Tuesday

March 3, 2015

March 3, 2015

Total # Posts: 1,102

**gen chem**

What is the ph of a soulution made by adding 0.20 mole NH3(aq) to 0.30 mole NH4Cl and 0.10 mole KOH to 100ml of water? Kb for NH3 (aq)=1.8x10^-5M
*March 1, 2015*

**math**

The accompanying tree diagram represents a two-stage experiment. (Let x = 0.3, y = 0.7, r = 0.55, s = 0.45, t = 0.55, and w = 0.45.) (a) Find P(A) · P(D | A). Correct: Your answer is correct. (b) Find P(B) · P(D | B). Incorrect: Your answer is incorrect. (c) Find...
*February 24, 2015*

**English**

Is This Parallel? Either you can eat or talk, but you can't do both at the same time.
*February 24, 2015*

**Math**

42x1/3=14 each girl received twice as many tickets or (2x) 14 girls(2x)=840 28x=840 x=30 per girl 15 per boy
*February 19, 2015*

**Math**

john and Julia are playing a game of darts. For each round, eqch of them throws exactly one dart and receives the number of points indicated in region of dartboard where the dart lands. Just after the first round , the dartboard looks like the diagram above. The players are ...
*February 12, 2015*

**Physics-Electricity**

A toaster consists of 4 heating elements that are connected in parallel. The toaster is connected to a 240 V mains supply. When the toaster is switched on, a current of 2.5 A is drawn from the mains supply. Calculate the electrical energy used by a single heating element in ...
*February 11, 2015*

**Programming **

The following is the Ticket for ABOOD Bus service Passenger’s Names: Going to: Date of issue: Report time: Seat no: Fare: Date of travel: Departure time: Bus no: Write a program to generate tickets for 30 passengers and save these tickets in an output document file Hints...
*February 3, 2015*

**Thermodynamics**

thanks i got it in the end
*February 1, 2015*

**Thermodynamics**

what is Tinitial for which?
*February 1, 2015*

**Thermodynamics**

A 196-g aluminum calorimeter contains 530 g of water at 19.8° C. Aluminum shot with a mass equal to 273 g is heated to 100.0° C and is then placed in the calorimeter. Find the final temperature of the system, assuming that there is no heat transfer to the surroundings.
*February 1, 2015*

**Algebra Rearrangement**

Ah ok thank you :)
*January 24, 2015*

**Algebra Rearrangement**

Please rearrange h=rx^2-tx to make x the subject.
*January 24, 2015*

**Math**

Adrian jogs 3/4 mile each morning how many days will it take him to jog 3 miles what do you do
*January 20, 2015*

**Chemistry**

A solution contains 23.1 ppm of dissolved Fe(NO3)3 (241.860g/mol), which dissociates completely into Fe3+ and NO3- (62.005g/mol) ions. Find the concentration of NO3- in parts per million
*January 9, 2015*

**Chemistry**

What is the equilibrium molarity of chloride if 19.6g of CaCl2 (110.984g/mol) is dissolved in water and diluted to 0.500L?
*January 9, 2015*

**math**

Emily spent 1/2 of her money at the store. Then she spent 1/2 of what was left at the bakery. next she spent 1/2 of what was left at the music store. She spent the remaining$6.00 at school. How much money did Emily start with?
*December 9, 2014*

**trigonometry**

At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum. a. Write x as a function of (theta). b. At what angle does the parent ...
*December 7, 2014*

**physics**

Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is about f = 4.55 x 1012 Hz, and the amplitude is about 2.69 x 10-11 m. For a typical atom, what is its (a) maximum speed and (b) maximum acceleration?
*November 30, 2014*

**Physics**

A 2.00kg solid sphere of radius 5.00cm rolls down a 20 degrees inclined plane starting from rest. (a) What is the magnitude of the acceleration of the center of mass of the sphere? (b) How far down the plane does it roll without slipping in 1.00s?
*November 29, 2014*

