Friday

September 19, 2014

September 19, 2014

Number of results: 17,942

**Statistics**

2. A researcher wants to find out how students feel about a proposal to ban smoking on campus. She selected THREE groups of “students who currently smoke”, “students who formerly smoke”, and “students who never smoke”. Also, she selects a sample of 5 students from each group ...
*October 14, 2013 by Chris*

**macroeconomics**

Assume that the government purchases decrease by 10 billion, with other factors held constant including the price level. Calculate the change in the level of real GDP demanded for each of the following values of the MPC. Then calculate the change if the government, instead of ...
*July 15, 2009 by jo*

**computing**

if you can answer these question and give the calculation that would be a great help thank you 1. Calculate the amount of storage required for a black and white bit-mapped graphic which has a resolution of 2000 x 1400 dpi. 2. calculate the amount of storage required for a 600 ...
*September 6, 2010 by LiiNa*

**Chemistry**

Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...
*October 24, 2011 by Josh*

**Physics**

Example: A plane of wingspan 30m flies through a vertical field of strength 5 x 10-4T. Calculate the emf induced across wing tips if its velocity = 150ms-1. Answer: Calculate the area swept out each second by the wings. Multiply that by the field strength, B and you have got ...
*June 2, 2008 by Meesh*

**Biochemistry**

Acetylcholinesterase catalyzes the hydrolysis of the neurotransmitter acetylcholine: Acetylcholine + H2O actetate + choline The KM of acetylcholinesterase for its substrate acetylcholine is 9 x 10-5 M. In a reaction mixture containing 5 nanomoles/ml of ...
*September 22, 2012 by Robert*

**Chem help!!**

A rock salt (NaCl), ice, and water mixutre is used to make homemade ice cream. How many grams of rock salt must be added to lower the freezing point 10.0 degrees C? I have no idea what to do, please help! delta T = Kf*i*m delta T = 10. Kf is the molal freezing point constant, ...
*May 3, 2007 by Lindsay*

**business**

For this assignment you are to imagine that you are part of a select marketing group. This select group has been asked to consider the Colorado City Convention and Visitors Bureau survey of 25 hotels in the local area. The survey is concerned with the current availability of ...
*August 2, 2010 by ron *

**physics**

In a given electromagnetic plane wave the maximumelectric field strength is 400 V/m. What is the maximum magnetic field strength? How does the energy stored in the magnetic field compare with the energy stored in the electric field at any given time? how do you calculate the ...
*December 9, 2008 by al*

**Algebra**

Compare the future amounts (A) you would have if the money were invested at simple interest and if it were invested with annual compounding. $3,000 at 11% for 20 years (a) Calculate the future amount if the money were invested at simple interest. $ (b) Calculate the future ...
*May 28, 2012 by shirley*

**Algebra**

Compare the future amounts (A) you would have if the money were invested at simple interest and if it were invested with annual compounding. $4,000 at 12% for 30 years (a) Calculate the future amount if the money were invested at simple interest. (b) Calculate the future ...
*August 28, 2012 by Sue Jackson*

**chemistry**

- What fraction of an E coli cell is occupied by its DNA? How would I find the fraction? If I knew the volume of an E coli cell, would I divide that by the volume of DNA in an E coli cell? - A human cell is typically spherical with a diameter of 20 micrometers. Calculate the ...
*September 7, 2009 by Janae*

**chemistry**

given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
*November 13, 2012 by stacy*

**chemistry**

given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
*November 13, 2012 by stacy*

**Math**

option 1: 2-by-3, 3-by-4, and 4-by-5 option 2: 2-by-2 , 3-by-3 ,and 4-by-4 option 3: 3-by-5 , 3-by-6 , and 3-by-7 For each pyramid option, calculate the total number of shoeboxes used after each row has been completed. That is calculate the total number of shoeboxes in the top...
*October 15, 2013 by Pie*

**compemtary math**

. To determine the compound amount of an investment of $10,000 with an interest rate of 6% compounded monthly after 4 years requires you to use a table factor that goes beyond the Compound Interest Table. Calculate the new table factor for this investment. Now, using the new ...
*October 3, 2013 by mary*

**Finance**

calculate of EPS and retained earning: year ended2009 with a net profit before taxes of $218000. the company is subject to a 40% tax rate and must pay $32000 in preferred stock dividend before distributing any earning on the 85000 share of common stock currently outstanding. 1...
*May 31, 2011 by sweety*

