1. calculus

    7. A cardboard box manufacturer wishes to make open boxes from rectangular pieces of cardboard with dimensions 40 cm by 60 cm by cutting equal squares from the four corners and turning up the sides. Find the length of the side of the cut-out square so that
  2. College Physics

    7 Moles of a gas initially at temperature 300 K is compressed adiabatically from a volume of 1000 cm3 to a volume of 316 cm3.  To the nearest tenth of a kJ what is the work done by the piston? (It is a monatomic ideal gas.) I have W =
  3. Chemistry

    Confused on these, please explain or show work for the answer if you can. :) 1. What is the morality of a water solution that freezes at -0.633°C? 2. What is the freezing point of a solution that contains 1.99 g of a molecular solute of molar mass 58.5
  4. Math

    A ball is thrown straight up from a bridge over a river and falls into the water. The height, h, in meters, of the ball above the water t seconds after being thrown is approximately modeled by the relation h=-5t^2+10t+35. Can you please help me ! Show your
  5. science

    compare table salt with glucose table salt is a strong electrolyte that will completely dissolve in a solution. whereas, glucose is a weak electrolyte and won't dissolve in a solution. ex. NaCl in water makes Na+ and Cl- ions glucose in water is basically
  6. Physics(Please check)

    An experiment was done where a tiny steel ball was measured with a micrometer. I know I already posted a question about this before and was given a respond but after trying to fix my answers I am still lost. If someone could please review my results and
  7. Biology

    Respond to this question: "If a plant doesn't have enough water to openits guard cells, how would this affect its rate of transpiration?" In your answer, discuss the following: - the guard cell's role in transpiration - what effect this would have on the
  8. math steve for your help

    25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculate the percentage of fes047h20 in the sample
  9. algebra 2

    AN empty 5-gal water jug weighs 0.75lb. With 3 c of water inside, the jug weighs 2.25 lb. Predict the weight of the jug with 5 c of water inside.
  10. LA

    The rusty spigot sputters, utters a splutter, spatters a smattering of drops, gashes wider; slash, splatters, scatters, spurts, finally stops sputtering and plash! gushes rushes splashes clear water dashes 2. What is happening in “Onomatopoeia”? A. A
  11. Calculus help!

    f(x)=e^x for 0<x<2. Imagine that you have graphed this function in the x-y plane. For each value of x in the domain, erect a square above the curve perpendicular to the x-axis and parallel to the y-z plane where one side runs from the x-axis to the
  12. Chemistry

    The question has been answered years ago but not how it is solved. I tried the combined gas law. Here is the question: A balloon originally had a volume of 4.39 L at 44 degrees celsius and a pressure of 729 torr. The balloon must be cooled ??? to reduce
  13. Science

    A gas filled balloon having a volume of 3.0 L at 1.1 atmosphere of pressure and a temperature of 22 C is allowed to rise into the stratosphere where the temperature and pressure are: - 28 C (note the negative sign) and 0.002 atmospheres , respectively.
  14. Chemical

    How i make a graphic about Pressure v/s 1/Volume? Make a table with two colums. Column 1 contains Pressure. Column 2 contains volume. P   1/V ------------------ Then place values of P and 1/V. Then plot those numbers. I can't draw it on the
  15. digital literacy

    what is an search engine? A-a website that searches specific information on the world wide web. B-a piece of hard ware that allows your computer to search for information. C-an external device that keeps your computer running. d-an piece of software that
  16. Waves

    a long fishing rod is kept upright .A boat engine causes the rod to vibrate.Mary speculates that the end of the rod moves to and fro 20 times in 1 minute.The amplitude of the vibrtion is 0.15m.Calculate the speed of the vibration at the end of the fishing
  17. thermodynamics

    A scuba tank contains 1.5 kg. of air. The air in the tank is initially at 15 degree celcius. The tank is left near an engine exhaust line, and the tank's pressure doubles. Determine the final temperature, change of internal energy, change of enthalpy, and
  18. Physics

    A 360 g model rocket is on a cart that is rolling to the right at a speed of 2.5 m/s. The rocket engine, when it is fired, exerts an 8.5 N thrust on the rocket. Your goal is to have the rocket pass through a small horizontal hoop that is 20 m above the
  19. Physics, tempreture

    A rock of mass 0.234 kg falls from rest from a height of 28.9 m into a pail containing 0.492 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1840 J/kg C°. Ignore the heat absorbed by the pail
  20. Math (Grade 9)

    A submarine travels 16km/h on the surface of the water and 10km/h under water. The sub covers 138km in 12 hours. I) Write 2 equations to represent; (Define Variables) total number of hours: Total distance travelled. II) Use equations to calculate the spent
  21. science PLEASE!

