Thursday

March 5, 2015

March 5, 2015

Total # Posts: 143

**math**

Peta attempted to solve the following equation. Explain Peta's error. x (x - 5) = 20 x = 20 and x - 5 = 20 x = 20 and x = 25
*February 13, 2015*

**science**

Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas that can be ...
*December 8, 2014*

**Physics 1**

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 17π radians, the angular speed is 18π rad/s. (a) What is the magnitude of the angular acceleration? answer in rad/s2 (b) How much...
*October 2, 2014*

**physics**

a) What was the pebble's initial speed (just after leaving the slingshot)? b) How much time did it take for the pebble to first reach a height of 14.5 m above its launch point?
*September 22, 2014*

**physics**

A boy uses a slingshot to launch a pebble straight up into the air. The pebble reaches a height of 29.0 m above the launch point 3.3 seconds later. Assume air resistance is negligible.
*September 22, 2014*

**Algebra**

actually you have placed the brackets in wrong. 12(4)+7 BECOMES: 12*4+7 You said that you place the brackets like this: 12* (4+7) However, B.I.D.M.A.S: (Multiply comes before add) so.. the brackets actually go like this: (12*4)+7 giving you 55 (if you don't belive me go ...
*August 24, 2014*

**Algebra**

Hiya, i read through this and 132 isn't the answer. you need to do B.I.D.M.A.S so... simplify 12(6^/ (5^-4^))+7 12(6^/ (25-16))+7 12(6^/ (9))+7 12(36/ (9))+7 12(36/9)+7 12(4)+7 (12 x 4)+7 (48)+7 48+7=55 ANSWER=55
*August 24, 2014*

**Calculus Help**

t and w(t) are a table with corresponding values. (100,2.6), (110,7.3), (120,12.7), (130,19), (140,26.1), (150,34.1)
*July 3, 2014*

**Calculus Help**

Based on the following table of values for the function w(t), answer the questions below. t= 100 110 120 130 140 150 w(t)= 2.6 7.3 12.7 19 26.1 34.1 a) Which of the following best describes the derivative of w(t)? A. changes sign B. always positive C. always negative b) Which ...
*July 3, 2014*

**Science**

Name 3 examples of how an abiotic factor could negatively impact an ecosystem:
*June 1, 2014*

**Chemistry**

The formation constant of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.31 M NaCN solution. What is the concentration of M2 ions at equilibrium?
*May 6, 2014*

**Physics**

A 6.2 kg model rocket is traveling horizontally and due south with a speed of 20.3 m/s when it explodes into two pieces. The velocity of one piece, with a mass of 1.6 kg, is v1 = (-12 m/s)i + (30 m/s)j + (15 m/s)k, with i pointing due east, j pointing due north, and k pointing...
*February 24, 2014*

**Maths**

factorise 5x^2+8x-6 please help... will be much appriciated.
*February 22, 2014*

**Maths**

thankyou so much!
*February 16, 2014*

**Maths**

Solve and show workings 3√/9 *27√ It's supose to be the square root of 3 over 9 time the quare root of 27. i know the answer is 1 however i don't know how to get that answer. Any help would be appriciated. Thanks
*February 16, 2014*

**Pyshics**

What effect does the component of force parallel to a bicycle crank have?
*October 9, 2013*

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it
*October 9, 2013*

**Physics**

I need to explain and demonstrate mathematically why it is easier to pull a wheelbarrow than it is to push it
*October 9, 2013*

**Physics**

I need to know whether the position of the CG is higher, lower, or at the same level within the body when a person is standing up as when a person is lying down? Why or why not?
*October 9, 2013*

**Physics**

I need to know whether the position of the CG is higher, lower, or at the same level within the body when a person is standing up as when a person is lying down? Why or why not?
*October 9, 2013*

**8 th grade math**

Need help working out how to get Adding, Subtracting , Division , and multiplying of the integer 34
*September 10, 2013*

**physics**

I need to calculate the horizontal, vertical and resultant velocity of a ball thrown a distance of 8.23m in a time of 1.73sec (assuming the ball lands at the same height from which it is thrown). The angle of the throw is unknown. Please help!
*August 25, 2013*

**Microeconomics**

Producing paper creates pollution. The efficient quantity of paper is when the A. marginal social benefit of paper is equal to zero. B. marginal social cost of the pollution from making paper is equal to zero. C. marginal social of paper is equal to the marginal social cost of...
*August 5, 2013*

