Tuesday

June 30, 2015

June 30, 2015

Total # Posts: 213

**Chemistry**

To 20 mL of .2 m nitric acid are added successive amounts of a base of unknown concentration. Neutrality is reached after the addition of 40 mL of the base. What was the OH of the original base solution? assume that it was 100% ionized.
*May 28, 2015*

**math**

43 circle
*March 4, 2015*

**Math**

The curves y=sinx and y=cosx intersects twice on the interval (0,2pi). Find the area of the region bounded by the two curves between the points of intersection.
*March 1, 2015*

**[Calculus] U-substitution for Integrals**

Nevermind. Found the answer again. Thanks again.
*February 23, 2015*

**[Calculus] U-substitution for Integrals**

Integral of cos(x)*a^sin(x) + C dx = Integral of cos(x)*sin(x)^a + C dx = Let a be a fixed positive number. I'm clueless is to how to solve for a...
*February 23, 2015*

**[Calculus] U-substitution for Integrals**

Nevermind, found the answer. It is (1/3)(u^5).
*February 23, 2015*

**[Calculus] U-substitution for Integrals**

Integrate from 1 to 5 of (3x-5)^5 dx = Integrate from a to b of f(u) du where (I have solved this part) u = 3x-5 du = 3 a = 0 b = 12 The original value of the integral is 165888 via calculator here's my last question, and it has to be in terms of u: f(u) = ? (Again, in ...
*February 23, 2015*

**AP Chemistry**

#1 is its own completely separate problem if it clears up any confusion. One of my friends says the Ho, being positive is endothermic, and she says it's more theoretically based too, and I don't think it uses any value of the heat formation table at all.
*February 12, 2015*

**AP Chemistry**

Thank you for #2! For #1, the same principles would apply right? Here are my reasons for the T/F. 1.) Decreasing the temperature at 500K would be beneficial for the reaction, and therefore would shift the reaction forward which would favor PCl3. Also, the equation is ...
*February 12, 2015*

**AP Chemistry**

2 Questions (Multi-choice and T/F, though not sure if they're right, and these 2 questions have no correspondence to each other) 1.) a.) Consider the following system at equilibrium where Kc = 1.20E-2 and H° = 87.9 kJ/mol at 500 K. PCl5 (g) <=> PCl3 (g) + Cl2 (g...
*February 12, 2015*

**AP Chemistry**

Consider the following reaction: 2NOBr(g) 2NO(g) + Br2(g) If 0.332 moles of NOBr, 0.377 moles of NO, and 0.375 moles of Br2 are at equilibrium in a 14.6 L container at 429 K, the value of the equilibrium constant, Kp, is ___. [NOBr] = .332mol/14.6 L = .0227 M [NO] = .377mol/14...
*February 12, 2015*

**Grade 12 Physics**

A rocket ship is moving away from the earth after having been fired from a launch pad in Florida. At what point above the earth's surface will the force of gravity be reduced to ½ of its original value? ------------------ Prior to this question I was given the ...
*January 13, 2015*

**Calculus I**

Semelparous organisms breed only once during their lifetime. Examples of this type of reproduction strategy can be found with Pacific salmon and bamboo. The per capita rate of increase, r, can be thought of as a measure of reproductive fitness. The greater r, the more ...
*November 2, 2014*

**Math**

A retail outlet purchased 300 printers at a list price of $100 less 7%, and 6%. The rate of markup on selling price on the printers was 40%. After selling 40% of the shipment, the rest of the printers were marked down to a reduced selling price. When there were only 40 ...
*July 16, 2014*

**Physics I for College**

thank you
*June 23, 2014*

**Physics I for College**

a rope that makes an angle of 30 degrees with the horizontal drags a crate along the floor. what must be the tension in the rope if a horizontal force of 40N is needed to drag the crate? please help me. i really didn't understand what my professor told me. he speak so fast...
*June 23, 2014*

**health**

hat is another name for bipolar disorder?
*June 17, 2014*

**Biology**

Hydrolysis uses a catabolic reaction. Explain what a catabolic reaction is and how it is useful in creating monomers from polymers.
*May 12, 2014*

**Reading**

What else can I add? I don't want to add too many "questions"
*February 23, 2014*

**Reading**

Okay, also for this passage "True, the genocide bloodlettings and other mass slaughters of the half century after Hitler- in Cambodia, in Biafra, in Bosnia, in Rwanda and elsewhere-did not approach the Holocaust in scale" I have down affected me a lot because knowing...
*February 23, 2014*

**Reading**

How does this passage affect you? “Lief was shown a pocketbook and lamp-shades made from human skin for Ilse Kich, wife of the commandant" So far I have: This left me in shock that someone would have the idea to skin off someone’s skin and make it into a gift ...
*February 23, 2014*

