# Posts by dan

Total # Posts: 1,181

**chemistry**

it was given so we don't have to. I think the teacher is just trying to show us how to use the mole ratios to get partial pressures

*June 21, 2009*

**chemistry**

the formula is given 4c3h4(no5)3 --->12co2(g) +10h20(g)+6n2(g)+02(g)

*June 21, 2009*

**chemistry**

ok heres my question, nitrogylcerin decomposes: 4c3h4(no5)3 --->12co2(g) +10h20(g)+6n2(g)+02(g) whats is the max pressure that a 10.0L container will be able to withstand if 5.00 Nitroglycerin decomposes at temp of 1250c mm of nitroglycerin =227 g/m i got 2.00atm b) what ...

*June 21, 2009*

**chemistry**

A mixture of hydrogen peroxide, H2O2, and hydrazine, N2H4, can be used as a rocket propellant. The reaction is: 7 H2O2(g) + N2H4(l) ® 2 HNO3(aq) + 8 H2O(l) a) How many moles of H2O2 react with 0.477 mol N2H4? [1] ___________ b) How many grams of HNO3 can be produced in a ...

*June 20, 2009*

**chemistry**

thanks looks like im on track

*June 20, 2009*

**chemistry**

question 3: Calculate the density of COCl2, a poisonous gas at 27.0oC and 733 Torr. [3] i got 3.87 g/v

*June 20, 2009*

**chemistry**

woops i mesed up here's my answer A .120 b 1.51%

*June 20, 2009*

**chemistry**

A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The ...

*June 20, 2009*

**Foundation of Financial Management**

Afirm's cost of financing, in an overall sense, is equal to it's? A: Weighted average cost of capital. B: Required yield that investorrs seek for various kinds of securities. C: Required rate of return that investors seek for various kinds of securities. D: All of the ...

*June 9, 2009*

**chemistry**

Does this mean no one is able to or no one has had a chance to answer it?

*June 5, 2009*

**chemistry**

I need to balance hydrolysis equations for the following salts,copper(II) nitrate, sodium tetraborate, sodium bromide, calcium sulfite, potassium sulfate,potassium chloride, sodium acetate, and ammonium bromide.

*June 5, 2009*

**history**

the answer's b totally

*May 26, 2009*

**German**

"My mum has black hair and dark brown eyes. She is very tall. She is very caring but can be quite mean sometimes. Meine Mutti hat schwarze Haare und dunkel braune Augen. Sie ist sehr hoch. Sie ist sehr fürsorglich, aber sie kann manchmal recht bedeuten. My sister is ...

*May 5, 2009*

**Math**

The bus fare in a city is $1.75. People who use the bus have the options of purchasing a monthly coupon for $29.00. With the coupon book, the fare is reduced to $0.75. Determine the number of times in a month the bus must be used so that the total monthly cost without the ...

*May 3, 2009*

**Math Grade 12**

H=7 -8 cos (2 pi t/3) seems correct, I didn't check your math though. If H is the height of the initial point after t seconds, simply set t = 5.5 seconds and solve for H. H = 7 - 8 cos(2pi*5.5/3)

*April 8, 2009*

**Health**

Boyfriends/girlfriends come and go. Abstinence is a one shot deal. Also, someone that is pressuring you to do something you don't want to do probably isn't a good person to be going out with.

*April 7, 2009*

**Math**

Assigning each letter of the alphabet the numerical values of its position in the alphabet (a=1, b=2, c=3, etc) find a familiar first name witha product of letter values that is equal to 100,000.

*March 23, 2009*

**Chemistry-help**

Fe+S=FeS

*March 20, 2009*

**chemistry**

4.20atm

*March 10, 2009*

**Physics**

What Net Force is necessary to give a 2.0 kg mass initially at rest an acceleration of 5.0 m/s^2? Is the answer 10. N?

*March 9, 2009*

**math**

F=Gm^2/r^2 G=? The answers are: Fr^2/m^2 sqrt(F)m/r sqrt(F)r/m

*March 8, 2009*

**math**

E=hf-w w=? The answers are: -E/hf E+hf hf-E

*March 8, 2009*

**Math**

E=hf-w w=? My answer was E/hf but I think this is wrong.

*March 8, 2009*

**math**

F=Gm^2/r^2 G=? My answer is Fm^2/r^2. Is this right?

