1. Chemistry

    Butanone, CH3CH2COCH3, has a vapor pressure of 100. Torr at 25°C; at the same temperature, propanone, CH3COCH3, has a vapor pressure of 222 Torr. What mass of propanone must be mixed with 322.0 g of butanone to give a solution with a vapor pressure of 135

    asked by Cairy on February 10, 2010
  2. chemistry

    2H2 + O2 yield 2H2O to calculate bond enthalpy, we have to take bond breaking minus bond making, how do we know which one is bond breaking and bond making

    asked by bme1 on March 12, 2010
  3. algebra3

    which inequality is tge solution of 6x negative 3 greater than or = to 7 plus 4x? a.}x is greater than or =to negative 5 b.}x is greater than or= to 5 c.}x is less than or = to 5 d.}x is less than or = to negative 5 Your problem: 6x - 3 ≥ 7 + 4x Solve an

    asked by Darius Graham on January 11, 2007
  4. physics

    An airplane with a speed of 53.8 m/s is climbing upward at an angle of 42° with respect to the horizontal. When the plane's altitude is 840 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by Sarah on September 24, 2014
  5. physics

    An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by S on September 19, 2014
  6. College Physics

    A 22 turn circular coil of radius 5.00 cm and resistance 1.00 is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.0100t + 0.0400t2, where t is

    asked by Anand on March 15, 2012
  7. college marketing

    Assume that you are an NBA team owner who wants to build an arena with a budget of $400 million. You will provide $200 million of your own funds, but must finance the remaining balance. Calculate your total loan payment based on the following information:

    asked by Anonymous on August 6, 2010
  8. physics

    "Charges of 2.00uc and -3.00uc are located in a coordinate plane at(2.00cm, 5.00 cm) and (3.00cm, 2.00cm) respectively. calculate the magnitude and direction of the electric field created by this pair at the origin. express your answer in both polar and

    asked by seahill on February 1, 2011
  9. physics

    An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by tish on February 10, 2011
  10. Economics-HELP!

    1. Consider testing of chemicals for potential carcinogens. To properly test each chemical costs $10 million. If Q chemicals are tested a typical household places value $(1 - 0.01×Q) on each chemical tested. There are 100 million households in the U.S.

    asked by anonymous on November 23, 2009
  11. physics

    a particle a of mass 2kg and particle b of mass 1kg are connected by alight elastic string c, and initially held at rest 0.9m apart on a smooth horizontal table with the string in tension. they are then simultaneously released . the string releases 12j of

    asked by isaac on July 7, 2013
  12. ALGEBRA

    Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. Assume 365 days in a year. (Round your answer to the nearest cent.)

    asked by Chris on May 20, 2012
  13. physics

    An airplane with a speed of 88.0 m/s is climbing upward at an angle of 72.1 ° with respect to the horizontal. When the plane's altitude is 779 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by alexis on September 15, 2012
  14. physics

    A 54.5-kg skateboarder starts out with a speed of 1.95 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The

    asked by Lola on June 21, 2015
  15. physics

    An airplane with a speed of 80.9 m/s is climbing upward at an angle of 64.5 ° with respect to the horizontal. When the plane's altitude is 795 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by louis on February 6, 2013
  16. Physics

    A bus moves from rest with a uniform acceleration of 2ms for d first 10s. If den accelerates at a uniform rate of 1ms for another 15s . it continues at a constant speed for 70s and finally comes to rest in 20s by uniform acceleration. (A) draw d velocity

    asked by Omolade on March 23, 2018
  17. physics

    An airplane with a speed of 85.1 m/s is climbing upward at an angle of 54.4 ° with respect to the horizontal. When the plane's altitude is 759 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by randy on October 6, 2011
  18. PHYSICS

    A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 23.0 degrees with the horizontal. A piece of luggage having

    asked by Luke on September 21, 2009
  19. Physics

    An airplane with a speed of 85.4 m/s is climbing upward at an angle of 37.6 ° with respect to the horizontal. When the plane's altitude is 520 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by sarah on September 14, 2014
  20. math

    Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. Assume 365 days in a year. (Round your answer to the nearest cent.)

