1. Maths

    As water drains out of a 2000L hot tub, the amount of water remaining in the tub can be modelled by the function V=0.00002(100-t)^4 , where t is the time, in minutes (t is greater than or equal to 0 and less than or equal to 100), and V is the volume of water, in litres, ...
  2. Chemistry

    Consider 54.0 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.200. What volume of water must be added to make the pH = 5.500? I found HA for both and then I used C1V1 = C2V2 plugging in the concentrations of HA in C1 and C2 and 0.054 for V1, but I'm ...
  3. chemistry

    A gas tank holds 15.0 liters of gas at 37C and 342 kPa. What volume would this gas occupy at STP?
  4. chemistry

    A gas tank holds 15.0 liters of gas at 37C and 342 kPa. What volume would this gas occupy at STP?
  5. Chemistry

    At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction <- 2CO2(g) -> 2CO(g) + O2(g) is about 1*10E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equilibrium with ...
  6. Chemistry

    At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)⇄2CO(g) + O2(g) is about 1*E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equilibrium with respect to ...
  7. history

    What is the significance of Alexander Hamilton's financial program? How did Hamilton's financial program play a role in the creation of a two-party political system? My response to the first was that he wanted to increase the nations finances and to make sure there would be ...
  8. statistics

    The general manager for Gordon's Self Service Gasoline is interested in estimating the mean number of gallons of gasoline that are purchased by customers at their Philadelphia location. He would like his estimate to be within plus or minus 0.50 gallons, and he would like the ...
  9. gen chem

    What is the boiling point in K of Zn, if the entropy change for evaporation of .8564 mole at its boiling ponit is 95.067K? The heat of vaporization of Zn is 131jk/mole.
  10. 11th grade

    volatile liquids with lower boiling points give better results than those with higher boiling points. suggest a reason for this.
  11. Chemistry

    The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at the top of Pikes Peak where P=260 mmHg?
  12. Thermodynamics

    Consider a system consisting of two glass bulbs, each with volume V, and each containing n moles of gas. Bulb A contains nA moles of A and bulb B contains nB moles of B (a different gas), nA = nB. The bulbs are connected by a closed stopcock. The stopcock is opened so that the...
  13. Help...Math...Algebra...please!...

    Two cars leave town going in the same direction. One travels 55 mph and the other travels 65 mph How long will it take before they are 180 miles apart? Hint: We do know that one car is 180 miles ahead of the other, so the slow car's distance can be represented by " d " and the...
  14. Physics

    Consider the rods plus disc system shown in the Figure. The rod has a length L =0.50 m, and mass M = 0.270kg. The large disc has a radius of R = 0.130m and mass m=0.810kg. The second disk should be treated as a point mass of 0.405kg. It is glued to the rod at position X = 0....
  15. Science--3 questions? :c

    15. The___hypothesis suggests that our solar system evolved from a huge rotating cloud of dust and gas. 16. Lines of____are used to measure distances east or west of the prime meridian in degrees. 17. The major difference between a topographic map and other maps is that a ...
  16. Chemistry

    A solvent has a molar mass of 37.2 g/mol and a normal boiling point of 111.2 oC. The boiling point elevation constant, K b , for this solvent is 1.58 oC/m. If 18.7 g of a nonelectrolyte having a molar mass of 20.5 g/mol are mixed with 170.0 g of the solvent, what is the ...
  17. Math

    Grace ddrove 159 miles and used 5 3/10 gallons of gas. How far could she go with one gallon of gas?
  18. chemistry

    A mass of 7 kg of water is raised from 8 degrees C to the boiling point 100 degrees C. How much heat is required? The specific heat of water is 1000 cal/kg · degrees C. Answer in units of cal
  19. Chemistry Help

    Which of the following exhibits the highest boiling point? HF, HCl, HBr, or HI Which of the following exhibits the highest boiling point? CH3CH3, CH3COOH, or CH3OCH3 How can you determine the highest boiling point of these?
  20. Physics

    An automobile accelerates 1.77 m/s2 over 6.00 s to reach freeway speed at the end of the entrance ramp. If the car's final velocity is 24.44 m/s, what is it's initial speed when it began accelerating. the answer i got was 35.06 m/s (35.1 m/s when doing sig figs). I didn't no ...
  21. Science

