this class and basically I have had no previous education in this field of thermodynamics or anything related really =S Please my excuse my stupidity. In this forum question I just want to cover Entropy and Enthalpy. This is what I have written so far and I am not sure if I even totally understand this. My questions: 1) ... struggling. Is this enough for…

So, after countless hours of working on my review sheet, I have finally thrown in the towel and decided to ask for help, but not from my professor because he's not very helpful and he's been using the same exam since 1994, and yet there has never been an answer key posted anywhere. So, the students could be doing the review sheet completely wrong and we'd never know.. but, that's a complaint for a different forum. I did 39/50 questions, but I'm stumped on 11 of them. Help would be much appreciated. Thanks! The exact code needed for the synthesis of all the enzymes a cell or an organism can make is ORIGINALLY found in: A. all of the genes possessed by that …

ANY OF THIS CORRECT ? Hi, I'm trying to understand fluids for past 3 weeks but i doesn't go well. can any one help me ? explain it somehow. maybe one of the examples i have. im not asking to for the answer but some kind of formulas of the way to do it ... A piece of wood of mass 4.8kg is 350 x 600 x 300mm thick. When it is floating water, how much of this thickness h is submerged. Calculate the upthrust on the wood and its apparent weight when floating in water? If the top of the wood and the water surface are at atmospheric pressure, what is the pressure at the bottom of the wood and total upward force generated at the bottom the wood? In order to bring the top ju…

For deuterated NAD2H is the first metabolite of gluconeogenesis to incorporate the label G3P? 1. Asked to calculate the moles of protons pumped out of the mitochondrial matrix per mol of FMN molecule as electrons are passed on to coenzyme-Q. First I used this equation: ∆G = -2.303RT(pHout – pHin) + ZF∆yto calculate kj/ mol of protons and that's where I got stuck and don't know what to do next and ∆Gº’= -73.3 kJ/mol ∆pH= 1.3 ∆y= 0.18V and T= 37C. Please help! 2. Asked to calculate how many molecules of FMNH2 need to get oxidized to make 450 g ATP. DG for hydrolysis of ATP is -50.2 kJ/mol and the efficiency of ATP synthase is 40.2% and MM of ATP= 503.15g/mol. F…

An reaction follows michaelis menten enzyme kinetics. Km=.001 M, and the initial concentration of substrate=0.840993 M. After 2 seconds, 5% of the substrate has been converted to product. How much CO2 will be converted after 10, 30, and 60 seconds? I know the answer is 25% after 10 seconds, 75% after 30 seconds, and 100% after 50 seconds, but I don't know how to get these numbers using the m-m equations: v=d[P]/dt=Vmax*/ +Km Just looking at the answers, it seems like the reaction rate just stays the same, and 5% is converted for each 2 seconds the reaction goes. However, I feel like this a huge simplification...what was the point of including Km and the initial s…

So we just started a unit on motion. The question is: Calculate the mass of an object if it accelerated at 3.5m/s squared under the influence of a net force of 70N. Is the way to work this out just m= w/g? I got 20kg.

Hi, I came across a question where it said adding sugar to water will decrease the temperature of the water and I have to explain why. I understand that it is due to the bonding with the water and sugar and my reason for that is this: -When sugar formed a bond with water, the bonding releases energy in the form of heat. Therefore, the temperature of the water decreases for the heat is transferred to the surroundings. But it appears that I am wrong, for I searched google and it appears that surrounding is part of the "temperature" of the water. Does that mean that the answer to the question is: -When the heat broke the bonds between water and hydrogen at…

Hi, I am doing a project on a mixture of Aluminum and Ammonium Nitrate. When you mix these together it makes an explosive, which will only go off when you shoot it with a rifle. I have a few questions regarding what happens between the two. 1. What makes the aluminum a catalyst 2. Is the ammonium nitrate detonating? 3. From what I've read, the aluminum acts as a catalyst and makes a lower energy pathway for detonation. The aluminum makes the the ammonium nitrate unstable. Is this correct? 4. Does the aluminum make a small detonation when under high pressure or is impacted very hard? If this is totally wrong feel free to tell me what is going on in the mi…

Clonally selection and expansion work much the same way in B cells as in T cells. Only B cells with appropriate antigen specificity are selected for and expanded. Eventually, the plasma cells secrete antibodies with antigenic specificity identical to those that were on the surfaces of the selected B cells. Notice in the figure that both plasma cells and memory B cells are generated simultaneously. This flow chart shows how the clonally selection of B cells BIO X4 takes place. The left panel shows the primary response and the right panel shows the secondary response. During a primary B cell immune response, both antibody-secreting plasma cells and memory B cells are prod…

How can the definition of an acid be "something that donates protons" when protons don't move. Also, why does having an extra hydrogen atom make an acid an acid and vice versa with hydroxide and bases. Finally, what does it mean when an acid increases the H+ concentration in a solution? Thanks in Advance!