**AP CHEM!**

IM SO CONFUSED PLEASE HELP! H2 +CO2-->H2O + CO When H2 is mixed with CO2 at 2,000K, equilibrium is achieved according to the equation above. In one experiment, the following equilibrium concentrations were measured. [H2]= 0.20mol/L [CO2]= 0.30mol/L [H2O]=[CO]= 0.55mol/L a/ ...
*April 3, 2007 by linds*

**Chemistry- partial pressures**

A sample of gas collected over water at 42 degrees C occupies a volume of one liter. The wet gas has a pressure of .986 atm. The gas is dried and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 degrees C. Using this information, calculate the vapor pressure of ...
*January 1, 2007 by Dave*

**chemistry**

a drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. CALCULATE the diameter of an oil ...
*March 7, 2007 by Pedro*

**Chemistry**

Consider a mixture of the two solids BaCl2.2H2O (FM 244.26) and KCl (FM 74.551). When the mixture is heated to 160C for 1 hour, the water of crystallization is drive off: BaCl2.2H2O --> BaCl2(s) + 2H2O(g) A sample originally weighing 1.7839g weighed 1.5623g after heating. ...
*September 28, 2011 by Asuna*

**Physics**

An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.75m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is 11.5 times the cross-...
*September 3, 2014 by Santi*

**math**

2.Calculate the growth rate of Asset J dividends, we have to assume that future dividend payments will grow at a constant rate into the future forever. This constant rate can be estimated by calculating the average growth rate from the past dividends. Calculate Asset J’s ...
*September 13, 2014 by Anonymous*

**Chemistry**

The equilibrium constant Kc for the following reaction is equal to 0.20 at 250°C. Calculate the equilibrium constant Kp for the reverse reaction at the same temperature. COCl2 (g) = CO (g) + Cl2 (g) I'm sorry.. English is a second language for me. After solving for K'c and ...
*March 15, 2012 by David*

**Science**

C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts with water according to the rxn above. a. A sample of aniline is dissolved in water to produce 25.0 ml of a .10 M soln. The pH of soln is 8.82. What is Kb for this rxn? b. The soln in part b, is titrated with...
*April 12, 2008 by Francis*

**chemistry**

H2 + I2 -> 2Hl 1.2 mol of hydrogen gas reacts with 1.0 mol of iodine vapour, after 5 minutes 0.6 mol of iodine remained. A) calculate the number of moles of hydrogen that have not reacted after 5 minutes. B) calculate the number of moles of hydrogen iodide that have been ...
*December 12, 2012 by fiona*

**physics, help urgent!**

charge Q = +4.5 ƒÝC is located at the origin and is fixed so that it cannot move. A small object with mass m = 2.0 g and charge q = +8.0 ƒÝC is released from rest at point A on the x-axis at x = 2.0 cm. The small object moves without friction along the x-axis under the ...
*November 14, 2012 by Brette*

**Physics. Please please help!**

A charge Q = +4.5 uC is located at the origin and is fixed so that it cannot move. A small object with mass m = 2.0 g and charge q = +8.0 uC is released from rest at point A on the x-axis at x = 2.0 cm. The small object moves without friction along the x-axis under the ...
*November 14, 2012 by Kyle*

**Animal Physiology-Membrane Potential**

Intracellular Extracellular Na+ 12 mM 160 mM Cl- 7 mM 110 mM K+ 140 mM 5 mM 1.How do you calculate the equilibrium potential for potassium, K+, under these conditions? 2. Assuming that Na+ is the only ion the plasma membrane of this cell is permeable to, at what voltage will ...
*September 15, 2011 by John*

**chemistry**

N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. calculate the maximum amount of non-PΔV work that can be accomplished through this reaction at a temperature of 500°C. b. Determine the temperature at which the equilibrium constant...
*April 22, 2012 by chamy*

**Chemistry**

If 3.21 g of BeC2O4 * 3H2O is heated to 220 C calculate the volume of the H2O(g) released, measured at 220 C and 735 mm Hg? please help me Convert g BeC2O4*3H2O to mols BeC2O4*3H2O. Convert mols BeC2O4*3H2O to mols H2O. Use PV = nRT to calculate volume of H2O. Post your work ...
*April 8, 2007 by Karisa*