    What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property Ab object weighing 90 N has ...
  22. math

    Write a proportion that is equivalent to the statement: If 3 gallons of gasoline cost $5.37, then 8 gallons will cost $14.32. On this one I have know idea how to perform this equation looked for examples no luck can someone help please
  23. Pre Calc

    1. Describe the linear programming situation for this system of inequalities. x<(or equal too)1 y>(or equal too)0 3x + y<(or equal too)5 2. Describe the linear programming situation for this system of inequalities where you are asked to find the maximum value of f(x, ...
  24. Chemistry

    We're doing a spontentaity lab in chemistry and I wanted to make sure I was using the right equation to do the questions! Could someone make sure this is right?? q system = - (q water - q calorimeter)
  25. PHYSICS

    COULD YOU FURTHER EXPLAIN HOW MANY BTU ARE REQUIRED TO RAISE THE TEMP OF500 GALLONS OF WATER FROM 70 DEGRESS TO 160 DEGREES FAHRENHIET
  26. Social Studies

    What was the most likely cause of the dust bowl? a. Intense wind storms from changing weather patterns b. extreme heat evaporating the small water supply in the region c. an overpopulation of livestock causing stress on the food system d. overplowing the land without periods ...
  27. Chemistry

    Arrange the compounds in order of increasing boiling point. A) CH4 B)CH3CH3 C) CH3CH2Cl D) CH3CH2OH **I know High Intermolecular force = High boiling point!** My question is if A, B & C are dipole-dipole, and D is hydrogen bonding.. how can i determine from A, B & C which is ...
  28. Physics

    A 28.0kg block is connected to an empty 1.80kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.41 and the coefficient of kinetic friction between the table and the block is 0.35. Sand is gradually ...
  29. Math

    If a car averages about 22 1/2 miles per gallon , and the capacity of the tank is 16 1/4 gallons, how many miles would be expected on a tank of gas?
  30. Math

    If a car averages about 22 1/2 miles per gallon , and the capacity of the tank is 16 1/4 gallons, how many miles would be expected on a tank of gas?
  31. Climate

    Which of the following statements about climate is FALSE? A. Deserts usually occur at very low altitudes. B. Temperatures usually decrease with altitude. C. Coastal temperatures are usually cooler than inland temperatures. D. The southern hemisphere is warmer than the northern...
  32. English

    1. water closet [Longman Dictionary] noun [ C usually singular ] uk ​ /ˈwɔː.tə ˌklɒz.ɪt/ us ​ /ˈwɑː.t̬ɚ ˌklɑː.zɪt/ [old-fashioned] a toilet 2. water closet [Cambridge Dictionary​ full form of WC: a toilet, or a room containing a toilet...
  33. graphing linear non proportional relationships usi

    the equation y=-0.04×+ 12 gives the number of gallons of gad in your car, where × is the number of miles driven. Graph the equaton. Interpret the slope and y-inercept of the line
  34. Chemistry

    A solution is prepared by placing 72.8 g of calcium chloride in 120 g of water at 22C. The vapor pressure of water at 22C is 2.6 kPa. a)What is the boiling point of the solution? b)What is the freezing point of the solution?
  35. chem

    A balloon holds 29.3 kg of helium. What is the volume of the balloon if the final pressure is 1.2 atm and the temperature is 22°C? using the equation pv=nrt would i put 29.3 kg in place of n? but n has to be in moles so how do you convert that? thanks
  36. physics

    18)An airplane has to fly eastward to a destination 856 km away. If wind is blowing at 18.0 m/s northward and the air speed of the plane is 161 m/s, in what direction should the plane head to reach its destination? 6.42 degrees south of east 19)A 4400 kg can accelerate from 0-...
  37. Math

    Write two equations that have your two integers as solutions. Show how you built the equations using your integers, numbers used 5 and 8. Solve your system of equations by the addition/subtraction method. Make sure you show the necessary 5 steps.
  38. physics

    The pulley system in Figure 6-25 is used to lift a crate of mass m = 41 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible.
  39. Direct way to improve yield of ball mill

    The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided Grate Ball Mill and ...
  40. business