    asked by Anonymous on August 13, 2012
  21. Chemistry

    A 15.0 mL sample of whiskey was diluted to 500.0 mL. A 3.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02400 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with

    asked by Cassie on March 25, 2015
  22. physics

    An airplane with a speed of 88.2 m/s is climbing upward at an angle of 55.6 ° with respect to the horizontal. When the plane's altitude is 523 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by zach on January 27, 2018
  23. Chemistry

    Based on the balanced equation Al2S3 + 6H2O → 2Al(OH)3 + 3H2S calculate the number of excess reagent units remaining when 4 Al2S3 formula units and 30 H2O molecules react? Molar Mass (g/mol) Al2S3 150.16 H2O 18.015 Al(OH)3 75.361 H2S 34.082 Avogadro's

    asked by SIMON on February 20, 2009
  24. Chemistry

    Consider a system consisting of 2moles CO2 gas initially at 25 deg and 10 atm and confined to a cylinder of cross section 10.0 square centimeter. lt is allowed to expand adiabatically against an external pressure of 1.0 atm until the piston has moved

    asked by Rudo Kanukamwe on June 6, 2015
  25. Chemistry

    N-type silicon (Si) has been produced by doping with phosphorus (P). The charge-carrier population based on electrical conductivity measurments is determined to be 3.091*10^17 carriers/cm3 at room temperature. 1. Calculate the doping level of P (how much P

    asked by Alan on April 25, 2013
  26. Physics

    An airplane with a speed of 82.2 m/s is climbing upward at an angle of 71.6 ° with respect to the horizontal. When the plane's altitude is 772 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by Hannah on October 5, 2015
  27. physics

    An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by jc on February 23, 2011
  28. Physics

    A student spins a 1.2kg rock around above her head horizontally in an experiment which aims to model how satellites orbit the earth. The student counts 3 orbits per second when the string produces an orbit radius of 35cm. (a) Calculate the centripetal

    asked by Alfred on August 31, 2009
  29. ALGEBRA

    Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. Assume 365 days in a year. (Round your answer to the nearest cent.)

    asked by Mike on May 20, 2012
  30. PHYSICAL CHEMISTRY

    COCA-COLA IS CARBONATED BY APPLICATION OF CO2 AT HIGH PRESSURE. CALCULATE THE APPLIED PRESSURE NEEDED TO DISSOLVE 0.144 GRAMS OF CO2 INTO A 591 ML BOTTLE OF COKE. (ASSUME COKE IS SIMPLY H2O, AND THAT SOLUTIONS OF CO2 IN H2O ARE IDEALLY DILUTE.)

    asked by BRITNY911 on November 9, 2006
  31. physics- HELP

    An airplane with a speed of 85.3 m/s is climbing upward at an angle of 45.0 ° with respect to the horizontal. When the plane's altitude is 587 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly

    asked by S on September 19, 2014
  32. chemistry check if my answers are right. drbobzz

    Acetylene gas(c2h2) is used in welding. During one job a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene calculate the following. Equation 2C2H2 + 5O2 ---> 4CO2 + 2H2O A) the mass of oxygen used B) the

    asked by Rose on December 7, 2014
  33. Chemistry

    Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density

    asked by john on November 14, 2016
  34. statistics

    Use the following information to calculate the lower and upper fence: A teacher was interested in how many text messages teenagers got per day. He randomly selected 70 students and asked them how many text messages they received the previous day. The mean

    asked by Gee on September 18, 2012
  35. Chemistry

    Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density

    asked by john on November 15, 2016
  36. Chemistry

    Calcium Fluoride, CaF2, adopts the fluorite lattice, which is described as a face-centered cubic array of Ca2+ ions with F-1 ions with Ca2+ ions in half of the cubic holes. The Radii of Ca2+ and F-1 are 126 and 117 pm, respectively. Calculate the density

    asked by john on November 15, 2016
  37. Chemistry

    a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio of moles of CO2

    asked by Carolyn on March 29, 2011
  38. Chemistry

    a mixture of methane CH4 and ethane C2H6 is stored in a container at 294 mmHg. The gases are burned in air to form CO2 and H2O. If the pressure of CO2 is 346mmHg at the same temp and volume as the original mixture, calculate the ratio of moles of CO2

