Tutorials Posted by topquark

topquark from Durham University

topquark
topquark
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Bounty Category Question Tutorial Purchases Date Posted
$0.50 Mathematics circles correct answer with explanation
...circle, and c = radius For this ci...		 May. 14, 2012 at 09:20:32AM
$0.50 General-Questions PHYSICS 2 MULTIPLE CHOICES Correct answers
...   Questio...		 May. 14, 2012 at 09:16:14AM
$10.00 General-Questions GS103 Correct answers with explanations
...d up" due to the train moving forwards as it emits the waves. The result would be a shorter wavelength and therefore a higher frequency. As the train moves away, the frequency is decreased because......		 Aug. 23, 2011 at 05:24:36AM
$1.00 Mathematics Determine if f and g are inverse functions correct solution with working
...then f(x) and g(x) are inverses of each other.   1.  y=3x. Â...		 Jul. 03, 2011 at 07:34:04AM
$1.00 Mathematics Verify that the two given functions are inverses (4Q's) correct solutions with working
... x^3 + 1. g(y) = cubedroot(y-1) = cubedroot(x^3+1-1) = cubedroot(x^3) = x 3. Let y = f(x) = 1/(x...		 Jul. 03, 2011 at 07:30:25AM
$1.00 Mathematics solve the following quadratic equation b Full solution with working
... (3±sqrt(9+16))/6 = (3±5)/6 so solutions are x=4/3, x=-1/3 3. the discri...		 Jun 18, 2011 at 12:27:07PM
$1.50 Business need help asap please A+ answer
...e, accounting is performing as a language. All languages have rules which must be obeyed and understood by all speakers of the language. This is important so that everyone using the language......		 Jun 16, 2011 at 7:48:44PM
$1.00 Chemistry Reaction answer with explanation
...ubstance that...		 Jun 16, 2011 at 4:34:54PM
$1.00 Chemistry Balance equation balanced equation
...H2CO3 ...		 Jun 16, 2011 at 4:32:56PM
$1.00 Chemistry Acidic answer
...H less...		 Jun 16, 2011 at 4:31:53PM
$1.00 Chemistry Balanced equation balanced equation
...+ NaO...		 Jun 16, 2011 at 4:29:48PM
$1.00 Chemistry Buffer answer
...he we...		 Jun 16, 2011 at 4:24:06PM
$1.00 Chemistry Caculate answer
...The a...		 Jun 16, 2011 at 4:21:24PM
$1.00 Chemistry Soltuion answer with explanation
...hing with pOH g...		 Jun 16, 2011 at 4:19:52PM
$1.00 Chemistry Calculate thepOH of the solution solution with explanation
...= -log[H+] which can be inverted to give the equation:  [H+] ...		 Jun 16, 2011 at 4:17:58PM
$1.00 Chemistry Reaction answer with explanation
...onjugate base .  It absorbs, or g...		 Jun 16, 2011 at 4:13:10PM
$1.00 Chemistry pH solution solution with working
...3 x 10^-...		 Jun 16, 2011 at 4:11:28PM
$1.00 Chemistry Reaction answer with explanation
... in the  forward  chemica...		 Jun 16, 2011 at 4:10:04PM
$1.00 Chemistry Reaction answer with explanation
... the substance...		 Jun 16, 2011 at 4:08:19PM
$1.00 Chemistry reaction that occurs when you add NH3 answer with explanation
... Because it's a weak base,...		 Jun 16, 2011 at 4:06:47PM
$1.00 Chemistry Balanced equation balanced equation
...>  Na3...		 Jun 16, 2011 at 4:04:40PM
$1.00 Chemistry Calculate the molarity solution with working
...of atomic weights of Na and Cl (from periodic table) = 22.99 + 35...		 Jun 16, 2011 at 4:01:52PM
$1.00 Chemistry NH3 exhibits hydrogen bonding answer with explanation
...ghly electronegative so pulls negative charge towards it, creating a ...		 Jun 16, 2011 at 3:55:18PM
$1.00 Chemistry Reaction answer with explanation
...(aq) + NO3-(aq) HNO3 is a strong acid, ...		 Jun 16, 2011 at 3:50:21PM
$1.00 Chemistry Concentration solution with working
...mL )*100 = 16.3/1...		 Jun 16, 2011 at 3:46:35PM
$1.00 Chemistry Bonding answer with explanation
...t not hydrogen bonding because Br is no...		 Jun 16, 2011 at 3:41:57PM
$1.00 Chemistry Chloromethane (CH3Cl) answer with explanation
...ve so pulls the electron...		 Jun 16, 2011 at 3:39:32PM
$1.00 Chemistry solution of 1M NaCl answer with explanation
... proportional to the number of solute particles. Each ...		 Jun 16, 2011 at 3:36:22PM