**Chemistry**

Thank you for clearing that up!
*August 5, 2013*

**Chemistry**

Select the true statement below. A. a spontaneous redox reaction equation will have the stronger oxidizer and stronger reducer as products B. a salt bridge should contain ions that will participate in the redox reaction C. in a voltaic cell, the difference in chemical ...
*August 5, 2013*

**Chemistry**

Thank you for your explanation! I knew the first three were right but didn't know exactly why. I was confused with the last two. Thanks again!
*July 30, 2013*

**Chemistry**

I'm confused with redox rxns in general and how to tell if it's a strong oxidizing/reducing agent.
*July 30, 2013*

**Chemistry**

Consider the following reaction and select the false statement below. NaI + 3HOCl → NaIO3 + 3HCl A. HOCl is the oxidizing agent B. Cl is reduced C. NaI is the reducing agent D. If ΔG° for the reaction is < 0, then NaI is a stronger reducing agent than HCl E. ...
*July 30, 2013*

**Chemistry**

Thanks got it!
*July 24, 2013*

**Chemistry**

A container is filled with CO2(g) and heated to 1000K. The gas pressure at this temperature is 0.50 atm. Graphite (C) is then added to the container and some of the CO2 is converted to CO according to the reaction below. The final equilibrium total gas pressure in the flask is...
*July 24, 2013*

**physics**

56000
*July 19, 2013*

**Chemistry**

Thank you for the explanation!
*July 17, 2013*

**Chemistry**

Thanks, I got the answer 8.95. So why do I not need to divide the mmols by the total volume?
*July 17, 2013*

**Chemistry**

A 10.0 mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the addition of 20.0 mL of the HCl solution. (potentially useful info: Ka of NH4+ = 5.6 x 10−10)
*July 17, 2013*

**math**

I have the problem ((square root of h^2+4h+5)-(square root of 5))/h. I am supposed to be finding the limit as h approaches 0 from the right. We are supposed to solve it algebraically and I believe I should be using a the conjugate but I am not exactly sure how to set it up, ...
*July 9, 2013*

**Chemistry**

Nevermind! I realized I was multiplying by the CN- molar mass instead of KCN.
*July 9, 2013*

**Chemistry**

Calculate the mass (in mg) of KCN needed to make 500. mL of aqueous KCN solution with a pH of 10.00. The Ka of HCN = 5.0 x 10-10. I got the answer 7.8 mg but it's wrong. Can someone please explain how to do it?
*July 9, 2013*

**Chemistry**

I reworked the problem and realized I didn't find Kb at first and plugged in Ka instead. Thanks!
*July 6, 2013*

**Chemistry**

What would be the pH of a 0.1 M aqueous solution of the phenolate ion, C6H5O–? (Ka for phenol, C6H5OH, is 1.3 x 10–10) I got the answer 5.44 but I think it's wrong. Do I have to subtract it from 14?
*July 6, 2013*

**Chemistry**

Oh I see what I did wrong! I got the answer 3.75. Thanks for the help!
*July 5, 2013*

**Chemistry**

The pH of a 0.10 M solution of a certain acid is 3.25 at 25°C. What is the pH of a 0.010 M solution of the same acid at the same temperature?
*July 5, 2013*

**Chemistry**

The pH of a 0.10 M solution of a certain acid is 3.25 at 25°C. What is the pH of a 0.010 M solution of the same acid at the same temperature?
*July 5, 2013*

**Chemistry**

The pH of a 0.10 M solution of a certain acid is 3.25 at 25°C. What is the pH of a 0.010 M solution of the same acid at the same temperature?
*July 5, 2013*

**Calculus**

Find the Taylor Polynomial of order 1 for the function f(x)=arctan(x/5) in powers of (x-5). Also find the remainder R1(x) as a function of x and c.
*June 19, 2013*

**chemistry**

the concentration of urea (MW=60.0g/mol) in a soltuion prepared by dissolving 16g of urea in 39g of H2O is ____ molal
*February 21, 2013*

**math**

Find the number to which this geometric series converges: 200-170+144.5...
*May 2, 2012*

