Sunday

February 1, 2015

February 1, 2015

Total # Posts: 6,442

**pre-calc helpppp**

Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. ã((1-cos50)/2)
*April 21, 2012*

**pre-calc helpppp**

Thank you!!!!
*April 21, 2012*

**pre-calc helpppp**

Evaluate the expression under the given conditions (show steps please) sin(è/2); tan è = − 5 / 12 , è in Quadrant IV
*April 21, 2012*

**Chemistry!! Help**

Consider the following equilibrium: N2O4 <=> 2NO2 You may assume that delta H and delta S do not vary with temperature. At what temperature will an equilibrium mixture of 1 atm total pressure contain twice as much NO2 as N2O4?
*April 20, 2012*

**Chemistry!!!**

Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction
*April 20, 2012*

**MATH##$$&&^^****

4.16%
*April 20, 2012*

**Physics**

Thanks Elena your a life saver :)
*April 20, 2012*

**Physics**

A cube of ice is taken from the freezer at -8.8°C and placed in a 103 g aluminum calorimeter filled with 321 g of water at room temperature of 20°C. The final situation is observed to be all water at 15°C. What was the mass of the ice cube? Could someone please ...
*April 20, 2012*

**math**

6/8
*April 19, 2012*

**math**

The water in fish tank has evaporated so it was 5/8 inch below the level it should be they added water and the water level went up 3/4 inch did the water level end up above or below where it should be
*April 19, 2012*

**science**

Which of the following scales use the concept of absolute zero? I. C II. F III. K IV. R
*April 18, 2012*

**science**

Thermal energy is different from temperature because thermal energy depends on the _____.
*April 18, 2012*

**science**

A trash can is rolling down the street at 5 m/s. If the trash can has a mass of 23 kg, what is its momentum?
*April 18, 2012*

**chem**

Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
*April 18, 2012*

**science**

Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
*April 18, 2012*

**english**

thank you and for this one: Meredith is to be restored as captain.the infinitive is to be and is a noun?
*April 17, 2012*

**english**

so it is to use and it would be a adverb
*April 17, 2012*

**english**

okay and the second one is i have permission and its a adverb?
*April 17, 2012*

**english**

okay and the answer can only be a noun.adverb or adjective.
*April 17, 2012*

**english**

i have one more question what is the function of the italicized infinitive phrase ins the sentence. 1.I want to go with you to the store. 2.May I have permission to use the car tonight?
*April 17, 2012*

**english**

thank you ms.sue
*April 17, 2012*

**english**

what is the gerund phrase and the noun function of the gerund in the sentence 1.Her favorite pastime is entertaining friends.
*April 17, 2012*

**Math**

A math teacher is randomly distributing 15 rulers with centimeter labels and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels.
*April 16, 2012*

**physics- help please !!1**

A toy rocket moving vertically upward passes by a 2.2m -high window whose sill is 7.0m above the ground. The rocket takes 0.17s to travel the 2.2m height of the window part a) what was the launch speed of the rocker ? assume the propellant is burned very quickly at blastoff ...
*April 16, 2012*

**physics**

15.5
*April 15, 2012*

**Chemistry 1201**

Thanks so much!
*April 15, 2012*

**Chemistry 1201**

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
*April 15, 2012*

**Chemistry 1201**

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
*April 15, 2012*

**Chemistry 1201**

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium carbonate needed to produce 53 L of carbon dioxide at STP?
*April 15, 2012*

**Pre-Calc Help!!!!!!!!!!!!!!!!1**

can someone help me please????
*April 15, 2012*

**Calc Help!!!!!!!!!!!!!!!!1**

tan(sin^-1(5/6)-cos^-1(1/5)
*April 15, 2012*

**Math**

Try 868
*April 15, 2012*

**physics**

An athlete thtrew a short put of mass7.52kg through a distance of 24m when we projected a short put at angle of 30. Assuming there is no air resistance, what is the initial kinetic energy of the athlete.
*April 15, 2012*

**psyc355**

30.9
*April 15, 2012*

**psyc355**

Children below the 30th percentile (in the bottom 30%) are in need of special assistance prior to attending school. What raw score marks the cut-off score for these children?
*April 15, 2012*