$1.00 Chemistry Electrolytes answer
.... A weak electrolyt...		 Jun 16, 2011 at 3:32:07PM
$1.00 Chemistry solution of NaCl answer with explanation
...number of ions that are present in the solution, the higher the boiling point. ...		 Jun 16, 2011 at 3:30:31PM
$1.00 Chemistry Boiling point of methanol answer with explanation
...stronger intermolecular forces have higher boiling...		 Jun 16, 2011 at 3:21:07PM
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...ff" 20. (d) ...		 Jun 15, 2011 at 7:10:23PM
$1.00 Psychology For a population that has a standard dev Standard deviation of the distribution of means - A+ answer
...ribution of means = standard deviation ...		 Jun 08, 2011 at 3:43:44PM
$1.00 Chemistry Function as a buffer solution explanation
...ate base (eg. CH3COONa).  HNO3 is a strong acid.  A strong acid can't be used as a...		 Jun 08, 2011 at 3:35:25PM
$1.00 Chemistry Balanced equation for the reaction solution
...ffer (CH3COOH) reacts w...		 Jun 08, 2011 at 3:27:37PM
$1.00 Chemistry Balanced equation for the reaction solution
... CH3COO - that are pr...		 Jun 08, 2011 at 3:21:51PM
$1.00 Chemistry Buffer solution solution with explanation
...hen the buffer pairs dissolve in water, the following ions ar...		 Jun 08, 2011 at 3:16:05PM
$1.00 Chemistry Solution explanation
... a higher concentration of HCN an...		 Jun. 07, 2011 at 05:57:33AM
$1.00 Chemistry Lady Reactsalot adds a small amount of HCl explanation of buffers
...ution to make H + + Cl -, so raising the concentration of H + in the solution. But in t...		 Jun. 07, 2011 at 05:53:35AM
$1.00 Chemistry pOH of the solution solution with working
...  base pH   1 ------------7-----------14 p0H 14------------7------...		 Jun. 07, 2011 at 05:40:33AM
$1.00 Chemistry Buffer solution solution with explanation
... ions.  In water, HCN reacts as follows: HCN + H...		 Jun. 07, 2011 at 05:34:18AM
$1.00 Chemistry buffer solution solution with explanation
...N and NaCN in water to make a buffer so...		 Jun. 07, 2011 at 05:30:06AM
$1.00 Chemistry Neutral, basic or acidic solution with explanation
...re than 7 is acidic, exactly ...		 Jun. 07, 2011 at 05:19:38AM
$1.00 Chemistry Caculate solution with working
... pOH = - log[OH-] = - lo...		 Jun. 07, 2011 at 05:17:11AM
$1.00 Chemistry Solution solution with explanation
...m the last question, the pH of this s...		 Jun. 07, 2011 at 05:15:17AM
$1.00 Chemistry Caclulate the pH solution solution with working
....2 x 10^-5 M so pH...		 Jun. 07, 2011 at 05:13:06AM
$1.00 Chemistry Acid and Base solution with explanation
...)^-1 is the base because it...		 Jun. 07, 2011 at 04:22:42AM
$1.00 Chemistry Balanced equation solution with explanation
... leaving OH -1 .  The equation is balanced because charg...		 Jun. 07, 2011 at 04:18:08AM
$1.00 Chemistry Solution explanation
... adding 15 mL of NaCl to 85 mL of water will have a volume of less than 100 mL, because NaCl solution is more dense than water. When you dis...		 Jun 03, 2011 at 7:07:19PM
$3.00 Chemistry Theoretical value – Experimental value solution
...solution which has 3.5 g NaCl per 100ml of solution(3.5 % w/v), there is 30 mL x (3.5 g)/(100 mL) = 1.05 g of NaCl CHECKED - THIS IS CORRECT iv. How does the actual weight (the experimental value......		 Jun 03, 2011 at 6:22:23PM
$3.00 Chemistry Part D: Dilution a) Sometimes, instead of preparing a solution from... solution
...o prepare 35.0 mL of 0.450 M NaCl solution using 0.75 M NaCl solution. Step 1: Let's calculate ...		 Jun 03, 2011 at 3:22:59PM
$3.00 Chemistry Part C: Molarity a) Suppose you were asked to prepare 135.0 mL of a 0.780 M... solution
...= 0.105 moles of NaCl  0.105 mol. x (58.5 g / 1 mol NaCl) = 6.14 g NaCl The method for preparing the solution would be to weigh 6.14 g of NaCl, put it into a graduated cylinder, then add water to......		 Jun 03, 2011 at 3:15:20PM
$3.00 Chemistry Percent by Weight/Weight solution
