Friday

February 27, 2015

February 27, 2015

Total # Posts: 6,504

**chemistry**

75g of FeCL3 are dissolved in 700 mL of solution, what is the concentration of Fe3+ ions? what is the concentration of Cl- ions?
*November 25, 2012*

**physics**

A duck has a mass of 2.70 kg. As the duck paddles, a force of 0.130 N acts on it in a direction due east. In addition, the current of the water exerts a force of 0.210 N in a direction of 52.0 ° south of east. When these forces begin to act, the velocity of the duck is 0....
*November 25, 2012*

**physics**

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.46 x 105 m/s to a final velocity of 2.25 x 106 m/s while traveling a distance of 0.0803 m. The ...
*November 25, 2012*

**physics**

An airplane has a mass of 3.41 × 104 kg and takes off under the influence of a constant net force of 2.57 × 104 N. What is the net force that acts on the plane's 78.8-kg pilot?
*November 25, 2012*

**English and grammar**

i need someone to check my work but i cant just copy it and paste it here. i need to send it via e-mail. please give me your email add and ill send it to you. thanks
*November 25, 2012*

**alebra**

9,040,000,000
*November 24, 2012*

**maths**

differentiate x^2ex^2 W.R TO X
*November 24, 2012*

**English and Grammar**

I choose to do research on Avoidant personality disorder or APD because a friend of is suffering from APD and I’m having trouble how to approach him. My friend’s name is Jim. He told me that he started to feel the symptoms when he was in his teen age years. Jim told ...
*November 23, 2012*

**English and Grammar**

first draft of my report and i need help in improving this. i didnt made up all the information here all comes from a book. Dissociative identity disorder is defined in the DSM-IV-TR as the presence of two or more personality identities that repeatedly take control of one’...
*November 23, 2012*

**Algebra II**

so x would = 3?
*November 20, 2012*

**Algebra II**

Find the x-value at which y=2x+5/x-3 is undefined.
*November 20, 2012*

**Algebra II - Word Problem**

A convenience store clerk can wait on 6 customers per minute. If customers arrive at an average rate of x people per minute, the time T spent in line is: T=1/6-x, where 0<x<6 Find the waiting time if an average of 4.75 people arrive each minute.
*November 20, 2012*

**math**

those are 0 in the question not θ
*November 20, 2012*

**math**

P: Solve each to four decimal places (x real and 0 in degrees) 5 cos x - 2 = 0, 0<orequalto x < 2pi
*November 20, 2012*

**Chemistry114**

The air in a cylinder with a piston has a volume 220 ml and pressure of 650 mm hg. If the pressure inside the cylinder increase to 1.2 atm. what is the final volume of the cylinder? Complete the following data table.
*November 19, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 18, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 18, 2012*

**Chem**

. Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. A. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3? Show your solution. B. Discuss at least three potentially ...
*November 17, 2012*

**Chemistry**

Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
*November 17, 2012*

**chemistry**

If 45 colonies grew on the filter and 1 mL of a 10-5 dilution of the sample was filtered, how many coliform bacteria were in 100 mL of the original sample?
*November 16, 2012*

**math**

9:4 dude hope i helped =]
*November 16, 2012*

**math**

Paul's Pizzeria sells 45 cheese pizzas and 20 pepperoni pizzas each week. What is the ratio of cheese pizzas to pepperoni pizzas sold each week by Paul's Pizzeria?
*November 16, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 16, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 16, 2012*

**math**

Sin(2x)=2sin(x)cos(x) find the exact value in radians with 2sin^2(x)+sin^2(x)=0, i really do not get this question or even how to do this ive been trying to figure it out but cant
*November 16, 2012*

**math**

Sin(2x)=2sin(x)cos(x) find the exact value in radians with 2sin^2(x)+sin^2(x)=0, i really do not get this question or even how to do this ive been trying to figure it out but cant
*November 16, 2012*

**physics**

When archer pulls an arrow back in his bow.He is storing potential energy in his bow What avg force must the archer exert if he pulls the string back a distance of 30 cm?
*November 15, 2012*

**english(quotes)**

The identity you stand up for can enslave you and close you to the rest of the world. -Murathan Mungan What does this quote mean?
*November 15, 2012*

