Monday

February 20, 2017
Total # Posts: 668

**Chemistry**

thank you

*February 19, 2017*

**Chemistry**

which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

*February 19, 2017*

**Chemistry**

Rxn 1: 4 NH3(g) + 5 O2(g) ? 4 NO(g) + 6 H2O(g) If the equilibrium constant, Kc, for Rxn 1 is 0.0015, determine the equilibrium constant, Kc, for the reaction: 2 NH3(g) + 5/2 O2(g...

*January 25, 2017*

**Grade 8 Lang Arts**

The story is "Trouble With Television" It has become fashionable to think that, like fast food, fast ideas are the way to get to a fast-moving, impatient public. How does the repetition in the sentence convey the author's negative attitude toward television. I ...

*December 7, 2016*

**8 Grd L.A.**

oops sorry hold on :)

*December 7, 2016*

**8 Grd L.A.**

How does the repetition in the preceding sentence convey the author's negative attitude toward television? I think it shows how the author thinks negatively about television.

*December 7, 2016*

**8 Grd L.A.**

"When before in human history has so humanity collectively surrendered so much of its leisure to one toy, one mass diversion?" How would you answer the rhetorical question? ____________________________________________________________________________ I'm thinking ...

*December 7, 2016*

**Chemistry**

why does chlorobenzoic acid have a lower freezing point than benzoic acid explain? would this have something to do with the intermolecular forces or polarity. I know that the chlorobenzoic acid a Cl atom in the molecule which would create for a stronger intermolecular force ...

*November 27, 2016*

**Chemistry**

What volume of 0.1244M hydrochloric acid is required to neutralize 24.81 ml of 0.1026M barium hydroxide? from the mole to mole ratio and the given information I came up with .00509 mols of HCl. would I multiply this by 0.1244 or divide by .1244. I'm not sure which would be...

*November 26, 2016*

**math**

4 1/2 x 2 1/4 =

*August 16, 2016*

**Social Studies**

yes

*May 18, 2016*

**math**

If you roll a number cube 40 times, about how often can you expect to roll a 2?

*May 18, 2016*

**Math**

I'm 96% positive the answer is 9/32

*May 18, 2016*

**Chemistry**

How do i find the PH and pOH of 12.5ml of 15.8M HNO3 added to 400ml of 0.57M KOH

*April 26, 2016*

**Chemistry**

I don't get what i have to do at all, or what the 1.20-2x=1.02 gives me?

*April 26, 2016*

**Chemistry**

Consider the reaction: 2H2+2NO->N2+2H2O. Initially 1.20mol of H2 and 0.95 mol of NO are placed in a container(all reactants and products are gases). If after 5 seconds the amount of H2 has been reduced to 1.02mol then how much NO is left and how much N2 and H2O has been ...

*April 26, 2016*

**Math/Precsl**

Solve: log(8y+12)=2

*April 25, 2016*

**Language Art, please check!**

Wow, thank you Ms. Sue! ;)

*April 22, 2016*

**Language Art, please check!**

1. Tiny Tim’s father, Bob Cratchit, works for Scrooge. What is the appositive in this sentence? Tiny Tim father Bob Cratchit *** Scrooge 2. The Ghost of Christmas Future, the third spirit, takes Scrooge to see his grave. What is the appositive phrase in this sentence? ...

*April 22, 2016*

**math**

is apportionment the best way to achieve fair representation?

*April 19, 2016*

**Chemistry**

If the percent yeild of the following equation is 55%, how many grams of H2SO4 are produced when 4.88 x 10^24 molecules of SO3 are combined with excess water? SO3(g)+H2O(l)->H2SO4(aq). what would be the formula to solve this equation

*April 10, 2016*

**Chemistry**

How many grams of pure uranium can theoretically be extracted from a 10.0 kg sample of pitchblende, which is 92.0% UO2? Im not looking for the answer. I would just like to know the formula to solve the problem.

*April 9, 2016*

**Chemistry**

A Partially weather balloon has a volume of 195 L at a pressure of 0.993 atm. What will be the pressure in the balloon when it is inflated to a volume of 7500 L? (assume to temp. change)

*April 8, 2016*

**Algebra**

I am really stuck with creating the equation

*March 25, 2016*

**Algebra**

A train covered the distance of 400 km between A and B at a certain speed. On the way back it covered 2/5 of the distance at that same speed and then it decreased its speed by 20 km/hour. Find the speed of the train at the end of its journey from B back to A, if the entire ...