...d 132.0 g of DI water for a total of 150.0 g of solution. b) Don’t prepare the above solution. Instead, using the same conceptual process, prepare 40.0 g of a 9.0 % w/w NaCl solution. Write...		 Jun 03, 2011 at 3:08:03PM
$3.00 Chemistry Percent Weight/Volume (%w/v) solution
...ion: step 1   To prepare 46.0 mL of a solution which has 3.5 g NaCl per 100ml of solution(3.5 % w/...		 Jun 03, 2011 at 2:47:45PM
$1.00 Mathematics Sales of portable MP3 players grew appr solution step by step
...2, there is an increase of 8x on the previous year's sales, so sales in 2000 are 0.05 billion + x + 2x + 4x In 2003, there is an increase of 16x on the previous year's sales, so sales in...		 May 31, 2011 at 5:18:25PM
$1.00 Chemistry heat needed to vaporize solution with working
...zation (in cal/g) * gr...		 May 31, 2011 at 4:17:13PM
$1.00 Chemistry molarity of your diluted solution solution with working
... so number of moles of NaOH = volume * molarity = 0.09628 ...		 May 31, 2011 at 4:15:57PM
$1.00 Chemistry What’s the molarity of your diluted solution solution with working
...ss of K + molar mass of Cl = 39.10 + 35.45 = 74.55 (got molar masses of K and Cl fro...		 May 31, 2011 at 4:12:26PM
$1.00 Chemistry % w/v of the original solution solution with working
... I checked the definition of % w/v and it definitely says that % w/v = grams of solute/mL of...		 May 31, 2011 at 4:05:45PM
$1.00 Chemistry concentration of this solution solution with working
...l of 2.2 % w/v NaCl conta...		 May. 28, 2011 at 05:59:09AM
$1.00 Chemistry molarity solution with working
...M", 1M = 1 mol/litre 2.34 moles of sugar ...		 May. 28, 2011 at 05:44:25AM
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...ed hat," Peter said sadly. sadly = adverb, lucky, red = adjectives, I = pronoun John lovingly polished the silv...		 May 27, 2011 at 12:46:31PM
$1.00 Chemistry Classify the propertiy as physical or chemical Iron melts at 1535 degree... correct answer with explanation
...al state of the material whereas a che...		 May 27, 2011 at 12:30:59PM
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... of a person's job or workplace exceeds the individual's ability to meet those demands.  Overloading an employee with work is a major cause of occupational stress.  It can also be caused by an......		 May 27, 2011 at 12:27:09PM
$1.00 Mathematics any pair of consecutive digits of a five solution with explanation
...or 4X (where X is any digit) 7 is one of the 5 digits, so "17" must appear in the 5 digit number.  However, there is no multiple of 17 which i...		 May. 27, 2011 at 09:03:14AM
$2.00 Economics Determine if the demand for the followin detailed answers
...ve). c. It depends whether there are competing gas stations nearby.  If not, then it is price inelastic.  If so, local people will buy from competitors instead so the elasticity increases. d.  Price......		 May. 26, 2011 at 09:01:58AM
$1.00 Mathematics Sales of portable MP3 players grew appr solution with working
...se in sales the previous year. i.e. in 1999 there is an increase of x on the previous year's sales, so sales in 1999 are 0.05 billion + x....		 May. 26, 2011 at 08:42:42AM
$0.25 Mathematics Complete the equation of the line L... solution
... b0 = 0...		 May 25, 2011 at 5:02:35PM
$1.00 Mathematics Sales of portable MP3 players grew appr solution step by step
...that every year the increase in sales is double the increase in sales the previous year. i.e. in 1999 there is an increase of x on the pre...		 May 25, 2011 at 5:00:51PM
$1.00 Mathematics Evaluate the expression for the given values of x and y solution with working
... 7-10/...		 May 25, 2011 at 4:48:01PM
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...re di  co...		 May. 23, 2011 at 04:14:12AM
$2.50 Economics If elasticity of demand is .2, elasticity of supply is 5, and a 10% excise tax is levied on the good. 2 Multiple Choice answers with detailed explanations
