Friday

December 19, 2014

December 19, 2014

Total # Posts: 525

**chemistry**

this does not give the answer
*June 21, 2011*

**chemistry**

is there any way i can see an answer for this.. i have it as an a level chemistry question and im either having a mental block... or totallyyy dont get it ?
*June 21, 2011*

**science**

A block of mass 0.5 kg is pushed a distance x against a spring with k=450 N/m. When released the block slides along a frictionless horizontal surface to a point B, the bottom of a vertical circular track of radius R=1 meter. The track is not smooth. When the block reaches ...
*June 18, 2011*

**history**

who was john ball and his conection to the peasents.data...
*June 14, 2011*

**history**

Thank You....
*June 14, 2011*

**history**

who was john ball and his connection to the peasants data (1381)....
*June 14, 2011*

**calculus**

Sorry to post this again, but I am still unable to understand it and need help. Please help.1) Using 3(x-3)(x^2-6x+23)^2 as the answer to differentiating f(x)=(x^2-6x+23)^3/2, which I have been able to do, I need to find the general solution of the differential equation dy/dx...
*May 22, 2011*

**Maths**

How can answer this question ,help please? Information: A ship travels at a constant speed of 25 kilometres per hour (Kph) in a straight line from port A located at position (x_A, y_A) =(-100, -100) to port B at (x_B ,y_B )=(300 ,100) During its journey ,the ship passes two ...
*May 5, 2011*

**Maths**

Find the particular solution of the differential equation from: dy/dx = 2/27(x-3)ã(x^2-6x+23) / (y) (y>0. For which y=2 when x =1, and then give this particular solution in explicit form. regards Claire
*April 6, 2011*

**Maths**

Hi Please can you help? Really sorry for repeating the question but I wrote it incorrect before. Find the particular solution of the differential equation from dy/dx=2/27(x-3)ã(x^2-6x+23) / (y) (y>0. for which y = 2 when x = 1, and then give this particular ...
*April 4, 2011*

**maths**

Hi Please can you help? Find the particular solution of the differential equation from dy/dx=2/27(x-3)ã(x^2-6x+23) / (y) (y>0. for which y = 2 when x = 1, and then give this particular solution in explicit form? thank you in advance for any help regards Claire
*March 30, 2011*

**maths**

Hi Please can you help Find the particular solution of the differential equation from f(x)=(x^2-6x+23)^(3/2)for which y=2 when x = 1, and then give this particular solution in explicit form? Am I correct that the following is the explicit form (not confident). 2^2=(4/81)(1^2-6...
*March 30, 2011*

**maths**

Looking for some guidance please, I need to find the initial-value problem for dy/dx = 1+2cos^2x / y. y = 1 when x = 0. any help is much appricated
*March 25, 2011*

**science**

answer please
*March 23, 2011*

**science**

also one of the tyres has a slow puncture and the air pressure in the tyre falls. what happens to the area of tyre in contact with the road?
*March 23, 2011*

**science**

john has a bike when john gets on the bike, the force on each tyre increases. what happens to the area of tyre in contact with the road?
*March 23, 2011*

**maths**

Hi Looking for some guidance please, I need to find the initial-value problem for dy/dx = 1+2cos^2x / y. y = 1 when x = 0. any help is much appricated regards CLAIRE
*March 22, 2011*

**maths**

Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest to the probability that a couple who continue ...
*March 16, 2011*

**mah**

factorise (5+9x-2x^2)/ ((x^2-6x+23)^ (5/2))
*March 14, 2011*

**maths**

Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest to the probability that a couple who continue ...
*March 14, 2011*

**physics**

Surprisingly, very few athletes can jump more than 2.0 ft (0.62 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.0 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.
*March 1, 2011*

**maths**

Can anyone help with te following please The total volume V(x)cm^3 of a container is given by V(x)= 4(x + ãx(8-x)) (<0x<8). Calculate the maximum possible volume of the container? The shape is two isoseles triangles but connected together to form the ...
*February 22, 2011*

