Questions Asked on
June 29, 2011

Chem
What is the mole fraction of H2 in a mixture with the total pressure of 800 torr when the partial pressure of H2 is 90 torr?

world history
which kingdom controlled caravan trade routes in A.D.900?

Physics
What hanging mass will stretch a 1.9mlong, 0.54mm  diameter steel wire by 1.2mm ?

Chem
In an experiment, 25.0 ml of a gas with a pressure of 1. atm is contained in a balloon at 25.0 c. The Balloon is then cooled to 5.0 c, and the pressure is found to be .750 atm. What is the volume of the gas under the new conditions?

College Physics
6. A tall bald student (height 2.1 meters and mass 93.1 kg) decides to try bungee jumping from a bridge. The bridge is 36.7 meters above the river and the "bungee" is 25.3 meters long as measured from the attachment of the bridge to the foot of the jumper.

english
Could you let me know if these are correct? Write 5 sentences in which you address changes in your writing: 1) Working with a friend has made my sentence structure better. 2) I now recognize runone sentences,and try not to use them. 3)I still get confused

Chemistry
When 320.62 grams of Bi2O3 react with excess of C, how many moles of Bi form?

physics
before ice can form on a lake, all the water must be cooled to?

Chemistry
How many grams of KOH must be dissolved in one litre of solution to give it a pH value of 12?

comp 155
could you see if i did these sentences right? Sentence Correction and Changes in Writing Review the following sentences. Some of them are correct, whereas others contain an error with a commonly confused word. Identify those with errors by marking each of

Programming
2. Then it should prompt the user for the input file name of the file containing the data to sort. 3. If the program can't open the file or if no file name is entered (^d or ^z is entered for EOF), it should print an error message and exit. 4. The file

Trignometry questions EASY HELP
1. Which is a solution to the equation below? sin2xsecx=1 2. What is the exact value of cos15 degrees? 3. Which expression is equivalent to the expression below? cos^2 xsin^2? 4. What is the exact value of cos2theta? one side is 8 and the other is 15 5.

Physics
What is the angular momentum of the second hand on a clock if the clock has a length of 25cm, a mass of 20g, and is rotating with constant angular velocity. Treat the second hand as a thin rod.

physics
A 4.5kg ham is thrown into a stationary 15kg shopping cart. At what speed will the cart travel if the ham had an initial speed of 2.2 m/s? If the ham hits the cart with 2N of force, how long did the collision between the two last?

Physics
an object of mass 3 kg is moving in the positive xdirection with a speed of 10 m/s. A second object of mass 5 kg is moving in the northwest direction with a speed of 8 m/s. If the two stick together after the collision, what is the final velocity

Algebra
Completely factor the following expression:100x2 â€“ 160xy + 64y2

Chem
A Baloon is filled with 3.00 L of helium at a pressure of 765 Torr. What is the volume of the baloon at an altitude where the atmospheric pressure is 530 torr?

Chem
In an experiment, 7.5 mol of a gas are held in a 3.5 L container at 39 c. What pressure does the gas exert if it is assumed to be ideal?

math
You are 64 inches tall and your shadow is 72 inches long. A tree casts a shadow of 144 inches. How tall is the tree?

geometry
what is the volume of a square prism with a height of 8 and a base with side measure of 11?

Physics
How much heat must be transferred to each kilogram of aluminum to bring it to its melting point, 660°C, from room temperature, 20°C?

geology
Why is weather still unpredictable?

Chemistry
Find the strength of 2.45 gm of (H2SO4) in 250 ml of the sol.

Chemistry
Ph of a sol. Containing 3.2 gm of hcl dissolved in 1 litre of water.

Chemistry
Calculate [H+], [OH] & ph of strong acids strong base.

