Thursday

November 26, 2015
Total # Posts: 218

**Chemistry**

4.80 L of N2, at 25 ∘C and 1.22 atm , is mixed with 1.80 L of O2, at 25 ∘C and 0.122 atm , and the mixture allowed to react. N2(g)+O2(g)→2NO(g) How much NO, in grams, is produced?
*November 6, 2015*

**Geometry**

prove that if the lengths of two sides of a and b, triangle are a and b respectively, then the lengths of the corresponding altitudes to those sides are in the ratio b/a.
*November 4, 2015*

**Science**

What type of water evaporates quicker:well water or salt river water?
*November 1, 2015*

**physics**

A 2.6 kg toy locomotive is pulling a 1.7 kg caboose. The frictional force of the track on the caboose is 0.52 N backward along the track. If the train is accelerating forward is 3.1 m/s2, what is the magnitude of the force exerted by the locomotive on the caboose? How would I ...
*October 29, 2015*

**Physics**

A 20-kg child running at 1.4 m/s jumps onto a playground merry-go-round that has inertia 180 kg and radius 1.6 m. She is moving tangent to the platform when she jumps, and she lands right on the edge. Ignore any friction in the axle about which the platform rotates.
*October 19, 2015*

**Physics**

So, vf = final velocity = 5.01m/s vi = initial velocity = 23.5m/s a = acceleration = -2.12m/s^2 d = distance I plugged everything in and got 0.045. Is this the correct way to solve? 5.01^2 = 23.5^2 + 2(-2.12)d 25.1001 = 548.01d d = 25.1001/548.01 Thanks!
*September 16, 2015*

**Physics**

Thank you! I was stuck on this problem
*September 16, 2015*

**Physics**

A train is traveling south at 23.5 m/s when the brakes are applied. It slows down with a constant rate to a speed of 5.01 m/s in a time of 8.73 s. How far does the train travel during the 8.73 s? I have already found -Acceleration during braking: -2.12m/s
*September 16, 2015*

**math**

Find the smallest positive integer n for which 126n cube root is a whole number
*September 10, 2015*

**math**

(18.6)-y
*August 30, 2015*

**math**

translation for y less than 18 times 6
*August 30, 2015*

**math**

15x-12
*August 30, 2015*

**math**

yes. thanks
*August 30, 2015*

**math**

translation of 12 less than 15 time x
*August 30, 2015*

**math**

I got the same answer 100/w
*August 30, 2015*

**math**

translation of the quotient of 100 and w
*August 30, 2015*

**math**

the product of a number and 35
*August 30, 2015*

**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*

**Math**

Write a subtraction equation with a difference of 54.57. Then draw a number line to show between which two whole numbers the difference lies
*October 21, 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*

**health**

ashworth got that rep lol
*August 11, 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*