...ket price of the good. When elasticity of demand is zero, consumers have no alternative to purchasing the good or service if the price increases, so the quantity demanded would remain constant.......		 May 22, 2011 at 3:01:18PM
$1.00 English WHAT IS AN ADJECTIVE AND IS THERE A TRIC explanation of adjectives
...before the noun. Example: The old man sat on the bench. Here the adjective is "old".  It ...		 May 19, 2011 at 5:22:41PM
$0.25 Mathematics Calculate the y value for the given x va solution with working
... y=3x+2 = 3*...		 May 19, 2011 at 5:17:50PM
$3.00 Mathematics Help me with this please solutions with explanation
... "is less than or equal to" 2x-2 ≤ 4x-4 Subtract 2x-4 from each side, to get 2 ≤ 2x Divide each side by 2 to get  0 ≤ x  or equivalent...		 May 19, 2011 at 5:08:20PM
$1.00 Chemistry How many moles of sodium hydroxide, NaOH, are needed to make a6 liters of a 6M... solution with working
...6 moles per litre. So to mak...		 May 19, 2011 at 4:26:03PM
$1.00 Mathematics If x*x + 2x - 35 = 0, then x = ? solution with working
...e factorised to give  (x+7)(x-...		 May 19, 2011 at 4:23:17PM
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...h of base of...		 May 19, 2011 at 1:46:25PM
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...ide 1 + length of side2 + length of ...		 May 19, 2011 at 1:30:07PM
$0.25 Mathematics A vending machine sells chips at... solution with working
...sold   x+y=328 40x+50y=15280 ...		 May. 19, 2011 at 09:48:34AM
$1.00 Mathematics For each function graphed below, state whether it is one-to-one or not. Answer left to right for graphs 1 thru 6. solutions and definition of one-to-one function
... Bottom row, from left to right: No, Yes, Yes  ...		 May. 19, 2011 at 09:19:41AM
$1.00 English What does it mean to have self disciplin explanation of self-discipline
...ipline means having the ability to make ...		 May. 19, 2011 at 08:36:05AM
$1.00 Mathematics If x*x + 2x - 35 = 0, then x = ? correct solution with working
... = 0 This can be ...		 May. 19, 2011 at 07:15:17AM
$1.00 Mathematics complex number solution with detailed explanation
...= -1 * i = -i i^4 = (i^2)^2 = (-1)^2 = 1 i^5 = i^4 * i = 1 * i = i So, i^5 = i^1, which means that i...		 May. 19, 2011 at 07:04:43AM
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...2) = 1*(36 + 30 + 25) = 91 #36 Substitut...		 May. 19, 2011 at 06:54:34AM
$0.25 Geography What is the capital of Alabama? Capital of Alabama
...a is Mo...		 May. 19, 2011 at 04:51:08AM
$0.25 Mathematics algebra Simple answer
...t divide $32,400 by 5...		 May. 18, 2011 at 11:40:15AM
$0.25 Mathematics Boyle's Law says that the volume of a... solution with working
...= k/p where k is som...		 May. 10, 2011 at 06:59:04AM
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...- P(A-B) ...		 May 09, 2011 at 5:13:09PM
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...e mutually e...		 May 09, 2011 at 4:32:37PM
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... 1+2+4+8+16+32+6...		 May 09, 2011 at 2:10:37PM
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...owels.  there are...		 May 09, 2011 at 1:54:28PM
$1.00 Mathematics A jet takes 5 hours to travel a distance of 4000 miles against the wind. The return trip takes 4 hours with the wind. Wh solution step by step
... = v-w  = distance/time = 4000/5 = 800 mi/h Add the equations ...		 May 09, 2011 at 1:53:14PM
$1.00 Mathematics Solve the System: 3x-y+z=3 -x+y+2z=0 -5x+3y+2z=-2 I want to double... solution step by step
... (x-2x+1)/2 = 3 Solve this for x: 3x - 2x + 1 - x/2 + 1/2 = 3 x/2 = 3/2 x=3. I...		 May 09, 2011 at 1:47:09PM
$1.00 Mathematics College Algebra Word Problem solution with working step by step
...og(0.70) = 6.72 After 6.72 years the laptop is worth $100.00.  The question asks for a w...		 May 09, 2011 at 12:07:21PM
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... of the cards are spades.  4 of the cards are kin...		 May. 09, 2011 at 11:29:31AM