**Algebra II - Word Problem**

If a car is traveling downhill at 45 miles per hour on dry pavement, then the braking distance B is B = 45/(0.4+m), where m<0 is the slope of the road. Find the slope of the road if the braking distance is 125 feet.
*November 15, 2012*

**Algebra II - Word Problem**

I'm guessing it's 48 seconds, but not sure... Thanks!
*November 15, 2012*

**Algebra II - Word Problem**

A convenience store clerk can wait on 6 customers per minute. If customers arrive at an average rate of x people per minute, the time T spent in line is T = 1/(6-x), where 0<x<6 Find the waiting time if an average of 4.75 people arrive each minute.
*November 15, 2012*

**physics**

NEVERMIND I GOT IT
*November 15, 2012*

**physics**

A body of mass m is attracted to a 11 kg mass 31.2cm away with a force magnitude of 6.42 x 10^-8 Find m? I am having trouble with the algebra getting m by it self just show me the steps if you can
*November 15, 2012*

**Chemistry**

37.5 x .152 / 25
*November 15, 2012*

**Algebra II**

A runner completes a 16 mile trip, running 8 miles uphill and 8 miles downhill in a total of 4 hours, if his uphill speed is 3 mph slower than his downhill speed, find his downhill speed.
*November 15, 2012*

**Statistics**

One event A is _________________ of another event B if the probabilty of event A has occurred given event B is the same as the probability that A will occur with no knowledge of B. disjoint mutually exclusive dependent independent
*November 15, 2012*

**Statistics**

If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
*November 15, 2012*

**math**

Yes Kate is right. ur sexy too jk
*November 14, 2012*

**Science**

Chl has an absorbance peak at 435nm (Soret band) and a peak at 665nm (Qytransition). Calculate the energy gap (in Joules) between the ground and excited states of these two transitions.
*November 14, 2012*

**Physics**

An advertising firm has contacted your engineering firm to create a new advertisement for a local ice-cream stand. The owner of this stand wants to add rotating solid cones (painted to look like ice-cream cones, of course) to catch the eye of travelers. Each cone will rotate ...
*November 13, 2012*

**Finance**

United Technology Corporation (UTC) has $40 million of convertible bonds outstanding (40,000 bonds at $1,000 par value) with a coupon rate of 11 percent. Interest rates are currently 8 percent for bond of equal risk. The bonds have 15 years left to maturity. The bonds may be ...
*November 13, 2012*

**physics**

A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless sup- porting surface. The girl begins to walk along the plank at a constant speed of 1.87 m/s to the right relative to the plank. What ...
*November 12, 2012*

**physics**

A 43.3 kg girl is standing on a 125 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless sup- porting surface. The girl begins to walk along the plank at a constant speed of 1.87 m/s to the right relative to the plank. What ...
*November 12, 2012*

**physics**

A(n) 775 N man stands in the middle of a frozen pond of radius 11.2 m. He is un- able to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.3 kg physics textbook horizontally toward the north shore, ...
*November 12, 2012*

**Statistics**

Which of the following statements about the correlation coefficient r are true? I. It is not affected by changes in the measurement units of the variables. II. It is not affected by which variable is called x and which is called y. III. It is not affected by extreme values. I ...
*November 12, 2012*

**Statistics**

Suppose a study finds that the correlation coefficient relating family income and SAT scores is r = +0.98. Which of the following are proper conclusions? I. Poverty causes low SAT scores II. Wealth causes high SAT scores III. There is a very strong association between family ...
*November 12, 2012*

**math**

Q) (Speed) Ahmed drives from Abu Dhabi to Dubai. The journey takes him 1 hour 30min and the distance covered is 130km. What is the average speed at which he was travelling (rounded to the nearest 1km/hr)?
*November 12, 2012*

**science**

What is meant by depassivation of reinforcement? State the two main chemical attacks that lead to depassivation
*November 11, 2012*

**Physics**

A file cabinet weighing 1500 N is at rest on the floor. The coefficient of static friction between the floor and the cabinet is 0.5. What is the minimum force required to make the file cabinet move horizontally
*November 10, 2012*

**science**

Abiotic factors
*November 10, 2012*

**math**

how do you go about doing place value puzzles .can you show me an example please(hundredths place,thousandths place,ones place and tenths place
*November 9, 2012*