**Math**

A bag contains 10 white balls and 6 yellow balls. We need to add 112 balls to the bag and keep the ratio the same. How many of each do we need to add. - What's the correct formula to use?
*November 25, 2014*

**physics**

In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70kg steps on the end of a 50cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?
*November 23, 2014*

**Calculus Help**

Ha.. I was just using a old fashion calculator and hoping I could do the rest in my head. But thanks I think I understand now. =D
*November 16, 2014*

**Calculus Help**

If f(x) = sin(7 − 5x), find f′(π), which is the derivative at π: −0.754 −0.657 0 0.657 3.770 I chose 0.657 ... I did not really get this exact answer, its just that while I was trying to figure this out my answer was actually 0.6978 but I just...
*November 16, 2014*

**Economics**

If stores are charging the same prices for their merchandise, what techniques might each one adopt to differentiate its products and services from the others? What kind of competition does this illustrate?
*October 30, 2014*

**math**

After the thousandth visitor, the rooms that the light switches are still on are the ones that the numbers are a perfect square. For example, room number 4, 9, 16, 25, and 36 will all be on.
*October 20, 2014*

**AP Chemistry**

Which of the following sets of quantum numbers are allowed for an electron in a hydrogen atom? a)n=3, l=0, ml=0 b)n=4,l=1,ml=-1 c)n=2,l=1,ml=-2
*October 19, 2014*

**Chemistry**

7. The specific heat of wood is 2.03 J/g∙°C. How much heat is needed to convert 550. g of wood at -15.0°C to 10.0°C?
*October 18, 2014*

**Chemistry**

Calculate the number of moles in 8.50x1015 atoms of 4He.
*October 1, 2014*

**Algebra 2**

Thanks I hope it's right
*September 24, 2014*

**Algebra 2**

Without graphing, identify the verx, axis of symmetry, and transformations from the parent function f(x)= absolute value of x y= 4- absolute value of x-2
*September 24, 2014*

**Calculus**

A sinusoidal section is to be built as part of a roller coaster track. The high point is h=27 m at a horizontal distance d=0 m. It has a low point at h=-3 m at d=50 m. a. Write an equation expressing h in terms of d. b. The lengths of the horizontal timbers used to build the ...
*September 23, 2014*

**Calculus**

Scorpion Gulch and Western Railway are preparing to build a new line through Rolling Mountains. They have hired you to do some calculations for tunnels and bridges needed on the line. You set up a Cartesian coordinate system with its origin at the entrance to the tunnel ...
*September 23, 2014*

**Calculus**

A spacecraft is in an elliptical orbit around the earth. At the time t=0 hours, it is at its apogee (highest point), d=1000 km above the earth's surface. It is at its perigee (lowest point) d=100 km above the surface 50 minutes later. a. Assuming that d varies sinusoidally...
*September 23, 2014*

**Calculus**

At a certain point on the beach, a post sticks out of the sand, its top being 76 cm above the beach. The depth of the water at the post varies sinusoidally with time due to the motion of the tides. The depth d is modeled by the equation d=40+60cos(pi/6(t-2)) where t is the ...
*September 22, 2014*

**Algebra**

Given a point (-2,5determine a point that satisfies the specified symmetry. 1. Origin 2. y-axis 3. x-axis 4. y=x
*September 22, 2014*

**c**

Lets think of the situation. It doesn't tell you how big the pool but you can make up a value. To make it easier use a number that it a multiple of both 4 and 9. In this case it would be 36. Okay say the pools need 36 gallons of water to be full. To find the rate for each ...
*September 16, 2014*

**Physics **

A light bulb is placed 21.7 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 4.60 cm closer to the mirror. Calculate the focal length of the concave mirror.
*September 11, 2014*

**spanish please check!**

Form complete sentences using the information provided. Use the preterite tense of the verb. 1. ir / al / semana / pasada / yo / dentista / la ______________________________________________________________ 2. parque / Pablo / y / correr / perro / su / por / el ...
*August 25, 2014*

