Thursday

April 24, 2014

April 24, 2014

Total # Posts: 33

**Trigonometry **

If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please

**Derivatives**

with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got tan x sec x this is wrong. can you explain thank you

**Derivative**

Find dy/dx for the following: 1) x^3 + 3x^2*y + y^3 = 4 I get -3(x+2y)/x^2 + y^2 it's wrong though. 2) x + y^2= xy^2 I get y^2 + 1/ 2y- 2xy this is also wrong. can you explain thanks

**CHEMISTRY**

Suppose you had a detection device that could count every decay event from a radioactive sample of plutonium-239.052156 (t1/2 is 24,000 yr). How many counts per second would you obtain from a sample containing 0.126 g of plutonium-239? (The mass of Pu-239 is 239.052156 u. Assu...

**Soial Work**

Discuss a case fro the NM court which has used a ruling involving the Tarasoff case

**HIS 103**

why didn't Byzantium have much more cultural influence farther west, rather than in eastern and southeastern Europe?

**HIS 103**

What made Byzantium "Roman" other than its formerly being part of the Roman Empire? How Roman was it when it spoke Greek and, after the 11th century, was no longer Catholic?

**HIS 103**

Good overview; how did Eastern Orthodox Christianity (which split from the Catholic Church in the mid-11th century) differ from Rome in its basic concepts and worship style?

**HIS 103**

Was a more fluid social structure, with more change and mobility somehow not diserable in the caste system

**Math and Society**

Which solid has the greatest volume? a)A right cylindrical cylinder with a radius of 4 inches; b)A cube with a side of length of 4 inches; or c) a sphere with a radius of 4 inches?

**microbiology**

Lactobacillus species ferment glucose, as demonstrated by the snyder test. What other metabolic functions might they perform judging by the list of ingredients: Yeast extract, agar, sodium chloride, pancreatic digestive casein. Thank you

**Chemistry**

If a 6.00M solution of sodium hydroxide occupies 520 mL of space how many grams of NaOH is dissolved in the solution? (Remember M = moles/L). And the work.

**Chemistry**

The density of oak lumber is approximately 800km/m^3. What is the mass in grams of 4 cubic meters of oak? And the work.

**Chemistry**

What is the mass in grams of 4.556 x 10^30 lead atoms? Also the work.

**health fraud- hair products**

ok so i have to pick a product basically that is like a fraud and it has to be a hair product. then i have to write a summary about it. so i was thinking a product that claims it can grow hair and stop hair lose. Does anyone know of any products like that, that are pretty famo...

**math**

oh its a rhombus! Thank you!

**math**

provide a counterexample to show that each statement is false. a) if a four sided figure has four congruent sides, then it has for right angles. at first i thought of a trapezoid proves that wrong but then i remembered only 2 sides have to be congruent for that.

**conformity paper**

Just to say first im not wanting anyone to write my paper for me. I have to write an english paper about non conformity and conformity. I already have a load of information but Im looking for a little more. directions:observe conformity as it exists in your society. Note how p...

**chemistry**

28.06 mL to grams

**chemistry **

to DrBob222 wouldn't it be like this then 4.86L/12.75kg*1000cm^3/1L*(1kg/1000g)^3

**chemistry**

An aluminum engine block has a volume of 4.86 L and a mass of 12.75 kg. What is the density of the aluminum in grams per cubic centimeter?

**physics**

What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?

**Social Studies.\ASAP PLEASE**

What factors shaped the move from colonial, country life to modern, urban life? What was urban city life like during the rise of urbanization? How was it different or similar to modern urban life? Can you help me? I have not heard from my teacher about exactly what is need or ...

**Chemistry**

Thank you very much!

**Chemistry**

Can someone please check this for me? C4H8+5O2-->3CO2+4H2O+C Butane is a gas and .01 g of it is burned. Is .00218 g of carbon the result? Thanks

**heath care**

If you search the reading material for the patients name you will find the information needed to answer the first scenario. Just type "Myelin" into the adobe reader search bar.

**college chemistry-thermochemistry**

thanx so much!

**college chemistry-thermochemistry**

i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization from this? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process KBr--->K{+1}(g)+Br{-1}(g), from ...

**college chemistry-thermochemistry**

ya you're right i accidently put the wrong value in!

**college chemistry-thermochemistry**

i have one more question: I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization? Clculate the enthalpy of vaporization of solid potassium bromide to a gas of ions, the process KBr--->K{+1}(g)+Br{-1}(g), from the follow...

**college chemistry-thermochemistry**

I got: delta H= 482.79J 482.79/150gNH4NO3 x 80gNH4NO3/mol NH4NO3 =2574.88J/mol =2.575 kJ/mol Is this right?

**college chemistry-thermochemistry**

A 1.50g sample of NH4NO3(s) is added to 35.0g of water in a foam cup and stirred intil it dissolves. The temperature of the solution drops from 22.7 to 19.4 degrees celcius. What is the heat of dissolution of NH4NO3, expressed in kJ/mol NH4NO3?

**History**

Do you agree with Darwin's idea of natural selection. Why or why not. Give minimum of 3 examples. thanx

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