**maths**

Can anyone help with te following please The total volume V(x)cm^3of a container is given by V(x)=4(x+ãx(8-x)) (<0x<8). Calculate the maximum possible volume of the container? regards Claire
*February 21, 2011*

**Maths**

Hi I am really sorry I now people have already attempted to help me with this one already, however I am still not able to understand, I really have not done a lot of these equations and am struggling. I have put a little more information down this time, any help is much ...
*February 17, 2011*

**calculus maths**

Hi can some one help, explain the following please. I seem to have issues with this: 1- Find the corresponding particular solution (in implicit form) that satisfies the initial; condition y = when x = 0. 2- Find the explicit form of this particular solution. 3- What is the ...
*February 15, 2011*

**trig**

find x in DMS if 2sinx-1=cscx
*February 10, 2011*

**maths**

Can any one help with the following please: Solve the initial-value problem: problem: dy/dx: 4(3cos(6x)-1)/1+2x-sin(6x) y=12 when x=0
*February 8, 2011*

**Physics**

I don't understand why the normal force is 9.4. If the object weighs 10 kg, the Fg in the y direction should be 92.1N, correct which would make the Fn 92.1N as well.
*January 28, 2011*

**math**

Working on exploring algebra: Whats the Rule I understand the rules of In and out but cannot find rule with variable? Do I make up my own because the in and out equations are all correct. Please help. Ex. In 2 out 6 rule is add 4 what is rule with variable?
*January 24, 2011*

**RE**

my homework for me im in year 7.... research the story from Joseph to Moses. design film poster for this story...
*January 23, 2011*

**RE**

how do i draw a film poster of joseph to moses....
*January 23, 2011*

**French**

I forgot to say, I'm using this with avoir. Like: Je les ai _____.
*January 18, 2011*

**French**

Hello, I'm just wondering how I would conjugate the verb "apporter" in the passe compose, to agree with gender and number? I know that in the passe compose, apporter becomes apporte (with an accent). But when it needs to be feminine, does it become aportee? And ...
*January 18, 2011*

**Geometry helpp!!**

Can anyone graph this please!!! 5. Perform these transformations on ∆TRL and compute the perimeter of the pre-image and final image. a. Rotate ∆TRL 180° about the origin and label the resulting image ∆T’ R’ L’. b. Reflect ∆T’ R&#...
*January 12, 2011*

**Geometry helpp!!**

Can anyone graph this please!!! 5. Perform these transformations on ∆TRL and compute the perimeter of the pre-image and final image. a. Rotate ∆TRL 180° about the origin and label the resulting image ∆T’ R’ L’. b. Reflect ∆T’ R&#...
*January 12, 2011*

**Matrices**

[0; x] = [-0.71 0.71; -0.71 -0.71][0.015; 0] + [-0.71 0.71; -0.71 -0.71][cos(y) -sin(y); sin(y) cos(y)][0.035; 0] I need to solve this matrix for x and y using Excel. Can someone tell me how to do it please?
*December 18, 2010*

**Math**

15. Eric has a straight garden path which is 2' x 15'. He wants to cover it with tiles that are each 1' x 2'.HOW MANY WAYS CAN HE DO THIS?
*December 9, 2010*

**Math**

Eric has a straight garden path which is 2' x 15'. He wants to cover it with tiles that are each 1' x 2'.How many ways can he do this?
*December 9, 2010*

**math**

114/18 sections is 6.333333' from post to post
*December 8, 2010*

**Electrical Switches**

What are the factors you consider when buying an electrical switch? I want to know what different people consider in order to obtain a good selection procedure. Thanks!
*November 25, 2010*

**Physics**

A 3.5 kg body accelerates from rest to 20 m/s in 5 s. Calculate: A its acceleration B the force required.
*November 21, 2010*

**Business law**

I need help answering questions to a case. The case is: Wagner V. Columbia Pictures Industries, Inc. I don't know if you can find this online or not. These are the questions I need help with: 1. How might the result of this case have been different if the court had ...
*November 7, 2010*

