1. Physics

    Lake Erie contains about 4.8 x 10^17 grams of fresh water. Assume that the lake has frozen solid and that the ice starts off at -3 C. How much energy would the lake need to absorb from the Sun to cause it to evaporate completely? Each gram of water will
  2. physics

    A 42.1 kg diver steps off a diving board and drops straight down into the water. The water provides an average net force of resistance of 1559 N to the diver’s fall. If the diver comes to rest 4.1 m below the water’s surface, what is the total distance
  3. College Algebra

    Three bottles of water and 2 bagels cost $8.23. At the same prices, 2 bottles of water and 5 bagels cost $8.64. Find the price per bottle of water and the price per bagel. Work so far: 3x + 2y = 8.23 2x + 5y = 8.64
  4. chemistry

    Is the dissolution of borax in water a temperature dependent reaction or is it spontaneous at all temperatures at which water is liquid? I think its spontaneous at all temperatures when water is liquid because borax is a polar compound.
  5. Chemistry

    A 17.7kg piece of zinc at 73 degrees celsius is placed in a container of water. The water has a mass of 23 kg and has a temperature of 13.4 degrees celsius before the zinc is added. what is the final temperature of water?
  6. geometry

    The water level in a spherical bowl has a diameter of 30cm. If the horizontal diameter of the bowl is 10cm below the water level. calculate the radius of the bowl and the depth of the water in the bowl.
  7. Physics

    A runner weighs 560 N (about 130 lb), and 74% of this weight is water. (a) How many moles of water are in the runner's body? moles (b) How many water molecules (H2O) are there? molecules I was able to get part (a), but I'm not sure how to get part (b)
  8. Chemistry

    If 150 mg of aspirin are rinsed with three portions of 10 mL of water at 25 degrees Celsius, how much aspirin is recovered? Solubility of aspirin in water at 25 degrees Celsius is one gram of aspirin per 300 mL of water.
  9. math

    Water is being poured into a conical cup that is 12cm tall. a) When the water in the cup is 9cm deep, what percentage of the cup is filled? b) When the cup is 75 percent filled, how deep is the water?
  10. physics

    You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 50 km/h (30 mph). A new model of mass 1500 kg takes 0.11 s from the time of impact until it is brought
  11. material science

    A syntactic foam is made by mixing thin-walled hollow glass spheres (radius, r, and wall thickness, t=0.05r) into an epoxy resin, which is then cured and hardened. The glass from which the spheres are made is twice as dense as the hardened resin. If the
  12. Chemistry

    3. suppose a gas at STP. Calculate its pressure at 25 degrees celcius if volume remains unchanged 5. suppose 1.11 L of an unknown gas in a rigid container constant volume is cooled from 22 deg. C to -55 deg C. Calculate the new pressure of the gas 6.)
  13. Science

    My answers are at the bottom. Describe the method you would use to separate eachg mixture. Methods: Picking apart, filtering, using density, using magnetism, dissolving, evaporating. a)sand and water b)oil and water c salt and pepper d)sand and pebbles
  14. PHYSICS HELP PLEASE

    A container is fitted with a movable piston of negligible mass and radius r = 0.061 m. Inside the container is liquid water in equilibrium with its vapor, as the drawing shows. The piston remains stationary with a 120-kg block on top of it. The air
  15. Orgo

    Calculate the approximate boiling point of a mixture of bromobenzene and water at atmospheric pressure. A table of vapor pressure of water and bromobenzene at various temperatures is given. Vapor Pressures (mmHg) Temperature(c) Water Bromobenzene 93 588
  16. English

    Can you please check if the following sentences are correct? I thank you very much in advance. 1) In the morning I usually make coffee for my parents and myself (?). Then I got washed and changed. 2) I usually take the child to the beach.I have to carry a
  17. Chemistry

    When 32.0 mL of 0.560 M H2SO4 is added to 32.0 mL of 1.12 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the
  18. Chemistry

    Calculate the heat released from 61.5 g of steam at 111 degrees C is converted to water at 39 degrees C. Assume the specific heat of water is 4.184 J/g*C, the specific heat of steam is 1.99 J/g*C and the enthalpy.H.vap= 40.79 KJ/mol of water
  19. Chemistry

    Compare the energy needed to raise the temperature of 1kg of water from 20°C to 100°C and the energy needed to boil 1kg of water at 100°C? I turned 1kg to 1000g water is 4.18J/g°C and subtracted 20°C then i get confused as what to do next to
  20. math