Chemistry II
Calculate how many milliliters of 0.100 M HCl must be added to 25.0 ml of a 0.200 M solution of NH3 to prepare a buffer that has a pH of 9.50? Kb = 1.76 x 10^5

Chemistry
Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^5.

science
which of the following absorbs hear from the surroundings as it proceeds to completion? 1. CO(g)+1/2 O2 (g)=CO2 (g) 2.AL2O3(s)=2 Al(s) + 3/2 O2 (g) 3.SO3 (g) + 99.2kJ=S (s)+3/2 O2 (g) Hrxn = 283.0 kj (endothermic)

Calculus 2
A cone is filled w/ freshwater (w=62.4 lb/ft^3). Determine the total force on the inside of the cone. Height of 10 and base of 12.

algebra
Define the term equation and then explain what it means to solve an equation. Hi every time I try to explain it I get my words all jumble up. I know what it is and how to solve just cant explain it.

chem
Determine the density of methane (CH4) in g/L at 21.9oC and 0.9 atm

chemistry
is energy considered a chemical reaction that is important to a healthcare professional

College Physics
1. A spring gun is made by compressing a spring ina tube and then altching the spring at the compressed position. A 4.97g pellet is placed against the compressed and latched spring. The spring latches at a compression of 4.06 cm, and it takes a force of

algebra
The number of computers sold by BCC depends on the dollar amound,x, that they spend on advertising. How much must they spend to sell 200 computers? Round to the nearest dollar and do not include units in your answer. N(x)=100+20 * In(0.25x)

chm I
Lithium hydride reacts with water as follows. LiH(s) + H2O(l) >LiOH(aq) + H2(g) During World War II, U.S. pilots carried LiH tablets. In the event of a crash landing at sea, the LiH would react with the seawater and fill their life belts and lifeboats

math
covert the number to decimal notation. 6 6.70 x 10

Chemistry
The reaction for the metabolism of sucrose, C12H22O11, is the same as for its combustion in oxygen to yield CO2(g) and H2O(l). The standard heat of formation of sucrose is 2230 kJ mol1. Based upon data in Table 6.2 and problem 6.75 the amount of energy

Algebra
The answer is the easy part (88%  $216,600), but how do I express the below in an algebraic formula? Ken purchased an investment property for $245,000 and sold it at a 12% loss. How much did he sell it for?

Chem balancing equation
C5H602+O2 > CO2+H2O what is the coefficient of O2?

Chemistry
Which pair of samples contains the same number of hydrogen atoms two moles of NH3 and three moles of N2H4 two moles of NH3 and one mole of N2H4 four moles of NH3 and three moles of N2H4 one mole of NH3 and one mole of N2H4

algebra
solve system graphically. be sure to check your solution. if a system has infinite number of solutions, use set builder notation to write the solution det. if a system as no solution, state this. a=1+b b=52a

physics
A 6kg bowling ball rolling at 5 m/s strikes a stationary 4kg bowling ball. If Ball #1 is moving forward at 2 m/s after the collision, what is the speed and direction of Ball #2? What is the impulse of the system? If the collision last for .5 seconds, how

linear function
solve 13x+2y=6 in the form of f(x)=mx+b

albebra
The answer is the easy part, but how do I express it in an algebraic formula? Ken purchased an investment property for 245,000 and sold it at a 12% loss. How much did he sell it for?

college phyics
A system consists of 3.2 mol of the monatomic gas neon (which may be treated as an ideal gas). Initially the system has a temperature of 290 K and a volume of 1.2 m3. Heat is added to this system at constant pressure until the volume triples, then more

Physics
Can gravity friction and tension be all centripetal forces?

college physics
Calculate the ratio (pure number) of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is half its amplitude

Physics
Is an airplane flying round trip at a constant speed an example of uniform circular motion or is a record player rotating at a record speed?

Physics
Which of the following contains the most mechanical energy? A 10 kg ball at the top of a hill 10 meters high A 5 kg ball rolling with a velocity of 12 m/s A 10 kg ball rolling with a velocity of 5 m/s A 5 kg ball at the top of a hill 10 meters high I think

Math (Urgent)
Use the Midpoint Rule to approximate the integral (–10x+7x^2) from 10 to 17 with n=3

TRIGONOMOTRY
SIN 0=? O = 8 H = 16

Skype
is skype known as a website or a software?

Chemistry
How do you calculate the following: Starting with a liter of 1M sodium acetate (pka of acetic acid = 4.75 ), calculate the number of moles of strong acid or strong base needed to make a pH buffer effective at pH = 4.o ? Thank you!

