Sunday

April 19, 2015

April 19, 2015

Total # Posts: 1,583

**Chemistry**

In one trial of an investigation 50.0 mL of HCl(aq) of an unknown concentration is Tiresias with 0.10M NaOH (aq). During the titration the total volume of NaOH (aq) added and corresponding pH value of the reaction mixture are measured and recorded in the table below: 10mL-1....
*April 14, 2011*

**Chemistry**

What is the percent yield of a reaction in which 240. g phosphorus trichloride reacts with excess water to form 142 g HCl and aqueous phosphorus acid?
*April 13, 2011*

**Math**

okay thats what i wasnt sure of thanks
*April 13, 2011*

**Math**

write the equation in slope intercept form 6x+3y=12 i got y=2x+4 but i dont think i am right please HELP!!!
*April 13, 2011*

**Math**

OHHHH now i see thanks
*April 13, 2011*

**statistics**

what number is 16 percent of the variable y
*April 10, 2011*

**physics**

A trapdoor on a stage has a mass of 20.8 kg and a width of 1.51 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the ...
*April 10, 2011*

**physics**

In preparation for a demonstration on conservation of energy, a professor attaches a 8.7-kg bowling ball to a 3.2-m-long rope. He pulls the ball 18° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that the force he ...
*April 10, 2011*

**Physics URGENT!!!!**

1.A 75 kg passenger in a van is wearing a seat belt whent he van moving at 15m/s, collides with a conrete wall. The front end of the van collapses 0.50 m as it comes to rest. a) what was the paseenger's kinetic energy before the crash b) What average force did the seat ...
*April 9, 2011*

**Physics: energy**

The spiral shaft in a grain auger raises grain from a farmers truck into a storage bin. Assume that the auger does 6.2 x 10*5 J of work on a certain amount of grain to raise it 4.2 m from the truck to the top of the bin.What is the total mass of the grain moved?
*April 9, 2011*

**Physics**

A boy on a bucycle drags a wagon full of newspapers at 0.80m/s for 30 minutes using a force of 40N. How much work has the boy done?
*April 8, 2011*

**calculus**

find the derivative f(x)= 8ln(x^5-2x)
*April 7, 2011*

**calculus**

suppose a price-demand function p(x) is defined implicitly by x= p^3-3p^2+200 find p'.
*April 7, 2011*

**8th grade math**

The Exotic Pets Club has 23 members, all of whom have a snake, an iguana, or a tarantual. Four members have all three kinds of pets. Ten members have a snake, 14 have iguanas, and 13 have tarantulas. Two have a snake and an iguana, three have an iguana and a tarantula, and one...
*April 7, 2011*

**chemistry**

Write the overall ionic equation and the net ionic equation for the reaction between BaCl2 and Na2SO4 in aqueous solution, indentify the spectator ion and the precipitate ion for this reaction. help :(
*April 6, 2011*

**Chemistry**

Write the equation for the dissolution of (NH4)2S04 in water. How many moles of each type of ion, and how many total moles of ions does the dissolution of 0.5 mol of (NH4)2S04 produce? help pleaseeeeee ASAP
*April 6, 2011*

**Math**

Let R be the plane region bounded by x=1, x=5, the x-axis and y=1/x. Approximate the are of R using 8 right rectangles.
*April 5, 2011*

**Trig**

What is the exact value of sin^-1(sin(8pi/15)?
*March 30, 2011*

**Science**

How many times a year does the moon go through its cycle or phases?
*March 28, 2011*

**english**

what other ideas does Tom Corbett have in place to save money in PA?
*March 28, 2011*

**science**

How many times a year does the moon go through its cycle or phases?
*March 28, 2011*

**physics **

A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the boiling point of water...
*March 27, 2011*

**english**

so they agree with the plan because it will provide money for rebuilding prisons
*March 22, 2011*

**english**

How does the GOP feel about Tom Corbett decision to cut education funding for schools in Pennsylvania?
*March 22, 2011*

**psychology 101**

Kohlberg’s 6 stages of moral development 1. Punishment and Obedience 2. Mutual Benefit 3. Interpersonal Expectations 4. Law and Order 5. Legal Principles 6. Universal Moral Principles Based on a individuals reason to follow moral decisions Piaget’s theory of moral ...
*March 21, 2011*

**psychology 101**

what are the difference between one another
*March 21, 2011*

**psychology 101**

List and compare Kohlberg’s 6 stages of moral development and Piaget’s theory of moral development.
*March 21, 2011*