**Math**

83.95
*February 6, 2014*

**physics**

An ocean liner is traveling at 5m/s. A passenger on deck walks towards the rear of the ship at a rate of 4m/s. After walking 30 meters, he turns right and walks at a rate of 4m/s to the rail, which is 12 meters from his turning point. What is his velocity relative to the water...
*November 13, 2013*

**chemistry**

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 5.50-g sample is burned, and 1.70 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
*October 8, 2013*

**chemistry**

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 5.50-g sample is burned, and 1.70 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?
*October 8, 2013*

**chattco**

Dave's age in 4 years is 18. Write an equation that represents Dave's age in 4 years. Use the variable, d, to represent Dave's age
*June 5, 2013*

**Math**

A 3 in. by 5 in. photo is enlarged five times what is the dimensions of the larger photo
*May 9, 2013*

**Algebra 2**

Someone crapped in Howard's cornflakes
*May 3, 2013*

**Maths :(**

41 different balls are drawn from a bag containing balls numbered 1,2,…,300. The probability that the number of odd balls drawn is larger than the number of even balls can be expressed as ab where a and b are coprime positive integers. What is the value of a+b?
*April 15, 2013*

**geometry**

ABCD is a quadrilateral with ∠ADC=∠ACD, ∠ACB=∠ABC and CD=7. If triangles ADC and ABC have perimeter 51 and 59, respectively, what is the value of BC?
*April 15, 2013*

**Maths**

A bag contains 10 red marbles, 10 green marbles, 10 yellow marbles and 10 blue marbles. You reach into the bag and grab a marble, then reach into the bag and grab a second marble. The probability that the second marble is the same color as the first marble is ab, where a and b...
*April 15, 2013*

**Maths**

How many integer values x satisfy the inequality 2<3x−1/6<5?
*April 15, 2013*

**MAths**

Consider a digital clock. The first time after midnight when the three digits are all prime numbers is 2:22 am. What is the last time before 10:00 am, when the three digits on the clock are all prime numbers? Details and assumptions If you determine that the time is 4:23 am, ...
*April 15, 2013*

**Maths**

Find the number of positive integers <1000 that can be expressed as 2^k−2^m, where k and m are non-negative integers.
*April 12, 2013*

**Maths**

wasnt 5 :(
*April 12, 2013*

**Maths**

Two players each flip a fair coin. The probability that they get the same result can be expressed as ab where a and b are coprime positive integers. What is the value of a+b? Dont get the a+b :(
*April 12, 2013*

**Maths**

Let N=1!⋅2!⋅3!⋅4!…9!⋅10!. Let 2^k be the largest power of 2 that divides N. What is the value of k?
*April 12, 2013*

**Physics :(( help please TT**

You are a maker of hot air balloons and wish to construct a balloon that will lift you and a friend to places unknown. Your standard balloon design is a perfectly spherical, nylon fabric balloon with a small hole on the bottom for the burner that heats the air. Nylon starts to...
*April 12, 2013*

**Physics**

Consider a regular pyramid charged with constant volume charge density. The potential at point P, the top of the pyramid is 1V. What would be the potential at point P if we removed the top part, so the pyramid is instead truncated at a height h=0.6H? Hint: You don't need ...
*April 12, 2013*

**Maths**

In triangle ABC, D is the midpoint of AC and E is the midpoint of AB. BD and CE are perpendicular to each other and intersect at the point G. If AB=7 and AC=9, what is the value of BC^2?
*April 12, 2013*

**Maths**

Triangle ABC has lengths AB=14, AC=18 and also a given angle of ∠BAC=30∘. What is the area of triangle ABC?
*April 12, 2013*

**Maths**

If two six-sided dice are rolled, the probability that they both show the same number can be expressed as ab where a and b are coprime positive integers. What is the value of a+b?
*April 10, 2013*

**Maths**

Dont understand the a,b one TT
*April 10, 2013*

**Maths**

Two players each flip a fair coin. The probability that they get the same result can be expressed as ab where a and b are coprime positive integers. What is the value of a+b?
*April 10, 2013*

**ELA**

Which of the following is a simple sentence? A.Dawn mounted the stage slowly B.As she stepped in front of the podium,her legs were trembling. C.She was a talented speaker,and she greatly admired Dr.King. D.When she looked up again,her brother grinned and winked.
*April 6, 2013*

**Maths**

a and b are digits such that 120ab¯¯¯¯¯¯¯¯ is a multiple of 3, 5 and 7. What is the value of ab¯¯¯? Details and assumptions abc¯¯¯¯¯ means 100a+10b+1c, as opposed to a×b×c. As an ...
*March 29, 2013*