**Math**

113.50 ? 114.50 ? 115.00
*November 8, 2012*

**physics **

A shopper in a supermarket pushes a loaded 32 kg cart with a horizontal force of 15 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 3.3 s, starting from rest? Answer in units of m
*November 8, 2012*

**Organic chemistry**

Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
*November 8, 2012*

**Chemistry**

Help me find my percent yield for my witting reaction experiment.... The weight of my final product was: 0.13 I put 0.40 g of benzyltriphenylphosphonium chloride, 0.23 g of 9-anthraldehyde and 1.0ml DMF and 0.5ml of aqueous sodium hydroxide into the flask at the start of the ...
*November 8, 2012*

**Organic Chemistry**

chlorobutane, chloride ion is weaker leaving group
*November 8, 2012*

**Statistics**

Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
*November 8, 2012*

**Statistics**

New York and Pennsylvania have progressive toll roads. Upon entering the toll road the driver receives a ticket marking the location and time of entrance. Upon exiting the mileage is computed and the driver pays the toll. Which of the following would you expect to be true ...
*November 8, 2012*

**science**

Assume an average human cell has a cell cycle of 20 hours. Calculate how many cells there would be after 80 hours.
*November 7, 2012*

**social studies**

what resources did early native american used
*November 7, 2012*

**Physics **

A freight train has a mass of 1.7 × 10^7 kg. If the locomotive can exert a constant pull of 5.2 × 10^5 N, how long would it take to increase the speed of the train from rest to 74.6 km/h? Disregard friction. Answer in units of s
*November 7, 2012*

**fractions from least to greatest**

can you list 3/4, 3/5, and 5/6 from least to greatest
*November 7, 2012*

**History,Art**

Yes I have, I need to provide information about her and her life but I need to know her name.
*November 7, 2012*

**History,Art**

I need to find a picture of 2 paintings: Crimson Rambler by Philip Hale and Automat by Edward Hopper. I also need some assistance with this assignment involving these two paintings. I have to outline a story I would write about the woman in the paintings(I'm supposed to ...
*November 7, 2012*

**Pre Calc**

How to prove tan4x = 1-8 sin squared of cos squared of x
*November 6, 2012*

**chemistry**

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0230 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation?
*November 5, 2012*

**grammar**

SSS means a compound subject and PPP means a compound predicate if i am right .(1) Blue flages and green rushes grew along the river.I underline blue flags and green rushes once,and grew along bthe river. twice.(2)I underline the flat creek bed once and was made of warm, soft ...
*November 5, 2012*

**grammar**

can you underline the complete subject and the complete predicate of these sentences.show by stating (SSS)and(PPP)also.(1)Blue flags and green rushes grew along the river.(2)The flat creek bed was made of warm ,soft mud. (3)Laura hopped and splashed in the cool creek.(4)The ...
*November 5, 2012*

**Math**

10/12=x/36 360/12=30 yds 1296 inches converted into yards is 36 yds
*November 5, 2012*

**Statistics**

A random sample of 250 men yielded 175 who said they'd ridden a motorcycle at some time in their lives, while a similar sample of 215 women yielded only 43 that had done so. Find a 99% confidence interval for the difference between the proportions of men and women who have...
*November 5, 2012*

**Statistics**

@MathGuru you're useless. You only solve the obvious and then leave us hanging.
*November 5, 2012*

**Statistics**

A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance ...
*November 5, 2012*

**biology**

In which sequence did aerobes, anaerobes, chemolithotrophs and cyanobacteria evolve? What evidence is there to support your answer. If someone can answer please. I think its talk about how cyanbactoria evolve.
*November 4, 2012*

**statistics**

A random sample of 250 men yielded 175 who said they'd ridden a motorcycle at some time in their lives, while a similar sample of 215 women yielded only 43 that had done so. Find a 99% confidence interval for the difference between the proportions of men and women who have...
*November 4, 2012*

**statistics**

A random sample of 384 people in Dalto City, a mid-sized city, revealed 112 individuals who work at more than one job. A second random sample of 432 workers from East Dettweiler, another mid-sized city, found 91 people who work at more than one job. To conduct a significance ...
*November 4, 2012*

**Maths**

Let f(x) = tan(x). What is the formula for the conditioning number of f? Evaluate this formula for x =(π/4), 1.01, 1.26, 1.51 (in radians, working to 3 signifi cant figures, the precision that is implicit in this data). Replace each of the expressions for x by its ...
*November 4, 2012*