    Remember, the treadmil is a machine. What is the inpput force exerted by the man inside the whill?? what is the output force exerted upon the water rising from the well? waht is the mechanical advantage of this machine? the man wt is 75kg. he raises his
  22. math

    a tank and a pail contain a total of 5,136 milliliters of water. jacob pours 314 milliliters of waster from the pail into the tank. the amount of water in the tank is now 7 times what is left in the pail. how much water was in the pail at first?
  23. Math

    A teacher gare an open pot which can cantain only 2liter of water to student and told to bring 3 liter of water from the market.how will that student bring 3 liter water in a pot whose capcity is only 2 liter?
  24. Algebra 1

    1. A chemistry student needs to make a solution that is 70% water and 30% hydrochloric acid. The student's current mixture of 300 ml is 60% water and 40% hydrochloric acid. How much water must the student add to achieve his desired solution? A: ? 2. 5. 2/t
  25. science

    sally had 20g of water and it started at a temperature of 26 degrees celsius and sally cooled it to 22 degrees celsius. a)how much did the temperature of water change? (show work) B) how many calories did sally's water lose?
  26. Algebra

    Noelle bought some boxes of water bottles for a picnic. Each box contained 24 bottles of water. If c is he number of boxes, write an expression to show home many bottles of water Noelle bought.
  27. Physics

    Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.41 m/s at 44.1° above the
  28. chemistry

    50ml of water at 46.9 C were mixed with 50ml of water at 25.1 C in a calorimeter also at 25.1 C. The final temperature was 30.1 C Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat
  29. science

    From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest
  30. AP Chemistry

    From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest
  31. Science

    Can you tell me the Main Idea(s)? There’s an old saying that oil and water don’t mix. But sometimes they do — especially when a chemical called a surfactant brings the two together. Once blended, oil and water become tough to pull apart. Unless, that
  32. chemistry

    a sample consisting 22.7g of a nongasous unstable compound X is placed inside a metal cylinder with a radius of 8Cm and a piston is carefully placed on the surface of the compound so that for all practical purposes the distance between the bottom of the
  33. Science

    1) Instead of using the word "random",is it acceptable to say particles in a liquid move about in "different" directions? 2) Why does ice have a higher density than water vapour? Is it because ice has a greater mass in a fixed volume? 3) The statement
  34. Algebra 2

    Evaluate with nth Roots. For mammals, the lung volume V ( in milliliters) can be modeled by V=170m^4/5 where m is the body mass ( in kilograms)/ Find the lung volume of each mammal. Mongoose - Body Mass(kg) = 1.14 Camel - Body Mass (kg) = 229
  35. Chemistry

    A chemical reaction occurring in a cylinder equipped with a movable piston produces 0.58 mol of a gaseous product. If the cylinder contained 0.11 mol of gas before the reaction and had an initial volume of 2.1 L, what was it's volume after the reaction. Am
  36. Chemistry

    Question: A volume of 26.00ml of 4.30 M. HCL is mixed with 33.70 ml of 10.80 M H3PO4 s mixture is diluted to 1.00 liter with distilled water. A 50.00 ml portion of this diluted mixture is than titrated with .2200 M. NaOH. a) compute the concentration of
  37. chemistry

    What is the purpose of adding zinc chloride in the preparation of starch iodide paste? Please refer to the procedure below: - Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of
  38. Chemistry

    What is the purpose of adding zinc chloride in the preparation of starch iodide paste? Please refer to the procedure below: - Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of
  39. Chemistry-please help