Algebra
Andrew factored the expression 20x^312x^2+8x as 4x (5x^212x^2+8x). But when Melissa applied the distributive law and multiplied out 4x (5x^212x^2+8x), she got 20x^348x^3+32x^2; thus, Andrew’s solution does not appear to check. Why is that? Please

Health Promotion and Education Interventions in Di
Describe the leadership principles and skills needed to develop a health promotion project.

science
Describe the plant life, animal life, and geology of the ecosystem in the area in which you live. I live in Northern Illinois. What populations and communities are present? How dependent is your community on this ecosystem? What are the limiting factors of

maths
give a real world situation in which this concept applied personal

Chemistry
If you have 200 ml of a 0.1M solution of acetic acid (pka=4.75), 1. How many ml of a solution of 1.O M NaOH would you need to adjust the pH to 5.2? 2. How many ml of water would you then add to make the solution of 0.05M in total acetic acid (ie., acetic

chemistry
Balance point of HCL

Chemistry
How do you calculate the number of moles of NaOH to add to a liter of 1M NH4CL (pka of NH4+ = 9.25 ) to produce a solution buffering the pH at 8.75 ? thanks

Accounting Principles
answer question Jane Kent is a licensed CPA. During the first nonth of operations of her business, the following events and transactions occurred

Algebra
Completely factor the following expression:100y2 â€“ 36z2

sst
how to get information on trade,craft and cities

Algebra
Megan factored the expression 12x^2 +52x35as (2x+5)(6x7). But when Jacob applied the FOIL principle and multiplied out (2x+5)(6x7), he got 12x^2+44x35; thus, Meganâ€™s solution does not appear to check. Why is that? Please help Megan to

Business
Post at least 2 challenges that many companies face in the areas of ethics and 2 challenges in the area of social responsibility What exactly is management's role in addressing each of these issues?

english
Could anybody check my English essays? I'm looking for native English teacher who is willing to help me with improving my written language. For achieving this goal I'm going to write rather long essays on humanitarian subjects. I don't need lengthy

Physics
At car (1140kg)traveling at 24.8 m/s and truck (12600kg) have a headon collision and then stick together. What is their final common velocity (m/s)? (assume the car is going in the positive direction) What is the cars' change in momentum in the above

geometry
abcd is a rectangle such that ab=3 radical sign 48+2 radical sign 75+4radical sign108 and Bc=4 radical sign 27 +radical sign 300 prove that abcd is a square

algebra
what is the solution of comparison of 2(xy)=14 and x+2y=2

Chemistry
How many milliliters of 1.237 M HCl are required to react with 27.02 grams of MgCO3 ?

Chemistry
How many grams of C are required to make 431.47 grams of C3H8?

Chem
What is the volume of a gas that exerts a pressure of 457 mm Hg, if it excerted a pressure of 250 atm when its volume was 25.0 ml.

math
what is the simple interest on $562 at 0.046% per day for 12 months

Com
Is there a way to submit an essay for review without someone being able to copy it??

algebra
solve x+7y=8 x=47y

Trigonometry
What is the upper and lower limit of F(x)=3x^2+6x^22x2?

English
Can you check these few sentences, please? 1) Wait! I'll help you with your shopping. I'll take the shopping for you. 2) Do you know what will happen if you don't pay the bill? 3) As soon as he finishes school, he'll look for job. The station is too far

geometry
if ac=7x+5 and bd=14x2,what is the value for ac?

gov
For the first eleven years of its existence, the United States was a _____.

chemistry
what pressure (atm) is exerted by a column of ethanol 86.0 cm high? the density of ethanol is 0.789 g/cm3 and 9.8 m/s2 as your gravitational constant.

spanish
Su novio la mas increible?

exp of math
determine the simple interest p= $600, r= 0.043% per day, t= 12 months

physics
At car (1140kg)traveling at 76.04 m/s and truck (12600kg)traveling 6.88 m/s have a headon collision and then stick together. What is their final common velocity (m/s)? (assume the car is going in the positive direction) What is the cars' change in

exp of math
sorry I copied the problem wrong determine the simple interest p= $660, r= 0.043% per day, t= 12 months