**Chemistry lab**

1) Using the 1st equivalence point from part a calculate the molarity of the phosphoric acid. Molarity of NaOH = .1523 M Volume of phosphoric acid used 10.0mL Volume at equivalence point 7.410 mL and 14.861 mL 2) Using the 2nd equivalence point from part a, calculate the ...
*April 11, 2012 by Maura*

**Calculus**

Hello, I have some calculus homework that I can't seem to get started..at least not on the right track? I have 3 questions 1. integral of [(p^5)*(lnp)dp] I'm using the uv-integral v du formula So first, I'm finding u and I think it's lnp.......so du is 1/p Then, I think dv = p...
*January 23, 2007 by Shelley*

**CHEMISTRY**

I put down all the info that I found but I cant figure out the questions 1 & 2 at the bottom!! Empty Calorimeter- 11.6 g Room temp - 21 degrees celcius Three different experiments of 50mL 1(M) HCl reacts with 0.15 g Mg, 0.25g Mg, and 0.35g Mg respectively. The maximum ...
*November 8, 2010 by Anonymous*

**Chem**

if 50 mL of .012M barium chloride are mixed with 25 mL of 1.0 x 10^-6M sulfuric acid, will a precipitate form? Calculate Qsp. Compare with Ksp. I never learned what Qsp is, what do I do? Qsp = (Ba^+2)(SO4^-2) [That's Ksp, also; however, Ksp is at equilibrium and has a constant...
*May 7, 2007 by Anonymous*

**Chemistry - Science (Dr. Bob222)**

Posted by Ana on Saturday, May 3, 2014 at 11:23am. A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The mass of ...
*May 5, 2014 by Ana *

**Astronomy**

Basically the ``Bohr radius'' for the dark matter is rB=ℏ^2 / GN M m^2 where m is the dark matter mass, M is the total amount of dark matter mass contained inside the ``gravitational atom'', and ℏ and GN are constants as usual. Taking the dark matter to be of ...
*October 1, 2013 by qwerty*

**Physics Grade 11**

I need Help answering this question what equations do i use from Newton's Law and how to solve it. I Have a test on Wednesday and im lost please help.!!! A piano is to be slid across the floor.IT had a mass of 450 kg. A) Calculate the normal force supporting the piano. B)If ...
*November 8, 2010 by Hena*

**finance, please help**

1. Calculate the present value of an investment given the following information: (a) Years—20, (b) Rate—10%, and (c) Future Value—$20,000. 2. Calculate the future value of an investment given the following information: (a) Years—10, (b) Rate—5%, and (c) Present Value—$10,000. ...
*June 3, 2012 by farah*

**Trigonometry**

When viewing Angel Falls (the world's highest waterfall) from Observation Platform A, located on the same level as the bottom of the waterfall, we calculate the angle of elevation to the top of the waterfall to be 69.30°. From Observation Platform B, which is located on the ...
*June 16, 2012 by Tim*

**Trigonometry**

When viewing Angel Falls (the world's highest waterfall) from Observation Platform A, located on the same level as the bottom of the waterfall, we calculate the angle of elevation to the top of the waterfall to be 69.30°. From Observation Platform B, which is located on the ...
*June 16, 2012 by Anonymous*

**business Math**

Carl Sonntag wanted to compare what proceeds he would receive with a simple interest note versus a simple discount note. Both had the same terms: $19,500 at 8% for 2 years. Use ordinary interest as needed. a. Calculate the simple interest note proceeds. Can someone help me? ...
*April 7, 2014 by marie*

**Chemistry**

Calculate [H3O+] in the following aqueous solution at 25 ∘C: [OH−]= 1.9×10−9M Calculate [H3O+] in the following aqueous solution at 25 ∘C: [OH−]= 2.1×10−2M Calculate [H3O+] in the following aqueous solution at 25 ∘C: [OH−]= 6.1×...
*April 29, 2014 by Brandon*

**volume:ration**

A worm has a diameter of 2.4cm and its length is upto 1.9M. a)How do I calculate the surface area? b)How do I calculate the volume? c)How do I work out the volume ratio of the worm? Please help! Thanx kim xxx Surface area= PI*2*radius * length] Volume= PI * radius^2 * length ...
*November 17, 2006 by Kim*

