Saturday

August 2, 2014

August 2, 2014

Total # Posts: 2,151

**chemistry**

Using standard heat of formations. (Appendix II in text). Calculate the standard enthalpy change for the combustion of methane. CH4 (g) + 2 O2 ---¨ 2CO2(g) + 2H2O (l) ƒ¢H0 = ?

**Chemistry**

Calculate the [H+], [OH ‾ ], and the pH of 0.16 M solutions of: hydroxylamine (HONH2, Kb = 1.1 10-8)

**Chemistry**

Calculate the pH of a 5.90x10-3 M solution of H2SO4.

**Chem Acids/Bases**

A 25.00 mL sample of H3PO4(aq) requires 31.05 mL of 0.2410 M KOH for titration to the second equivalence point. What is the molarity of the H3PO4(aq)?

**Chemistry**

Write the dissociation reaction and the corresponding Ka equilibrium expression for each of the following acids in water. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer. Omit water in your answer.) (a) HC_2H_3O_2 (b) Co(H2O...

**principles of physics**

A carnival has a Ferris wheel where the seats are located halfway between the center and outside rim. If you were at the outside rim, your angular speed while riding on this Ferris wheel would be A) more and your tangential speed less.B) less and your tangential speed more.C)...

**principles of physics**

If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital path of the moons.C) o...

**principles of physics**

Very ideally, and very strictly speaking, the falling leaves in autumn make the world spin a bit ____________________. A) All of these.B) faster.C) slower.D) off center and erratic.E) smoother.

**principles of physics**

When a skater brings her arms in when spinning, she increases her ____________________. A) angular speed.B) Both of these.C) Neither of these.D) angular momentum.

**principles of physics**

The main reason railroad trains remain on their tracks has to do with the ____________________. A) None of these.B) beveled shape of the wheel circumference.C) independence of opposite wheel motions.D) All of these. E) flange on their wheels.

**principles of physics**

When we studied the concept of work, we learned that work = force x distance. Now we learn that torque = force x distance. What's different about these two definitions?A) For work, distance and force are in the same direction; for torque they are perpendicular to each othe...

**physics**

An 840 Kg roller coaster car is launched from a giant spring of constant k=31 kN/m into a frictionless loop-the-loop track of radius 6.2 m, as shown below. What is the minimum amount that the spring must be compressed if the car is to stay on the track?

**Math -Tutor help only please! **

Solve: 2/12x-3/12=8/12 Is x = 11/2 the correct answer?

**Math**

Solve: 3 - x = 12(x - 1) Is the correct answer x = 15/13?

**chemestry**

Calculate [OH^ - ] for strong base solution: 14.0 mL of 1.20×10−2 M Ca(OH)_2 diluted to 430.0 mL.

**math**

use I and a dot to show the number 52

**math**

I have a math question abdedbabde 1234321234 how do I do this problem

**biology**

Regulation of an enzyme's activity occurs a) before the enzyme is produced b) during the production of the enzyme. c) when the enzyme already exists in the cell. d) at any point on the enzymatic production pathway. Thank you

**Physics**

You push a 2.5 kg block against a horizontal spring, compressing the spring by 16 cm. Then you release the block, and the spring sends it sliding across a tabletop. It stops 60 cm from where you released it. The spring constant is 200 N/m. What is the block-table coefficient o...

**Math**

the green bay packers ordered roast beef subs and turkey subs for lunch. a total of 53 subs were ordered. the number of roast beef subs ordered is 2 more than twice the number of turkey subs. write and solve a system of linear equations to determine how many roast beef subs x ...

**math**

2/3 x 3 top and bottom you get 6/9 + 7/9 = 13/9 = 1 and 4/9 .

**algebra**

i need to know how to do (4m -3power n5power)0 / mn

**math**

divide eight pounds of sand into twelve equal containers. how much in each container?

**math**

Mary's test grades were 81, 89, 86, 86, and 84. Mary's teacher recorded one of her grades incorrectly. Instead of an 89, Mary's second test score should have been a 55. Which measure(s) of central tendency are affected by this change?

**English**

Hi, I am trying to analyze this poem. It is called "On watching politicians perform at Martin Luther king's funeral". It is by Etheridge Knight who is a black poet who was active mostly in the 60s and 70s. Here is the poem. Hypocrites shed tears like shiny snake ...

**Physics**

A smooth plane AB is 10 meters long, It is inclined at 30 degrees to the horizontal with the lower end, B, 6 meteres vertically above horixontal ground. A particle is placed on the plane at the upper end, A, and then released from erst so that it slides down the plane. Find th...

**Physics**

A particle is at rest at the apex A of a smooth fixed hemisphere whose base is horizontal. The hemisphere has centre O and radius a. The particle is then displaced very slightly from rest and moves on the surface of the hemisphere. At the point P on the surface where angle AOP...