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...= hubble constant, D = d...		 Apr. 05, 2011 at 10:37:36AM
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...r midnight = 6 hours and 17 minutes.  Time: 6.17 am (d)  7.05 am is 7 hour and 5 minutes = 425 minutes after midnight. d=arcsin((t-430)/75)*180/pi+70 which ha...		 Apr. 04, 2011 at 06:23:12AM
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...to know what to do, but you soon pick it up.  I...		 Mar. 31, 2011 at 07:03:06AM
$0.80 Mathematics need help solve for variable 5x=-35 solution with working
...ides by ...		 Mar. 27, 2011 at 10:34:51AM
$3.00 Mathematics Please help me understand this Probability Question detailed tutorial on arranging objects in a line
...s can be arranged in is 7! = 7*6*5*4*3*2*1.  To see this, consider 2 objects A and B.  There are obviously only 2 ways you can arrange them: AB or BA. If you add a third object, there are now 3x2......		 Mar. 27, 2011 at 10:04:13AM
$1.00 Mathematics Algebra solution with explanation
...er values of x.  Therefore, the min...		 Mar 25, 2011 at 2:37:17PM
$0.25 Mathematics use the square root property to solve the equation. (x+4)^2=25 The... correct solution
...tion set is...		 Mar 24, 2011 at 5:21:59PM
$0.25 Mathematics Solve the equation by the square root property. 6x^2-5=0 The solution... correct solution
...{-sqrt(...		 Mar 24, 2011 at 5:20:30PM
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...s possible....		 Mar. 24, 2011 at 09:00:26AM
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...some cases left over * number of cases left over * manufacturing cost per case Expected earnings if Ortega manufac...		 Mar. 24, 2011 at 08:12:36AM
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... the unknown qua...		 Mar. 24, 2011 at 05:09:55AM
$1.50 Mathematics On September 17, 2001 the Dow Jones Indu solution with working
...y 7.13% on 17 Sep 2001.   38 as a percentage of...		 Mar 22, 2011 at 5:57:48PM
$0.50 Mathematics joe has a collection of nickels and dimes that is worth 5.30. If the number of... solution with working
...mber of dimes be x let number of nickels be y 10...		 Mar 21, 2011 at 12:33:59PM
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...kgK Q = mC(Tfinal-Tinitial)   rearrang...		 Mar. 21, 2011 at 09:52:38AM
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...e se...		 Mar. 21, 2011 at 09:47:51AM
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...ect ...		 Mar 20, 2011 at 1:15:09PM
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...corr...		 Mar 20, 2011 at 1:09:16PM
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...money transferred out Therefore...		 Mar 20, 2011 at 1:08:20PM
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...r = 4r(tsq...		 Mar. 20, 2011 at 04:29:59AM
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...n = P(A)P(B)P(C)P(D) = 1/(50*60*75*4...		 Mar. 19, 2011 at 04:41:57AM
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...ail x probability of tail = 0.5 * 0.5 * 0.5 * 0.5 * 0.5 = 0.5...		 Mar. 19, 2011 at 04:26:38AM
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...s solved problem one, 60% solved proble...		 Mar. 17, 2011 at 10:08:40AM
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...ck 2 is 380-x = 50t Equate expressions for x:...		 Mar. 16, 2011 at 11:02:51AM
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...much bigger than the constant terms and the terms which are proportional to n.  So...		 Mar 15, 2011 at 4:16:22PM
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...hange the base of the logarithm: x = ln(y) = ...		 Mar 15, 2011 at 4:09:43PM
$1.00 Mathematics Logarithm question 1. perfect solution with working
...n  x 0 y n where n Ck  = n!/(k!(n-k)!) is the number of ways of choosing k objects from n an...		 Mar 15, 2011 at 4:04:36PM
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...s Strain is defined as elongation/length.  Stress is defined as force/area.   The stress which is being applied to this bar...		 Mar 15, 2011 at 3:52:35PM
