Wednesday

July 1, 2015

July 1, 2015

Total # Posts: 198

**Physics**

If it was to be built in real life the difference in height will increase potential energy, the mass will increase, and therefore because it was increased uniformly F=MA acceleration will be constant. so yes.
*June 20, 2015*

**math**

So if by LCD you mean Least Common Denominator, I would start off with finding values of 7 8 12 that are the same, so by multiplying 7 and 8 you get 56 which is not a multiple of 12. so we must now find the LCM of 56 and 12 which is 168 found by looking at the progression of ...
*June 20, 2015*

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. 1. When it looked like all hope was lost for winning the war, the commander ...
*June 18, 2015*

**English**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most museum visitors displayed respect for the artiste's work, ...
*June 18, 2015*

**Language Arts **

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While being an extra on a movie set may seem fun and exciting, it is ...
*June 18, 2015*

**LA**

then what is 1? thanks though
*June 18, 2015*

**LA**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. While most people in Los Angeles will go to a Dodger's game every now ...
*June 18, 2015*

**Language Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The fact that the lottery winner flaunted his newly acquired wealth made all...
*June 18, 2015*

**English **

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. The group of friends _________ around the coffee shop long after it was ...
*June 18, 2015*

**Languarge Arts**

Word Bank: deliberately, derision, despair, diligent, fatigue, felicitous, fervent, impudent, insolence, keen, lingered, meagerness, merit, mock, obliged, resentful, tedious, terse, treacherous, vast. When it looked like all hope was lost for winning the war, the commander ...
*June 18, 2015*

**Science**

If the volume of a balloon is 5.0 L at 22 degrees Celsius, what will be the new volume if the balloon is heated to 75 degrees Celsius? Should the volume increase or decrease? 5/22=x/75 x=17.045
*May 27, 2015*

**math**

A video rental company offers a plan that includes a membership fee of $8 and charges $2 for every DVD borrowed. They also offer a second plan, that costs $14 per month for unlimited DVD rentals. If a customer borrows enough DVDs in a month, the two plans cost the same amount...
*April 23, 2015*

**Chemistry AP**

This isn't quite an HW question, I'm needing any site that gives practice Free Response problems for equilibrium for AP Chemistry if there are any for study and practice.
*April 21, 2015*

**Algebra 2**

Karl says that you can take the square root of each side of an equation. Therefore, he says that (x + 5)2 + ( y – 7)2 = 36 and ( x + 5) + ( y – 7) = 6 are equivalent equations. Emily says the equations are not equivalent. Who is right? Explain your answer. I know ...
*March 27, 2015*

**o level mathematics**

in a class of 35, all the pupils play at least 1 game, volleyball, netball and hockey. volleyball only 10, those who play netball only 5, those who play hockey only 3, if 2 play all 3 games how many altogether play volleyball
*March 6, 2015*

**Chemistry Ap**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...
*March 3, 2015*

**Chemistry AP**

At 20◦C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 35.5 torr at 20◦C. Calculate the mole fraction of methanol in this solution. Assume the solution ...
*March 3, 2015*

**Chemistry, HELP!**

Mole fractions
*February 26, 2015*

**Chemistry, HELP!**

Molybdenum (Mo) is a heavy metal that can have severe health effects on humans and animals. Tailings from a mining operation in Colorado have polluted surface waters used by grazing animals with Mo. Based on the following information determine the concentration of the three Mo...
*February 26, 2015*

**Math**

What is the unit rate of ounces. A hint is 48 ounces cost costs 3.00 dollars. I divided 48 by three but and got 16 cents but when I multiply by 48 it doesn't equal 3 dollars
*February 25, 2015*

**Math**

1. Daniel wants to save at least 20 dollars by putting pennies in a jar daily. On first day, he puts one penny into the jar. The second day he puts 2 pennies into the same jar. On the nth day he pus n pennies into the same jar. Which day is the first day on which he has at ...
*February 22, 2015*

**Chemistry AP**

1.301029996, thanks Bob
*February 20, 2015*

**Chemistry AP**

Hey Bob, What is the pH at the point during a titration when 20 mL of 0.200 M HCl has been added to 30 mL of 0.0500 M NH3 solution? HCl is strong acid, Kb = 1.8 × 10−5 for NH3. Answer in units of pH. I've gone about getting the mmol of HCl and NH3, getting ...
*February 20, 2015*

**Chemistry AP**

Remember the system I use for online homework does not care about significant digits, it goes out to /at least/ 6 decimal places. And I butchered spelling rearranging.
*February 9, 2015*

**Chemistry AP**

Alright, this time, I know I have not mistyped my answer. Find the initial concentration of the weak acid or base in an aqueous solution of hydrazine (NH2NH2) with a pH of 10.16. Kb = 1.70 ×10−6 Answer in M I've tried going from 10^-pH then using that (as my x...
*February 9, 2015*