    What is the purpose of adding zinc chloride in the preparation of starch iodide paste? Please refer to the procedure below: - Starch Iodide Paste- Heat 100mL of water in a 250mL beaker to boiling, add a solution of 0.75g of potassium iodide in 5mL of
  40. 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?
  41. science

    spent steam from an electric generating plant leaves the turbines at 120.0 C and is cooled to 90. 0 C liquid water by water from a cooling tower in a heat exchanger. How much heat is removed by the cooling tower water for each kg of spent steam?
  42. physics

    A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.8 m beyond the end of the board. Considering the diver as a particle, determine the following. (a) her initial velocity, v0 1 m/s 2° 3 (b) the maximum height
  43. Differential Calculus

    From a faucet, a constant inflow of water is to fill a conical vessel 15 feet deep and 7.5 feet in diameter at the top. water is rising at the rate of 2 feet per minute when the water is 4 feet deep. what is the rate of inflow in ft^3/min?
  44. science

    When 10grams of sodium chloride, NaCL,dissolves in 100grams of water, the freezing point of the water gose down to -5.9C. when 10grams of table sugar C H O, dissolves in 100grams of water, the freezing point only goes down to - 0.56C. how do yo0u account
  45. cal

    A conical tank (with vertex down) is 12 feet across the top and 18 feet deep. If water is flowing into the tank at a rate of 18 cubic feet per minute, find the rate of change of the depth of the water when the water is 10 feet deep. I got 81/200pi ft/min.
  46. Algebra

    I need help with this problem and to see if I'm doing it right: For the table, identify the independent and dependent variables, Represent the relationship using words, an equation and a graph. # of cases of | # of bottles bottled | of water, b water, c |
  47. chemistry

    What will be the final temperature of the water in an insulated container as the result of passing 5.00 g of steam [H2O(g)] at 100.0°C into 195.0 g of water at 20.0°C? (?H°vap = 40.6 kJ/mol H2O) The best way to do these problems is to make the heat
  48. Physics

    A car has a unibody-type frame and is supported by four suspension springs, each with a force constant of 36100 N/m. The combined mass of the car’s frame and everything inside it (the engine, the seats, the passengers, etc.) is 1270 kg. Because of
  49. Chemistry--Quick Question

    Which of the following are LAWS according to the Scientific Method? It is possible for more than one answer. a. The volume of a gas is inversely proportional to its pressure. b. A solid has a mass of 100.0 grams and a volume of 11.1 mL. c. When a piece of
  50. science

    a large fiberglass tank was placed in a pit, before pipes could be attached and the tank filled with gasoline, the workers were asked to move the tank to another location. which of the following suggestions would be the best way to raise the tank off the
  51. Chemistry

    The calcium in a 150 mL sample of water from the Ogeechee River at a location near Savannah was determined by precipitating Ca2+ as CaC2O4.H2O (FW=146.115 g/mol). The precipitate was collected by filtration, washed and then ignited [turning the CaC2O4.H2O
  52. physics

    A volume of 140 cm3 of an ideal gas has an initial temperature of 20°C and an initial pressure of 1 atm. What is the final pressure if the volume is reduced to 120 cm3 and the temperature is raised to 40°C?
  53. geometry

    A cylindrical beaker has a height of 5 inches and a volume of 63 cubic inches. A scientist pours a chemical from the beaker to a similar beaker with a height that is 100% greater. What is the volume of the larger beaker?
  54. Physics

    A certain amount of gas has a volume of 4000cm^3 at a temperature of 27 degree celsius and a pressure of 1.2 atmospheres. If the pressure is kept constant, find the volume of the gas if it is heated to 60 degree celsius. Please tell me what formula should
  55. Chemistry

    Calculate the pH of a solute where 24.5 mL of 0.1 mol/L HCl is added to 25.0 mL of 0.1 mol/L NaOH. How much excess OH is there? .5ml .1M or 5E-5 moles. That is in a volume of 49.5ml So if OH concentration is that moles/volume, what is the H+ concentration?
  56. math/algebra

    The surface area of a rectangular prism is SA=2lw+2wh+2lh. The volume of a rectangular prism is V=lwh. Write an expression for the ration of surface area to volume.
  57. Math

    Brice found the volume of a box by filling the box with 1-inch blocks. Which unit of measure did Brice use to find the volume? A. Inch B. Square Inch C. Cubic Inch D. Centimeter C?
  58. Math - Steve