**math --- can someone help me pls?**

can anyone help me with these 2 questions pls? Calculate the slant height for the given cone. Round to the nearest tenth. (1 point) Diameter = 8 Height = 9 10.2 cm 11.4 cm 9.8 cm 12.0 cm Calculate the length of the diagonal for the given rectangular prism. Round to the nearest...
*February 26, 2014 by TTR+S<3 *

**physics college**

An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is its acceleration? A car is stopped at a traffic light. It ...
*October 8, 2010 by meera*

**Chemistry**

The standard enthalpies of formation of ions in aqueous solutions are obtained by arbitrarily assigning a value of zero to H ions;that is, delta H(f) [H+(aq)]=0 A.for this reaction: calculate delta H(f) for the Cl- ions. HCl(g) ==H2O==>H+(aq)+Cl-(aq) delta H= -74.9 kJ/mol (...
*October 31, 2010 by Kristin*

**chem help w/ Lab**

Weight of the mustard package Sample: 3.02 (g) Weight of the mustard package Solution: 33.3 (g) Trial #1 Trial #2 Trial #3 Weight of Mustard Package Solution Delivered (g) : 1.09 .948 .909 Weight of NaOH Solution Delivered (g) : .354 .304 .269 Concentration of NaOH : 7.48e-3 (...
*October 17, 2012 by Den*

**Biology**

Zucchini cores placed in sucrose solutions at 27oC resulted in the following percent changes after 24 hours: % change in mass [Sucrose] 20 distilled water 10 0.2 M -3 0.4 M -17 0.6 M -25 0.8 M -30 1.0 M Graph the results and find the molar concentration of solutes within the ...
*October 11, 2007 by Harry*

**science(chem)**

I did a dehydration rxn with 1.424g of 4-methylcyclohexanol with .40ml 85% H3PO4 and 6 drops of concentrated H2SO4. I have to calculate the limiting reagent even though I do suspect it to be the 4-methylcyclohexanol. I do know the ratio is 1mol H3PO4: 3mol 4-methylcyclohexanol...
*December 2, 2007 by ~christina~*

**Chemistry DrBob**

I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work, thanks (A). A reaction ...
*April 27, 2011 by Ben*

**Chemistry- college**

The standard enthalpies of formation of ions in aqueous solutions are obtained by arbitrarily assigning a value of zero to H ions;that is, delta H(f) [H+(aq)]=0 A.for this reaction: calculate delta H(f) for the Cl- ions. HCl(g) ==H2O==>H+(aq)+Cl-(aq) delta H= -74.9 kJ/mol (...
*November 1, 2010 by Willy*

**stats**

The following data were collected from a case-control study of breast cancer and fat intake: case control High-fat diet 10 5 Low-fat diet 40 55 50 60 Statistical inferences for odds ratios are based on the natural log of the odds ratio, rather than the odds ratio itself (...
*July 16, 2013 by thane*

**Algebra **

The cost, in millions, to remove x% of pollution in a pond is modeled by the equation: . What is the cost to remove 75% of the pollution? Hint: Plug in and calculate, do not convert to a decimal. what value of x would make the equation undefined? Hint: Think about what makes ...
*December 13, 2011 by Chelsea*

**Chemistry**

Two Flasks containing the same inert gas are at the same temperature and pressure of 800 mmHg. One flask has volume of 1.0 L and the other, a volume of 2.0 L. Enough volatile liquid is injected into each of the flasks to allow phase equilibrium to be established. No leakage ...
*January 31, 2007 by Jason*

**Chemistry**

An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The flask is sealed, cooled to room temperature, and weighed. The mass is now 129.225g. The measured P atm is 757.7 torr. The flask is rinsed and filled ...
*July 13, 2008 by Anonymous*

**Chemistry**

An empty flask weighs 128.632g. After vaporization of a sample of volatile liquid, at a measured temperature of 99.8 C. The flask is sealed, cooled to room temperature, and weighed. The mass is now 129.225g. The measured P atm is 757.7 torr. The flask is rinsed and filled ...
*April 6, 2011 by Shannon*

**Physics **

A 21.1 g ball of clay is thrown horizontally at + 38.7 m/s toward a 1.2 kg block sitting at rest on a frictionless surface. The clay hits and sticks to the block. A. What is the speed of the block and clay right after the collision? m/s B. Use the block's initial and final ...
*November 7, 2012 by Courtney *