**business law**

1. Meyer, after seeing a sign on Chosnyka's land reading "FOR SALE 95 ACRES" and running a title search, sent Chosnyka an offer to buy the land as described by its legal description. The offer required acceptance by returning a singed copy within 10 days. ...
*March 18, 2012*

**marketing**

a 1,400- to 1,750-word paper in which you describe the elements of the marketing mix (product, place, price, and promotion). Use at least 3 academic sources (non-academic sources or text materials will not be counted) to support your work. In addition, select an organization ...
*March 5, 2012*

**science**

why don't hydrocarbons have hydrogen bonding?
*February 26, 2012*

**Math**

Construct R3, S2 and S º 3, by supposing R and S are relations on {a,b,c,d), where R={(a,b),(a,d),(b,c),(c,c),(d,a)} and S = {(a,c), (b,d)(d,a)}.
*November 18, 2011*

**Math**

Using the ordinary alphabet and allowing repeated letters, find the number of words of length 8 that begin and end with T.
*October 30, 2011*

**math**

a+3a=36
*October 5, 2011*

**chemistry**

phenol is insoluble in NNAHCO3 solution while acetic acid is soluble.give reason.
*July 14, 2011*

**science**

What is an Atom
*May 9, 2011*

**chemistry**

what mass of X can be dissolved in 35.0 grams of water at 20 degrees centigrate?
*March 12, 2011*

**math**

it between 1-10 it more for 1 and less for 10
*February 24, 2011*

**science**

scientific notation of 83.1
*February 6, 2011*

**Calculus**

find the vertical asymptotes of the graph of the function g(x) = (4+X)/(X^2 (9-XX)
*February 3, 2011*

**math**

about 320 (that is the question)
*January 25, 2011*

**math**

write the question for the answer below. about 320
*January 25, 2011*

**MATH**

Rectangle ABCD is similar to rectangle WYYZ. Uf tge the area of rectangle ABCD is 90 square inches, what is the area of rectangle WXYZ?
*January 20, 2011*

**math**

thank u
*January 19, 2011*

**math**

mystery numbers A = B + 5 B = C + 7 C = THE DIFFERENCE BETWEEN 13 AND 9 D = A - B
*January 19, 2011*

**methods of sbtracting mixed fractions**

23/6 convert to a mix number
*December 20, 2010*

**physics**

for part a) F=(Pressure)*(Area) F=[(rho)(g)(d)]*(Area) where d is the distance of the tube beneath the surface of the water, and area is the cross sectional area of the tube, and rho the density of water. make sure to convert the units of the diameter into cm before subbing it...
*December 6, 2010*

**MATH HOMEWORK**

62.8
*December 1, 2010*

**MATH HOMEWORK**

Find the circle circumference and circle area with a circles radius 10 inches I think the circles are is 314 but don't know the circumference.
*December 1, 2010*

**Chemistry**

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three 50 ml extractions ...
*November 22, 2010*

**Chemistry**

You have 150 ml of a solution of benzoic acid in water estimated to contain about 5 g of acid. The distribution coefficient of benzoic acid in benzene and water is approx 10. Calculate the amount of acid that would be left in the water solution after three 50 ml extractions ...
*November 22, 2010*

**math**

distribute the 4. 1/6 + 8/5 - 28/10 then find Least Common Denominator. which would be 30. (5/5)(1/6) + (6/6)(8/5) - (3/3)(28/10) 5/30 + 48/30 - 84/30 solve
*November 18, 2010*

**physics**

11.11
*November 6, 2010*

**Business**

I need to find out what the minimum wage is in Denmark - preferably in the brewery sector. Need help asap
*November 6, 2010*

**social studies**

thankx
*October 19, 2010*

**social studies**

how many state were on the us flag in 1950?
*October 19, 2010*

**math 12**

log6=x and log8=y, determine an expression for log3 in terms of x an y.
*October 3, 2010*

**Math**

h(x)= -24-4x+5 = -4x-19
*October 3, 2010*

**math**

what is value of 7 in each number 127 473
*September 27, 2010*

**Elements of Psychology**

She is correct ^^^
*September 16, 2010*

**Chem**

Hello, In the addition of water to an alkene (e.g. ethylene) what is the electrophile? Well I thought its the hydrogen cation from the water. Since electrophiles are electron poor molecules, having a tendency for more electrons. But then it asks what nucleophile is present in ...
*July 22, 2010*