    Calculate the volume of the figure. The figure is a box with measurements of base 3 cm...length 3 cm height 3 cm and then there is a pyramid on top of the box - perfect fit... but the height of the pyramid is 2 cm. is the volume 33 cm^3? Thank you
  59. Physical Science

    A loaf of bread (volume 3200 cm3) with a density of 0.50 g/cm3 is crushed in the bottom of the grocery bag into a volume of 2400 cm3. What is the density of the mashed bread in g/cm3
  60. health

    wat are the 6 nutrients? i need facts about them please help!!!!! carbohydrates, proteins, fats, water, vitamins, minerals thanks i need facts about these nutrients i really need help... :( Thank you for using the Jiskha Homework Help Forum. It is
  61. Physics

    An automobile is brought to a stop by applying friction brakes to the wheels. The brakes get hot; their thermal energy is increased. The decrease in kinetic of the car is equal to the increase in thermal energy of the brakes. According to the first law of
  62. Chemistry

    The experimentally measured and generally accepted value for the molar volume of Na is about 23 cm3/mol. Which of the following best explains why the value calculated in Part B is significantly smaller than the measured values? Part B Answer 16.3 cm3/mol
  63. Physics review

    In this example, sound waves are created in a tube. The tube is partially filled with water and the level of water is adjusted in the tube until there is a standing wave. Draw the lowest frequency standing wave for the two water levels in the drawing. The
  64. English

    Swimming Strokes by Lee Carroll Paragraph 4: One of the most easiest strokes for people who are just learning to swim are the backstroke because the swimmer does not put their faces in the water. Your nose and mouth stay above the water, and they can
  65. physics

    A pelican flying along a horizontal path drops a fish from a height of 6.0 m. The fish travels 7.7 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2. If the
  66. calculus

    A trough is 9 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x4 from x=−1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty the trough
  67. chemistry

    A sample of gas with a volume of 2.0 L exerts a pressure of 1.0 atm. If the volume is changed to 1.0 L (at constant temperature), what is the pressure? a. 0.5 atm b. 1.0 atm c. 2.0 atm d. 4.0 atm
  68. Chemistry

    Container A contains argon gas at 0C and pressure 380mmHg. Container B of volume 700 ml contains neon gas at 25C and pressure of 3atm. Both of these gases are placed in a 2L vessel at 273K and the total pressure is 1.46atm. What is the volume of container
  69. ALGEBRA

    Using x as the variable, write the equation or inequality that would correctly solve this problem. Kevin took his car to Dwain's Automotive to have the engine replaced. Kevin was told that at the most, the total bill for parts and labor would be $6,300.
  70. Physics

    Calculate the specific heat capacity of substance x from the following data. A container made of the substance x has a mass of 3.6kg and contains 14kg of water. A 1.8kg-piece of the substance x initially at the temperature of 180°C is dropped into the
  71. Chemistry

    I am having trouble with this question: A byproduct is chloroform (CHCL3) , a suspected carcinogen produced when HOCL, formed by the reaction of CL2 and water, reacts with dissolved organic matter. If a solution consist of 100 ppb of CHCL3 in drinking
  72. Science grade 3

    I know that fresh water will freeze faster than salt water but I need to fill in a table. The table shows some variables which are the amount of water and the amount of salet. I need to write how I would control each variable and I do not quite understand
  73. Physics

    One more please, I cant figure out the equations. Boats generally have a hard time traveling faster than their hull speed, which is thespeed of a water wave that has the same wavelength as the boat length? (a) What is the hull speed for a 5 meter canoe in
  74. Calculus

    a pond that lies in a crater is being drained at the rate of 1000m3/min.If the crater has the shape of an inverted cone of radius 200(at he original water level) and original depth is 50 m (at the center) find that rate at which the water level begins to
  75. Physics

    In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam
  76. Art

    Please help! I have never posted a question before. But I need help with this question: How should you properly care for your brushes? A. Wash them thoroughly and store them with the bristles up B. Rinse them in hot water and rub dry between two paper
  77. living environment

    WHY IS THE DIFFERENCE BETWEEN PHOTOSYNTHESIS AND RESPIRATION DECSCRIBED AS A CYCLE? chemically, they are reverse processes: photosynthesis makes organic molecules and oxygen water from carbon dioxide and water. Respiration takes in oxygen and then "burns"
  78. Physics