    A water tank will be drained at a constant rate of 42.4 liters per hour starting at 9:00 A.M. After one hour, the change in the amount of water in the tank can be represented as –42.4. Which of the following represents the total change in the amount of
  21. apchemistry

    Hi Please double check me: I had to state whether the process forms a voltaic or eletrolytic cell: YOu plug in your MP3 player to charge the nickel-cadmium battery (I said electrolytic)??? The radio plays in your car even though the engine is not running.
  22. Biology

    I am analyzing a scientific article for my biology class. I am trying to comprehend all of the terms used and am hoping I can gain other's insight as to where this article is flawed and what could have been done to improve it. The article is titled: Effect
  23. MATH!

    If the edge of a cube is increased by 50%, then the volume is increased by x%. Find x. PLEASE HELP. THANK YOU. Let Y = edge of a cube. Y + 0.5Y = 1.5Y = new edge of the cube. Then old volume is Y^3 New volume is (1.5Y)^3 = 2.375Y^3. %increase = ([3.375Y^3
  24. math

    A tank contains 4L of water at first. Tap A is turned on and water from tap A flows into the container at the rate of 8L per minute. After 3 minutes, Tap B is turned on. Both taps are turned off together after another 5 minutes. If the total amount of
  25. Chemistry- please help

    I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this test. Do I boil 100ml of
  26. physics

    A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the
  27. physics

    A solid aluminum sphere has a radius of 2.28 m and a temperature of 89.1 °C. The sphere is then completely immersed in a pool of water whose temperature is 11.9 °C. The sphere cools, while the water temperature remains nearly at 11.9 °C, because the
  28. Calculus

    A swimming pool is 60ft long by 25ft wide. Its depth varies uniformly from 3ft at the shallow end to 15ft at the deep end. The pool is being filled with water at a rate of 800ft3/min. There is 5ft of water at the deep end. What is the equation for finding
  29. chemistry

    Three metals, iron, copper, and gold, have heat capacities of 0.450 J/goC, 0.385 J/goC and 0.129 J/goC, respectively. A 10g sample of each metal was heated in a water bath at 100oC. One of these metals will be placed in a Styrofoam cup containing 50.0 mL
  30. Chemistry

    I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this test. Do I boil 100ml of
  31. 9th grade science

    Explain which statement is correct: energy is lost when water is boiled or the energy used to boil water is present, but it is no longer in a usable form unless you use work or heat to make it usable. i think that the 2nd one is correct because i no that
  32. Chemistry/Math

    If a doctor tells you to drink 1 liter of water per day, answer the following questions(assuming the density of water to be 1g/mL): 1. The number of grams of water per day? 2.The number of molecules of oxygen per day? 3. The number of atoms of oxygen per
  33. geometry

    One advantage of the prismoidal formula is that you can use it to a) calculate precise volumes of all prismoids b)calculate both volume and surface area c)determine volumes of figures that are not prismoids d)estimate the volume of solids that are
  34. Physics

    A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^−4 m^3. Estimate the original volume of the gas. I
  35. Chemistry

    As a hot air balloon rises to increasingly higher altitudes describe what happens to the volume of the balloon if at constant pressure? If pressure is constant, and temperature decreases.. PV=nrT Volume is directly proportional to temperature..
  36. chemistry

    A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius What volume would this occupy at 26 degrees Celsius and .95 atmospheres?
  37. chemisty help please

    A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius What volume would this occupy at 26 degrees Celsius and .95 atmospheres?
  38. chemistry

    A gas has a volume of 590 mL At a temperature of -55.0 degrees celsius. What volume will the gas occupy at 30.0 degrees celsius? show your work. I'm just confused as to how to start this and the steps required. I'm not asking for an answer, but rather some
  39. Chemistry

    If the temperature of a confined gas is doubled at constant pressure, what change is observed? A) The volume of the gas is decreased to 1/4 of its original value. B) The volume of the gas is increased to twice its original value. C) The density of the gas
  40. math

    This cube has five cubes along each edge. The faces are covered, but the cube is hollow inside. Can it be divided into two pieces of equal volume? Explain. I am not sure what this question is asking? Does this look right? l x w x h= 5x5x5=125 125/2=62.5
  41. Chemistry