**Chemistry AP**

Once again I was foolish and mistyped an earlier answer, getting 4.02e-4 for my answer. I had not put in the 0 between the 4 and the 2 when submitting.
*February 9, 2015*

**Chemistry AP**

Well, I've tried going using 4.3e-7=x^2/0.377 to get to what x equals, I've been getting 0.0069, but it's incorrect.
*February 9, 2015*

**Chemistry AP**

Calculate the concentration of H3O + present in 0.377 M H2CO3. Answer in units of mol/L I know the Ka of H2CO3 is 4.3E-7. But I don't know what to do from there. (Or, I'm not getting the correct answer at least)
*February 9, 2015*

**SS**

What was the purpose of the Adams-Onis Treaty? Can some help me answer this question?? Ms. Sue??
*February 6, 2015*

**Chemistry AP**

The UT (University of Texas) Quest system, Online quizzes, takes it out further for it to count as correct, when I am taking in class tests on paper, yes, it's cut down using significant digits.
*February 5, 2015*

**Chemistry AP**

I've figured out my mistake, mentioned above your post, mistypes when inputting answers are a terrible thing :p
*February 5, 2015*

**Chemistry AP**

I made a silly mistake and inputted the correct answer of 4.805909915 as 4,805909915, I noticed as I looked at my previous answers, sorry for all of this.
*February 5, 2015*

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do...
*February 5, 2015*

**Chemistry AP**

Correction. I meant Ka=([H+][Cl-])/[NH4Cl] not Kw
*February 5, 2015*

**Chemistry AP**

Calculate the pH of a 0.44 M aqueous solution of NH4Cl. Kb = 1.8 × 10−5 . I've tried used the Ka=Kw/Kb equation then used the resulting 5.5e-10 in Kw=([H+][Cl-])/[NH4Cl] , using that to get the [H+], but it isn't correct and I don't know what else to do.
*February 5, 2015*

**AP Chemistry**

Calculate the entropy change when 4.88 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ)at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The corresponding free energy of ...
*January 20, 2015*

**AP Chemistry**

What is the value of w (work) when 1.3 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal I know ...
*January 6, 2015*

**physics**

Calculate the momentum of a 0.1 kg rifle bullet traveling 500 m/s. Answer in units of kg•m/s
*November 13, 2014*

**trigonometry**

A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?
*May 26, 2014*

**physics**

Two stars are 4.40 1011 m apart and are equally distant from the earth. A telescope has an objective lens with a diameter of 1.03 m and just detects these stars as separate objects. Assume that light of wavelength 550 nm is being observed. Also assume that diffraction effects...
*April 18, 2014*

**Biology: Genetics**

In guinea pig, short hair (L) is dominant to long hair (l) and the heterozygous condition for yellow coat (Y) and white coat (y) gives cream coat. A short haired guinea pig is bred to long haired white guinea pig and one of the offspring is a long haired baby guinea pig. a. ...
*February 4, 2014*

**Calculus**

A spherical oil tank with a radius of 10 feet is half full of oil that weighs 60 pounds per cubic foot. Its top is 6 feet underground. How much work is needed to pump the oil out of the tank through a hole in its top? How do I solve this? Does the fact that it its top is 6 ...
*December 14, 2013*

**Calc**

I did the problem. I found the fluid force to be 54 times the integral from -3 to 0 of (-y)(2)(root(9-y^2)dy my final answer was 972 pounds. Is that correct? note from my work: h(y)=-y L(y)=2x=2root(9-y^2)
*December 14, 2013*

**Calc**

A cylindrical slime tank is placed so that the axis of the cylinder is horizontal. Find the fluid force on a circular end of the tank if the tank is half full, assuming that the diameter is 6 feet and the slime weighs 54 pounds per cubic feet?
*December 14, 2013*

**pre-algebra**

Can you help
*October 1, 2013*

**math**

How to tell 4/7 on a ruler
*May 13, 2013*

**math**

K Thanks
*May 13, 2013*

**math**

What is 4/7 in inches
*May 13, 2013*

**math**

How to tell 4/7 on a ruler
*May 13, 2013*

**math**

Thank you
*May 5, 2013*

**math**

What does 1/10 equal in percent?
*May 5, 2013*

**math**

Thank u :-)
*May 2, 2013*

**math**

Dave sent five emails every 6 minutes for 30 minutes. Lee sent 4 emails every 5 minutes for 30 minutes. Who sent more emails?
*May 2, 2013*

**math**

1)I AM greater than 15 and less than 40 if you double me I become a number that ends in 0 1/5 of me is equal to 5 2) if you multiply me by 2 ,I become a number greater than 20 and less than 40 if you multiply me by 6,I end in 8 if you multiply me by 4 I end in 2 Help me figure...
*April 11, 2013*