**Physics**

Hmm this is probably wrong but I was thinking of something like this: M1 = the mass that was in one of the holes R2 = the radius of one of the holes M = mass of the whole original disk R = radius of whole original disk I think the following relation makes sense: M1(R/2)^2 = 0....
*November 2, 2012*

**Physics**

No problem. For my question, I know the goal is to basically subtract the inertia's of the 3 holes from the whole disk's inertia, 0.5*MR^2, but I think what I'm stuck on is how to find that value, or relate it to what we know. The final inertia needs to be 0.81(0.5...
*November 2, 2012*

**Physics**

To reduce its rotational inertia, an engineer proposes drilling three holes in a large wheel of radius R. The holes are to be centered midway between the center and edge of the wheel. What should be their radii (in terms of R) if drilling the holes is to reduce the rotational ...
*November 2, 2012*

**trig**

2 cos(theta-13)= square root of 3
*November 2, 2012*

**maths**

a multiply b =12 b multiply c=13 c multiply d=14 what is the answer for abcd=???
*November 2, 2012*

**Calculus**

Find the volume of the solid obtained by rotating the region enclosed by y=x^3, y=25x, x ≥ 0
*November 1, 2012*

**Calculus**

Find the volume of the solid obtained by rotating the region enclosed by y=x^3, y=25x, x ≥ 0
*November 1, 2012*

**science**

What volume of a 6.0 M NaOH solution would you need to prepare 250.0 milliliters of a 3.0 M NaOH solution?
*November 1, 2012*

**statistic**

in a random sample of 400 voter, 120 plan to vote for candidate A. determine a 95% confidence interval
*November 1, 2012*

**Physics**

Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe. d sinθ = λ d sinθ = 3λ/2 d sinθ = 3λ d sinθ = 4λ
*October 31, 2012*

**Physics**

What is the critical angle of light traveling from benzene (n=1.501) into air? 40.05o 48.22o 41.78o 62.63o
*October 31, 2012*

**Physics, newtons laws**

Let L=length of string=120cm Tsin(a)=mv^2/R, R=Lsin(a), T=mg/cos(a) mgtan(a)=mv^2/Lsin(a), mgsin^2(a)=mv^2cos(a)/L, g(1-cos^2(a))=v^2/L (cos(a)) gLcos^2(a)+v^2cos(a)-gL=0 let x=cos(a), use quadratic formula to solve for x x= (-v^2+sqrt(v^2+4L^2*g^2))/2Lg a=acos(x)=25 degrees
*October 29, 2012*

**geology **

what is the Sample Locality Age (Million years)in Granite: Scottish Highlands, Gabbro: Sudbury Canada and Gneiss: Greenland?
*October 27, 2012*

**physics**

Suppose you waik 18.0m straight west and then 25.o m straight north. How far are you from your starting point and what is the compass direction of a line connecting your starting point to yourfinal position?
*October 25, 2012*

**science**

10.6
*October 24, 2012*

**science**

How tall is the tree if the sun is at a 53° angle above the horizon and the shadow is 8.0 meters long?
*October 24, 2012*

**Calculus**

A baseball diamond is a 90 foot square with the pitcher's mound at the square's center. A runner races for home at 25 ft/sec. How fast is his distance from the pitcher changing as he crosses the plate?
*October 24, 2012*

**Algebra (Graphing Functions)**

Actually I figured it out.
*October 24, 2012*

**Algebra (Graphing Functions)**

Consider the following function. f(x) = −3x if x < −2 x2 if −2 ≤ x < 2 −3 if x ≥ 2 Please help me find the intervals on which f is increasing, is decreasing, or is constant(in interval notation). As well as the x and y intercepts for ...
*October 24, 2012*

**literature**

Reflecting on this week’s literary readings, as well as your own reading experiences, identify at least one major similarity and one major difference between the forms of the short story and the poem. How do the differences between these literary forms affect how you read...
*October 24, 2012*

**physics**

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
*October 23, 2012*

**Boolean algebra **

Simplify this function using Boolean algebra laws? I am stuck on this part of my homework (x2'x1'x0') + (x2'x1x0) + (x2x1x0') I know you have to use distributive laws to do this. Any help is appreciated. Thank you.
*October 23, 2012*

**ict**

I need help woth my cross word
*October 23, 2012*

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