**math**

24.94189, 24.94199, 24.9419, 24.942
*March 21, 2011*

**physics**

note, it's supposed to be 1 atm=10^5 Pa
*March 20, 2011*

**physics**

An rectangular above-ground swimming pool is 9 m long and 4 m wide. The pool wall has a constant height of 3 m above the ground. Take atmospheric pressure to be 1 atm = 105 Pa and g = 10 m/s2. (a) Calculate the weight of the air that fills the pool when the pool is empty. (...
*March 20, 2011*

**Math Trig**

Find all solutions on the interval [0,2pi] for the following: 2sin^2(x)-5sin(x)=-3 cos^2(x)+sin(x)=1
*March 14, 2011*

**Trig**

How do you find the solutions?
*March 14, 2011*

**Trig**

no it's 2cosx-sqrt3=0
*March 14, 2011*

**Trig**

Finding all Solutions for 2cos(x)-ã3=0
*March 14, 2011*

**Trig**

sin^2x/sec^2x-1
*March 14, 2011*

**Math**

Find the exact value of Sin^-1(sin(13pi/15))
*March 14, 2011*

**AP Spanish **

Compare and contrast The Rising by Bruce Springsteen and Thursday from La Oreja de VanGogh.? I know the songs are about the September 11 tragedy in the U.S and the March 11 tragedy in Spain. Include comments and views of the role of each song.
*March 13, 2011*

**Physics**

Can you please show me how these answers are reached. A fully loaded Cessna-182 airplane of mass 1290 kg has an engine failure when flying with an airspeed of 139 km/h at an altitude of 2670m on a calm day. It then glides at a constant glide angle (which is the direction of ...
*March 11, 2011*

** geometry**

Could we multiply the following dimensions 9yards x 6 yards x 3 yards and then convert the final answer into cubic feet?
*March 10, 2011*

**geometry**

if I had a prism with the dimensions of 9 yards x 6 yards x 3 yards what is the deminsion in cubic feet?
*March 9, 2011*

**physics**

An airplane is flying horizontally with a speed of 1000 km/hr (278 m/s) when it drops a payload. The payload hits the ground 37 s later. (Neglect air drag and the curvature of the Earth. Take g = 10 m/s2.) (a) At what altitude H is the airplane flying?
*March 4, 2011*

**physics**

Calculate the value of g for a satellite that is orbiting in a circle at an altitude equal to 3 Earth radii. also, along the same lines, A typical shuttle altitude is 220 km. Calculate the value of g at this altitude. The the mass of the Earth = 5.98 x 10^24 kg and the radius ...
*March 3, 2011*

**calculus**

find all horizontal and vertical asymptotes of f(x)=2x^2+7x+12/2x^2+5x-12
*March 3, 2011*

**physics**

ok, i tried that and it's still giving me the wrong answer. On one of the hints it says path/time. I'm so lost, haha
*March 3, 2011*

**physics**

If the rotational speed of each wheel is 9 revolution per second, what are the tangential speeds of a point on the rim of each wheel? Note: Wheels spin independently with equal rotation speeds -Diameter of Wheel A: 24 -Diameter of Wheel B: 12
*March 3, 2011*

**physics**

If the rotational speed of each wheel is 9 revolution per second, what are the tangential speeds of a point on the rim of each wheel? Note: Wheels spin independently with equal rotation speeds -Diameter of Wheel A: 24 -Diameter of Wheel B: 12
*March 2, 2011*

**calculus**

A company manufacturing surfboards has fixed costs of $300 per day and total costs of $5100 per day for a daily output of 20 boards. Assume the total cost per day C(x) is linearly related to the total output per day x. Write an equation for the cost function, and write an ...
*February 28, 2011*

**calculus**

Find all horizontal and vertical asymptotes of f(x)= 2x^2 + 7x + 12/ 2x^2 + 5x - 12
*February 28, 2011*

**calculus**

x^6<16x^4
*February 28, 2011*

**Mathematics**

Please help, I need this ASAP.
*February 27, 2011*

**Mathematics**

Which set of ordered pairs are on the graph of the function y = 1/2 x - 2 ? F (-4,0) , (6,-5 ) G (-4,0) , (6, 5 ) H (4,0) , (6,-5 ) J (4,0) , (6, 5 ) Help ? Please.
*February 27, 2011*

