Friday

January 30, 2015

January 30, 2015

Total # Posts: 67

**AP Chemistry**

I got it! The initial concentration of CN- would be 0.065 M rather than 0 M.
*January 20, 2015*

**AP Chemistry**

The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
*January 20, 2015*

**chemistry**

Calculate the amount of heat absorbed when 58 g of steam at 117◦C are completely converted to ice at −32.5◦C. Specific Heat: H2O(s) = 2.09 J/g◦C H2O(l) = 4.18 J/g◦C H2O(g) = 2.03 J/g◦C Heat of Fusion = 334 J/g Heat of Vaporization = 2260 J/g...
*November 15, 2014*

**math**

a football player attempts a field goal from a distance of 52 yards. The ball reaches a maxium height of 9 yrds and lands 8 yards behind the uprights. If the uprights are 3 yards high. algebraically determine if the field goal was successful
*November 6, 2014*

**chemistry**

i need help solving this Benzoic acid is a weak, monoprotic acid (Ka = 6.3 × 10−5). Calculate the pH and the percent dissociation of each of the following solutions of benzoic acid. Then use Le Châtelier’s principle to explain the trend in percent ...
*June 7, 2014*

**chemistry**

How would you do this question: A student dissolved 5.0 g of vitamin C in 250 mL of water. The molar mass of ascorbic acid is 176 g/mol, and its Ka is 8.0 × 10−5. Calculate the pH of the solution. Note: Abbreviate the formula of ascorbic acid to HAsc.
*June 7, 2014*

**Calculus**

Find a positive number such that the sum of the square of the number and its reciprocal is a minimum.
*March 25, 2014*

**Grade 12 Calculus**

thx!
*March 25, 2014*

**Grade 12 Calculus**

For an outdoor concert, a ticket price of $30 typically attracts 5000 people. For each $1 increase in the ticket price, 100 fewer people will attend. The revenue, R, is the product of the number of people attending and the price per ticket. a) Let x represent the number of $1 ...
*March 25, 2014*

**Calculus**

There are 50 apple trees in an orchard, and each tree produces an average of 200 apples each year. For each additional tree planted within the orchard, the average number of apples produced drops by 5. What is the optimal number of trees to plant in the orchard? I mostly need ...
*March 25, 2014*

**Grade 12 Calculus**

A rectangular piece of paper with perimeter 100 cm is to be rolled to form a cylindrical tube. Find the dimensions of the paper that will produce a tube with maximum volume. I have made it up to getting an equation for V(w).
*March 25, 2014*

**Math**

2x(√3x^2)*2√x how would you simplify this?
*February 17, 2014*

**Math**

2x√3x*2√x i was wondering how to simplify this
*February 17, 2014*

**AP Chemistry**

The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
*December 2, 2013*

**Complex Math**

Compute all possible values of e^i
*November 25, 2013*

**Calculus**

Evaluate the surface integral. the double integral of (x^2 + y^2 + z^2)dS over Region S. S is the part of the cylinder that lies between the planes z = 0 and z = 5, together with its top and bottom disks Can anyone help?
*November 6, 2013*

**multivariable calculus**

Studying for a test, and saw this: Find the center of mass of the hemisphere x^2 + y^2 + z^2 = a^2; z>=0 if it has constant density. Any ideas?
*November 6, 2013*

**physics**

In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?
*September 22, 2013*

**english**

What is the author referring to in this reading passage? Thus early had that one guest,--the only guest who is certain, at one time or another, to find his way into every human dwelling, --thus early had _______ stepped across the threshold of the House of the Seven Gables!
*July 7, 2013*

**physical**

David's clock ticks once for every two of Phil's clock ticks. How fast is Phil moving by David?
*June 17, 2013*

**physical**

Franky claims he has a mass of 65kg. He is sitting on a spherical bouy that oats just barely submerged under water. When he gets o it rises halfway out of the water. What must the radius R in centimeters of the sphere be for him to be telling the truth?
*June 17, 2013*