**spanish please check!**

Yo fue al dentista la semana pasada Pablo corrio el perro y su por parque ellos leyo periodicos tres cada dia Dona Rita supo la historia de nunca la verdad
*August 25, 2014*

**Spanish**

complete sentences using the information provided. Use the preterite tense of the verb. 1. ir / al / semana / pasada / yo / dentista / la 2. parque / Pablo / y / correr / perro / su / por / el día / leer / ellos / periódicos / tres / cada 4. nunca / la historia...
*August 25, 2014*

**Algebra**

If p(x) is a polynomial and is divided by (x-k) and a remainder is obtained, then that remainder is p(k). If the quadratic p(x)=x^2-3x+5 gives the same remainder when divided by x+k as it does when divided by x-3k find the value of k, k is not equal to 0. This is the answer ...
*August 2, 2014*

**Logarithms**

Ah I get it now thank you! :)
*August 1, 2014*

**Logarithms**

How is log(a/bc) the same as log(a) - log(b) - log(c). Should it not be '+ log (c)'?
*August 1, 2014*

**Spanish use of Imperfect Verbs**

Sorry we are supposed to write about our vacation in an overseas country using past,present and future tenses. As long as we use the Imperfect, Preterite etc. in the right places, it's fine.
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Here's my edited version: ¡Hola mis amigos y familias, me llamo Nick y soy en Miravida Soho en Buenos Aires, la ciudad mayor de la Argentina! Yo he estado en Sudamérica con mi familia pero no he ido nunca a Argentina. Mis compañeros de viajes vieron de ...
*July 26, 2014*

**Spanish use of Imperfect Verbs**

And I would like to give you some advice as 'me gustaría os dar/daros algunos consejos'?
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Thanks for all the help! Just a quick question, would you say "But before I finish" as 'pero antes yo termino' or is there another way?
*July 26, 2014*

**Spanish use of Imperfect Verbs**

Can someone please check if I've used the Imperfect correctly? Thank You :) ¡Ola mis amigos y familias, me llamo Nick y soy en Miravida Soho en Buenos Aires, la ciudad mayor de Argentina! Mis compañeros de viajes y yo pasamos un buen rato hoy. En la mañ...
*July 26, 2014*

**Spanish**

Can someone please just proof-read this? Especially the use of the imperfect and por/para. And don't worry about punctuation :) ¡Ola mis amigos y familias, me llamo Nick y soy en el hotel primero de Buenos Aires, la ciudad mayor de Argentina! Mis compañeros de...
*July 25, 2014*

**Books**

I didn't even think that theme was a sociological one (I'm still only in high school), that theme is just something I thought up of. And yes, my teacher said we are allowed to do fictional texts. In fact, any text at a high enough reading level is appropriate. I don&#...
*July 17, 2014*

**Books**

They're actually visual texts. One is the TV series Marvel's Agents Of Shield and the other one is the movie Dawn of the Planet of the Apes. Our teacher said to have a mixture of both written and visual but I can't think of any that would include that theme.
*July 17, 2014*

**Books**

I'm doing a paper in which I have to write about 4 texts and their connection to a theme. I already have 2 and am looking for 2 more texts. My theme is "How one can never lose his roots, no matter how much influence society has on him", or something similar. ...
*July 17, 2014*

**statistics**

assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with a mean of 79 and a standard deviation of 7.1?
*July 14, 2014*

**mqr/117**

Select the x-coordinate of the vertex of the parabola defined by the function f(x)=5x^2+3x+1
*July 13, 2014*

**Spanish**

Next week I will be in Mendoza, after spending some time in Salta. There I will drink some of their famous wines and see the historical sights. Then I’ll come back home from El Plumerillo Airport! Argentina is a beautiful country, but there can be thefts and hooliganism. ...
*July 7, 2014*

**Spanish**

Sorry for the late reply. This is the stuff I want to talk about. I realize this is a lot so some bits will be cut out. I’m in Salta now on day 5 of my 11-day tour of northern Argentina. I arrived at Rio Gallegos International Airport early Monday morning and got picked ...
*July 7, 2014*