*March 8, 2009*

**Pre-Cal**

Find f X g 3 sqrt of x+1 X x^3+1

*February 26, 2009*

**Spanish**

i sint know man. its up 2 u\

*February 26, 2009*

**Math**

use the functions f(x)=x+4 and g(x)=2x-5 to find the specified functions. (g X f)^-1 Would the answer be x+1 over 2?

*February 20, 2009*

**Math**

Use the functions f(x)=1/8x-3 and g(x)=x^3 to find the indicated value or function. (g^-1 X f^-1)(-3)

*February 20, 2009*

**Math(Please help)**

Use the functions f(x)=1/8x-3 and g(x)=x^3 to find the indicated value or function. (g^-1 X f^-1)(-3)

*February 19, 2009*

**Pre-cal**

Compare the graph of the function with the graph of f(x)=|x| y=|-x|

*February 18, 2009*

**trig**

how do i get the degree for (tan+1)(tanx-2)=0 in the interval of 0 is less that or equal to x and x is less then or equal to 360

*February 11, 2009*

**Pre-Cal**

What is the domain of f/g? f(x)= x over x+1, g(x)=x^3 I have no idea how to figure this out!

*February 10, 2009*

**Math**

Find the domain and range of the functon: f(x)=1/2 |x-2|

*February 8, 2009*

**Marine Science**

Organisms on a rocky shore compete for all of the following except? 1) Affection 2) Nutrients 3) Space 4) Light I think the answer might be light but im not sure.

*February 4, 2009*

**6th grade_Science/Math**

Imagine there is a large boulder on the edge of a shoreline. If a wave period is 15 s long. how many times is the boulder hit in a year? Thank you

*January 27, 2009*

**math**

The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10. a. Compute the range. b. Compute the mean deviation. c. Compute the standard deviation.

*January 9, 2009*

**Biology**

What cell structure/organelle would be especially common in i)cells lining the respiratory passages? ii)white blood cells that engulf and detroy invading bacteria iii)enzyme (protein) secreting cells of the pancreas

*January 4, 2009*

**Physics**

Which would be more effective in breaking a rope: 2 people pulling a rope tug-of-war style, or 2 people pulling the same end of the rope with the other end tied to the wall?

*December 9, 2008*

**math**

according to some students what is the true purpose of homework

*December 5, 2008*

**spanish**

I need help.. i need to make 4 sentences.. With... (Miro) (Miramos) El, la, al, a la empleado video carpeta profesora I don't care how u make them i just need help..

*December 2, 2008*

**Physics**

A 0.250 kilogram box has a speed of 2m/s when it is 1.2 meters from a second mass. It is sliding on a table with a coefficient of friction of 0.20. The box collides and sticks to a 0.5kg box that sits on the end of the table, causing the boxes to fall. How fast are the boxes ...

*November 18, 2008*

**Calculus**

Show that y= x + sinx-pi satisfies the initial value problem dy/dx=1 + cos x, y(pi)= 0 i don't understand how to do this problem. i don't know where to begin.

*November 18, 2008*

**college**

What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.

*November 17, 2008*

**4th grade**

temperature - noun

*November 17, 2008*

**probability**

What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.

*November 17, 2008*

**probability**

What is the probability that 4 rolls of fair die will show three 4's? the answer is 0.015, but I don't know how to get it.

*November 17, 2008*

**Math**

3 choices x 5 choices = 15

*November 17, 2008*

**CALC**

find the following derivatives: f(x) = (2x+5)/(x^2-3) f'(x)= (2)*(x^2 -3)-(2x+5)*2x/(x^2-3)^2 is that correct??? f(x)= (lnx)(cos x) f'(x)= 1/x*-sinx or do i have to use the product rule?? thank you.

*November 9, 2008*

**calculus**

find the following derivatives: f(x) = (2x+5)/(x^2-3) f'(x)= (2)*(x^2 -3)-(2x+5)*2x/(x^2-3)^2 is that correct??? f(x)= (lnx)(cos x) f'(x)= 1/x*-sinx or do i have to use the product rule?? thank you.

*November 9, 2008*

**calc**

t 2 4 6 8 10 12 v(t) 44 42 41 40 37 35 the velocity in the table is decreasing 2 </= x </= 12. Using n=5 subdivisions, approximate the total distance traveled for: a) an upper estimate b) a lower estimate i'm not quite sure what the question is asking. i don't ...

*November 2, 2008*

**Calculus**

t 2 4 6 8 10 12 v(t) 44 42 41 40 37 35 the velocity in the table is decreasing 2 </= x </= 12. Using n=5 subdivisions, approximate the total distance traveled for: a) an upper estimate b) a lower estimate i'm not quite sure what the question is asking. i don't ...