**PHYS**

You throw a bowling ball o the empire state building(381m high) 10m/s down- ward. How long does it take to get to the bottom?
*June 17, 2013*

**algebra**

If Jenny's car uses less gas per mile driven than Sandra's truck, how does the graph representing the rate of change of Sandra's truck compare to the graph representing the rate of change of Jenny's car?
*June 16, 2013*

**math**

What?
*May 9, 2013*

**Quick Math Question**

okay thx
*March 28, 2013*

**Quick Math Question **

How do I add time? If a person worked 4 1/2 hours on Monday, 4 1/2 hours on Tuesday and 2 hours on Wednesday, does that add up to 12 hours? If not, how much more time would the person need to work the next day to equal 12 hours?
*March 28, 2013*

**engineering mechanics **

A person A is trying to keep his balance while on a sled B that is sliding down an icy incline. Let mA = 78kg and mB = 25 kg be the masses of A and B, respectively. In addition, let the static and kinetic friction coefficients between A and B be μs = 0.4 and μk = 0....
*December 31, 2012*

**Physics **

A refrigerator does 18kJ of work while moving 115 kJ of thermal enegy from inside the refrigerator. What is its coefficient of performance?
*November 22, 2012*

**Physics **

A refrigerator has a coefficient of performance of 4.0. When removing 2.4x10^4 J from inside the refrigerator, how much energy is sent into the environment?
*November 19, 2012*

**Math**

For a class C corporation in Louisiana, the amount of state income tax S is deductible on the federal return and the amount of federal income tax F is deductible on the state return. With $200,000 taxable income and a 30% federal tax rate, the federal tax is 0.30(200,000 - S...
*October 17, 2012*

**Chemistry **

Consider this equilibrium N2(g) + H2(g) <==> NH3(g) +94 kJ The equilibrium law exoression for the balanced chemical equationwould be A. [N2][H2]/[NH3] B. [NH3]/[H2][N2] C. [NH3]2/[H2][N2] D. [NH3]2/[H2]3[N2] E. 2[NH3]2/3[H2]3[N2]
*January 3, 2012*

**Chemistry**

which of the following statement are true for all electric cells? I. electrons flow from the anode to the cathode II. reduction occurs at the anode III. oxidation occurs at the cathode IV. oxidation occurs at the anode V. reduction occurs at the cathode A. I,IV and V B. I,II ...
*January 3, 2012*

**maths**

if 3x + 8 =20 - 3x, what is x
*August 27, 2011*

**geometry**

if 3x + 8 =20 - 3x, what is x
*August 27, 2011*

**math**

You receive an invoice for $565.00 with terms 3/10, net 30. If you pay it immediately, how much will you pay?
*June 3, 2011*

**american government**

What is the difference between civil liberties and natural rights?
*May 4, 2011*

**Math**

a.Set table as x,chair as y 90x+40y<or=1000 b.just plug in and try c.so y=6x substitute 6x for y you get 90x+240x<=1000 so x<=100/33 greatest one is 3 for table,18 for chair
*March 20, 2011*

**Physics**

Question, wouldn't it be 720 years? Because 10 years = 1 century. So .001ms/day ( 365days/yr) * 720 years * 1s/1000ms * 1hr/3600s
*January 12, 2011*

**math**

6 minutes
*December 7, 2010*

**math**

5x-3y=11 4x-7y=18
*December 2, 2010*

**accounting**

Derm Travel Agency accepted a four-month, 9% interest rate, 52.000 note from one otits customers on May 1, 2008. The entire balance is payable at the notes maturity. Prepare the May 31 adjusting journal entry related to this note. Do I debit cash and interest receivable; and ...
*November 13, 2010*

**chinese**

tian cai
*November 10, 2010*

**chemistry**

A jogger runs at an average speed of 5.9 mi/h. If she starts a run at 11:15 am, what time is it after she covers 4.75 x 104ft?
*September 3, 2010*