**Spanish**

Thanks but that's just what we need to include. I was wondering if someone could provide me with sentence starters in spanish because we haven't worked on this in class at all, so they would at least give me an idea as to how to write my speech
*July 7, 2014*

**Spanish**

Our spanish class has been given a 1-minute speech to write up over the holidays, but our teacher hasn't provided us with any extra material we can use. I was wondering if you could give me sentence starters etc. to help me work on it. Here is the scenario: (my chosen ...
*July 7, 2014*

**mat/117**

Select the value of x that is the solution for the equation 6/x=7/x+3
*July 6, 2014*

**math/117**

An object 5.7 feet tall casts a shadow that is 17.1 feet long. How long in feet would the shadow be for an object which is 19.5 feet tall?
*July 6, 2014*

**accounting**

The formula for computing additional paid-in capital in excess of par is shares of stock times
*June 21, 2014*

**math!!**

A 9-pack of toy cars costs $8.58. What is the unit price, rounded to the nearest cent?
*June 3, 2014*

**math**

6b/3a+b/a
*May 31, 2014*

**algebra**

A store sells mixtures of almonds and cashews for $6.50 per pound. Peanuts sell for $2.95 per pound and cashews sell for $7.95. How many pounds of each should be used to make 80 pounds of this mixture?
*May 28, 2014*

**Spanish**

Ok thank you :)
*May 23, 2014*

**Spanish**

First of all, thanks so much for all your tips :). Secondly, it's not an essay, it's an oral exam whereby we speak to our partners without any cues or notes. Our teacher told us to revise the preterite, though I don't quite understand the differences between this ...
*May 23, 2014*

**Spanish**

Hi, yes I knew about the accent marks and punctuation, I just didn't have the time to put them in. Sorry, I should have pointed that out earlier. Also, we are supposed to include some small talk, so I was thinking we could talk about the weekend by asking something like &#...
*May 23, 2014*

**Spanish**

Sorry I just realized it's a bit hard to see who's talking.
*May 23, 2014*

**Spanish**

This is my piece that I've been working on with my classmate. It's not finished though, but this will not be the exact conversation we'll be having. The actual assessment is an impromptu style conversation. Hola! Que pasa? Bien. Y tu? Como estas? Bien, bien, muy ...
*May 23, 2014*

**Spanish**

Hi, I would like some tips on what to say when you're talking to a friend about what you're packing & need to buy to go on a trip. This is a conversational piece where it is required that we speak out of context as well (talking about the weekend, activities planned in...
*May 23, 2014*

**Global History**

If you google "Mrs. Sita’s Global Review Packet" it should be the 1st link which is a .pdf. The first page asks about the Neolithic Revolution and Ancient Civilizations.
*May 4, 2014*

**Global History**

No, it doesn't let me post links. Here. Remove the parenthesis from this link: johnbowne(((.)))org/ourpages/auto/2011/1/31/49875088/Global_Regents_Review_Pack__blank_(((.)))pdf
*May 4, 2014*

**Global History**

Replace where it says " DOT " with a period "."
*May 4, 2014*

**Global History**

I need answers to the questions in the link above.
*May 4, 2014*

**Global History**

Yes! I have my facts right! Can you help me find answers then?
*May 4, 2014*

**Global History**

Ms. Sue, this is a website dedicated to helping people cheat on their homework. I know my stuff, but this is too long to get finished in such a short time. I need an answer key.
*May 4, 2014*

**Global History**

Ms. Sue, It's not a test, it's a review packet that was assigned for homework.
*May 4, 2014*

**Global History**

I need answers for "GLOBAL HISTORY REGENTS REVIEW" packet. Associated names are Mr. Moeller and Mrs. Sita. I can't find answers anywhere. The packet can be found blank online here: johnbowne DOT org/ourpages/auto/2011/1/31/49875088/...
*May 4, 2014*