**Chemistry**

Hello, What is the hybridization of an H atom on a methane? As far as I understand, the hydrogen has 1 s orbital which bonds only to carbon, so does not have any hybridization. Is this correct? Thank you
*July 15, 2010*

**Pythagorean Theorem**

Draw the problem out, with a ladder leaning against the wall, and label the respective lengths. You will notice it forms a right-angle triangle, with the ladder as the hypotenuse. So the theorem is a^2+b^2 =c^2 where c represents the ladder length (the hypotenuse), and so a ...
*July 15, 2010*

**9th grade**

Like I said in your other question, try to draw out the triangle, it will help. Remember hypotenuse is always the longest side in a right-angle triangle, and easy way to know which one it is, is that it is the slanting one, the slope opposite the right angle. Then all you have...
*July 15, 2010*

**Math 9th grade**

x^2 + 5x +6/ x^2 - 3x -10 How do I do this? Is it asking me to divide? The answer choices are as following: A)x + 3/ x - 5 , x ≠ 5 B)x + 3/ x - 5 , x ≠ -2, 5 C)x2 + 5x + 6/ x - 5 , x ≠ 5 D)x2 + 5x + 6/ x - 5 , x ≠ -2, 5
*May 4, 2010*

**writing**

i need help finding a title for my paper. im writing it about my relationship to a place and i wrote it about my relationship to this small town in new york. i talked about a creek and horse races and how its my second home, but i cant think of a creative title. any ideas? ...
*April 15, 2010*

**history**

I'm doing an essay on Roosevelt's New Deal, and i'm supposed to do it from a present perspective, keeping in mind the recent conservatism of the last few presidents. I have my own opinions on it, but how would the conservatives now a days view the new deal? what ...
*April 12, 2010*

**scott**

during the relative refactory peroid another impulse can be triggered by a ?
*March 21, 2010*

**english**

I am trying to find out how many copies of the novel "Brave New World" by Aldous Huxley have been sold worldwide or even in Australia. I can't find the statistics anywhere. Can someone please help??
*March 4, 2010*

**physics**

In Figure P4.30, m1 = 10.5 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60 while the coefficient of kinetic friction is 0.30. Figure P4.30
*February 21, 2010*

**cpcc**

Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a θ = 45.0° angle relative to the forward motion of the boat. If the boat moves with constant velocity, find the resistive force vector F exerted by the water ...
*February 20, 2010*

**math**

y=(x+3)(x-1)
*November 7, 2009*

**French help **

Le nouveau président des États-Unis est pour la première fois une personne de couleur.Ce n'est pas la seule différence que Barack Obama possède, il est également jeune et veut ouvrir les lignes de communications de nouveau avec les...
*October 17, 2009*

**Math**

For y = a sin x 'a' is called the amplitude. What effect does 'a' have on a graph ??? Please help if you can .
*October 9, 2009*

**math**

write a word problem for 1/2 - 2/3 = and write a word problem for 5/12 - 1/3 =
*August 28, 2009*

**Math**

without finding the exact answer select which of the following numbers is the best estimate of each sum or difference and justify your choices: - 2/3, 0, 2/3 1/9 + 2/5 - 1/3 - 3/4
*August 28, 2009*

**English**

I am trying to find an analysis of Oodgeroo Noonuccal's (formerly Kath Walker) poem "No More Boomerang." All i desperately need is the year it was written if you can't find a full analysis. I have looked everywhere. Please help.
*August 22, 2009*

**Physics**

In stars, nucleons (protons and neutrons) form nuclei of atoms via a series of fusion reactions. If for a particular fusion reaction more energy is given off than is required to make it proceed, does the final nucleus have a higher or lower rest mass than the sum of the rest ...
*May 9, 2009*

**physics**

will I be able to calculate the momentum if I know the mass of the proton?
*May 9, 2009*

**physics**

What is the momentum of a proton travelling at v = 0.95c in the x-direction in the reference frame?
*May 9, 2009*

**Maths**

Hi can anyone help me with this? 20^2 x 8^4 x 125 (x meaning multiply) I have to write in the simplest index notation. Is there a trick to rewriting the bases in terms of their prime factors? Or is it all trial and error until you come up with the right combination of numbers...
*April 30, 2009*

**chemistry!**

how could i use 13Cn.m.r spectroscopy to distinguish between the ketone and the alcohol?
*April 29, 2009*