**Chemistry!!!**

What is the solubility of MnS, in grams per liter, in a buffer solution that is 0.120 M HC2H3O2 - 0.490 M NaC2H3O2? For MnS, Kspa=3x10^7.
*April 13, 2012*

**Chemistry!!**

A solution has [Al^3+]=8.0×10−2 M and [HC2H3O2]= 1.10 M. What is the maximum quantity of NaHC2H3O2 that can be added to 200.0 mL of this solution before precipitation of Al(OH)3 begins?
*April 13, 2012*

**Accounting**

At the beginning of April, Owl Corporation has a balance of $12,000 in the Retained Earnings account. During the month of April, Owl had the following external transactions. 1. Issue common stock for cash, $10,000. 2. Provide services to customers on account, $7,500. 3. ...
*April 13, 2012*

**physics**

Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.
*April 13, 2012*

**Physics**

a.) P=P initial + pgh 101,000 Pa + (1000)(9.8)(2.5) P=125500Pa. P=F/A 125500=F/50 6.3*10^6N
*April 13, 2012*

**Chem...**

1) what is the density of methane (CH4) at a temp. of 20C and a pressure of 684mm. 2) a gas has a density of 2.5g/L at a temp. of 20C and a pressure of 1.1 atm. what is its molar mass.
*April 12, 2012*

**Math**

As a fraction it is 60/100 but you probably need to simplify it so find a common factor of both, in this case the number 20, and divide both 60 and 100 by that to get the fraction of 3/5. 60% is equal to .6 because 100% equals 1.
*April 12, 2012*

**Physics**

The formula to use is c=f*lambda where c equals speed of a wave, f is frequency, and lambda is the Greek for wavelength. So to find the speed you multiply 9 by .654 and the answer should be 5.886 m/s.
*April 12, 2012*

**math**

I believe to find the sum of the exterior angles of a n-sided polygon is (n-2)*180 where n is the number of sides. So for a 50-sided polygon it should be 8640 degrees. For the interior angles it is (n-2)*180/n where again n is the number of sides.
*April 12, 2012*

**Math**

For a line to be perpendicular to another line you need to use m in the linear equation of y=mx+b and find the opposite and reciprocal of that number. In this case m is 3 so the opposite of 3 is -3 and the reciprocal is just flipping the fraction of -3/1 so it is now 1/-3. Now...
*April 12, 2012*

**Physics**

Where must an object be placed to have a magniﬁcation of 3.74 in front of a converging lens of focal length 14.1 cm? Answer in units of cm
*April 12, 2012*

**Science**

D because mechanical energy is basically kinetic energy and when that is greater than the force of gravity then it will not fall down.
*April 12, 2012*

**Physics**

Three identical small Styrofoam balls of mass 1.53 g are suspended from a ﬁxed point by three nonconducting threads, each with a length of 56.4 cm and negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 31 cm. What is the common ...
*April 12, 2012*

**algebra**

For the area of a circle is πr² as you stated so all you do is set 400 equal to πr² and solve for r. 400=πr²/π 127.32=r² √127.32)= r r=11.3 Same thing for this except you use 800 instead of 400 so. 800=πr² 254.64=r²...
*April 12, 2012*

**math**

You have 7 red marbles and 5 green marbles in a bag. You select one, do not replace it then select another. Find P(red,red) and P (green,green). Write probabilites as a percent and rounded to the nearest whole percent. Find P(red,green) and P (green,red). Compare.
*April 12, 2012*

**Physics**

Three identical small Styrofoam balls of mass 1.53 g are suspended from a ﬁxed point by three nonconducting threads, each with a length of 56.4 cm and negligible mass. At equilibrium the three balls form an equilateral triangle with sides of 31 cm. What is the common ...
*April 11, 2012*

**Chemistry**

What 3 compunds can be used to prepare oxygen in the laboratory? What are the reactions for each of the three compounds?
*April 10, 2012*

**College Algebra**

Annual profit in thousands of dollars is given by the function, P(x) = -.1x^2 + 50x - 300, where x is the number of items sold , x >= 0. 1.describe the meaning of the number -.1 in the formula. 2.describe the meaning of the number -300 in the formula. 3.find the profit for ...
*April 9, 2012*