**Mathematics**

Thanks so much ! Helper and Ms.Sue :]
*February 27, 2011*

**Chemistry**

What? If anything, is wrong with the following sets of quantum numbers. a. n = 2, l = 2, ml = 0, ms = +1/2 b. n = 0, l = 0, ml = 0, ms = -1/2 c. n = 3, l = 2, ml = -2, ms = +1/2 d. n = 4, l = 2, ml = 2, ms = -1/2
*February 27, 2011*

**physics**

A jet flying at 132 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 1.68 × 105 kg. Calculate the magnitude of the necessary lifting force.
*February 24, 2011*

**third grade hw help**

Hello All, Please help my son with his Math fraction. He needs to put the below fractions in ordedr from least to greatest. 1) 2/4, 2/3, 2/7, 2/5 2) 1/2, 6/7, 5/7, 1/10 3) 1/2, 6/7, 1/12, 2/3, 11/12, 1/6, 1/3, 1/4, 4/5 Please help!!! Thanks.
*February 24, 2011*

**3rd grade math hw help!**

Hell All, Please help my son with his Math fraction. He needs to put the below fractions in ordedr from least to greatest. 1) 2/4, 2/3, 2/7, 2/5 2) 1/2, 6/7, 5/7, 1/10 3) 1/2, 6/7, 1/12, 2/3, 11/12, 1/6, 1/3, 1/4, 4/5 Please help!!! Thanks.
*February 24, 2011*

**calculus**

The fee per ton of pollution is given by A(x) = F(x)=x. Write a piecewise de nition of A(x). What is the limit of A(x) as x approaches 4,000 tons? As x approaches 8,000 tons?
*February 24, 2011*

**calculus**

Given f(x) = x^3, evaluate lim h-->o f(a+h)-f(a)/h
*February 24, 2011*

**Science**

What happens first in a lunar eclipse?
*February 23, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...
*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...
*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...
*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...
*February 22, 2011*

**physics**

A loop of wire is lying flat on a tabletop. A uniform magnetic field is directed vertically UPWARDS such that it is perpendicular to the tabletop (and the loop). Beyond the edge of the table, the magnetic field is zero. Imagine that you are looking DOWN on the loop from above...
*February 22, 2011*

**Physics**

A person on top of a wall of height 3.4 m stands near the edge, leans over and tosses a putty wad of mass 1.3 kg vertically into the air as shown in the figure below. The wad reaches a maximum of 4 m above the top of the wall. The wad then comes down and hits the ground near ...
*February 20, 2011*

**English**

In the sentence "The Komodo's teeh are dangerous to everyone." Is the prepostional phrase to everyone which describes dangerous making in an adverb? Thanks!
*February 20, 2011*

**English**

IN the sentence "The ora does not interest poachers around the island" Is the prepositional phrase around the island and does it describe poachers which makes it an adjective?
*February 20, 2011*

**maths**

123 feet
*February 18, 2011*

**reading**

reading i think?
*February 17, 2011*

**Please help me**

what are parts of a poem?
*February 17, 2011*

**psychology**

so it can basically just make their neurons may begin to malfunction,
*February 15, 2011*

**psychology**

the effects of sleep deprivation on one’s behavior.
*February 15, 2011*

**math**

thank you
*February 9, 2011*

**math**

6.4 - y = 6 2/5 what is y?
*February 9, 2011*

**math**

6.4 - y = 6 2/5
*February 9, 2011*

**math**

1 1/2+ p)*2^2=12 what is p?
*February 9, 2011*

**math**

example:((5+6)+2)/4=8
*February 9, 2011*

**Physics**

In two successive chess moves, a player first moves his queen four squares forward, then moves the queen five steps to the left (from the player’s view). Assume each square is 2.0 cm on a side. Using forward (toward the player’s opponent) as the positive -axis and ...
*February 8, 2011*

**3rd grade math hw help!**

Please help! Name three ways the Roman and American coins are alike? Thanks.
*February 3, 2011*

**calculus**

Use the Intermediate Value Theorem to prove that the equation has a solution. Then use a graphing calculator or computer grapher to solve the equation. 2x^3-2x^2-2x+1=0 i am completely lost & have no idea where to start.
*February 3, 2011*

**Earth Science**

Divide the following list of words into 2 categories: drumlin, kettle lake, mafic, devonian, asthenosphere, gradient, fossil, topography, plateau, marlble For each category, give it a title (1-2 sentences)
*February 2, 2011*