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...elect, or to change their mind and choose the other door instead.  The optimal strategy is for the contestant to change their mind and pick the door which they did not originally select.  To see why......		 Mar. 15, 2011 at 08:55:15AM
$1.00 Psychology Can we infer causality when there is a correlation? If anxiety and depression... solution with explanation
... imply causation.  If anxiety and depression are correlated, this may mea...		 Mar. 15, 2011 at 03:53:04AM
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... 2 * 15/4 ...		 Mar 14, 2011 at 7:38:01PM
$15.00 Engineering 20 higher order equation questions. full set of correct solutions
... y=27, x^3=27 has root x=3.  Other solution y=1, x^3=1 has root x=1. 4.  (3) 5.  (5) 6.  (4)  (x=2 is a solution) 7.  (5)  (x=5 is a solution) 8.  (2...		 Mar 06, 2011 at 8:22:06PM
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...formance report is a report that compares t...		 Mar 06, 2011 at 4:22:15PM
$1.00 Mathematics A FAMILY HAS THREE CHILDREN - TWO OF THE solution with working
...x. Age of other child = y where y x*x*y = 36. Factors of 36...		 Mar. 03, 2011 at 08:24:15AM
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...ts).  there are 3 students.  ...		 Mar 02, 2011 at 1:44:34PM
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... you to subtract 6 from the number repre...		 Mar 02, 2011 at 1:32:06PM
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....0926 moles of Al2O3.   b.   number of moles of 3NO2 = 20/(14.07+2*16) = 0.434 number of moles of H2O = 20/(1.08*2+16) = 1.101 3 moles of NO2 + 1 moles of H2O would make 2 moles of HNO2. 0.434/3......		 Mar 02, 2011 at 1:06:58PM
$1.00 Chemistry limiting reactant solution with working
...need 3/4 as much O2 as Fe for the reaction to take place. a. 1.5 moles Fe would react with (3/4)*1.5 = 1.125 m...		 Mar 02, 2011 at 12:47:22PM
$1.00 Chemistry Calcium and nitrogen react to form calcium nitride 3Ca(s) + N2 (g) ---- Ca3N2(... step by step solution
...t of calcium = 40.078; molar weight of nitrogen = 14.0067; therefore molar weight of Ca3N2 = 40.078*3 + 14.0067*2 = 148.2474 Number of ...		 Mar 02, 2011 at 12:23:22PM
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...s 136 from each side: 2x = -13...		 Mar 02, 2011 at 12:14:22PM
$0.50 Mathematics at the beginning of the year the school book store carried 180 pads of graph... solution with working
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... a-13 t...		 Mar. 02, 2011 at 10:18:08AM
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...ighs 2*55.8+3*16 = 159.6 g number of moles of iron (iii) oxide in 65g = 65/159.6 = 0.4073   number of moles of iron in 14.7g = 14.7/55.8 = 0.2634   The equation predicts that 0....		 Mar. 02, 2011 at 10:16:43AM
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...e are ...		 Mar. 02, 2011 at 10:03:04AM
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... Therefore height = sqr...		 Mar. 02, 2011 at 05:50:51AM
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...lify: E(t) = 0.7 t...		 Mar 01, 2011 at 7:40:52PM
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... Put over a common denominator by multip...		 Mar. 01, 2011 at 08:16:08AM
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... Use Pythagoras's theorem: z^2 + y^2 = x^2, wh...		 Mar. 01, 2011 at 05:59:08AM
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...rs.  A three hour visit costs 4.00.  We want to know ...		 Feb 28, 2011 at 12:17:07PM
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... 12-4(-7)+6 ...		 Feb. 28, 2011 at 11:55:46AM
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...riable.  Equate to C^n*Q.  Find n. eg. for part A., C^n(0.6L+20K+10F)=0.6CL+20CK+10FC  for some positive constant C and...		 Feb. 28, 2011 at 04:19:25AM
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