**physics**

A down jacket has a surface area of 0.82 m2 and is filled with a 3.8 cm thick layer of down, which has a thermal conductivity of 6.0 10-6 kcal/(s · m · C°). The coat is worn by a person whose skin temperature is maintained at 27° C. The outer surface of ...
*April 9, 2012*

**physics**

The sun is 1.5 1011 m from the earth. (a) Over what surface area is solar radiation spread at this distance? (b) What is the total power radiated by the sun? (The sun delivers energy to the surface of the earth at a rate of approximately 1400 W/m2.) (c) Treating the sun as a ...
*April 9, 2012*

**physics**

A pot containing 1.09 liter of water, initially at 18°C, is placed on a 1101 W electric heating element. (a) How much heat must be supplied to the water to bring it to a boil? (b) How much heat is necessary to boil all the water away? What is the minimum time required to ...
*April 9, 2012*

**Financial Math**

Suppose that you decide to lease a car. At the end of the 48-month lease period, you need to make a lump-sum payment of $5000 if you want to keep the car. You decide to save up, just in case you decide to keep the car; if you don’t keep this car, you will still have saved...
*April 9, 2012*

**physics**

A 55.0 g ice cube, initially at 0°C, is dropped into a Styrofoam cup containing 318 g of water, initially at 18.2°C. What is the final temperature of the water, if no heat is transferred to the Styrofoam or the surroundings?
*April 9, 2012*

**physics**

How much energy expressed in units of food Calories (that is, kilocalories) is required to operate a 100 W light bulb for 14.70 hours?
*April 9, 2012*

**physics**

(a) How much heat is required to raise by 12.40°C the temperature of 1.4 kg of water. (b) How much heat is required to raise by 12.40°C the temperature of 1.4 kg of iron.
*April 9, 2012*

**math**

marcie, kim and yvonne are on the same softball team. (A). During the last season . Marcie hit 3 less than twice the number of home runs that kim hit let h represent the number of home runs that kim hit . write an expression that represents the number of home runs that Marcie ...
*April 8, 2012*

**english**

1. apa 2. mla 3. apa 4. mla 5. mla 6. apa 7. apa 8. mla 9. both 10. apa are these right answers
*April 8, 2012*

**english**

Choose and Place MLA, APA, or Both in the blank. _____1. In a work with a single author, the author’s last name and initials are listed in the works cited entries. _____2. In a work with a single author, the author’s full last name and first name are listed in the ...
*April 8, 2012*

**chemistry**

@Amanda, k
*April 7, 2012*

**Statistics**

Should companies use the same confidence interval each time a confidence interval is determined or should the level change based on situations? If it changes based on situations, what type of situations might call for higher confidence levels?
*April 6, 2012*

**Chemistry :((((**

Thank you so much!!! :)))))
*April 6, 2012*

**Chemistry :((((**

explain why the bond angles found for the molecules below is as given below. Methane 109.5 Ammonia 107.5 water 104.5
*April 6, 2012*

**english**

hello?
*April 5, 2012*

**english**

alright but what structure would it be?
*April 5, 2012*

**english**

i don't know
*April 5, 2012*

**english**

i just need help on it
*April 5, 2012*

**english**

well i know its not a infinitive phase
*April 5, 2012*

**english**

its asking what grammatical structure is italicized in the sentence
*April 5, 2012*

**english**

What grammatical structure is the italicized portion of the sentence? Although her personality had not changed at all, Megan looked quite different is it: adverb clause infinitive phrase past participial phrase elliptical clause adjective clause
*April 5, 2012*

**Chemistry**

During the synthesis of Ferrocene, deprotonation of cyclopentadiene is carried out using 1,2-dimethoxyethane (DME). If the deprotonation is carried out using MeOH, will the reaction be faster or slower? Why?
*April 5, 2012*

**Physics grade 12**

A horizontal beam of alpha particles are injected with a speed of 1.3x10^5 m/s into a region with a vertical magnetic field of magnitude 0.155T. A- How long does it take for an alpha particle to move half way through a complete circle? B- If the speed of the alpha particle is ...
*April 5, 2012*