*March 25, 2016*

**Algebra**

A tourist traveled on a motorboat against the current for 25 km. And then returned back on a raft. In the boat the tourist traveled for 10 hours less than on the raft. Find the speed of the current if the speed of the motorboat in still water is 12 km/hour.

*March 25, 2016*

**math**

Finn is 9 years younger than Pari. Pari is twice as old as Finn. How old is Finn?

*March 19, 2016*

**trig**

49.67

*March 18, 2016*

**trig**

93.33

*March 18, 2016*

**language arts**

what is the most impressive example of anne's inner strength in act 2?

*March 12, 2016*

**chemistry**

He has narrowed the identity of his unknown to either molecule X, molecule Y, or molecule Z. The Merck Index tells him that all three molecules produce white, needle-like crystals from ethanol. How might he definitively identify his unknown molecule?

*February 2, 2016*

**physics**

an operating 100-watt lamp is connected to a 120-volt outlet. what is the total energy used by the lamp in 60. seconds

*January 27, 2016*

**Math**

Upon retirement (in 40 years) you want to receive $10,000 each month for a period of 28 years. This money resides in an account that pays 5.9% interest. How much money must be in the account to fulfill your goal?

*December 2, 2015*

**Mathematics**

Show that the equation tanθ = sinθ can be written in the form sinθ(1 - 5cosθ) = 0?

*November 18, 2015*

**Mathematics**

Solve 2cos^2(x) + 4sin(x)-3 = 0, giving all solutions in the interval 0 ≤ x ≤ 2π

*November 18, 2015*

**Mathematics**

Given that 2cos^2 x - 3sin x -3 = 0, show that 2sin^2 x + 3sin x +1 = 0? Hence solve 2cos^2 x + 4sin x - 3 = 0, giving all solutions in the interval 0 ≤ x ≤ 2π

*November 18, 2015*

**Calculus**

A tennis ball is dropped from a height of 32 feet, rebounding to 1/2 its former height with each bounce. How far will the ball have traveled VERTICALLY when it comes to a rest?

*November 16, 2015*

**Algebra**

If a certain number is added to the numerator and denominator of 11/13, the result is 11/12. Find the number.

*November 4, 2015*

**Physics**

A block of 3kg is pulled up a smooth slope with a force of 24N and the slope is of an angle 25 degrees. Calculate the acceleration of the block up the slope.

*November 2, 2015*

**Physics**

A car traveling at a velocity of 2m/s undergoes an acceleration of 4.5m/s2 over a distance of 340m.How fast will it be going after the acceleration?

*October 29, 2015*

**Physics**

A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding tyres and the road is 0.8 of the weight of the ...

*October 25, 2015*

**Physics**

A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding tyres and the road is 0.8 of the weight of the ...

*October 25, 2015*

**Physics**

A man runs east 9.8 m/s for 11 s, stops for 6.9 s, then runs back (west) at 1.5 m/s for 1.2 s. What is the man's average velocity?

*October 8, 2015*

**Physics**

A soccer ball is kicked with resultant velocity of 22.6 m/s at an angle of 60 degrees. What is the time to Apex, what is the range of the kick? r = 22.6 angle = 60 degrees 1)Vxi=sin(60)(22.6) = 19.57 Vyi=cos(60)(22.6) = 11.3 2)T= Vyf-Vyi/A 0-11.3/-9.81 = 1.1 sec time to apex ...

*October 7, 2015*

**Math**

The circumference of a rear wheel of a carriage is 50 inches more than a front wheel. If the rear wheel makes as many revolutions in going 200 feet as the front wheel in going 120 feet, find the length of the circumference of each wheel.

*September 27, 2015*

**Math**

In a third game. Javier first two darts land in R what is the maximum possible score in this game

*September 23, 2015*

**geometry**

yes you're correct

*September 4, 2015*

**STATISTICS**

According to the DPT of Health Services , 12% of 30-39 have depression. Suppose 3 30-39 year olds are selected randomly what is the probability that all three will have depression.

*August 13, 2015*

**Math**

Find equations of the osculating circles of the ellipse 9x^2+4y^2=36 at the points (2,0)&(0,3).

*July 5, 2015*

**Math**

Find the curvature x=t^2, y=t^3 Using k=|xÿ-yx|/(x^2+y^2)^3/2

*July 5, 2015*

**Differential Equation**

Given A=2i+3j and B=4i-j Compute for the following a. |a|+|b| b. 5A-6B c. |5A-6B| d. |5A|-|6B|

*June 23, 2015*

**Math**

Alice takes 4 hours to paint a wall. With sam's help, they can paint the wall in 3 hours. Without help, how long would it take Sam to do the same thing?