    Find the pressure of a gas that originally had a volume of 25 L, pressure of 67kPa at a temperature of 100 Kelvin. When the gas was heated to 200 Kelvin, it had a volume of 56L. How many moles would be present if the gas in the above question was an ideal
  42. CHEMISTRY

    1.A scuba diver's tank contains 0.29 kg of O2 compressed into a volume of 2.3 L. a)Calculate the gas pressure inside the tank when the temperature is 9oC. b)calculate the volume of oxygen if the temperature is 26oC and the pressure is 0.095 atm.
  43. math

    The volume of metal in a scale model of an mobile phone tower is 54 cm^3. The scale was 1:50. It required 5 ml of paint to give the model one coat. Find the volume of mental in cubic metres would be required to build the tower.
  44. Calc

    Air is being pumped into a spherical balloon so that its volume increases at a rate of 90{cm}^3/s. How fast is the surface area of the balloon increasing when its radius is 7{cm}? Recall that a ball of radius r has volume \displaystyle V={4}/{3}pie r^3 and
  45. Chemistry

    I did a simple distillation and a fractional distillation to purify acetone. How do I determine the concentration of acetone? (Instructions say this is not a simple M=mol/L calculation). My guess was to divide the volume of purified acetone by the volume
  46. Geometry

    One advantage of the prismoidal formula is that you can use it to A. determine volumes of figures that aren't prismoids. B. estimate the volume of solids that are combinations of other solids. C. calculate precise volumes of all prismoids. D. calculate
  47. ordinary differential equation

    A contains 200 liters of solution in which is dissolved 40 kg of salt. Tank B contains 400 liters of solution in which are dissolved 80 kg of salt. Pure water flows into tank A at rate of 10 liters per second. There is a drain at the bottom of tank A.
  48. Math

    The volume of a gas varies inversely as applied pressure if the pressure acting on a 45m^3 of gas is lowered from 3 atmospheres to 2 atmospheres what new volume does the gas occupy
  49. chemistry

    A sample of gas in a balloon has an initial temperature of 9.0∘C and a volume of 1.75×103L . If the temperature changes to 80.∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
  50. Engineering Physics

    An ideal gas at 12.1 °C and a pressure of 2.38 x 105 Pa occupies a volume of 2.88 m3. (a) How many moles of gas are present? (b) If the volume is raised to 4.70 m3 and the temperature raised to 28.3 °C, what will be the pressure of the gas?
  51. Algebra

    if there are 2 cylindrical cans. A label on the small one says it has a volume of 513 grams. the large one was destroyed. the small can's diameter was the same as the large can. large was 1/3 taller than the small can. what is the volume of the large can?
  52. Math

    A small cone of height 8 cm is cut off from a bigger cone to leave a frustum of height 16 cm. If the volume of the smaller cone is 260 cm^3, find the volume of the frustum.
  53. Chemistry

    Two closed vessels of equal volume both with pressure p1 and temperature t1 are connected to each other by tube with negligible volume. If the temperature maintained of both vessels is then changed to t1 and t2 respectively what is the pressure in the
  54. Physical science

    A piece of metal has a mass 85 cg and a volume of 450L. What is the density g/cm cubed? What would be the mass of 300 cm cubed of this metal? What would be the volume of 200 ounces of this metal?
  55. chem

    A sample of gas in a balloon has an initial temperature of 19 ∘ C and a volume of 1.47×103L . If the temperature changes to 63 ∘ C , and there is no change of pressure or amount of gas, what is the new volume, V 2 , of the gas?
  56. chemistry

    A fixed amount of CH4 gas occupies a volume of 136 mL at a pressure of 567 mm Hg and a temperature of 19oC. What will be the volume, in mL, occupied by this sample of CH4 gas when the pressure is decreased to 421 mm Hg while holding the temperature
  57. math

    For this assignment, you will be finding the surface area and the volume of three different spherical objects. You will need to find three objects and measure the distance around the center using a ruler or tape measure. Show all work! I am using a lemon
  58. calculus

    Estimate the volume of the solid that lies below the surface z = xy and above the following rectangle. R = (x, y)|8 ≤ x ≤ 14, 4 ≤ y ≤ 8 Use a Riemann sum with m = 3, n = 2, and take the sample point to be the upper right corner of
  59. Geometry

    I need an example of two cereal boxes that have the same volume but different surface area. I need the brand and box sizes. Then I need to pick one of the cereal boxes and redesign it so that it has the same volume but less surface area. Why do you think
  60. chemistry