**physics**

a.) 1.65 m/s
*November 4, 2010*

**Fluid Mechanics**

A cylindrical tank 2m diameter and 4m long with its axis horizontal, is half filled with water and half filled with oil of density 800kg/m^3. Determine the magnitude and position of the net hydrostatic force on one end of the tank. The answers should be 27.9kN, 1.26m from the ...
*November 3, 2010*

**Fluid Mechanics**

A tank is 180cm long, 90cm deep and 90cm wide at the top, tapering to 30cm wide at the base. If the tank is completely filled with water, calculate: a) the total weight of the water in the tank b) The total force exerted by the water on the bottom c) The total force exerted on...
*November 2, 2010*

**chemistry**

the dissociation of molecular iodine into iodine atoms is represented as: I2 =2I Suppose that .0256 mole of I2 was placed in a 2.30 L flask at 1000K. what is the intial concentration of the I2 before any reaction occurs?
*November 1, 2010*

**Fluid Mechanics**

A closed tank, rectangular in plan with vertical sides, is 1.8m deep and contains water to a depth of 1.2m. The enclosed space above the water is pressurized with air up to 35kPa. If the length of one wall of the tank is 3m, determine the resultant force on this wall and the ...
*October 31, 2010*

**Fluid Mechanics**

A circular disc having a diameter of 125cm is immersed in water so that the distance of its perimeter measured vertically below the water surface varies between 60cm and 150cm. Find the total force due to the water acting on one side of the lamina, and the vertical distance of...
*October 31, 2010*

**Physics**

A helicopter has two blades (see figure), each of which has a mass of 220 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an angular speed of 45 rad/s. (a) What is the total moment of inertia of the two blades about the axis of rotation? (a...
*October 27, 2010*

**business-location**

ok I did that and got x as 23 and y as 26 so when i use that against the three sites why are they not the same distance?
*October 24, 2010*

**business-location**

Ready Mix Concrete Company is planning on developing new markets in a growing community. It had recently acquired large orders in three locations: downtown, at a mall, and in a suburb. The destinations and loads to be delivered are the following: Delivery Site: Downtown ...
*October 24, 2010*

**naming compounds**

thanks:)
*October 19, 2010*

**naming compounds**

write the name of this compound:(charge) Pb(2+)Cl2 is lead(II)chloride so.. i just need to know if my answers correct. thanks:)
*October 19, 2010*

**chem- ion**

oh i got it!! nevermind.
*October 19, 2010*

**chem- ion**

naming chemical compounds. I don't really get how you get the symbol from the word or the other way around for polyotomic ions so.. here are some examples that a website gave me: this is wut the site said to do:(Its confusing to me) The name of the compound should have a ...
*October 19, 2010*

**Chemistry**

The U.S. Food and Drug Administration lists dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) among the many cancer-causing chlorinated organic compounds. what are the partial pressures of these substances in the vapor above a mixture containing 1.75 mol of CH2Cl2 and 1...
*October 18, 2010*

**Maths**

Solve for x: 5sin(2x) + cos(x) = -1.916 Can someone please show me the steps?
*October 17, 2010*

**poems**

I tried the iambic tetrameter type but i just couldn't find good enough words. But, i did try to make it follow a patttern(with each sentence starting with you and then a verb. Do you think it is better written now? Oh, picture in a picture frame. You write a story with ...
*October 17, 2010*

**poems**

for english class i have to write a poem personifying something. I chose to personify a picture in a picture frame. I am not at all good at poems and was wondering if you guys could read mine and tell me what changed i should make and if its really bad and i should just start...
*October 17, 2010*

**personification poem**

for english class i have to write a poem personifying something. I chose to personify a picture in a picture frame. I am not at all good at poems and was wondering if you guys could read mine and tell me what changed i should make and if its really bad and i should just start ...
*October 16, 2010*