    Assume that you are part of the management team of Nordstrom’s department store. The retail industry and Nordstrom’s is under a great deal of pressure due to the state of the economy. Research the retail clothing industry and Nordstrom’s in particular using an online ...
  41. math

    If you can drive your car 540 miles on 26 2/3 gallons of gasoline, how many miles can you drive on one gallon?
  42. math

    7. If you can drive your car 540 miles on 26 2/3 gallons of gasoline, how many miles can you drive on one gallon?
  43. Calculus

    The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. ---------- What is shown is just the tank (a hemisphere) with a radius of 5 ft. ---------- First I calculated the Volume of the ...
  44. Chemistry (Check)

    Completion 1)Metric 2)Five 3)Meter 4) 5)Weight The International System of Units (SI) is a revision of the ___1____ system. There are __2____ SI base units. In SI, the base unit of length is the ___3____. The Space taken up by a cube that is 10cm on each edge is one __4___. A ...
  45. PHYSICS HELP

    I am having a real problem with this question. Through the process of doing work, energy can move between the external world and the system as the result of forces or work. I say it's forces, but someone else says it's work because only work and energy can be inerchanged. Who ...
  46. Physical Science

    A 28.0kg block is connected to an empty 1.80kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.41 and the coefficient of kinetic friction between the table and the block is 0.35. Sand is gradually ...
  47. managment ethics

    How do we solve this dilemma? Assuming capitalism is based on a mutual system of trust among consumers and producers, employers and employees, is one justified in breaking a contract even if it's in the pursuit of happiness? If we used Kant's Categorical Imperative, wouldn't ...
  48. chem

    A mass of 7 kg of water is raised from 8 degrees C to the boiling point 100 degrees C. How much heat is required? The specific heat of water is 1000 cal/kg · degrees C. Answer in units of cal I got 644000, is that right?
  49. math

    Elimination was used to solve a system of equations. One of the intermediate steps led to the equation 9x=27 . Which of the following systems could have led to this equation? 4x+3y=24 −5x−3y=3 7x−2y=15 x+y=6 9x+2y=21 −9x−2y=21 10x−y=15 x+y...
  50. chemistry

    a 50.0 ml sample of water is heated to its boiling point. how much heat (in KJ) is required to vaporize it? (assume a density of 1.00g/ml).
  51. CHEMSIRTY

    How much energy would it take to warm 30.0 g of water at 35 oC to the boiling point and boil all the liquid away?
  52. chemistry

    what pressure, in atmosphere, is exerted by 0.52 mol of water vapor at its boiling point of 100 degrees celcius in a 3L teakettle?
  53. Chemistry

    Is the equation of the chemical reaction that occurs when you blow your breath through boiling water? CO2 + H2O -> H + HCO3
  54. Chemistry

    What is the boiling point of a solution that contains 1.20 mole of sodium chloride in 1000 g water? KbH2O = 0.512C/ molal
  55. AE

    Teachers need to have skill in using a variety of technologies. Learn to use a technology that you have not used before, or learn a new application of a technology you have used before. Use the technology to develop a teaching product that you might be able to use in student ...
  56. physics

    A room has a volume of 164 m3. An air-conditioning system is to replace the air in this room every 26.8 minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed ...
  57. chemistry

    Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume that the density ...
  58. geometry

    Deshawn built a model train car. The length of the model train car is 6 in. The scale Deshawn used to build the model train car is 1:36. What is the actual length of the train car in FEET?
  59. English

    Which sentence includes an adjectival phrase? a. The American chameleon, a type of lizard, can change colors to blend with the environment. b. The fastest land mammals, cheetahs, reach speeds in excess of 65 miles per hour. c. The length of a person's forearm can often be used...
  60. math

    Joe has $10,000 to purchase a used car. If the sales tax is 7% and the fee for title and license plates is $200, what is the maximum amount Joe can spend for a car?
  61. math

    Joe has $10,000 to purchase a used car. If the sales tax is 7% and the fee for title and license plates is $200, what is the maximum amount Joe can spend for a car?
  62. dynamics