    A ballot at 35 degrees celsius has a volume of 2.5 liters. what is its volume at 45 degrees celsius ?
  61. Math

    Water spraying from a large fountain follows a path modelled by the function h(d) = sa001-1.jpgd2 + 4d, for h ³ 0, where h is the height of the water above the fountain jet and d is the horizontal distance of the water from the fountain jet, both in Water
  62. Chemistry

    Automobile air bags employ a chemical reaction involving the rapid decomposition of sodium azide (NaN3) into sodium metal and nitrogen gas to inflate in a collision. How much sodium azide is required to decompose to inflate a 20.0 L air bag? Assume that
  63. chemistry

    Whenever organic matter is decomposed under oxygen free conditions, methane is one of the products. Thus enormous deposits of natural gas, which is almost entirely methane, serve as a major source of fuel for home and industry (dHrxn for the combustion of
  64. chemistry

    Water in contact with air is acidic due to the dissolved carbon dioxide. Water in equilibrium with the air contains 4.4 x 10^-6% CO2. The resulting carbonic acid, H2CO3,gives the solution a hydrogen ion concentration of 2.0 x 10^-6M, about 20 times larger
  65. Chemistry

    Classify each of the following as a heterogeneous mixture (M) or homogeneous mixture (S)or compound (C) or element (E). oxygen dissolved in water - S carbon mixed with sand - M apple juice - S vegetable soup -M sour, curdled milk -M steel -S hydrogen -E
  66. Chemistry

    I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 :
  67. Chemistry

    I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 :
  68. chemistry

    Block A of an unknown metal has a volume of 125 cm3. Block B of a different metal has a volume of 145 cm3. If block A has a greater mass than block B, what can be said of the relative densities of the two metals? (Assume that both blocks are solid.)
  69. Physics

    The volume of a gas is changed along the curved line between A and B in the drawing. Do not assume that the curved line is an isotherm or that the gas is ideal. pressure and volume are: 2.0x10^4 Pa and 2.0x10^(-3) m^3 (a) Find the magnitude of the work for
  70. chem help

    Initially a gas is at a pressure of 12 atm, a volume of 23 L, and a temperature of 200 K, and then the pressure is raised to 14 atm and the temperature to 300 K. What is the new volume of the gas? Round to the nearest tenth. Don't forget the units.
  71. math

    1.What is the diameter of a sphere that has a volume of 3052.08 m^3? My answer is: 9m 2.What is the radius of a sphere that has a volume of 2304π m^3? My answer is:12m ~If i get it wrong please explain it to me how to get it, i know the formula and how to
  72. bonar law

    Colonel Harry a. Froboess of Switzerland jumped upward and outward from a windonw of a blimp and landed in a body of water on June 22, 1936. His jump was 120m, about the height of a 40-storey building. The path of his jump can be represented by the
  73. Maths help

    Hi MY question is if a cylinder has a volume of 72cm cubed and a cross-sectional area of 18cm squared. Work out the height of the cylinder Can someone show me how we do it by the steps The cross-section of a cylinder is a circle. so pi(r)^2=18 solve for r
  74. Physics II

    1.given 30 m^3 of helium at 15 degree c and 1.0x10^5 Pa, determine the volume at -6 degree c and 5.6x10^4 Pa 2. if a mass of gas occupies 500 l at 16 degree c and 10^5 Pa,determine the volume at 38 degree c and 1.7x10^5 Pa. 3. Calculate the final
  75. chem

    If I initially have a gas at a pressure of 13.5 atm, a volume of 2300 mL, and a temperature of 200 K, and then I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas? Report the answer in correct number of
  76. math

    If a cylinder’s height is four times its radius, if the cyclinder’s volume (ignoring the metals’ thickness) is 1000 cubic centimeters, and if the radius and hence the height could be in error plus or minus .2325%, determine the relative percentage
  77. chem

    A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius What volume would this occupy at 26 degrees Celsius and .95 atmospheres? can someone
  78. CHEMISTRY !!! HELP !