**3rd grade math hw help!**

hello all, my daughter come home with a math homework "Alphabet Polygons" I have no idea how to use the letters in the alphabet to answer the questions. Please HELP! The questions are as follow: 1) You can make polygons of some of the letters by drawing just one more...
*January 31, 2011*

**Pre Algebra**

How do you draw and lable a circle that has an area between 5 and 8 square units?
*January 31, 2011*

**calculus**

limit as x approaches 2 where f(x)=5x-5 Find a δ such that | f (x) - 5 | < 0.01 if | x - 2 | < δ. (Give your answer correct to 4 decimal places.) Need helpp!!! I have no idea how to do it. and nobody that can help!!
*January 30, 2011*

**physics2**

A Gaussian surface encloses two charges. The total electric flux through the Gaussian surface is 8.3 x 106 N m2/C. If one of the charges is -14.9 micro-Coulombs and the magnitude of the electric force between them is 2.76 Newtons, what is the distance between the charges in ...
*January 29, 2011*

**physics2**

Charges are placed on an equilateral triangle (all angles are equal and equal to 60 degrees). The length of each side of the triangle is 5.7 meters. A charge of +7.1 micro-Coulombs is placed at the bottom corner of the triangle and another charge of +7.1 micro-Coulombs is ...
*January 29, 2011*

**physics2**

A charge of +q is placed at y = 0 m. Another charge of +2q (twice the other charge) is placed at y = +6.52 meters. Where on the y axis is the total electric field zero?
*January 29, 2011*

**physics2**

A charge of -6.5 micro-Coulombs is placed at the origin of a coordinate system. Another charge of -7.6 micro-Coulombs is placed at x = +0.29 m, y = +0.17 m. A third charge of +14 micro-Coulombs is placed at x = -0.29 m, y = 0 m. What is the magnitude of the total electric ...
*January 29, 2011*

**physics2**

A uniform electric field of 2.1 x 106 N/C is directed in the positive x direction. A charge of -4.3 micro-Coulombs with a mass of 7.5 kg is initially moving at 18 m/s in the positive x direction before it enters the field. How many seconds does it take before the charge stops?
*January 29, 2011*

**algebra**

what is 2z^2
*January 27, 2011*

**ap chem**

1)determine the molality for an antifreeze solutions. Kf for water is 1.86 C/m in the experiment we found the freezing point of the antifreeze it was 1.2 C 2) Determine the molar mass. 5.00g of antifreeze/50g of water 3)calculate percent error.
*January 24, 2011*

**calculus**

g(t)=2+cos t; [0,pi] Can you help me find the average rate of change of the function over the given interval?
*January 20, 2011*

**Physics**

Ignorant of the local custom of offerings strangers outrageous prices and then negotiating down, the clothing maker accepts the initial price 400 tepizes/m^2. The price of this cloth in New York is 120 dollars/yard^2. If the clothing maker bought 500 m^2 of this fabric, how ...
*January 18, 2011*

**Physics**

I am driving to Atlanta on the I-85 in my G35 Coupe at 40.0 m/s and I pass a cop. Will I get a ticket? The speed limit is 70.0 mi/h, 1 mile= 1.609 km = 1609 m.
*January 18, 2011*

**math helper plese**

2 isosceles triangles have the same height. The slopes of the sides of triangle A are double the slopes of the corresponding sides of triangle B. How do the lengths of their bases compare? A. The base of A is quadruple that of B. The base of A is double that of B. C. The base ...
*January 17, 2011*

**writing**

Write a 100-word passage to Susan Anker, the author of the course’s textbook, in which you describe five details from her book that are good and five details about the book that are written well.
*January 16, 2011*

**science**

i don't know but i went to google and they don't know. sorry ask a older broter or older family member.
*January 11, 2011*

**Math**

My son's math homework asks him to find each product by factoring the tens. 6 x 2, 6 x 20 and 60 x 20. There is no explaination in the book..can you help?
*January 4, 2011*

**Algebra 1**

Mars has a mass of 6.5 x 10 to the power of 23 kg and the sun has a mass of 1.99 x 10 to the power of30 kg. How many orders of magnitude greater than Mars’s mass is the sun’s mass
*January 4, 2011*

**physics**

What is the mass of a marble cylinder with a diameter of .42m and a length of 1.25m?
*January 4, 2011*