    asked by Carolyn on March 29, 2011
  39. Physics , static fluids

    A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g,

    asked by Andrea on November 26, 2016
  40. physics

    A cart of mass m = 1.10 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 2.12¡À0.06 m/s and vf = 0.60¡À0.08 m/s. Calculate the following quantities including

    asked by Chen on February 19, 2014
  41. physics

    A weight (with a mass of 71 kg) is suspended from a point near the right-hand end of a uni- form boom with a mass of 51 kg . To support the uniform boom a cable runs from this same point to a wall Vertical Height (m) is 7 Horizontal Distance (m) 6 and by a

    asked by Marti on November 8, 2011
  42. college physics

    A 0.240-kg billiard ball that is moving at 3.00 m/s strikes the bumper of a pool table and bounces straight back at 2.40 m/s (80% of its original speed). The collision lasts 0.0150 s. (a) Calculate the average force exerted on the ball by the bumper. (b)

    asked by Mohanad on March 26, 2014
  43. physics

    A meterstick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter stick released, you grab it with those two fingers. You can calculate your reaction time from the distance the meterstick falls,

    asked by andrea on January 26, 2011
  44. Visual Logic

    Create an amortization schedule to calculate your monthly payments on a car and show the loan balance over time with visual logic? Must include assignment statements, IF statement, loop, array. amount= 20000 interest rate= 2% Pay by= 5 yrs So far i've done

    asked by sunny on July 23, 2015
  45. AP Physics

    While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0 m north, 250 m east, 210 m at an angle 30.0° north of east, and 150 m south. Find the resultant displacement from the cave entrance. I know I have to use

    asked by Annamaria on August 26, 2009
  46. Physics

    A skier wears a jacket filled with goose down that is 15mm thick. Another skier wears a wool sweater that is 7.0mm thick. Both have the same surface area. Assuming the temperature difference between the inner and outer surfaces of each garment is the same,

    asked by Cj on April 13, 2007
  47. physics

    In 1976, the Lockhead SR-17A Blackbird set the record speed for any airplane: 3.53x10^3 km/h. suppose you observe this plane ascending at this speed. For 20.0s, it flies at an angloe of 15.0 degrees above the horizontal, then for another 10.0s its angle of

    asked by jack on October 25, 2011
  48. Physics

    A)a 72 kg man jumps from a window 1.2 m above a sidewalk. the acceleration of gravity is 9.81 m/s2. what is his speed just before his feet strike the pavement? answer in units of m/s B) if the man jumps with his knees and ankles locked, the only cushion

    asked by John on February 3, 2011
  49. Chemistry- Dr.Bob!

    1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those

    asked by Sanaya on January 20, 2016
  50. Excel

    I have to create a payroll document for class using Excel and I am quite confused. Here is the parts that I am confused on. -I have to calculate the number of years the employees have been working for us, I believe the function I need to use is TODAY() but

    asked by Amanda on October 31, 2007
  51. Physics

    At the 18th green of the US Open, Tiger Woods needs to make a 20.5 ft (6.25 m) birdie putt to win the tournament. When he hits the ball, giving it an initial speed of 1.57 m/s, it stops 6.0 ft. (1.83 m) short of the hole. Assume the deceleration caused by

    asked by Tonya on September 15, 2013
  52. physics

    A slab of a thermal insulator with a cross-sectional area of 115 cm2 is 4.00 cm thick. It is made out of red brick with thermal conductivity 0.600 J/s∙m•C°. The temperature difference between opposite faces is 95.0 C°. Calculate the following: (a)

    asked by Alice on July 20, 2013
  53. Trigonometry

    1. sin^2 theta+cos theta=2 (Hint: Use the Pythagorean identity sin^2 theta+cos theta=1 to replace sin^2 theta in the given equation.) I got no solution

    asked by Ryan on March 25, 2016
  54. Algebra

    (need help with checking answers) The height , h, in feet, of a bottle rocket is modeled by: h = -16t^2 + 60t where t is the time in seconds. A. Factor the expression. H = 16t^2 +60 = 4(4t^2 + 15) B. What is the height of the rocket after 2 seconds? H =