    The free-rolling ramp has a weight of 135 lb The crate whose weight is 72 lb slides from rest at A , 15ft down the ramp to B. The ramps is also at rest when the crate is at A. Assume that the ramp is smooth, and neglect the mass of the wheels. basicall the picture looks like ...
  63. Chemistry

    A 72.2 g ice cube floats in the Arctic Sea. The temperature and pressure of the system and surroundings are at 1 atm and 0°C. Calculate ΔSsys, ΔSsurr, and ΔSuniv for the melting of the ice cube. (The molar heat of fusion of water is 6.01 kJ/mol.)
  64. Chemistry

    (DrBob222 please help me) What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128 J/g◦C. Please explain with the numbers plugged in ...
  65. Physics

    In a physics experiment, Wendy immersed a copper of mass 300g in 100 degree C in boiling water and left it there for several minutes. She then transferred the cube to 0.2 kg of water at 10 degrees C. The final temperature of the mixture was 21 degrees C. What value did she get...
  66. English

    1. When my teacher stopped [making reeds. Sending] all of her students on a wild goose chase. a. no change b. reeds. Thus sending c. reeds, she sent d. reeds, sending 2. They tend to take their time sending reeds to [you. I usually] have to wait a. no change b. you, usually I ...
  67. Science

    Table 1: Temperature and volume data Trial Temperature (Celsius) Volume (mL) Starting Volume Room Temperature = Hot Water Trial 1 107 5.6ml Hot Water Trial 2 108.3 5.4ml Cold Water Trial 1 lo 4.4ml Cold Water Trial 2 lo 4.4ml PLOT AREA (Insert a graph that you either drew here...
  68. Math

    A box that holds an expensive pen has square ends, and its length is 13 cm longer than its width. The volume of the box is 60 cm^3. Determine the dimensions of the box.
  69. Algebra

    An aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars to make each airplane engine) depends on the number of engines made. If x engines are made, then the unit cost is given by the function =Cx+−0.2x248x21,748 . What is the minimum unit cost...
  70. ALGEBRA

    An aircraft factory manufactures airplane engines. The unit cost C (the cost in dollars to make each airplane engine) depends on the number of engines made. If x engines are made, then the unit cost is given by the function =Cx+−0.2x248x21,748 . What is the minimum unit cost...
  71. Algebra

    5) How many solutions does the system of equations have?x-4y=12 and 5x-20y=60 A.one B.two C.infinitely many D.none 6) How many solutions does the system of equations have? y-6x=-3 and 4y-24x=-16 A.one B.two C.infinitely many D.none
  72. physics- pressure/gas

    Suppose 2500 J of heat are added to 4.1 mol of argon gas at a constant pressure of 120 kPa. (Assume that the argon can be treated as an ideal monatomic gas.) Find the change in internal energy. I started using U = N (3/2 kB T). But I have too many unknowns. The only other ...
  73. intro to paralegal

    i have a discussion post that im not quite sure how to answer, since i am unsure how to interpret it. It reads as follows: The American common law system provides the judicial system with two primary duties 1) interpreting the meaning of statutes and regulations, and 2) ...
  74. Algebra 116

    1. The perimeter of a rectangle is 126 m. The length is 6 m more than twice the width. Find the dimension. a. What is the length ____ m? b. What is the width ____ m? 2. Two angles are complementary. The sum of the measure of the first angle and half of the second angle is 72 ...
  75. physical

    At a distance of 30 m the noise from the engine of an jet has an intensity level of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distance in meters), ...
  76. physics

    At a distance of 30 m the noise from the engine of an jet has an intensity level of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distance in meters), ...
  77. Chemistry

    1) how many joules are required for each of the following? A)Heating 55g of water from 12 degree Celsius to 76 degree Celsius B) Melting 12.8g of ice at 0 degree Celsius. c) Boiling 21.1 g of water at 100 degree Celcius
  78. Physics

    Consider the figure below. (Let w1 = 150 N and w2 = 38.0 N.) (a) What is the minimum force of friction required to hold the system of the figure in equilibrium? N (b) What coefficient of static friction between the 150-N block and the table ensures equilibrium? (c) If the ...
  79. chemistry

    600 gallons of 15 M nitric acid were added to a lake. The initial pH of the lake was 5.90 and the final pH was 3.70. What is the volume of the lake?
  80. Chemistry

