Sunday
February 14, 2016

# Posts by Ethan

Total # Posts: 225

Calculus
An architect wants to design a window in the shape of a rectangle capped by a semicircle. If the perimeter of the window is constrained to be 24 feet, what dimensions should the architect choose for the window in order to admit the greatest amount of light?
February 6, 2016

Algebra
How do you write the expression that represents the total length of each segment
January 20, 2016

math
rewrite each pair of unlike fractions as like fractions
January 6, 2016

PreCalculus - Need help, due tonight
1. Rewrite the expression 1/2ln(x – 6) + 3ln(x +1) as a single logarithm. 2. Rewrite the expression 1/3[ln x – 2ln(1 – x)] as a single logarithm.
December 7, 2015

Physics
A certain diving bell for use in the ocean has a square window measuring 0.250 m on each side. The inside of the bell is pressurized and maintained at a pressure of 2.00 atm. The mass density of seawater is 1025 kg/m3. How deep can this bell be lowered before the vector sum of...
December 6, 2015

Algebra
A company charges \$6 to make an pattern for an order of T-shirts and \$11 for each T-shirt it produces from the pattern. The expression \$11n+\$6 represents the cost of n T-shirts with the same pattern.Find the total cost for 5 T-shirts with the same pattern.
November 30, 2015

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

math
I will guess the length of the lace shall be larger than 51. It shall be larger than twice of the circumference. So I would say (3) 101.
February 9, 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

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

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

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