    asked by Anonymous on June 14, 2017
  55. chemistry

    calculate the lattice energy of sodium oxide (Na2O) from the following data: Ionization energy of Na(g): 495 kJ/mol Electron affinity of O2 for 2e: 603 kJ/mol Energy to vaporize Na(s): 109 kJ/mol O2(g) bond energy: 499 kJ/mol Energy change for the reaction

    asked by Meeeee on September 14, 2012
  56. PHYSICS

    Leg traction is applied to a patient's leg as shown in the figure below. If the physician has requested a 33 N force to be applied to the leg, and the angle is θ = 60 degrees. what mass m must be used for the object hanging from the massless cable? Image

    asked by Nikita on October 14, 2010
  57. Chem hw!

    1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas

    asked by Teisha on March 11, 2010
  58. Chem hw!

    1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas

    asked by Teisha on March 11, 2010
  59. Chemistry

    seriously, any help would be much appreciated. You conduct another experiment on silver condensation. You add 8.0 g of silver nitrate to 200 mL of pure water. You attach a single 850 mAh AAA battery (at 1.3 V) to the electrochemical cell. You can assume

    asked by kyle on November 18, 2013
  60. Physics

    a pendulum has a bob of 0.20kg and is suspended by a string of negligible mass near the earth's surface. the pendulum is displaced from its equilibrium position by the angle of 8.0 degrees. it passes the equilibrium position 0.50 s after being released.

    asked by secret on May 12, 2010
  61. lens surface

    A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens? Do

    asked by kelly on October 18, 2012
  62. CHEM HELPP!

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What

    asked by Court on April 12, 2010
  63. Java

    I would like to create a class for finding the voltages of 1, 2 or even 4 batteries. The Class can be called BatteryVoltage with a default voltage value of 1.5 (AA Battery) Must allow the user to find the total voltage of batteries when installed as a

    asked by JORDAN on October 28, 2014
  64. Finance (Check Answer plz)

    A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is

    asked by Teresa on March 12, 2008
  65. Math

    consider 2 car loans A) 5.9% APR and 3,000 'cash back' B) 1.9% APR and no cash back both loans are repaid after 5 years pick any car to buy and calculate the total amount owed at the end of 5 yearrs. which loan is better choice. the car i have choosen in

    asked by Yaneth on October 11, 2011
  66. maths

    Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my

    asked by mary on July 18, 2012
  67. Finance

    A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is

    asked by Teresa on March 11, 2008
  68. Economics

    We're looking at the market for cat food. When the price is $10, the quantity sold is 1000 bags. When the price drops 10%, the quantity sold increases 30%. Calculate the price elasticity of demand. (Answer in format X.XX, round to the nearest hundredth.) I

    asked by Lindsay on February 25, 2013
  69. physics

    The small mass m sliding without friction along a looped track is to remain on the track at all times, even at the very top of the loop of radius r. a) In terms of the given quantities, determine the minimum release height h b) If the actual release height

    asked by Emma on November 24, 2012
  70. physics

    As part of a training schedule a weightlifter pushes a heavy metal block along the floor. The lifter applies a force of 850 N downwards on the block at an angle of 65° to the vertical (25° to the horizontal). The weightlifter pushes the block forwards 4

    asked by alex on February 28, 2012
  71. Engineering Science

    The road wheel of a motor vehicle increases speed uniformly from 50 rev/min to 1100 rev/min in 40 seconds.calculate the angular acceleration of the wheel in rad/seconds squared,if the diameter of the wheel is 0.7 meters what is the linear acceleration of a

    asked by KUNDA C ANTHONY on November 6, 2018
  72. BUSINESS IT

    firstly write a program to accept the number of telephone calls made by a customer and the print out the rate in cents. secondly define a structure employee with name, category , salary, tax as a member. read the name category and salary of employee and

    asked by Daisy on July 8, 2014
  73. Finance (Check Answer plz)