**Maths**

Let f be the function defined as f(x)=x^2 in the domain [−7,+7]. The range of f(x) is [a,b]. What is the value of a+b?
*March 29, 2013*

**Maths**

How many integers satisfy the inequality ∣10(x+1)/(x^2+2x+3)∣≥1?
*March 28, 2013*

**Maths**

Given tanθ=−4/3, where π/2<θ<π, what is the value of 1/(sinθ+cosθ)?
*March 28, 2013*

**Maths**

What is the sum of all integer values of n satisfying 1≤n≤100, such that n^2−1 is a product of exactly two distinct prime numbers?
*March 28, 2013*

**Maths**

What is the sum of all integer values of n satisfying 1≤n≤100, such that n2−1 is a product of exactly two distinct prime numbers?
*March 28, 2013*

**Maths **

Let f be the function defined as f(x)=x2 in the domain [−7,+7]. The range of f(x) is [a,b]. What is the value of a+b?
*March 28, 2013*

**Maths**

What is the sum of all integer values of n satisfying 1≤n≤100, such that n2−1 is a product of exactly two distinct prime numbers?
*March 28, 2013*

**Algebra**

ab = 75 Archaic solution: only possibilities for ab are 01 through 99. Eliminate all of those not divisible by 5, which leaves: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55. 60, 65, 70, 75, 80, 85, 90, and 95. Eliminate those not divisible by 3 (divisibility rule for 3) , which ...
*March 26, 2013*

**Physics**

Jake has a mass of 88.0 kg and is zooming along in a 110.0-kg bumper car at 9.4 m/s. He bumped Allen's car, which is sitting at rest. Allen has a mass of 88.0 kg. After the elastic collision, Jake continues ahead with a speed of 3.2 m/s. How fast is Allen's car bumped ...
*March 18, 2013*

**Chemistry**

Hg + 4H+NO-3 ---> Hg2+(NO3-)2 +2NO2 + 2H2O
*March 7, 2013*

**Chemistry**

Hg + 4H+NO-3 ---> Hg2+(NO3-)2 +2NO2 + 2H2O
*March 7, 2013*

**geometry**

Write an equation for each circle described. Center at origin,radius is 3. I'm stuck.aren't I suppose to be given an endpoint for me to be able to use the midpoint formula to find the center? I need help please...oh that's the only thing they give me.
*February 19, 2013*

**Physics**

The electric field intensity at a point 2m from the surface of a uniformly charged conducting sphere is 1920 N/C. At a point 4m from its center, the electric field intensity is 3000 N/C. a.) Determine the radius of the sphere. Determine the electric field intensity at a point...
*February 4, 2013*

**geometry**

Two observers are 200 feet apart,in line with a tree containing a birds nest.The anles of elevation to the birds nest are 30 degrees and 60 degrees.How far is each observer from the base of the tree? Please help me my assigment is due tommorrow!!!!!
*January 24, 2013*

**geometry**

I need help on a question that wants me to find x and y on a 45-45-90 triangle they only give me one side wich is three.I already solved for x which is three root two over two...Is that right? I don't know how to solve for y... Please someone help me....:(
*January 22, 2013*

**geometry**

I need help on a question that wants me to find x and y on a 45-45-90 triangle they only give me one side wich is three.I already solved for x which is three root two over two...Is that right? I don't know how to solve for y... Please someone help me....:(
*January 20, 2013*

**English**

^ hell yeah!
*December 17, 2012*

**Chemistry**

KF has the same type of crystal structure as NaCl. The unit cell of KF has an edge length of 5.39 Å. Find the density of KF in g/cm3
*December 8, 2012*

**Chemistry**

KF has the same type of crystal structure as NaCl. The unit cell of KF has an edge length of 5.39 Å. Find the density of KF in g/cm3
*December 8, 2012*

**algebra**

A roast chicken is done with the temperature of the thigh meat is between 165 and 175. Write a compound inequality to represent the temperature at which a roast chicken is done.
*November 20, 2012*

**Calculus I**

How did you get 2r for the height in the volume of water?
*November 12, 2012*

**Calculus**

The region between the graphs of x=y^2 and x=4y is rotated around the line y=4. The volume of the resulting solid is?
*October 26, 2012*

**Physics**

sorry I mean num 6,7
*October 26, 2012*

**Physics**

has anybody done num 10? it doesn't tell you where "that instant" is so what the hell?
*October 26, 2012*