**Economics**

How might expectations of a fiscal policy being temporary weaken the effects of the policy?
*April 4, 2012*

**Economics**

How could “politics” complicate fiscal policy?
*April 4, 2012*

**Economics**

Can you please explain the problem of time lags in enacting and applying fiscal policy?
*April 4, 2012*

**computer science**

Prove that the following language is not context free: L = {a^3^n : n >= 0}
*April 4, 2012*

**Essessentials of Communication(Speech)**

I've been stuck on this question for the longest and can't find help anywhere. Instructions Read the following statement; then respond with a question, content paraphrase, feeling paraphrase, and a combination of content and feeling paraphrase. Statement from Speaker...
*April 4, 2012*

**Government**

In which type of colony did strict governors anger the colonists? A. the royal colonies B. the proprietary colonies C. the charter colonies D. the informed colonies
*April 3, 2012*

**discrete mathematics**

prove the euclid division given and int j and k>0 then one can find a unique pair (q,r) of int state j=q*k +r and 0<r<k
*April 3, 2012*

**MATH**

tree diagra probability: tree diagram with three equal parts, what is the probability, if we spin twice of getting at least one a
*April 1, 2012*

**math**

In an experiment, Marissa must select a letter card below and spin the spinner once. A B C D 1 2 3 What is the probability that Marissa's outcome will be the letter card A and the number 3 on the spinner?
*April 1, 2012*

**Mechanics (A level), Please help**

A light string of length a is attached to two points A and B on the same level and distance b apart, where b < a. A smooth ring of weight W is threaded on the string and is pulled by a horizontal force P, so that it rests in equilbrium vertically below B. Show that tension ...
*April 1, 2012*

**Pre-Calc Helppp!!!**

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that B1 is smaller than B2.) a = 39, c = 40, angle A = 36° angle B1...
*March 31, 2012*

**Math**

Find the Dimensions of a rectangular garden of the greatest area that can be enclosed in 40 feet of fencing.
*March 31, 2012*

**Chemistry**

Consider the cracking of gaseous ammonia at constant total pressure of 1 atm and constant temperature. Find the equilibrium gas composition at 400 degree C. Given: The Gibbs free energy for the cracking reaction 2NH3 = N2 + 3H2, DeltaGo ( delta G standard) =87,030-25.8TlnT &#...
*March 29, 2012*

**Chemistry**

Calculate the partial pressure of monatomic hydrogen in hydrogen gas at 2000 K and 1 atm pressure. Given: (i) For ½ H2 -> H, DeltaHo298=217,990 J; DeltaSo298=49.35 J/K. (ii) Assume that the heat capacity of monatomic gas to be 3/2R (iii)The heat capacity of H2 assume...
*March 29, 2012*

**Economics**

How does government intervene to move an economy out of a recession?
*March 28, 2012*

**Economics**

What does the term “recession” mean and how do we know when one occurs?
*March 28, 2012*

**Economics**

What is “Gross Domestic Product” (G.D.P.)
*March 28, 2012*

**Economics**

How might earning a college degree increase lifetime earnings and employability?
*March 28, 2012*

**Economics**

Why might an increase of the minimum wage in the United States impact unemployment rates?
*March 28, 2012*

**physics**

A sharp image is located 83.0 mm behind a 62.0 mm focal-length converging lens. Find the object distance by calculation.
*March 28, 2012*

**probability**

tommy has 7 yellows 6 green 3 blues 8 red wht it tommy probability that she will not draw a green ball
*March 27, 2012*

**Astro**

Suppose you lived on a planet with the same radius as the Earth, but it had a density 2.99 times Earth's density. Your weight would be different on this planet. Find how much you would weigh on this planet divided by your weight on Earth
*March 27, 2012*

**Physics help please!!!**

so is part a .162m
*March 27, 2012*

**Physics help please!!!**

A 2.10 kg frictionless block is attached to an ideal spring with force constant 315N/m . Initially the block has velocity -3.75m/s and displacement 0.270m . Find (a) the amplitude of the motion. (b) the maximum acceleration of the block. (c) the maximum force the spring exerts...
*March 27, 2012*

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