**algebra**

Which value of x makes the following equation true? 7.8(x - 2) = -0.2x + 40.4

**algebra**

1m=430

**math-word problem**

admission to a park is $5 for an adult ticket and $1 for a child. If $100 was collected and 28 admissions were sold on a day, how many tickets were sold and how many child tickets were sold

**math**

admission to a park is $5 for an adult ticket and $1 for a child. If $100 was collected and 28 admissions were sold on a day, how many tickets were sold and how many child tickets were sold

**math unit rate question**

the answer to question 1 is a tie and how many yards is 0.the answer to the second question is 10 yards behind the finishing line.

**business**

i am researching the prepackaged software industry and i need to find what the future holds for that industry.

**pine glenn**

If I have total of 63 brushes and there is six times as many orange that white how many orange do I have and how many white? how do I solve

**Calculus**

"Two cars are traveling along perpendicular roads, car A at 40mph, car B at 60mph. At noon, when car A reaches the intersection, car B is 90miles away, and moving toward it. At 1PM the distance between the cars is changing at what rate?" So lost! Please help!

**physics**

An airplane is flying horizontally at 115 m/s, at a 20.5 degree angle north of east. State its velocity in rectangular coordinates. Assume that north and east are in the positive direction.

**Trigonometry**

In a right triangle, CT = 6, CA = 3, and m<CAT = 90. What is the value of cot C ? CT= hypo CA= Opp.

**Physics**

A small ball is launched at an angle of 30.0 degrees about the horizontal. It reaches a maximum height of 2.5m with a respect to the launch position. What is the initial velocity of the ball when its launched? What is the range, defined as a horizontal distance traveled until ...

**COM 1001**

Wait it is any form of communication that is not face to face

**COM 1001**

I have no idea that is what has me super stumped I have read the two chapters over and over again

**COM 1001**

I have no idea that is what has me super stumped I have read the two chapters over and over again

**COM 1001**

How do the components and processes of communication apply to the electrnic/computer channel?

**math**

From the Periodic Table, 1 mole of aluminum weighs 27.0 g., Therefore; If 54.0 g of aluminum are placed into the beaker to react with copper(II) chloride, how many grams of the metal product will be produced?

**Science**

A glass window 0.50 cm thick measures 86 cm by 31 . How much heat flows through this window per minute if the inside and outside temperatures differ by 17 ? Express your answer using two significant figures. Q/t=_________kJ/min

**MATH**

For which value of x will the fraction 7/2x-6 be undefined? HOW TO DO THIS ?

**MATH**

for which value of X will the fraction 7/2x-6 be undefined ? and check this IF three times a number decreased by 5, the result is 7. find the number. 3x-5=7 and x=4 is this right?

**Finance**

The answer is $1,086,250

**calculus**

Yes, I know, but I i had question about the answer... I'm math stupid :)

**calculus**

Damon help again :) (last one I promise) why is X along the road sqrt2/2? ] A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the ...

**Calculus**

Damon, Help :) A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the rancher decides to use a better quality wood for that side wh...

**Calculus**

A rancher plans to set aside a rectangular region of one square kilometer for cattle and wishes to build a wooden fence to enclose the region. Since one side of the region will run along the road, the rancher decides to use a better quality wood for that side which costs three...

**Physics**

false, its called the coriolis effect

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.86 m. The stones are thrown with the same speed of 9.78 m/s. Find the location (above the base of the clif...

**physics**

The velocity of a diver just before hitting the water is -11.1 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 1.18 s of the dive?

**physics**

A drag racer, starting from rest, speeds up for 384 m with an acceleration of +19.3 m/s2. A parachute then opens, slowing the car down with an acceleration of -6.33 m/s2. How fast is the racer moving 302 m after the parachute opens?

**history**

Thank you .

**Law**

Yes it is C. Read the Land Pollution Section at: "classweb.gmu.edu/rcoffinb/Chapter%2017%20Outline.htm"

**algebra**

9z^2+24z+16/6z^2+5z-4

**physical science**

One of Saturn's moons has an orbital distance of 1.87 x 108 m. The mean orbital period of this moon is approximately 23 hours. Use this information to estimate a mass for the planet Saturn.

**science**

What is the ratio of the large cell volume is 64mm3 and surface is 96mm2

**science-biology**

biology-forums(dot)com/index.php/topic,10448.new.html#new

**calculus**

Correction its not 2. It's 1/72 ft lbs

**calculus**

The answer is 2 a = 0 (start of the spring) b = 1 integrate 4x then plug in the limits (0 and 1)

**calculus**

The height (in feet) attained by a rocket t seconds into flight is giving by the function h(t)= -1/3t^3 + 16t^2 + 33t + 10 When is the rocket rising? When is the rocket decreasing? when does it reach its maximum height above the ground? what is the maximum height? what is the ...

**calc 2**

The height (in feet) attained by a rocket t seconds into flight is giving by the function h(t)= -1/3t^3 + 16t^2 + 33t + 10 When is the rocket rising? When is the rocket decreasing? when does it reach its maximum height above the ground? what is the maximum height? what is the ...

**calc**

a stone is thrown striaght up from the roof of an 80 foot building. the height of the stone above the ground t seconds later is giving by the function h(t)=-16t^2 + 64t +80 during what time is the stone rising? when is the stone falling? what is the maximum upward velocity? wh...