    A comp. has issued a bond with the following characteristics: Principal=1000, Time to maturity=20yrs. Coupon Rate=8%, compounded semiannually with semiannual payments. Calculate the value of this bond if the stated interest rate, compounded semiannually is

    asked by Teresa on March 11, 2008
  74. JAVA PROGRAMMING

    NEED HELP! I would like to create a class for finding the voltages of 1, 2 or even 4 batteries. The Class can be called BatteryVoltage with a default voltage value of 1.5 (AA Battery) Must allow the user to find the total voltage of batteries when

    asked by JORDAN on October 25, 2014
  75. Chemistry

    The given actual molarity of sulfuric acid was .08M. How do I calculate the absolute error and percentage error? Your question isn't complete? Did you experimentally measure the molarity? Or was it somthing else? If you measure the value experimentally,

    asked by Katelyn on May 7, 2007
  76. math

    The owner of a pool cleaning business wants to know how much time, on average, his workers spend cleaning a pool. Last week, 7 employees each worked a 6-hour shift. In all, they cleaned 42 pools. Which is the most appropriate unit to calculate a answer to

    asked by Tori on December 8, 2017
  77. programming

    write a java application to calculate the exponent value of a number using the following specification

    asked by Anonymous on April 20, 2012
  78. computer science

    I would like to create a class for finding the voltages of 1, 2 or even 4 batteries. The Class can be called BatteryVoltage with a default voltage value of 1.5 (AA Battery) Must allow the user to find the total voltage of batteries when installed as a

    asked by JORDAN on October 28, 2014
  79. Physics - Potential Difference

    An electron moving in the + x-direction has an initial speed of 3.7*10^6 m/s at the origin. Its speed is reduced to 1.4*10^5 m/s at x = 2cm. Calculate the potential difference between the origin and that point. Which point is at the higher potential? My

    asked by Kid on February 15, 2017
  80. Calculating Chi Squared

    I did a biology experiment and I have to use the chi^2 method to calculate statistical significance. I got data at different time points and I just want to make sure what I'm calculating this right. The data I got for one time point are 6 and 23 I know the

    asked by Catherine on October 28, 2011
  81. Java

    NEED HELP! I would like to create a class for finding the voltages of 1, 2 or even 4 batteries. The Class can be called BatteryVoltage with a default voltage value of 1.5 (AA Battery) Must allow the user to find the total voltage of batteries when

    asked by Jordan on October 26, 2014
  82. chemistry

    Liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 3.45 g of hexane is mixed with 16.3 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be

    asked by Emma on December 6, 2011
  83. AP Chemistry

    Given that the specific heat capacities of ice and steam are 2.06 J/g · ◦C and 2.03 J/g·◦C, respectively, calculate the total quantity of heat necessary to melt 19.2 g of ice at −50.0◦C and heat it to steam at 200◦C. The molar heats of fusion

    asked by Rachel M on September 27, 2016
  84. Chemisrty

    Chlorine gas can be produced in the laboratory by adding concentrated hydrochloric acid to manganese(IV) oxide in the following reaction.. MnO2(s)+ 4HCl(aq)-->MnCl2(aq)+ 2H2O(l)+ Cl2(g) A. Calculate the mass of MnO2 needed to produce 25.0g of Cl2 B. What

    asked by Courtney on April 12, 2010
  85. Calculus

    When a reservoir is created by a dam,50 fish are introduced into the reservoir ,which has an estimated carrying capacity of 8000 fish. A logistic model of the population is P(t)= 400,000 / 50 + 795e^-0.5t , where t is measured in years. How long does it

    asked by Dash on April 5, 2014
  86. physics

    A m = 2.51 kg mass starts from rest and slides a distance d down a frictionless theta = 34.6° incline. While sliding, it comes into contact with an unstressed spring of negligible mass. The mass slides an additional 0.220 m as it is brought momentarily to

    asked by Anonymous on October 31, 2009
  87. Physics

    Suppose 2100 J of heat are added to 3.3 mol of argon gas at a constant pressure of 120 kPa. (Assume that the argon can be treated as an ideal monatomic gas.) A) Find the change in internal energy. B) Find the change in temperature for this gas. C)Calculate