Physics
A vertical spring has one end attached to the ceiling and a 2.50 kg weight attached to the other one. When the system is at rest, the spring is stretched by 20.0 cm. Now let the weight drop from a position in which the spring is not deformed at all.Use the

Calculus
Am I right so far? G(x)=e^x sqrt(1+x^2) =e^x(1+x^2)^1/2 =e^x(1/2)(1+x^2)^1/2(2x) + e^x(1+x^2)^1/2 So I used product rule, chain rule, and exponential function with base e

Physics
A 2.00 kg block is pushed against a 400N/m spring, compressing it 22.0 cm. When the block is released, it moves along a frictionless horizontal surface and then up an incline. The angle of the incline is 37.0 degrees and the coefficient of kinetic friction

algebra2
estimate the probability of choosing "E" tile. Write your answer as a decimal.

Science
How are precipitates used in industry?

english
if i give you a paragraph can you point out the adverbs and adjectives?

physics
A child is pushing a shopping cart at a speed of 1.5 m/s. How long will it take this child to push the cart down an aisle with a length of 9.3 m?

arithmetic
WHAT IS THE ARITHMETIC MEAN OF 3, 5, 7, 9 AND 11

chemistry
how many grams of sodium chloride are produced if 25.00 mol of sodium hydroxide are used

multiplying decimals
how do you multiply 2.08 times 0.9

science
In the United States we are fortunate to have an abundant supply of food, and much of this is due to our agricultural technology. However, there are many concerns about our food source including genetically modified crops, the use of more chemicals, and

math
convert the following base 10 number to the number in the indicated base. 43 to base 4

Physics
A 50story building is being planned. It is to be 200.0 high with a base 48.0 by 66.0 . Its total mass will be about 2.5×107 , and its weight therefore about 2.5×108 . Suppose a 200 wind exerts a force of 860 over the 66.0 wide face . Part A Calculate

calculus
Demostrate that: d/dx [tan^1(x)]= 1/1+ x^2 > using implicit differentiation.

english 3
The beauty and splendor of Gatsby's parties masked the innate corruption within the heart of the Roaring Twenties. JazzAge society was a bankrupt world, devoid of morality, and plagued by a crisis of character."

algebra/trignometry
if angle x is 30 degrees and side yz is 10ft, how long is side xy?

Algebra 1
Find Each Sum Or Difference. (13x + 9y)  11y

Algebra 1
Find Each Sum Or Difference. Its addition. 3a+2b  7c 4a+6b+9c 3a  2b  7c

biology
compare fermentation and cellular respiration. i found the contrast of these two but couldn't find the comparisons for these.

math
multiply then simplify by factoring if possible √3 √6=

chemistry
at what temperature will a gas sample occupy 6.6L if it originally occupies 14.1L at 14.4 degrees celcius

physics
A parachute reaches terminal velocity. F drag Fg=850N what is the value of F drag? What is the net force? What is the acceleration? Are the forces balanced or unbalanced?

maths
how can i solve this question disney has 2 clocks.unfortunately both of them are faulty.1 of them loose 2 mintues every hour while the other gains during that time.he sets both of them correctly at midnight on 31 decemeber 2003 that is at the precise

math
which of the following is an equation of the line that passes through the point 95/3,7) AND HAS A SLOPE OF 3/4

arithmetic
Find the 30th term of the arithmetic sequence: an = 7 + (n – 1)(2)

chem
At 36.4°C a sample of ammonia gas exerts a pressure of 6.8 atm. What is the pressure when the volume of the gas is reduced to onefourth of the original value at the same temperature

soc
In "Some Moral Minima," Lenn Goodman argues that there are certain things that are simply wrong. Do you think Goodman is right? Using specific examples, explore the challenges Goodman presents to relativism. Determine whether you think there are such

Chemistry
Will ph value of water be same at temp 25°C & 4°C? Justify it.

Chemistry
Will ph value of water be same at temp 25°C & 4°C? Justify it.

chemistry
what pressure (atm) is exerted by a column of ethanol 86.0 cm high? the density of ethanol is 0.789 g/cm3 and 9.8 m/s2 as your gravitational constant.