    Calculate the pH of the solution after the addition of the following amounts of 0.0617 M HNO3 to a 70.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04. 1)Volume of HNO3 equal to the equivalence point 2)89.5mL of HNO3 I got pH= 7.37 for 1
  79. chem

    In a vehicle, H2 could be used in a fuel cell to generate energy. Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used. 2
  80. chem - br bob is this right

    What is the pH of a solution prepared by adding 4.000 grams of NaOH to a 50.00 mL of a buffer that is 2.00 molar both in acetic acid and sodium acetate? (Assume final volume is still 50.00 mL) * chem - DrBob222, Wednesday, April 21, 2010 at 10:52pm * chem
  81. Finance/math

    Reimbursement per screen 66.05 Equip cost/mo 1450.00 technologist cost per Mammography $15.60 tech aid/per $3.10 Variable cost per mamo $15.00 Equip. maintanance/mo. per machine $916.66 1) what is the monthly patient volume needed per month to cover fixed
  82. Physics

    A glass flask with a mass ok 3.00kg and volume of 1000 cm3 is completely filled with mercury and is at a temperature of 55.0oC. The flask is then lowered into an ice water bath. After thermal equilibrium is reached, (a) what percentage of the flask will be
  83. Physical science

    What formula's should I use to solve these problems? A 1.04x10^3 kg car accelerates uniformly from rest to 12 m/s in 2.16 seconds. a) What is the work done on the car in this time interval? Answer in Joules. b) What is the power delivered by the engine in
  84. Physical science

    What formula's do I use to solve these problems? A 1.04x10^3 kg car accelerates uniformly from rest to 12 m/s in 2.16 seconds. a) What is the work done on the car in this time interval? Answer in Joules. b) What is the power delivered by the engine in this
  85. Health and Physical education just three questions

    1 The Body's reaction to information is to send these to the brain. A neurons B impulses C dendrites D synapse 2 The part of the brain that controls movements and balance is the A cerebrum B derebellum C brain stem D frontal lobe 3 When diving into water,
  86. Biochemistry

    Can someone help me calculate protein concentration using the Bradford Assay? If you could show me how to do tube 2, that'd be great. Tube 1: 0 ul Protein Stock Solution, 800 ul Water, 0 ug Protein, Absorbance @595nm = 0 Tube 2: 10 ul Protein Stock
  87. chemistry

    A 0.286g sample of Zn was used to produce H2(g)by the reaction. Zn(s)+ 2HCl(aq)> ZnCl2(aq) + H2(g) The barometric pressure was recorded as 761.6mm Hg and room temperature was 20degreesC. When the water levels of the eudiometer tube and graduated
  88. Physics(Please help, thanks)

    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
  89. chemistry

    the fictitious compound pandemonium fluoride has a k value in water of 3.091*10^-9 M^3.calculate the solubility of PnF2 in water. Express your answer in units of molarity.
  90. chemistry

    the fictitious compound pandemonium fluoride has a k value in water of 3.091*10^-9 M^3.calculate the solubility of PnF2 in water. Express your answer in units of molarity.
  91. physics

    A fire hose held near the ground shoots water at a speed of 5.5 .At what angle(s) should the nozzle point in order that the water land 2.0 away (see the figure )?
  92. Chemistry Help!

    When C2H4O2 burns in oxygen, the products are carbon dioxide and water. How many grams of water are obtained from burning 4.76 g of this substance? How would I solve this problem?
  93. Physics

    . Determine the temperature, T that results when 150 g of ice at 0°C is mixed with 300 g of water at 50°C. Given heat of fusion, l of water = 3.35 × 105 J/kg, cwater = 4186 J/kg∙oC.
  94. Chem

    A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
  95. Plz help me... one science Q!

    18. A pebble drops straight down into a tub of water, setting off ____________________ waves that travel at the boundary between the water and air. (1 point)
  96. chemistry

    A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
  97. science

    when the beaker of water is heated what will happen to the level of water in the tube. this thermometer would be no use to measure the temperature in the freezer.write 2 sentences to explain why
  98. physics

    From a cliff that is 8.9 m above a lake, a young woman (mass 44 kg) jumps from rest, straight down into the water. At the instant she strikes the water, what is her de Broglie wavelength?
  99. physics

    From a cliff that is 8.2 m above a lake, a young woman (mass 42 kg) jumps from rest, straight down into the water. At the instant she strikes the water, what is her de Broglie wavelength?
  100. chemistry

    Calculate the change in enthalpy produced by dissolving 14.3 g of NaOH in 65.0 g of water if the temperature increases 49.1°C and the specific heat of water is 4.18 J/g°C I believe you multiply 4.18, 65.0, and 49.1. Am I correct