*November 2, 2008*

**math**

im not 1 of the pros at answering the questions but i think i can help. y=4/9x-7/9. i got this cuz it has to be y=mx+b. when u move the 9y to the other side of the = it becomes negative and the same goes for the 4x. then you have to divide the -4x and the 7 by the -9. the x ...

*November 1, 2008*

**Physics**

A spring with spring constant k=100 (N/m) is at its equilibrium length. a) How much elastic potential energy is stored in the spring? b) The same spring is stretched so that it is 6.0 cm longer than its equilibrium length. How much elastic potential energy is stored in the ...

*November 1, 2008*

**4thgrade math**

it would be 9 because the number after the point (decimal) is less than 5.

*November 1, 2008*

**math**

While shopping for an air conditioner, Adam Bryer consulted the following table giving a machines BTUs and the square footage that it would cool. Ft^2(x) BTUs(y) 150 5000 175 5500 215 6000 250 6500 280 7000 310 7500 350 8000 370 8500 420 9000 450 9500 a. Find the equation for ...

*October 31, 2008*

**calculus**

what is the derivative of 1/x??

*October 30, 2008*

**calc**

i got -1/x^2 but i don't think that is correct.

*October 30, 2008*

**calc**

what is the derivative of 1/x??

*October 30, 2008*

**Calc**

When you cough, your windpipe contacts. The speed v, with which air comes depends on the radius,r, of your windpipe. If R is the rest radius of your windpipe, then for r </= R the speed is given by: v=2(R-r)r^2 i got the derivative: v'=4rR-6r what do i do next??

*October 28, 2008*

**chemistry**

How do you express the number 6 as two significant figures?

*October 28, 2008*

**Chemistry**

If the column of water in the water bormeter rose to a height of 35 feet, what would the atmospheric pressure be in mm Hg?

*October 21, 2008*

**Math**

Fluffy, Spot and Champ combined dog years is 91. Spot is 14 years older than Fluffy, Champ is6 years older than Fluffy. Write and equation and solve how old Fluffy is? Thanks

*October 16, 2008*

**6th grade**

Thank you. Dan

*October 13, 2008*

**6th grade**

The left and right - hand margins on a sheet of paper are both 1.25 inches wide. The total width of the sheet t of paper is 8.5 inches. Write and solve an equation to find the width of the text area that lies betwen the margins.

*October 13, 2008*

**chemistry**

84.86

*October 8, 2008*

**10th grade Literature**

2. "THEY" are the humans of Earth. The implication is that astronomers on Mars noticed the nuclear destruction of planet earth. This poem was likely written before we knew that there was no intelligent life on mars. It's meant to convey a sense of irony that ...

*September 21, 2008*

**Math**

Two different isosceles triangles with perimeter 4a+b? Is this a right angle isosceles triangle?

*September 17, 2008*

**American Government**

How did the Founders expect to promote civic virtue in a country as large and diverse as the United States?

*August 22, 2008*

**chemistry**

A balloon filled with helium has a volume of 30.0 L at a pressure of 100 kPa and a temperature of 15 degrees C. What will the volume of the balloon be if the temperature is increased to 80 degrees C and the pressure remains constant?

*August 4, 2008*

**chemistry**

What is Dalton's law of partial pressures? Explain how this law relates to the fact that mountain climbers must carry tanks of oxygen when scaling high peaks.

*August 4, 2008*

**chemistry**

okay. The 10 g mass was throwing me off.

*August 4, 2008*

**English**

It will give me a sense of accomplishments. is this a grammatical correct sentence?

*July 27, 2008*

**health**

what are three disadvantages of HIPAA?

*July 16, 2008*

**Algebra**

Evaluate the function at the given value of the independent variable and simplify. f(x) = 2x2 - 5x + 6; f(x - 1)

*July 3, 2008*

**economics**

How are the ways that the former Soviet Union and China have moved toward market based economies different?

*June 29, 2008*

**economics**

complex models are always better than simple ones. true or false?

*June 17, 2008*

**Social studies**

butt cakes

*May 30, 2008*

**Spanish**

Actually, it is like this (Spanish is my native language after all): Compraba- it bought compro- i buy Se comio- was eaten Quiere comerse- wants to eat esta comprando- is buying

*April 28, 2008*

**history**

Explain the politics of the consensus and explain the pragmatic political measures Eisenhower used to manage the economy?