Bus 13Principals of Management (community College
How is a case study written? I have to write a 34 page case study on the following: With annual revenue of $430 billion, 2 million employees, and 7,300 stores worldwide (and even larger numbers by the time you read this), WalMart is the largest company

Chemistry
Will ph value of water be same at temp 25°C & 4°C? Justify it.

Chemistry
Calculate the ph of 10^8 M (HCL).

Chemistry
Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^5.

physics
A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball?

physics
Carlos does a chinup in gym class and raises himself 0.8 m. If Carlos has a mass of 62 kg, how much work does he accomplish?

statistics
the distribution of heights of American women aged 18 to 24 is approximately normally distributed with mean 65.5 inche and standard deviation 2.5 inches. what is the probability that a randomly seleted woman is between 60 and 64 inches tall?

Math
log[7.1x10^3]

math
perform the indicated operation 6√45  8√125

Historyhelp me please!
what are the roles of the special forces in the movie Black Hawk Down?? please give examples!!!

Algebra II
How do I solve the following problems?? 1. Factor: 4x^2100y^2 2. Factor: 3x^2+27 3. Solve 3x^2+9x=0 4. Solve 12^2+30x=12 5. 9a(a+1)=4 6. Solve 16x^2=25

chemistry
If you have a solution containing 0.10 M Fe+3 and 0.10 M Ca+2 and you want to titrate the Fe+3 with EDTA, how much error is there due to the reaction of Ca+2 with the EDTA at the Fe+3 equivalence point if you titrate at the following pHs. 3.0 6.0 10.0 At

physics
A 0.55 kg object connected to a light spring with a force constant of 20.0 N/m oscillates on a frictionless horizontal surface. If the spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the object. (b) Determine the

math
1)4x^+16x=48 2) 3x^+72=30x

HCS/533
WHAT IS AMR?

math
covert the number to scientific notation. 19,720 =

Early childhood education
How could a teacher introduce additional science activities or materials related to children own spontaneous play.

statistics
n = 26, area to the right is .025

Trigonometry
The question was: "Given that sin theta is 1/2 and theta is in quadrant IV, find the cos and tan of theta." I found 1/2 for cosine and 1 for theta, but the answer sheet said I was incorrect. I am almost positive I did this correctly... can someone double

chemistry
Calculate the concentration of all the ions and species in a solution (there are 6) made by dissolving 1.49 g of sodium resorcinate (Na2 C6H4O2) in 100.0 ml of distilled water.

Algebra 2
In(e^16x)=8 Solve for x.

calculus
Find the second derivative of: h(t)= (t^2 + 5)^8

Informal Logic
Consider a debate over whether prayer should be allowed in public schools. Explain what logic can and cannot do. In other words, what kinds of questions and topics are not decided by logical analysis?

Physics
A block is executing simple harmonic motion on a frictionless surface with an amplitude of .100m. At a point 0.060m away from equilibrium point the speed of the block is 0.320m/s. What is the period? What is the displacement when the speed is 0.20m/s?

English
Can you please check these sentences? Thank you. 1)How does Eveline earn a living? What is she like? She is submissive, tired, confused and unsure. 2) She was sexually abused by her father. 3) What does she think of while she is sitting waiting for the

Grammar
Each of my friends are known for extraordinary talents. Each of my friends is known for extraordinary talents. I believe it's the first one.

History
Did Islam enforce a patriarchal gender system? Cite examples from the reading to support or dispute this statement.

math
Lauren and mark obtained a 20 year 120,000 conventional mortgage at 10.5% on a house selling 150,000. their monthly mortgage payment including principal and interest is 1197.60. determine the total amount they will pay for their house. how much of the cost

Early childhood education
What is an example of how to assess childrens understanding of numbers

Early childhood education
scientific processes

English
Can you please tell me which expressions are possible? Thank you. 1) Women had to provide an education to children Better: they had to provide children with an education, they were in charge of children's education, they were entrusted with (?)/responsible

maths
3/4 + 11/12

Chemistry
Write a balanced net ionic equation for the oxidation of metallic copper to Cu(II) ion by hot concentrated H2SO4, in which the sulfur is reduced to SO2