**Physics**

An object is dropped from rest. What is its instantaneous speed when it has been in motion for 7 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m/s
*March 16, 2013*

**Chemistry**

In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from most to least: HClO, OCl, OH^-, H30^+, H20
*February 21, 2013*

**math**

how do I find the volume of a rectangular prism height 2 ft, width 5 1/2 ft length 9 3/8 ft?
*February 4, 2013*

**please help this is a geometry question**

is this for artofproblemsolving? I have the same question. Idk but I think it is close to 343√3/3π.
*December 5, 2012*

**Physics**

This is a projectile motion question. A ball with a mass of .4 kg, initially at rest is kicked directly toward a 3 meter fence from a point 20 meters away. The initial velocity is 17 m/s at an angle of 35 degrees. The ball is hit by nothing and there is no wind resistance, but...
*October 13, 2012*

**math**

Two investments earn a total annual income of $2825. One investment is in a 6.75% annual simple interest certificate of deposit. The other is in a 7.25% tax free annual simple interest account. The total amount invested is 40,000. Find the amount in invested in the certificate...
*October 3, 2012*

**math**

When i am rounded to the nearest tens I am 1,000. I am the same when read forward or backward, I can be two different numbers. Who am I?
*September 26, 2012*

**Geometry**

graph each set of lines to form a triangle. find the area and perimeter. y=2, x=5 , and y=x Answer is Area = 4.5 units Perimeter = 6 + square root of 2. I don't know how to graph this. What does y=x mean?
*July 4, 2012*

**Physics**

At a county fair, a boy takes his teddy bear on the giant Ferris wheel. Unfortunately, at the top of the ride, he accidentally drops his stuffed buddy. The wheel has a diameter of 14.6 m, the bottom of the wheel is 2.4 m above the ground and its rim is moving at a speed of 1.0...
*June 14, 2012*

**Integral Calculus**

Sorry, I misread that as 2x instead of x^2.
*May 24, 2012*

**Integral Calculus**

To solve that last integral, you have to use the substitution rule. u= x^2 + 1 du= 2x Therefore the integral becomes: -1/2∫(2/u) du Factor out the 2 -∫1/u du Integrate -ln(u) Which is equal to -ln(x^2 +1) Since u= x^2 + 1
*May 24, 2012*

**Physics**

I understand how the first and third equations are used to find the answers, but how is the second equation (mg = Tcosa) used?
*May 24, 2012*

**Physics**

An external force F is holding a bob of mass 725 g in a stationary position. The angle that the massless rope makes with the vertical is θ = 33°. (a) What is the magnitude, F, of the force needed to maintain equilibrium in N? (b) What is the tension in the rope in N?
*May 24, 2012*

**Advanced Algebra**

Jim begins a job with a starting salary of 27000 dollars. she is guaranteed a raise of 4.75% each year. Sarah also starts a job with a salary of 27000 dollars, she is guaranteed a raise of 1500 dollars each year. What will be Jim's salary after five years
*April 30, 2012*

**Chemistry**

Calculate the cell potential for this voltaic cell at 298K if it is constructed using solutions of .25M Ni(NO3)2 and .01M Cu(NO3)2 Any explanation would be spectacular
*April 23, 2012*

**Chemistry**

A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions? What is emf of cell when [Ce{4+}]=2.1M, [Ce{3+}]=.13M, and [Cr{3+}]=2.0*10^-2
*April 15, 2012*

**Chemistry**

A voltaic cell utilizes the following reaction and operates at 298K 3Ce{4+}(aq)+Cr(s)--->3Ce{3+}(aq)+Cr{3+}(aq) {}=Charge What is the EMF of this cell under standard conditions? What is emf of cell when [Ce{4+}]=2.1M, [Ce{3+}]=.13M, and [Cr{3+}]=2.0*10^-2
*April 15, 2012*

**Chemistry **

Consider the voltaic cell Zn(s) + Cu{2+}(aq)--> Zn{2+}(aq)+Cu(s) {}=charge Under standard conditions, what is the maximum electrical work, in Joules that can accomplish if 60 g of copper is plated out?
*April 15, 2012*

**Chemistry**

Cytochrome, a complicated molecule that we will represent as CyFe2+, reacts with the air we breathe to supply energy required to synthesize adenosine triphosphate (ATP). At pH 7.0 the following reduction potentials pertain to this oxidation of CyFe2+: O2(g) + 4 H+(aq) + 4 e...
*April 15, 2012*

**Chemistry**

Complete and balance the following equation: Cr2O7{2-}(aq)+CH3OH(aq)-->HCO2H(aq)+Cr{3+}(aq) Any feedback would be great, thank you so much.
*April 14, 2012*