*June 6, 2015*

**Trigonometry**

y = + or - 3 cos (2 theta + 3/2 pi) - 3 is my answer

*June 4, 2015*

**Trigonometry**

Write an equation of the cosine function with the given amplitude, period, phase shift, and vertical shift. amplitude = 3, period = pi, phase shift = -3/4 pi, vertical shift = -3

*June 4, 2015*

**Trigonometry**

Find tan theta if theta is an angle in standard position and the point with coordinates (â€“12, 5) lies on the terminal side of the angle.

*May 26, 2015*

**algebra**

g(x)=5, find g(-4) g(-4)=5 -4g=5 g=-1.25

*May 26, 2015*

**ALGEBRA**

Jan plans to invest $7500, part at 4% simple interest and the rest at 5% simple interest. What is the most that he can invest at 4% and still be guaranteed at least $325 per year?

*April 30, 2015*

**ALGEBRA**

Find the distance between the points (-2, 3) and (4, -5)

*April 29, 2015*

**Physics**

An equal amount of heat is transferred to two containers containing water at the same temperature. If the second container contains three times as many water molecules as the first, how do the final temperatures compare?

*April 26, 2015*

**Physics**

A liter of water is used to cool some electronics. If 1000 J of heat is given off by the electronics, by what temperature does the water increase? One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g °C). I can not get this..please help

*April 26, 2015*

**algebra**

If f(x) and g(x) are two functions defined by f(x) = ã(x + 1), g(x) = | x - 1 |, then what is the value of f(g(9))?

*April 23, 2015*

**College algebra**

. If i = ¡Ì-1, then (i + 1)(6i ¨C 10) is equivalent to?

*April 23, 2015*

**College Algebra**

The function w(x) = -0.01x² + 0.27x + 8.60 can be used to estimate the number of self-employed workers in America in millions, x years after 1980. For what years were there (or will be there) 9.7 million self-employed worker in America?

*April 23, 2015*

**math**

The area of a triangle is 600 square feet. Find the altitude, in feet, of the triangle if the length of the corresponding base is 30 feet.

*March 26, 2015*

**math(5th grade)**

1/2 x 1/4 = 1/8 are 5th grade boys

*February 26, 2015*

**Algebra 1**

Seiji and Gavin both worked hard over the summer. Together, they earned a total of $425. Gavin earned $25 more than Seiji. Hoe much did each of them earn? A. Write a system of two equations to model this program. I got 1 equation down, i just cant figure out the second

*January 23, 2015*

**Physics**

A cannon is fired at 30 degrees above the horizontal with a velocity of 200 m/s from the edge of a 125 m high cliff. Calculate where the cannonball lands on the level plain below.

*January 18, 2015*

**Physics**

A 3kw engine operates for 3secs, 10kgf force is applied find the Displacement.

*January 14, 2015*

**Physics**

Converging lens has focal lenght 8 cm , at what distance you will have to place the object in the following devices; 1) Collimator of Spectrum 2) Terrestrial Telescope

*January 14, 2015*

**Physics**

A mass of 0.55 kg attached to a vertical spring stretches the spring 36 cm from its original equilibrium position. The acceleration of gravity is 9.81 m/s2 . What is the spring constant? Answer in units of N/m.

*January 12, 2015*

**Chemistry**

Is the boiling point of 0.01 m potassium fluoride solution higher or lower than that of 0.01 m glucose solution? Explain

*December 8, 2014*

**computer science**

The components of a traditional analysis model (data flow diagrams, process definitions, entity-relationship diagrams, and data definitions) were developed in the 1970s and 1980s as part of the traditional structured analysis methodology. How well do the components fit ...

*November 17, 2014*

**Systems Analysis**

This is the question that was asked: The components of a traditional analysis model (data flow diagrams, process definitions, entity-relationship diagrams, and data definitions) were developed in the 1970s and 1980s as part of the traditional structured analysis methodology. ...

*November 17, 2014*

**art history**

That's the answers I would agree with for your study guide. All the other answers for the choices on #7, I could disprove, but I could find nothing to prove this one correct.

*November 17, 2014*

**art history**

1. Yes, but could find no resources to confirm for you. 2. No, and there's a resource that helps describe it... 3. Yes, this was a no-brainer for me. However, I found no specific resource to back it up. I would go with this answer if it were me. 4. No, and there's a ...

