Aka

Hi, I need help on a project i am doing would anyone know of any other Russian literature that is simmilar, in themes, to Anna Karenina or know where to find any speeches by the Tsar?

Thanks

Hi, can someone help me with this question? Three resistors, R1, R2 and R3, are connected in parallel in an electrical circuit. The total resistance, R, in ohms is given by: 1/R = 1/R1 + 1/R2 + 1/ R3 R, R2, and R3 are increasing at rates of 0.1, 0.5 and 0.7 ohms/s, respectively. Determine the rate at which R1 is changing when R = 50 ohms, R2 = 70 ohms, and R3 = 60 ohms. Find R1 1/50 = 1/R1 + 1/70 + 1/ 60 (1/50)-(1/70)-(1/60)=1/R1 How do you solve something that is in the deominator? the i just Plug eerything in to the equation d/dt 1/R = d/dt 1/R1 + d/dt 1/R2 + d/dt 1/ R3 right?

Hi, I am having trouble with this question Assume that a blood vessel, such as a vein or an artery, has the shape of a cylindrical tube with radious R and lenght L. because of the friction at the walls of the tube, the velocity, v, of blood flowing throught the blood vessel is greatest along the central axis of the tube and decreses as the distance r from the axis increses unitl v becomes 0 at the wall. the relationship between v and r is givin by the law of laminar flow, discovered by the French physician Poiseuille in 1840. the law V= p / 4nl (R^2 - r^2) where n is the velosity of the blood and P is the pressure difference between the ends of the tube. If P and L are constant, then V is a function of r. in a typical human artery, the values are n= 0.002 R= 0.008cm, L = 2cm and P= 400 Pa.s. Find the velocity gradiaent ( the rate of change oh v with respect to r) where r= 0.003 cm. can someone tell me the steps to solving thsi problem? Thanks

http://www.download.com/3120-2001_4-0-2-0.html?qt=grade&ca=2001&excl=10493330

Thanks

Hi, I have a quick question. When you replace the functional group of a fat with a phosphate what do you get?

thanks, I'll try that

I don't know L'Hospital. We have to solve these quesions using difference of cubes.

Hi, I need help with this question is this right? Thanks

Hi, I need help with this question At a publicity event, Ayida, a stuntperson, will jump out of a helicopter with a jetpack on her back. The jetpack allows her to achieve a net upward acceleration of 4.4m/s^2 for a single interval of maximun lenght 10s. Ayida wants to time the use of the jetpack so that she lands with a zero velocity. a) If the helicpter is 100m hight, when should Ayida turn on her jetpack? When will she land? b) If the helicopter is 200m hight, when should Ayadia turn on her jetpack? when will she land? c) What is the maximum height from wich Ayida can jump to land with zero velocity? I don't know where to start can someone explain this problem thanks.

^ sorry, if they were in air at room temperature, on a surface. Alive as in preforming cell functions, metabolism, reproduction etc.

Squamous cell Gonadotropes Hepatocytes pneumocyte pericyte muscle fiber Red blood cells mast cell Merkel cells Squamous Thanks

Hi, how long does a cell, normal and cancerous, live outside a living host?

thanks for your help

ok, thanks

^ Thanks i got it now

the folowing reaction proceeds with a 70% yeild C6H6 + HNO3 = C6H5NO2 + H2O calculate the mass of C6H5NO2 expected if 12.8g of C6H5 reacts with excess HNO3 How do you do this problem? and If 3.45 x 10^23 formula units of Hg(NO3)2 are reacted with excess of Na2S, what mass of HgS can be expected if this process occurs with 97% yield? What are fomula units?

Hi, I really need help with this question 1) the water depth in a harber is 21m at hight tide, and 11m at low tide. One cycle is completed approximatly every 12h. a) find an equation for the water depth as a function of the time, t hours, after low tide b) Draw a graph 48h after low tide, witch occured at 14:00 y=asink(x-c)+d Amplitude a=21-11/2 a=5 K p=2pi/k 12=2pi/k k=2pi/12 k=pi/6 what about the c and the d?? and does anyone know of anygood software to graph trig functions? Thanks

Hi, I need help with this question what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution? =moles of solute/leters of solution =0.50mol/0.30L =1.7 mol/L Is this correct? and what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution I have no idea how to do this one

^ Ok thank you for all your help I really appreciate it I'll keep that in mind...

^ok thanks but i have one more question (sorry..) Suppose that you did not completely convert the hydrate to the anhydrous compound. Explain how this would affect the calculated percent by mass of water in the compound? If the hydrate was not completely converted to the anhydrous compound, the mass of anhydrous Cu(II)SO4 would increase because it would not be pure anhydrous Cu(II)SO4, instead it would be CuSO4•5H2O, in other words you would be weighing the compound plus water. In turn, this would change the mass of H2O, making to higher (for example instead of 3.2g it might be 4.2g.) the results of the percent composition calculation would also change to a higher number, for example %= (4.2/8.6)100 would equal 48.8% of water, compared to 37.2% of water, which is what we got by completely convert the hydrate to the anhydrous compound. i dont know if it makes sence at all

Suppose you heated a sample of hydrated ionic compound in a test tube. What might you expect to see inside the test tube, near the mount of the test tube? Explain You would see water droplets and steam. This is because a hydrate indicates the presents of water, when you heat a hydrated ionic compound the water will separate from the compound, and you will see some of the water collecting near the mount of the test tube. The steam could be a result of the water, or the compound evaporating would that be right? **** Suppose that you did not completely convert the hydrate to the anhydrous compound. Explain how this would affect the molecular formula you determined? you would get more molecules of water???

^thanks But why do you include the dehydrated Cu(II)SO4 and use that instead of using the molar mass of CuSO4•5H2O? I also need help on this question based on your obeservations. determine the molecular formula of CUSO4 • xH2O I don't understand this question, would'nt it be CuSO4 • 5H2O, how are you supposed to do this based on observations?

calculate the precent by mass of water in a sample of hydrated copper (II) sulfate. mass of beaker-165.3g mass of beaker with bluestone-173.9g mass of dehydrated bluestone-170.7g Would this be a ballanced equation for this reaction? CuSO4•5H2O+ heat= CuSO4+5H2O so would you do this %by mass=mass of part/mass of whole =90.1g/249.7g/molx100 = 36% is this correct?