**physics**

shut up
*April 26, 2010*

**environmental science for college**

I don't know the answer
*March 28, 2010*

**MATH157**

SUPPOSE YOU BUY 1 TICKET FOR $1 OUT OF A LOTTERY OF 3000 TICKETS. IF THE PRIZE FOR THE ONE WINNING TICKET IS TO BE $500, WHAT ARE YOUR EXPECTED WINNINGS?
*March 18, 2010*

**Auditing**

qtfq
*March 11, 2010*

**8th grade**

apply the formula of (a-b)^2 i.e a^2-2ab+b^2. the required answer is 9x^2-24x+16.
*January 20, 2010*

**Chemistry**

why different detergents have different price?on what physical properties are their qualities based?
*January 19, 2010*

**chemistry**

A sample of silver chromate (Ag2CrO4) has a mass of 29.0 g. (a) How many Ag+ ions are present? (b)What is the mass in grams of one formula unit of silver chromate? (c) How many CrO42- ions are present?
*January 13, 2010*

**chemistry**

Determine the number of representative particles in each of the following and identify the representative particle. a. 13.0 mol Ag b. 23.7 mol H20 c. 0.178 mol NaCl
*January 13, 2010*

**chemistry**

how many grams of CaCl2 would be dissolved in 1.9 liters of a 0.2 molarity solution of CaCl2?
*January 13, 2010*

**chemistry**

Determine the number of moles of sulfate ions present in 1.20 mol iron(III) sulfate (Fe2(SO4)3).
*January 13, 2010*

**math**

The sales representative informs you that there are two floor plans available, and that there are a total of 56 houses available. Use x to represent floor plan #1 and y to represent floor plan #2. Write an equation that illustrates the situation. The sales representative later...
*April 25, 2009*

**spelling**

well what is it? i dont get it :'(
*February 19, 2009*

**social studies**

Without our two great political parties cutting across economic and geographic interests, democracy as we know it could never have been made to function." The author of this statement probably meant to suggest that
*February 9, 2009*

**physics**

A 47.0 g golf ball is driven from the tee with an initial speed of 54.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. What is its speed when it is 9.0 m below its highest point
*October 21, 2008*

**chemistry**

Answer is 1480g Do the math. Someone already gave the formula. The cm cancels out after multiplying. Note: you have to cube the 5.5cm
*September 11, 2008*

**ACCOUNTING**

qwwq
*September 26, 2007*

**life science**

Explanation of why the process of mitosis and meiosis are both important to a living organism. When would an organism need to undergo the process of mitosis? When would an organism need to undergo the process of meiosis? What would happen if meiosis did not occur I will gladly...
*August 10, 2007*

**algebra**

i need help finding the base. this is the equation i got after work it out halfway. 42/h+h+sqroot(42/h)^2+h^2=20 ft how can i find B & H. How should i go about. Thanks. Isnt the sqrt of (42/h)^2 just 42/h ? Then, multipy both sides of the equation by h, that gives you a third ...
*August 6, 2007*

**Life Science**

How did Mendel’s approach to answering scientific questions differ from that of his contemporaries? Thank you for using the Jiskha Homework Help Forum. You might want to see the answer just posted for Diana.
*August 4, 2007*

**help with solving**

x^2+(x-2)^2 = (2x-6)^2 solve for x. thanks so much. Please keep in mind that tutors here won't simply do your work for you. I'm sure you'll get a better response if you show your work as far as you can get, so tutors will know where you get stuck. =) it was a word ...
*August 3, 2007*

**algebra**

solve for x (24+2x)(10+2x) - 240 = 152 First multiply. 24(10) = ___ 2x (2x) = ____ Now subtract 240. Can you finish the problem from here? dont i need to put this in equatic equation to solve for x. cause i need to find the width of a small rectangle inside a bigger triangle. ...
*August 3, 2007*

**Life science**

are humans subject to the same pressure of natural selction as other organism Humans show signs of natural selection occuring, according to these studies. http://www.news.cornell.edu/stories/Oct05/Bustamante.kr.html (Broken Link Removed)
*July 25, 2007*

**Science**

I need to know how to compare mouthwash and toothpaste...what to compare?.. compare bacteria samples in salaiva.
*February 26, 2007*

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