    asked by sarah on April 17, 2015
  88. accounting

    Can somebody help me figure out how to calculate the profit or loss on 12,000 bags and 25,000 bags in this problem? The problem is Healthy Foods, Inc., sells 50-pounds of grapes to the military for $10 a bag. The fixed costs of this operation are $80,000,

    asked by AMW on June 15, 2009
  89. Math: Intersections of 3 Planes

    For what value of "k" will the following set of planes intersect in a line? x - 2y - z = 0 x + 9y - 5z = 0 kx - y + z = 0 Work: Elimination to find "z": x - 2y - z = 0 x + 9y - 5z = 0 ------------------ -11y + 4z = 0 z = 11y/4 Sub "z" into "x - 2y - z = 0"

    asked by Anonymous on March 27, 2008
  90. Chemistry

    3Ca(NO3)2(aq)+2Na3PO4(aq)->Ca3(PO4)2(s)+6NaNO3(aq) (a) the grams of Ca3(PO4)2 that can be obtained from 126 mL of 0.750 M Ca(NO3)2 (b) the volume of 0.10 M Na3PO4 needed to react with 13 mL of 0.30 M Ca3(NO3)2 (c) the molarity (M) of the Ca(NO3)2 solution

    asked by Sam on May 1, 2011
  91. Chemistry II

    When a specific amount of propanol (C3H8O) is added to 110.0 g of pure water at 60°C, the vapor pressure of water over the solution is lowered by 1.596 kPa. Given the vapor pressure of water at 60°C is 19.932 kPa, what is the mass of propanol added?

    asked by Jamie on January 16, 2018
  92. chem

    A solution prepared by dissolving 3.00 grams of ascorbic acid (vitamin C, C6H8O6), in 50.0 grams of acetic acid has a freezing point that is depressed by T = 1.33 oC below that of pure acetic acid. What is the value of the molar freezing point-depression

    asked by Ace on February 18, 2013
  93. algebra

    i need help with these problems (either a solution or how to plug them into a graphing calculator): 1) Solve by substitution or elimination 4/x + 1/y + 2/z = 4 2/x + 3/y - 1/z = 1 1/x + 1/y + 1/z = 4 2)Solve the system of equations by substitution. x^2 +

    asked by Alyssa on April 5, 2011
  94. math

    solve for x without using a calculator 5^(x+1) = 25 i know that x would equal 1 because 5^2 is 25, but i don't know how to show how to solve it All you need to do is what you just did: Explain that if x = 1, the equation is satisfied. If you are looking

    asked by Anonymous on July 14, 2007
  95. dilution

    Many labs keep bottles of 3.0M solutions of the common acid on hand. Given the following molarities of the concentrated acids, determine how many mL of each concentrated acid would be required to prepare 225mL of a 3.00M solution of the acid Acid: HCl

    asked by Chopsticks on April 30, 2009
  96. Algebra 116 A

    solve and graph 2x+9 greater or equal to 5 and 2x-13 greater or equal to -9 the solution is {x x greater or equal to ?} What is the ? help

    asked by katie on September 23, 2011
  97. Chemistry

    The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2+ (aq, 0.100 M)||Zn2+ (aq, ____ M)|Zn(s) is 24.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode. Hi, I posted this question awhile back but I think it

    asked by Katherine on June 7, 2012
  98. chemistry

    A compressed gas cylinder of H2 containing 25 l at 200,000 kPa of pressure is emptied due a leak in a gas chromatography laboratory, with the following dimensions: 5 m long, 4 meters wide and 2.5 m height. Calculate the % oxygen and hydrogen in the

    asked by Uwaoma on June 27, 2012
  99. Survey of the Sciences

    Thank you Damon! now, here's the last part of that along with the first again.... Calculate the height from which a block of ice at zero degrees celcius nust be dropped for it to completely melt upon impact. Assume that there is no air resistance and that

    asked by Stephanie on February 2, 2011
  100. mechanics of materials

    A mild steel bar of width 10mm is subjected to a tensile stress of 3,0x105 Pa. Given that Young’s modulus for mild steel is 200 GPa and Poisson’s ration for mild steel is 0.31, calculate the change in width of the bar. Is the width increased or

    asked by dmkp on February 22, 2013

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