**physics**

please help i cannot figure this out A 0.27 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s. Find the momentum of the ball of dough halfway to its maximum height on the way up. and A 61 kg pole-vaulter falls from rest from a height of 6.6...
*March 21, 2011 by luke*

**Chemistry**

Calculate the final concentration for the standardization of KMnO4 given this information: 2MnO4- + 5C2O4^-2 + 16H+ -> 2Mn^2+ + 10CO2 + 8H2O [final redox equation] Volume of KMnO4 titrated with H2SO4 + Na2C2O4 = 293 mL Volume KMnO4 titrated with H2SO4 alone = 0.2 mL Amount ...
*May 2, 2012 by Katherine*

**Chemistry**

Concentrated sulfuric acid is 18.4 molar and has a density of 1.84 grams per milliliter. After dilution with water to 5.20 molar the solution has a density of 1.38 grams per milliliter. This concentration of H2SO4 is often used in lead storage batteries(like a car battery). 1....
*January 13, 2011 by K*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**mechanics of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 10, 2013 by dmkp*

**Physics**

Assume that in interstellar space the distance between two electrons is about 0.87 cm. The electric force between them are repulsive. Calculate the electric force between these two electrons. The value of the Coulomb constant 9 × 109 N · m2/C2 and the elemental charge is 1.6...
*March 3, 2013 by Terry*

**Microecon**

Using the midpoints approach to the cross elasticity of demand-calculate the cross eleasticity the demand for golf at all 3 prices. Price Demand1 D2 D3 50 15 10 15 35 25 15 30 20 40 20 50 D1 -Income $50k per yr, movies $9 D2 -Income $50k -movies $11 D3 -Income $70k -movies $11...
*November 1, 2012 by AJ*

**I need HELP bad! Macroeconomics!**

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal gains, calculate how much ...
*May 20, 2008 by Sarah*

**physical**

A proton resistor spring system in a magnetic field going out of the page has a mass of proton 1.67*10^-27 kg, a spring constant k=500 N/m and the resistor has r=5Ω. The magnetic field strength is 0.8T. a) When released from rest, calculate the maximum displacement. b) ...
*March 30, 2010 by Thomas *

**Physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 31.0 m above sea level, directed at an angle q above the horizontal with an unknown speed v0. a. The projectile remains in flight for 6.00 ...
*November 5, 2009 by Anonymous*

**Physics**

Calculate the Patm And the pressure exerted by water on the block - The area Of the upper face of block is 40 cm2 Calculate the total pressure exerted on the solid Given : In the first tube : in a tube a solid .. the height from solid to the water level in the tube is 8o cm & ...
*April 23, 2010 by Nana*

**mechanical properties of materials**

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a) Calculate the maximum hoop ...
*February 9, 2013 by dmkp*

**Physics**

A. Calculate the force on an alpha particle in an electric field E=Exm where E=3.6E4 N/C and x is a unit vector in the x direction. What is the direction of the force? B. Calculate the acceleration of the alpha particle in this electric field. What is the direction of the ...
*December 11, 2011 by Kate*

**physics**

A copper calorimeter of mass ()g contains 380g of a liquid at 12degrees Celsius. A 20W heater is used for 3 minutes to raise the temperature of the liquid and calorimeter to 17 degrees Celsius. The calorimeter has a specific heat capacity of 400 J/K kg a.Calculate the heat ...
*March 22, 2012 by Matteo*

**Chem**

(a) Use Boyle's law to calculate the volume the gas will occupy if the pressure is increased to 1.79 atm while the temperature is held constant. 3.17 L (b) Use Charles's law to calculate the volume the gas will occupy if the temperature is increased to 175°C while the ...
*May 8, 2014 by Sarah Pick*

**calculus**

calculate Äƒ/Äx and Äƒ/Äy. ƒ(x,y) = xy² + x²y
*December 8, 2007 by Anibal*

**math**

And if f(x)=1/2 and g (x)=x-2 how do i calculate: F-1 (4)
*April 15, 2008 by lance*

**math**

calculate (x-3)(x+2)
*May 7, 2008 by jenna*

**Statistics**

Calculate: 8 8 7 6 8 7 6 5 P P P P C C C C 3 4 6 1 3 5 2 0
*March 25, 2011 by Pavlos Cs*