    320.0 gallons of 15 M nitric acid were added to a lake. The initial pH p the lake was 6.30 and the final pH was 4.60. What is the volume of the lake?
  81. chemistry

    Write the balanced net ionic equation for each of the following: 1) The reaction of dilute nitric acid with solid aluminum oxide. 2) The reaction of nitrous acid (HNO2) with potassium permanganate to produce nitrate and Mn(II) ions. Thanks for any help. How much of this do you...
  82. MATH 4 GRADE

    Josh is watering his plants. He gives each of 2 plants 3/5 pint of water. His watering can holds 1/5 pint. How may times will he fill his watering can to water both plants> show a visual model to solve
  83. physics

    A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?
  84. physics

    A coolant fluid has a latent heat of evaporation of 234 kj/kg . If the pump rate is 2250g per minute. How much thermal heat is removed each hour?
  85. Chemistry

    Muriatic acid is the common name of industrial-grade hydrochloric acid (HCl). One of its uses is to clean or etch concrete in preparation for sealing or painting. It is typically sold in 5.00 gallon buckets, with a concentration of 11.7 M. a.What volume of concentrated ...
  86. MATH

    The LRT trolley system 10 miles long is fed by two substations that generate 600 volts and 560 volts, respectively. the resistance of the trolley wire and rail return is 0.3 ohm per mile. if the car located 4 miles from the 600-volt station draws 200A from the line, how much ...
  87. Algebra 2

    Tickets to the school musical cost $3 for students and $5 for non students. Total ticket sales were $1790. The number of student tickets sold was 100 less than twice the number of non student tickets sold. Write a system of equations to represent this situation. Solve the ...
  88. ict year 8

    i know this question has been asked before but i can`t find the answers on the other sites mentioned before. I need to find the definition of intranet, advanced search , search engine , attachment , groups, html, and hyperlink and also i need to give examples if possible. Also...
  89. math

    In a car repair shop there are 50 cars to be repaired . It is estimated that 23 of that cars need new brakes , and 34 of that cars need to repair the exhaust system . a. How many cars are in need of repair at least two? b . What most cars that are not in need of repair both?
  90. Writing Essay 5th grade

    Hello, I got an assignment writing persuasive essay why we should save water? Could plz check my essay and guide me if I need to change anything. Thank You for your help. Why we should save water. (Persuasive Essay) Have you wondered why we should save water and how we can ...
  91. Physics

    A decibel meter reads 130 dB at a certain position from a jet plane when one engine is turned on. a) What is the sound intensity at that position? b) What would be the sound level at the same position if two engines are turned on each having the same intensity as the first? ...
  92. Physics

    A 1500 kg car is travelling at 20 m/s. It brakes to a stop causing the brake pads to heat up from 25 degrees Celsius to a temperature too hot to touch. The total mass of the pads altogether is 4.0 kg and their heat capacity is 8.9 x 102 J/kg0C. If these pads are removed from ...
  93. southuniversity

    You have been hired as the marketing manager. Research and identify major approaches of how innovations like these are adopted by consumers. Discuss how the marketing strategy for the car needs to rapidly move through these processes. Who or what are the key groups that need ...
  94. physics

    The system shown below consists of a block of mass M = 4.4 kg resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging block of mass m = 1.9 kg. The pulley is a uniform ...
  95. Physics

    In a particular crash test, an automobile of mass 1295 kg collides with a wall and bounces back off the wall. The x components of the initial and final speeds of the automobile are 25 m/s and 1.5 m/s, respectively. If the collision lasts for 0.11 s, find the magnitude of the ...
  96. accounting 201

    I am having trouble figuring out my accounts payable and capital. Any help on going about and solving this would be greatly appreciated. I have listed the data below... Travis Fortney, an architect, opened an office on April 1, 2010. During the month, he completed the ...
  97. English/ Help

    . Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an...
  98. english

    Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an ...
  99. physics

    Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a "crumple zone" in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about...
  100. Physics

    If we examine a ball in free fall, we find that the momentum of the ball is not constant. This is not a violation of the law of conservation of momentum because A) the force of gravity acts on the ball. B) the ball experiences an external force. C) the system is not closed. D...
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