**Physics**

A diver performing a double somersault spins at an angular speed of 4.5 π rad/s precisely 0.70s after leaving the platform. Assuming the diver begins with zero initial angular speed and accelerates at a constant rate, what is the diver’s angular acceleration during ...
*March 28, 2012*

**Physics**

A girl sitting on a merry-go-round moves counterclockwise through an arc length of 3.36m. If the girl’s angular displacement is 2.96 rad, how far is she from the center of the merry-go-round? Answer in units of m.
*March 28, 2012*

**Physics**

A ﬁgure skater begins spinning counterclockwise at an angular speed of 4.6π rad/s. During a 4.6s interval, she slowly pulls her arms inward and ﬁnally spins at 7.6π rad/s. What is her average angular acceleration during this time interval? Answer in ...
*March 28, 2012*

**Physics**

The tension in a string from which a 5.4kg object is suspended in an elevator is equal to 53.02N. What is magnitude of the acceleration a of the elevator? The acceleration of gravity is 9.8 m/s^2
*February 15, 2012*

**Physics**

A 40.7kg wagon is towed up a hill inclined at 18.1 degrees with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 139N in it. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. The acceleration of ...
*February 15, 2012*

**Physics **

Karen has a mass of 62.60 kg and she rides the up escalator at Woodley Park Station of the Washington D.C. Metro. Karen rode a distance of 62 m, the longest escalator in the free world. How much work did the escalator do on Karen if it has an inclination of 35°?
*January 31, 2012*

**Physics **

An 845-N sled is pulled a distance of 190 m. The task requires 1.70 104 J of work and is done by pulling on a rope with a force of 124 N. At what angle is the rope held?
*January 31, 2012*

**Pre-Algrebra**

I(220-a-r)+r I=.5 a=45 r=85
*January 20, 2012*

**math**

Can you please give me a example of a - and + multi step equation
*January 19, 2012*

**math-probability**

There is a 10/49 chance that BOTH of them are running.
*December 13, 2011*

**math-probability**

Disregard my previous answer. You should add the probabilities. 7/7 chance.
*December 13, 2011*

**math-probability**

Multiply the two probabilities together. 2 5 10 - x - = -- 7 7 49 There is a 10/49 chance that AT LEAST one of them is running on a given day. I think.
*December 13, 2011*

**Algebra**

You actually need parentheses around '2200 + 1.50x' when you are dividing to find the average. So (2200 + 1.5x)/x would be my answer. (I removed the 0 after 1.5 also, as 1.5 is the same number as 1.50.)
*December 13, 2011*

**English/Commas**

I'm not sure, but I think that the first sentence needs another comma to separate the state from the city (if Winston is a city in Colorado). Also, in the first sentence, I think that John Pearson is the person living in Colorado, and not being addressed. Therefore, I don...
*December 13, 2011*

**geometry**

"I get another chance" is the hypothesis. "I will do better" is the conclusion.
*December 12, 2011*

**Calculus**

When a particle is located a distance x meters from the origin, a force of cos(x/4) newtons acts on it. How much work W is done in moving the particle from x = 1 to x = 3?
*December 4, 2011*

**Chemistry**

Thanks for the help!
*November 19, 2011*

**Chemistry**

Need a lot of help! Specific gravity of a drug is 0.9815. How many cc of this drug should be administered for a dose of 215mg?
*November 19, 2011*

**math**

In 69 games, a player blocks 234 shots, what is his blocks per ratio?
*November 17, 2011*

**Calculus**

The widths (in meters) of a kidney-shaped swimming pool were measured at 3-meter intervals as indicated in the figure. Use the Midpoint Rule with n = 4 to estimate the area S of the pool if a1 = 15.5, a2 = 18, a3 = 17, a4 = 14, a5 = 12.5, a6 = 12, and a7 = 12.
*November 9, 2011*

**Math**

Janice said that if you cut a cube into two parts you form 2 smaller cubes. Ling said that 2 rectangular prisms are formed. Who is correct? Explain.
*November 5, 2011*

**Math**

Expand [1+x^2(1+x)]^7 in ascending powers of x as the term in x^8.
*October 2, 2011*

**Please Help!!!**

given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi
*September 28, 2011*

**calculus**

given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi
*September 28, 2011*

**calculus**

given the graph of f(x) = x sinx, 0<=x<=2pi assuming that a quantity y changes at a rate of y' = xsinx, find by how much it will increase or decrease over 3pi/2 <= x <= 2pi the area under the graph from 0 to pi/2 is 1 the area under the graph from pi/2 to pi is...
*September 27, 2011*

**Geometry**

the measure of an angle is 7 less than 10 times its supplement
*September 27, 2011*