**math**

calculate 10^1.27 how do i do this?
*May 12, 2012 by hannah*

**calculus**

Calculate dy/dx if Ln(x+y)=e^x/y
*November 17, 2011 by Tracy*

**Chemistry**

[H^+] = 2.7 x 10^-3 Calculate for [OH^-] [OH^-] = ? M
*February 26, 2012 by Matt*

**Algebra**

How do I calculate 4^n=1/(2(n-n^2))? Thanks.
*March 1, 2012 by Helga*

**Economics**

how to calculate Qd=15.0-0.2P
*March 3, 2012 by Dee*

**algebra**

Calculate. 7[6+(8)^3]
*July 25, 2012 by Christina*

**math**

f f(x) = 2x and g(x) = ½ , calculate f(x) • g(x)
*August 31, 2012 by gff*

**maths**

how to calculate 36^6/7 ???
*February 11, 2013 by tuhituhi*

**math**

calculate: 6% + 1.2 * 8%
*November 30, 2013 by Serenity1*

**physics**

a worker lays a rubber handled 0.500kg hammer down a sloped roof. it slides down the roof to a level portion of the roof where it slides another 2.oo m long this horizontal surface. the coefficient of friction between the rubber handle and the shingles is 0.850 a)draw free ...
*January 12, 2013 by teed*

**Stats ()**

Coal is carried from a mine in West Virginia to a power plant in Pittsburgh in hopper cars on a long train. The automatic hopper car loader is set to put 75 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed with an average of...
*July 12, 2013 by penelope*

**physics**

A proton resistor spring system in a magnetic field going out of the page has a mass of proton 1.67*10^-27 kg, a spring constant k=500 N/m and the resistor has r=5Ω. The magnetic field strength is 0.8T. a) When released from rest, calculate the maximum displacement. b) ...
*March 30, 2010 by Thomas *

**Chemistry**

XeF2 is a linear molecule with vibrational frequencies of 515 cm–1 (symmetric stretch), 555 cm–1 (antisymmetric stretch) and 213 cm–1 (bend). A vibrational Raman spectrum is acquired using radiation at 488 nm from an argon-ion laser. Predict, with justification, which ...
*May 22, 2011 by Alice*

**Grade 12 physics**

At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the magnitude of the ...
*September 29, 2013 by keisha*

**Macroeconomics**

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal gains, calculate how much ...
*May 20, 2008 by Sarah*

**physics**

in an electron microscope, a tungstun cathode with work function 4.5 eV is heated to release electrons that are then initially at rest just outside the cathode. The electrons are accelerated by a potential difference to create a beam of electrons with a de Broglie wavelength ...
*June 9, 2008 by shelly*

**Chemistry**

You are asked to prepare 500. mL of a 0.150 M acetate buffer at pH 5.00 using only pure acetic acid, 3.00 M NaOH, and water. Calculate the quantities needed for each of the following steps in the buffer preparation. 1. Add acetic acid to ~400 mL of water in a 500 mL beaker. ...
*September 28, 2012 by Kw1h*

**Economics**

Help The answer i got is : GDP grew 10% GDP for 2006 using 2005 as the base year increase by 20% real GDP grow? 10% If i'm right, let me know, if not, please show Calculation Thank You Use the following data to answer questions 1-3 (be sure to provide all calculations). ...
*December 1, 2008 by Randy Johnson*

**physics**

Two pucks collide on an air hockey table. Puck A has a mass of 17.0 g and is initially traveling in the +x direction at 7.00 m/s. Puck B has a mass of 51.0 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 52.0 deg above the +x axis, while ...
*March 24, 2014 by Tsion*

**Chemistry**

The ionisation of water plays an important role in the equilibria of aqueous solutions. Kw= 1.008 x 10-14 mol2 dm-6 at 298K. (a) Calculate the pH of the following solutions at 298K showing all your working. Assume full dissociation in each case. (i) 0.054 mol dm-3 aqueous HNO3...
*April 22, 2012 by Henry*

**Chemistry**

Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1. Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases. The chemical equation for the combustion of butane is: 2C4H10(g) + 13O2(g) → ...
*February 10, 2012 by JRMM*

**Physics **

A block of mass m1 is connected to an empty bucket of mass 1.35 kg by a cord over a frictionless pulley. The coefficient of the static friction between the table and the block is 0.45 and the coefficient of kinetic friction between the table and the block is 0.32. Water is ...
*May 2, 2011 by Mawuli*

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