*November 17, 2014*

**statistics**

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...

*November 16, 2014*

**physics**

That didn't answer the question

*November 7, 2014*

**physics**

A cannon fires a 0.598 kg shell with initial velocity 10 m/s in the direction 46◦ above the horizontal. The shell’s trajectory curves downward be- cause of gravity, so at the time t = 0.53 s the shell is below the straight line by some verti- cal distance ∆h. ...

*November 7, 2014*

**Math: Statistics**

12

*October 28, 2014*

**physics**

A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the 1.0-kg cart with a constant 2.5-N force for 0.15m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart. By what amount does your force change ...

*October 23, 2014*

**science-chemistry**

An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...

*October 20, 2014*

**Chemistry**

An aqueous solution of ammonium nitrite decomposes when heated to give off nitrogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was collected over water at 25˚C ...

*October 20, 2014*

**chemistry**

Can someone help me with Chemistry Homework Due Tomorrow, Its about the Electrolysis of Hydrochloric Acid Practical we did and I Have to write a summary and I don't get what we did Y10 GCSE Higher Tier

*October 20, 2014*

**Chemistry**

The speed of light in a vacuum is 2.998 x 10^8 m/s. What is the speed of light in miles per hour? (1 km = 06214 miles)

*October 14, 2014*

**economics**

f f t t

*October 9, 2014*

**Physics**

The hare and the tortoise are at the starting line together. When the gun goes off, the hare moves off at a constant speed of 10 meters per second. (Ignore the acceleration required to get the animal to this speed.) The tortoise starts from a dead stop, but accelerates at a ...

*October 2, 2014*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 22 m/s. Ini- tially a car is 35 m behind the train, traveling in the same direction as the train at 36 m/s and accelerating at 4 m/s2. What is the speed of the car just as it passes the train? Answer...

*October 2, 2014*

**Physics**

v= 61.3m/s at max h straight line= 264.1m

*September 15, 2014*

**physics**

Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year. At this speed, how long (in years) will it take for them to drift apart by another 658.1 m?

*September 7, 2014*

**science**

from its name macro- means a large amount of substances or nutrients required for living organisms. Let me know if my answer helped you.

*September 6, 2014*

**P.E**

The answer for your question is heredity.

*September 5, 2014*

**math**

the mass of one red marble is 16g and you have 21 red marbles, therefore 16.21=336grams And you have 18 blue marbles and the mass of one blue marble is 20 grams therefore, 20.18=360g 336g+360g=696grams total in the box.. I hope my answer is correct.

*September 5, 2014*

**ALGEBRA**

for your second expression, you need to find 2 numbers that if you add or subtract will give you the middle term and if you multiply them, it will give you the last term. so going back to your example, the two number that if you multiply and they will give you (-14)is -7 and +...

*September 5, 2014*

**economics**

1) Give an example that you believe demonstrates when the cost of government actions outweighs the benefits.Identify the factors that may cause the costs of government actions to outweigh the benefits. I'm confused what does that mean? Thank you for your help!

*July 23, 2014*

**algebra**

The ratio of the lengths of strings that play the notes D and B (on a guitar), is 27 to 16. If a string 64 cm long plays B, what is the length of the string that plays a D?

*June 12, 2014*

**math**

The manager of a tea shop mixes two types of teas to make a specialty blend. Alone, the teas sell for $3.99 and $8.99 per ounce. How many ounces of each type of tea should be used to make 32 ounces of a mixture that sells for $5.99 per ounce?

*May 28, 2014*

**physics**

A steel (\alpha = 12 x 10^{-6} ^o C^{-1}) container with a volume of 548 {cm}^3 is filled with oil (\beta = 0.7 x 10^{-3} ^oC^{-1}). If the temperature is increased by 10^oC how much oil overflows? V_{spillage} =

*April 28, 2014*

**physics**

What is the total internal kinetic energy of 16.2 moles of a monatomic ideal gas at a temperature of 279 K? KE =

*April 28, 2014*

**physics**

A sound wave has a frequency of 1640 Hz. The air temperature is 46 degress F. What is the speed? v = What is the wavelenght of the sound? lambda =

*April 21, 2014*

**physics**

Water is in the big beaker in the figure on the left. Scale 1 reads 87 Newtons, scale 2 reads 544 newtons, and scale 3 reads 0 newtons. The hanging block has a density of 15 x 10^3 kg/m^3. What does scale 1 read after the block is fully lowered into the beaker of water? Scale...

*April 7, 2014*