Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 1,506

**Chemistry**

How many grams of BaCO3 will dissolve in 3.0 L of water containing a Ba+2 concentration of 0.5 M (Ksp= 5.1E-9) My work: BaCO3 <-> Ba+ + CO3- i 0.5 M c -s +s +s e 0.5 +s +s (s)(0.5+s)= 5.1E-9 s= 1.0E-9mol/L x 3.0 L x 197.336 g/L= 5.92E-6 grams of BaCO3 dissolved ^Is this ...

**Physics**

Two students are on a balcony 19.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.8 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down...

**Chemistry**

How do I take into account the change in volume?

**Chemistry**

How do I take into account the change in volume?

**Chemistry**

Calculate the pH of teh 0.20 M NH3/0.20 M NH4Cl buffer. What is teh pH of the buffer after the addition of 10.0 mL of 0.10 M HCl to 65.0 mL of the buffer?

**biology**

Discuss possible benefits and drawbacks of a transgenic organism such as Bt corn?

**chemistry**

In the chemical equation wA+ xB-> yC+zD, a comparison of the number of moles of A to the number of moles of C would be a?

**Math**

A pond 100 ft in diameter is surrounded by a circular grass walk 2 feet wide. Find the are of the walk. Answer in terms of π. Please help me! TY

**Earth Science**

Which of the following layers of the atmosphere is closest to the ground?

**earth**

Atmosphere Homework! 1.Which of the following layers of the atmosphere is closest to space? 2.A barometer measures? 3. The atmosphere contains tiny solid particles called what? 4.The process by which the atmosphere slows Earth's loss of heat to space is called the ..? 5.Al...

**2nd Grade Math**

Jordan spent $6.37 on a book and $1.23 on a magazine. How much did he spend all together? First estimate the costs and the totals. _____+______=______ Then use partial sums and solve. _____

**algebra help**

(-2,2) (4,20) Find the value of x when y is 9.

**accouting**

Company E December 31, 2010 Assets $42,000 $32,760 $26,880 $74,760 $114,660 Liabilities 34,440 22,932 14,515 51,584 ? December 31, 2011 Assets 45,000 32,400 ? 81,900 124,200 Liabilities ? 22,032 14,773 39,312 98,118 During year 2011 Stock issuances 6,000 1,400 9,750 ? 6,500 Ne...

**chemistry**

in the chemical equation :2C2H6+7O2->4CO2+6H2O, hOW many moles of c2h6 will you need to form 2.34 mol of co2? How many moles of water will be produced?

**HSM 220 Week 6 Budget Matrix**

I am having some help with this assignment. I have filled it in with what I think is correct but am not positive with my answers. Can someone please help me? The assignment is due tomorrow (4-21-11) Budget Matrix You are the executive director of a local government workforce a...

**math**

How do you find one fourth or two thirds?

**English**

Write a story using the words alcove, bigoted, clandestinely, corrugated, futile, inexorably, plausible, ramification, sanguine, and scrutinized. It can be any version of the word and they can be in any order.

**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-1.6p...

**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?

**Math**

okay thats what i wasnt sure of thanks

**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!!!

**Math**

OHHHH now i see thanks

**statistics**

what number is 16 percent of the variable y

**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 doo...

**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 exert...

**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 bel...

**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?

**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?

**calculus**

find the derivative f(x)= 8ln(x^5-2x)

**calculus**

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

**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...

**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 :(

**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

**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.

**Trig**

What is the exact value of sin^-1(sin(8pi/15)?

**Science**

How many times a year does the moon go through its cycle or phases?

**english**

what other ideas does Tom Corbett have in place to save money in PA?

**science**

How many times a year does the moon go through its cycle or phases?

**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?...

**english**

so they agree with the plan because it will provide money for rebuilding prisons

**english**

How does the GOP feel about Tom Corbett decision to cut education funding for schools in Pennsylvania?

**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 de...

**psychology 101**

what are the difference between one another

**psychology 101**

List and compare Kohlberg’s 6 stages of moral development and Piaget’s theory of moral development.

**math**

24.94189, 24.94199, 24.9419, 24.942

**physics**

note, it's supposed to be 1 atm=10^5 Pa

**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. (Tak...

**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

**Trig**

How do you find the solutions?

**Trig**

no it's 2cosx-sqrt3=0

**Trig**

Finding all Solutions for 2cos(x)-ã3=0

**Trig**

sin^2x/sec^2x-1

**Math**

Find the exact value of Sin^-1(sin(13pi/15))

**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.

**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 fl...

** geometry**

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

**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?

**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?

**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 ...

**calculus**

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

**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

**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

**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

**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 equa...

**calculus**

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

**calculus**

x^6<16x^4

**Mathematics**

Please help, I need this ASAP.

**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.

**Mathematics**

Thanks so much ! Helper and Ms.Sue :]

**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

**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.

**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.

**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.

**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?

**calculus**

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

**Science**

What happens first in a lunar eclipse?

**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....

**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....

**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....

**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....

**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....

**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 t...

**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!

**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?

**maths**

123 feet

**reading**

reading i think?

**Please help me**

what are parts of a poem?

**psychology**

so it can basically just make their neurons may begin to malfunction,

**psychology**

the effects of sleep deprivation on one’s behavior.

**math**

thank you

**math**

6.4 - y = 6 2/5 what is y?

**math**

6.4 - y = 6 2/5

**math**

1 1/2+ p)*2^2=12 what is p?

**math**

example:((5+6)+2)/4=8

**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 ri...

**3rd grade math hw help!**

Please help! Name three ways the Roman and American coins are alike? Thanks.

**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.

**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)

**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...

**Pre Algebra**

How do you draw and lable a circle that has an area between 5 and 8 square units?

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