**chemistry**

Volume of 0.185 mol . L-1 and 0.74 M

**chemistry**

Air dry weight of MgNH4Po4 * 6 H2O

**English**

Ms. Sue, thanks for your answer. Is there a rule in grammar that I can use to convince someone that #2 is correct? Which one is correct: 1. The box contains two slides labeled "A" or "B". 2. The box contains two slides labeled "A" and "B".

**english**

Ms. Sue, is there a rule for this that I can use to justify your answer. I have a hard time convincing a colleague that you are correct.

**english**

which one is correct: 1. the box contains two slides labeled "A" or "B" 2. the box contains two slides labeled "A" and "B"

**physics**

A 450 kg spherical mass is placed 4.40 meters away from a 550 kg spherical mass. What is the magnitude of the gravitational field midway between the two? ...... Im not quite sure how to do this any help would be appreciated.

**Chemistry**

An oil whose density is 0.775g/mL was used in a open-end manometer to measure the pressure of a gas in a flask, as shown in figure (b). If the height of the oil column is 7.68cm and Pbar = 760.0mmHg. What is the pressure of the gas in the flask in mmHg?

**Science**

what is a dilute solution

**English**

Soldiers carried several days cold nations. should days chage to a possessive noun from days to days'

**Algebra**

Solve and simplify: x^2+14x-4=0

**Algebra**

Add, simplify if possible 4y/y^2-9 + y/y-3

**Algebra**

Solve sqrt:9x+55=x+5, Simplify and use comma to separate the answers

**Chemistry**

I have a compound (mx) weak acid (x- = Hx) mx in 5M strong acid solution solubility = 5x10(-3) Ksp = 1x10(-20) Find Ka... I need to know where to start

**Math**

Classify triangle ABC by its sides if side AB = 6x, side AC = 4x + 6 and side BC = 8x + 3. The perimeter of triangle ABC is 63. Show all your work. Explain your reasoning.

**geometry**

A wire 10 meters ong is to be cut into two pieces. One piece wil be shaped as a square, and the other piece will be shaped as a circle. (piece one is 4x, piece two is 10-4x) a)Express the total area A enclosed by the pieces of wire as a function of the length x of the side of...

**fraction 10-1 math **

3/7 are red

**Physics**

Michelson used a rotating eight sided mirrored "wheel" to determine speed of light. In this case the mirror is rotated at a certain frequency which allows light to travel from the source, reflect off the mirrored wheel and into the observers eyes. What is the minimum...

**Social studies**

What stands on a hill called acropolis in for 2500 years in Greece

**geometry**

In ∆RST, RS = 10, RT = 15, and m∠R = 32. In ∆UVW, UV = 12, UW = 18, and m∠U = 32. Which of the following statements is correct? 1. ∆RST ∼ ∆WUV and the similarity ratio is 56. 2. ∆RST ∼ ∆UVW and the similarity ratio is...

**Physics**

Find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 5.1×104 times the acceleration of gravity. The distance from the axis of rotation to the bottom of the test tube is 7.7 .

**Physics**

Jill of the Jungle swings on a vine 6.4 long. What is the tension in the vine if Jill, whose mass is 59 , is moving at 3.0 when the vine is vertical?

**Physics**

Find the centripetal acceleration at the top of a test tube in a centrifuge, given that the top is 4.5 from the axis of rotation and that its linear speed is 76 .

**Physics**

Driving in your car with a constant speed of 12 , you encounter a bump in the road that has a circular cross-section, as indicated in the figure . If the radius of curvature of the bump is 35 , find the apparent weight of a 70- person in your car as you pass over the top of th...

**Physics**

When you take your 1000- car out for a spin, you go around a corner of radius 57 with a speed of 19 . The coefficient of static friction between the car and the road is 0.88. Assuming your car doesn't skid, what is the force exerted on it by static friction?

**Physics**

A 8.0×10−2- toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 in a horizontal circle of radius 0.49 , as illustrated in the figure . Find the angle the string makes with the vertical....

**Physics**

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?

**Physics**

A 6.5- bowling ball and a 7.1- bowling ball rest on a rack 0.80 apart. Part A- What is the force of gravity exerted on each of the balls by the other ball? Part B- At what separation is the force of gravity between the balls equal to 2.2×10−9 ?

**Physics**

A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 3.7×104 as measured from the center of the Earth. Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.

**History**

What language was spoken/written by the venerable bede/ pre Beowulf period?

**art**

ddddddddddsssssssssssssfffffffffffff

**ecology**

what is the single most important determination of plant distribution?

**Math**

(-4,8);6x=7y+3 Write the equation of the line containing the given points and parallel to given line express your answer in y=mx+b form

**Engineering**

-From the following two linear homogeneous algebraic equations:(sqr= square root) (1) B*sin(kl/sqr2) = D*sin(kl) (2) (k/sqr2)*B*cos(kl/sqr2) = (k)*D*cos(kl) -Form matrix of these 2 equations and solving the determinant=0 will lead to: (1/sqr2)*cos(kl/sqr2)*sin(kl) - sin(kl/sqr...

**English**

Thanks Ms. Sue

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