    In a physics experiment, 250g of water is placed in a 50g calorimeter cup made of aluminum when both are at 15C. Steam at 100C is completely absorbed by passing it through the water, raising the temperature of water and cup to 45C. Find the mass of steam
  79. Physics

    A rock of mass 0.234 kg falls from rest from a height of 28.9 m into a pail containing 0.492 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1840 J/kg C°. Ignore the heat absorbed by the pail
  80. chemistry

    i keep trying to do these problems and i don't understand them. please help me!! 1. Gas stored in a tank at 273 K has a pressure of 388 kPa. The save limit for the pressure is 825 kPa. At what temperature will the gas reach this pressure? A. 850 K B. 925 K
  81. Chemistry

    A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the
  82. Chemistry

    A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the
  83. Chemistry

    A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the
  84. Chemistry

    A piece of copper metal is initially at 100 C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20 C. After stirring, the final temperature of both copper and water is 25 C Assuming no heat losses, and that the
  85. Geometry

    The ratio of the volume of Cylinder A to the volume of Cylinder B is 1:5. Cylinder A is similar to Cylinder C with a scale factor of 1:2 and Cylinder B is similar to Cylinder D with a scale factor of 1:3. What is the ratio of the volume of Cylinder C to
  86. science

    when the oxide of arsenic is heated it sublimes and becomes a gas. at 650oc and a pressure of 690mmHg the 0.927g sample of the oxide has a volume of 194cm3. calculate the volume,in cm3, that the sample would have at the same temperture (650oc) but at a
  87. CALC -- integrals!

    2. f(x)=e^x for 0<x<2. Imagine that you have graphed this function in the x-y plane. For each value of x in the domain, erect a square above the curve perpendicular to the x-axis and parallel to the y-z plane where one side runs from the x-axis to
  88. Solar Energy Please Help

    a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,
  89. production and operations management

    5. All of the following statements about ABC analysis are true except: A. Inventory may be categorized by measures other than dollar volume B. It categorizes on-hand inventory into 3 groups based on dollar volume C. It is an application of the Pareto
  90. Physics

    A 66.0 kg diver is on a diving board, which is 1.10 m above the water. He falls at a speed of 9.10 m/s. Calculate his kinetic energy as he hits the water. I know KE is 1/2mv^2, but how can I find KE when height is involved?
  91. science

    Which pair of substances would likely neutralize each other? A) lye and amonia B) vinegar and battery acid C) ammonia and calcium carbonate D) distilled water and rain water
  92. Bridgeway Academy

    Math A fish aquarium has a capacity of 2 gallons of. If it was already filled with two quarts plus one pint of water, how much water would need to be added to completely fill the tank?
  93. CHEM

    If the heat from burning 5.800 g of C6H6 is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542
  94. Chemistry

    A 43 sample of water absorbs 302 of heat. If the water was initially at 29.8, what is its final temperature? i been trying to solve this problem all day long, but i just don't understand how to do it. please help me. thanks..
  95. Chemistry

    If the heat from burning 5.800 g of C6H6 is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542
  96. Chemistry

    A chunk of 0 C ice, mass 145g, is dropped into 75g of water at 62 C. The heat of the fusion of water is 335J/g. What is the result after thermal equlibrium is attained?
  97. Physics

    Water emerges vertically from a hose at ground level and rises to a height of 3.2 m. (a) At what speed does the water emerge from the nozzle? (b) How long is a given drop in the air?
  98. Chemistry

    Which of the following products are insoluble in water? a. AgC(2)H(3)0(2) b. MgSO(4) c.Pb(NO3)2 d.Hg(2)CO(3) e.Ca(OH)2 Try looking up the Material Safety Data Sheet for each using google. A useful tip is that all nitrates are soluble in water.
  99. Chemistry

    Water is sprayed on oranges during a frosty night. If an average of 11.8 g of water freezes on each orange how much heat is released. Can you please help me set this problem up. I don know what formula to use? thank you
  100. Science

    Can someone please help me solve this homework problem for my chemistry class.Thanks A 4.0*10^1kg sample of water absorbs 308KJ of heat. If the water was initially at 25.5 C, what is its final temperature?