*April 25, 2008*

**English Lit**

If you're familiar with James Baldwin please help me. I need to identify his writing style. So far I got something in between stream of consciousness and lots of poetic devices but I think I need something more concrete than that. HELP?

*April 19, 2008*

**Maths probability**

Two Fair Dice are thrown and the differance is noted.Draw the sample space.What is the probability that ther is no differance.

*April 15, 2008*

**Short Circuit Problem (Physics)**

No problem ^^

*April 12, 2008*

**Short Circuit Problem (Physics)**

emf sets top most node to emf V. Nodal at top node: (emf - V)/5 = 2A => emf = 43V ohms law at top node: (43V - 33V)/12 = Current right branch = 0.83A Current in left branch = A + 0.83 = 2.83A R = 33/2.83 = 11.66 Ohms Although, this question is a little odd because there'...

*April 12, 2008*

**accounting**

I have a project due on the Colo Company can anyone help figure out the worksheet

*April 7, 2008*

**Chemistry (reactions)**

Ch3Ch2Ch2MgBr + H2O = I just need to complete the reaction not balance it.

*April 6, 2008*

**religous**

To answer Writeacher, we didn't say that there weren't similarities, we just said that they aren't the same religion. I can say quite firmly that Judaism and Christianity are not too similar, let alone Islam and Christianity. I would not say that Jews and ...

*March 27, 2008*

**Physics.**

i don't know.

*March 25, 2008*

**music**

I'm not entirely sure what you need help with. G major has one sharp, F sharp, and F major has a B flat. G major scale: G A B C D E Fsharp G 1 2 3 1 2 3 4 5 F major scale: F G A Bflat C D E F 1 2 3 4 1 2 3 4 I've listed the piano fingerings under the notes.

*March 19, 2008*

**oceanography**

A monster storm located 1200 km north of Hawaii generates wind waves with maximum wavelengths of 150 m. Calculate how much time you have to get to the north shore and surf the first big waves. Assume that the average depth of the North Pacific is 3800 m, and that there is no ...

*March 17, 2008*

**IT 221**

Does anyone have anything on this?

*March 14, 2008*

**Economics**

A firm with monoply power has the demand curve: P = 100 - 3Q + 4A^1/2 And has the total cost function: C = 4Q^2 + 10Q + A where A is the level of advertising expenditures. P is price, Q is output. How do I find the values of A, Q, and P that maximize the firm's profit?

*March 1, 2008*

**Algebra II**

Your solution is perfect, did you just want confirmation?

*February 29, 2008*

**Algebra II**

What exactly is your question? I don't even see a denominator anywhere :) What you have is right so far. If you want to finish that question you need to use the quadratic formula x = (-b +/- square root(b^2 - 4ac)) / 2a x = (5 +/- square root (25 + 192)) / 16 x = (5 +/- ...

*February 29, 2008*

**Geometry and Measurement**

For a right angle triangle the following equation is true: a^2 + b^2 = c^2 Where c is the hypotenuse of the triangle and a,b are the other sides (you decide which side is a and which side is b).

*February 29, 2008*

**math**

First you have to expand your terms. 7y^2 - 5y^3 - 180y^2 - 55 = -100 Collect like terms. -5y^3 -173y^2 = -45 now factor the y^2 y^2(-5y - 173) = -45 There are two solutions to this equation. y = 0 and 5y + 173 = 45 which yields y = -25.6

*February 29, 2008*

**Math**

n is the number of moles. It's usually equal to one to simplify matters.

*February 29, 2008*

**Physics**

I'm not familiar with that particular term, but mach number .85 could possibly mean 0.85 times the speed of sound.

*February 29, 2008*

**calculus**

"If the sequence An converges to 0, and each An is smaller than An-1 (i.e. the sequence An is monotone decreasing), then the series converges." In this case, An = 1 / (3n + 1) The limit as n->infinity (An) = 0 A1 = 1 / 4 A2 = 1 / 7 Therefore, by the Alternating ...

*February 28, 2008*

**Math - Slight Error**

Whoops, I read those numbers wrong. The area of two sides will be l*h and the other four will be w*h. So the total area = 2(l*h) + 4(w*h) Sorry about that :S

*February 28, 2008*

**Math**

I'm assuming length is depth. A rectangular solid has 6 sides, so the total area will simply be 6 times the area of one side. The area of one side is the area of square which is w*h. The volume of a rectangular solid is l*w*h. From Google, "The lateral area is the ...

*February 28, 2008*