**Engineering Kinematic**

The particle travels along the path defined by the parabola y=0.5(x^2). If the component of velocity along the x-axis is v=5t [m/s], determine the particle's distance from the origin and the magnitude of its acceleration when t=1s. The initial condition is t=0, x=0 and y=0...
*October 16, 2010*

**science**

how do I make a simple model cell?
*October 11, 2010*

**re**

how does the 'lords prayer' describe god.
*October 9, 2010*

**Need help creating a monthly cash budget (hwk)**

I started, but don't know if I'm going in the right direction: Here is the information on the sheet: Your carpet cleaning entrepreneurship: Supposed that your hometown is Petoskey, Michigan. After college graduation you decided to go into business for yourself because ...
*October 2, 2010*

**Accounting help**

I'm trying to make an income statement...for sales revenue out of this information what do I add up? Sales Revenue Forecast: June (actual) 24,000 July (actual) 20,000 August 28,000 September 52,000 October 44,000 November 76,000 December 96,000 January 22,000 February 32,...
*September 25, 2010*

**business law**

I already have the case, I need help answering the questions.
*September 17, 2010*

**business law**

I need help answering questions to a case that is in my business law book. The case is Granholm V. Heald and the questions are: What if the facts were different? Suppose that the states had only required the out-of-state wineries to obtain a special license that was readily ...
*September 17, 2010*

**history**

how did the romans built cities and showed us how to organize these?
*September 14, 2010*

**college**

what quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300 mL of a 45% solution
*September 2, 2010*

**math**

Determine the x-intercept and y-intercept of 3x - 6y = 12.(Points : 2) (9, 0) and (0, -3) (4, 0) and (0, -2) (-4, 0) and (0, 4)
*August 31, 2010*

**Inverse Functions & Trig. Equations**

7. Evaluate sin[sin^-1(-1/2)]. a. 1/2 b. ð /6 c. -1/2 d. - ð /6 8. Evaluate cos[tan^-1(5/12)]. a. 12/13 b. 12/5 c. 5/12 d. 5/13 9. Evaluate cos[sin^-1(-3/5)]. a. -4/5 b. 5/4 c. 4/5 d. -3/4
*August 7, 2010*

**trig**

8. Write the equation for simple harmonic motion given that the amplitude is 5 centimeters and the frequency is 2/ ð cycles per second. Assume that the maximum displacement occurs when t = 0. a. y = 5sin4t b. y = 5cos2t c. y = 5cos4t d. y = 5sin2t 9. Write the equation for...
*August 6, 2010*

**Thermodynamics**

A turbine operating under steady flow conditions receives steam at the following state: pressure 13.8 bar, specific volume 0.143 m^3/kg, specific internal energy 2591kJ/kg and velocity 30m/s. The state of steam leaving the turbine is as follows: pressure 0.35 bar, specific ...
*June 3, 2010*

**Electronics**

How does a thyristor work when using ac voltage?
*May 23, 2010*

**geography**

The answer is A. Chinese Characters alone give no clue to the pronunciation.
*May 8, 2010*

**chemistry**

Given: H2 (g) + O2 (g) ⇌ H2O2 (g) K = 2.3 x 106 at 600 K 2 H2 (g) + O2 (g) ⇌ 2 H2O (g) K = 1.8 x 1037 at 600 K Calculate Gº for the following reaction: H2O (g) + 1/2 O2 (g) ⇌ H2O2 (g)
*May 3, 2010*

**chemistry**

In diatomic molecules of elements, the electronegativites of the two atoms are _________, so the electrons are shared ___________.
*April 26, 2010*

**U.S. History**

Who benefitted more from the compromise of 1850, the north or south?
*April 20, 2010*

**Electronics**

A series circuit consists of a 12V source, a 470ohm resistor(R1), a 330ohm resistor(R2) and a diode. If the diode is reverse biased, what is the value of V(R1) and V(R2)?
*April 17, 2010*