Look just at position 1. We have work done from left to right p1A1d1, and work done from right to left p2A2d2. What will happen if pressure p2 is higher than pressure p1, but A1d1 is bigger than A2d2, and lets say they result with a net work = 0

Block A weighs 100 lb. The coefficient of kinetic friction between Block A and the inclined surface (θ = 35°) is 0.15. What is the weight of Block B such that when the system is released from rest, Block A accelerates 5 ft/s2down the incline? What is the tension in the cable?

Block A starts from rest and then starts moving up with a constant velocity of -4 m/s. At the same time, Block Bis moving down with velocity vB = 2 m/s and has acceleration defined by aB = -vB. At t = 3 s, what is the velocity (including direction) of Block C? How much (and in what direction) has Block C moved?I'm really clueless about this problem

Hello! I'm new to this forum and I need help understanding a homework problem that I have; You have just purified a peptide that might stimulate nerve cells to grow in culture. You decide to isolate the peptide and determine its amino acid sequence: H2N-trp-ala-lys-ser-thr-ser-met-cys-COOH Why is methionine not the first amino acid in the peptide?

Hello! I'm Izzy! I'm new to this forum so hello from here!!! I need some help in Quantum Mechanics. I'm struggling to understand the differences and setting of electron shells. What exactly is the difference between Shells, Sub-shells and Orbitals? I know Sub-shells make up a whole shell but where do the orbitals come in? Please help....

a) Use the Heisenberg uncertainty principle to calculate Δx for an electron with Δv = 0.670 m/s. b) By what factor is the uncertainty of the (above) electron's position larger than the diameter of the hydrogen atom? (Assume the diameter of the hydrogen atom is 1.00×10-8 cm.) c) Use the Heisenberg uncertainty principle to calculate Δx for a ball (mass = 152 g, diameter = 8.75 cm) with Δv = 0.670 m/s. d) The uncertainty of the (above) ball's position is equal to what factor times the diameter of the ball?

How do I factorize? [MATH]-1-p^2q^2[/MATH] I would have used the idea of difference of two squares to handle this but I found it difficult because of the negative sign. If I factor the -1, I have [MATH]-1(1+p^2q^2)[/MATH] or [MATH]-1(p^2q^2+1)[/MATH] and that makes the terms inside the bracket unfactorizable?

I need your advise on whether using blogs from a commercial writing service is ethical

How do i work out this question? The power station generates 100MW of power at a voltage of 25kV. Transformer A, which links the power station to the transmission cables, has 44 000 turn in its 275kV secondary coil. Calculate the number of turns in the primary coil of transformer A.

Hi everyone. is there anyone that knows if, when I have a subset of a population, I can I standardize the subset?? what I mean is, If I have a unknown number of eggs, I take 30 of that eggs and after I have to use what I know (data obtained from the subgroup) for that 30 eggs on all other eggs, although I do not know how many are the total eggs. How can I do it on R program??? I hope I clearly exposed my question. thank you

Tclear line between when to stimulate mental functions of an adult to delay the moment when mental capacity will be those of an old man and prevent him from becoming a senile person? In all cases, it is desired to maintain a potential Brain Pills or to recover what was lost.As our brain starts to become a bit slower since the twenties, when should we start to stimulate? Why we would look after us only seriously ill people and not of those who are a little less fit? Why would it be wrong to take care of his brain, while we have everything else like maniacs http://thedropnet.com/brain-pills/

Hi If anyone can help me answer the following questions below, it would be a great help. Its about bioreactors, turbulence 1. Why does the power requirement for a bioreactor increase when flooding ( when the cavities in the bioreactor hae merge together and beome large) occurs to the bioreactor? Shouldn't it have a lower power requirement since the agitators are practically spinning air and air much is less dense than liquid. 2. Why is tip speed of the agitator related to having the highest shear force in a bioreactor?

Hello I am curently second year of Molecular biology and i have got this question to answer. I would appreciate if someone could tell me , the very basics of it. Thank you