**history**

i need to build a visual for civil war prisoner of war
*May 1, 2014*

**Geometry**

hey im in connections? did u get help im stuck on it
*May 1, 2014*

**NATURE OF ELECTRICITY**

If a charged sphere is brought close to a rod as shown in Figure A, the pairs of pith balls suspended at the ends of the rod will as the figure im reading is showing there is a charged sphere to the left then a induced charged on the rob which the pith balls are hanging from A...
*April 24, 2014*

**Math**

An electronics store usually sells 18 remote control devices per week at a retail price of $12.49. This week the manager put the remotes on sale for a markdown of 20%, and sold 25 of them. How much more revenue was earned this week by having the sale?
*April 23, 2014*

**math!!**

Roy Landers bought 3,000 shares of stock for $59 per share. Six months later he sold the 3,000 shares of stock for $75 per share. If the stockbroker's commission was $975, how much profit did Roy make on the transaction?
*April 23, 2014*

**math**

brain cut an extra large round pizza into 12 pieceas .Seven of then were eaten. WQhay angle measure of pizza is left
*April 22, 2014*

**Math**

Suppose that è is an angle in standard position whose terminal side intersects the unit circle at ((-15/13),(12/13)). Find the exact values of cscè, tanè, and sinè.
*April 17, 2014*

**Math**

The yearly returns of a stock are normally distributed with a mean of 5.1% and standard deviation of 2.7%. Find the probability of a yearly return being greater than 6%.
*April 15, 2014*

**chemistry**

Thank you :)
*April 12, 2014*

**chemistry**

1. Calculate pH of an acetate buffer containing 27.5 mM acetic acid (pKa is 4.74) and 50 mM sodium acetate. When a 30 mM aq solution of sodium acetate was prepared in the lab it had a pH of 8.8. Calculate the amount of acetic acid (in g) to be added to 0.5 L of this sodium ...
*April 12, 2014*

**Math**

5x^4-41x^3-87x^2-31x+10=0
*April 10, 2014*

**physic**

how many kcal of heat must be withdrawn from 4.56 kg of steam at 125 degrees C to change it to ice at -44.5 degrees C???
*April 9, 2014*

**physics**

how many Btu of heat are required to melt 8.35 lb of ice at 32 degrees F
*April 9, 2014*

**Need help on Physics!!**

Three uniform spheres are fixed at the positions shown in the diagram. Assume they are completely isolated and there are no other masses nearby. (a) What is the magnitude of the force on a 0.20 kg particle placed at the origin (Point P)? What is the direction of this force? (b...
*March 31, 2014*

**Please help me!!!!!**

Some fishing line is made out of nylon with Y =3.0!109Pa and breaking stress 7.7!107 Pa . It is 5.0 m long, you are holding one end, and it hangs down vertically. (a) When a 3.0-kg fish is attached to the bottom end, the fishing line elongates by 1.0 cm. What is its cross ...
*March 31, 2014*

**Another Physics**

At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).
*March 28, 2014*

**physics**

At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).
*March 27, 2014*

**physics**

A typical volume of a modern hot air balloon is 2500 cubic metres, and a typical maximum temperature of the hot air is 120 degrees Celsius. Given these figures, and an outside air temperature and density of 15 \(^{\circ}C\) and 1.225 \(kg/m^3\) respectively, compute the ...
*March 27, 2014*

**physics**

Suppose that, on a day when the outside temperature is 15 degrees Celsius, we fill a balloon with pure nitrogen gas, of which the molar mass is 28 grams per mole. Now suppose that we want to heat up a second (equally large) balloon containing air, such that it generates the ...
*March 27, 2014*

**physics**

Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day when the sea level ...
*March 27, 2014*

**physics**

Thank you steve , please how do you know that each ballon occupies .01617m^3, please if possible give more precisions. I find 0,002746744 which doesn´t make sens to me. How do I make it ? thanks
*March 26, 2014*

**physics**

Thank you steve , please how do you know that each ballon occupies .01617m^3, please if possible give more precisions.
*March 26, 2014*

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