**Physics**

i cant get the answer... thx for the help tho mike.
*October 25, 2012*

**Physics**

kaminsky hooray :p
*October 25, 2012*

**trig**

b=8944ft
*October 15, 2012*

**Physics**

The steel ball is suspended from the accelerating frame by the two cords A and B. The angles (they are on the inside) are both 60 degrees. Determine the acceleration of the frame which will cause the tension in A to be twice that in B. The acceleration is going to the right ...
*October 4, 2012*

**Math**

24:30 or 4:5 .... or 4/5 ... or 4 to five
*October 4, 2012*

**physics**

Use range equation: d = [v^2(sin2theta)]÷g 18 = [v^2(0.58778)]÷9.8 (18 x 9.8)÷0.58778 = v^2 v^2 = 216.745 v = 14.722 m/s Hope this helps :)
*October 4, 2012*

**geometry **

"Determine whether the conjecture is true or false.Give a counterexample for any false conjecture". Given: x = 5 Conjecture: m = 5 PLEASE HELP!!!
*September 18, 2012*

**geometry**

Determine whether each conjecture is true or false.Give a counter example for any false conjecture. Given:Angle 1 and angle 2 are not complementary.angle 2 and angle 3 are complementary. Conjecture:angle1=angle3
*September 12, 2012*

**geometry **

I need help on this question "Find the value of the variable and GH if H is between G and I". GI=8b+2,HI=3b-2,HI=16 Please helo me....
*August 29, 2012*

**geometry**

Thank you!!!
*August 28, 2012*

**geometry**

I need help on this homework question KL and KJ are opposites rays.Angle 1 is congruent to angle 2 and KM bisects angle NKL.If angle JKN=9x+5 and angle MKL=2x+3,what is angle MKN? Please help me....
*August 28, 2012*

**Math**

is that true? the answer, how old are you two?
*July 11, 2012*

**calculus**

Each of the sides of a square (S) with an area of 16 is bisected and a smaller square (S2) is constructed using the bisected parts as vertices. The same process is carried out on S2 to construct an even smaller square (S3). What's the area of S3? (Draw a diagram, please?)
*June 5, 2012*

**math**

Thank you very much!
*May 13, 2012*

**math**

2 planes parallel to the base of a pyramid cut the pyramid at 1/4 and 2/3 of the height as measured from the base up. If the volume of the pyramid is 100 cubic inches, what is the volume of the middle piece to the nearest tenth?
*May 13, 2012*

**math**

What is 3/8 divided by 9/10?
*May 6, 2012*

**geometry**

draw it, it always helps you will see that you need to use Tangent "Opposite over adjacent" tan(angle)=65/20
*April 22, 2012*

**Math**

3 hours
*April 6, 2012*

**Math**

If it takes 45 minutes to make 15 chairs how long would it take to make 100 chairs.
*April 6, 2012*

**physics**

A tow truck is connected to a 1500 kg car by a cable that makes a 27 degree angle to the horizontal. If the truck accelerates at 0.58 m/s^2, what is the magnitude of the cable tension? Neglect friction and the mass of the cable.
*April 1, 2012*

**physics**

A 140 g arrow is shot vertically from a bow whose effective spring constant is 500 N/m. If the bow is drawn 60 cm before shooting the arrow,to what height does the arrow rise?
*April 1, 2012*

**chemistry**

my K value was right. My mistake was when I plugged my values from my ICE table into the expression I used 0.25x^2/1.35-x instead of just x^2/1.35-x. Everything else was right.Thanks anyway
*March 24, 2012*

**chemistry**

At 298 K, 1.35 mol BrCl(g) is introduced into a 12.0 L vessel, and equilibrium is established in the reaction. BrCl(g)-->0.5Br2(g) + 0.5Cl2(g) Calculate the amount of BrCl(g) present when equilibrium is established.(Use delta G[Br2(g)]=3.11kJ/mol and delta G[BrCl(g)=-0.98Kj...
*March 24, 2012*

**Physics**

The problem is the notation. That is not kilo-newtons, that is k hat newtons. it should be 8/(17*1*3)
*March 3, 2012*

**business**

The answer to 18 is A - pie chart
*February 10, 2012*

**geometry**

A park at the end of a city block is a right triangle with legs 150 ft and 200 ft long. Make a scale drawing of the park using the following scale 1in:300ft.
*February 1, 2012*

**chem**

I have to find the effective pH range of a buffer. I read that this optimal buffering occurs when the pH is within 1 pH unit from the pK value for the buffering system. But can anyone explain why its is optimal within 1 pH unit? Thanks.
*January 28, 2012*

**Science**

What is a reference point in determining force, velocity,speed?
*January 22, 2012*

**Science**

If a car is going 65mph makes a 90 degree, what changes?
*January 22, 2012*