**moments of inertia**

I determined the area moment of inertia and the product of inertia of the cross-section of a beam about the centroidal axes using equations. I am now asked to design an experiment to verify the results that I obtained through equations. Can someone please suggest an experiment...
*April 7, 2010*

**Chemistry**

Thank you! That was very helpful. My final answer for the pH was 1.39. Is that correct?
*March 31, 2010*

**Chemistry**

At 300.K and 1.00 atm, assume that 25 mL of NO gas reacts with 22 mL of oxygen gas and excess water to produce nitric acid according to the following equation: 2NO(g)+(3/2)O2(g)+H2O(l)-->2HNO3(g) If all of the nitric acid produced by this reaction is dissolved into 25 mL of...
*March 31, 2010*

**finance**

A machine cost $ 4,000. It lasts 2 years and has no scrap value (that is, it has no value at the end of those two years of use). In each year, it produces $ 2400 in income. Should the firm invest in the machine if the interest rate is 10%? Should the firm invest in the machine...
*March 28, 2010*

**4th grade English**

Please check the following, thanks. First Syllable Accented Cancel Chamber Gather Tender Damage action Second Syllable Accented Frosty Mustang Convince Belief Behave Certain Remind Confuse Contain
*March 26, 2010*

**science**

How does the rainshadow effect happen?
*March 23, 2010*

**ALGEBRA**

Sqrt(x+3)+1-1=8-1 [sqrt(x+3)]square=7square x+3-3=49-3 x=46
*March 23, 2010*

**Thermodynamics**

a rigid vessel of volume 1m(^3) contains steam at 20bar and 400 degrees Celcius. The vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel, the final pressure of the steam and the heat rejected during the process. The answers should ...
*March 12, 2010*

**Incorrect comma usage?-**

Thank you!
*March 11, 2010*

**Incorrect comma usage?-**

This begins with the titan Cronos’ mother, Earth, who encourages her children to overthrow their father, Heaven, because out of dislike, he keeps them locked away. does this look right?
*March 11, 2010*

**Writing**

I've had to change my paper a bit, because my professor wants it firmly based in the archaic age, but not directed to a particular polis. From what I understand, I should have a central idea (e.g. women were seen as inferior) that is directly represented within the texts, ...
*March 10, 2010*

**Writing / Thesis help**

Women in Archaic life and literature were viewed as a necessary evil. Opinions on this one?
*March 10, 2010*

**Writing**

Okay, I'm back. :) This is long, sorry! Here is the prompt: Explore the role of women in Archaic Greek society as presented in the literature examined in class. **You might consider how women were viewed relative to men, how they interacted with men, how women related to ...
*March 10, 2010*

**Writing / History**

Thank you! I'm going to stop by my uni's writing center tonight, and then I'll probably repost. :)
*March 9, 2010*

**Writing / History**

Help needed coming up with a specific thesis. Here is the prompt: Explore the role of women in Archaic Greek society as presented in the literature examined in class (The Iliad, Sappho's poems, Archilochus, and a book about Ancient Greece by Thomas Martin). **You might ...
*March 9, 2010*

**Mechanics of Materials**

Thanks a lot!! :)
*March 6, 2010*

**Mechanics of Materials**

A railroad is laid so that there is no stress in the rails at 20 degrees celcius. Calculate the stress in the rails at -6 degrees celcuis if all the contraction is prevented. Take E=206GPa and linear coefficient of expansion is 12 x 10^(-6) /deg celcius. If, however, there is ...
*March 6, 2010*

**3rd grade**

Why are people fearful & excited about Ellis Island?
*March 1, 2010*

**math**

The brightness of a light bulb varies inversely as the square of the distance from the source. If a light bulb has a brightness of 300 lumens at 2 ft, what will its brightness be at 10 ft?
*February 8, 2010*

**math**

The brightness of a light bulb varies inversely as the square of the distance from the source. If a light bulb has a brightness of 300 lumens at 2 ft, what will its brightness be at 10 ft?
*February 8, 2010*

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