1. physics

    The nucleus of a hydrogen atom is a single proton, which has a radius of about 1.0 10-15 m. The single electron in a hydrogen atom normally orbits the nucleus at a distance of 5.3 10-11 m. What is the ratio of the density of the hydrogen nucleus to the

    asked by MIke on December 1, 2006
  2. physics

    Here is a demonstration Pascal used to show the importance of a fluid's pressure on the fluid's depth(Figure 1) : An oak barrel with a lid of area 0.17m2 is filled with water. Along, thin tube of cross-sectional area 5.0×10−5m2 is inserted into a hole

    asked by bety on April 11, 2014
  3. Chemistry

    How much energy (in Joules) is required to heat 10.48 g of water from 12.7 oC to 46.3 oC ? Use 4.184 J/goC as the specific heat capacity of water. 53 g of water at 81.5 oC is added to a calorimeter that contains 50.52 g of water at 40.6 oC. If the final

    asked by Lee on October 17, 2017
  4. algebra

    Sarah blends coffee for Tasti-Delight. She needs to prepare 170 lbs of blended coffee beans selling for $3.59 per pound. She plans to do this by blending together a high-quality bean costing $5.00 per pound and a cheaper bean at $2.00 per pound. To the

    asked by lauren on February 9, 2012
  5. algebra 1

    Sarah blends coffee for Tasti-Delight. She needs to prepare 170 lbs of blended coffee beans selling for $3.59 per pound. She plans to do this by blending together a high-quality bean costing $5.00 per pound and a cheaper bean at $2.00 per pound. To the

    asked by Anonymous on February 10, 2012
  6. waist water treatment

    1/Why do the following components need to be removed from sewage under current law before it can be discharged on the surface water? Nitrogen Algea growth in receiving water Growth of waterborne diseases Turbidity increase of receiving water Oxygen

    asked by duke on November 18, 2013
  7. physics

    The exhaust temperature of a heat engine is 250∘C .What must be the high temperature if the Carnot efficiency is to be 35% ?

    asked by Anonymous on June 5, 2014
  8. Advanced Functions

    A diver is on the 10 m platform, preparing to perform a dive. The diver’s height above the water, in metres, at time t can be modelled using the equation h(t)= 10+ 2t - 4.9t^2. a) Determine when the diver will enter the water. b) Estimate the rate at

    asked by Ryrin on September 27, 2017
  9. Chemistry

    Can someone please answer one of these question so I would be able to know how to do the others? 1. What volume of 0.275 M KOH (aq) must be added to 75.0 mL of 0.137 M H3AsO4 (aq) to reach (a) the first stoichiometric pony; (b) the second stoichiometric

    asked by Anonymous on March 22, 2015
  10. Physics

    A metal cylinder with a area of 0.01m^2 and height of 0.1m is suspended levelly in water with a thin string. a)What is the water pressure on the top and bottom of the cylinder if the cylinder top is 1m below the water surface? And the amount of buoyant

    asked by Jermaine on April 24, 2012
  11. college alegebra

    Solve the problem. The volume V of a gas varies inversely as the pressure P on it. The volume of a gas is 240 cm3 under a pressure of 23 kg/cm2 What will be its volume under a pressure of 30 kg/cm2?

    asked by tony on February 25, 2009
  12. Algebra

    Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4L, the pressure is 165 kPa(kilopascals). What is the volume when the pressure is 60 kPa?

    asked by Rachal on June 7, 2011
  13. 7th Grade Help

    If the temperature increases in a sample of gas at constant volume, then its a. volume increases b. pressure decreases c. pressure increases d. volume decreases Plz help me, I don't know it.

    asked by completeidiot on September 8, 2012
  14. math scientifi notation

    i need to write the each number in scientifi notation. the brain contatins about 100 trillion nerve connections i wrote: 1 x 10^11 power the volume of the water behind the grand coulee dam is aobut 10.6 million cubic yards i wrote: 1.06 x 10^2 power are

    asked by marko on December 1, 2011
  15. chemistry

    Given the following chemical reaction: Zn+HCl-->ZnCl2+H2(g) If you measured the total volume of collected gas over water at 20 degrees celcius t be 428ml at a total pressure of 845 torr, how many milliliters of 2.6M HCl would be required to produce the

    asked by regina on December 5, 2010
  16. chemistry

    1 gm of magnesium is burnt in a closed container which contains 2 l of air at ntp containing 21 percent oxygen by volume find limiting reagent, mass of excess reagent left over, mass of mgo produced, number of mg and oh ion formed by dissolving it with

    asked by David on January 15, 2016
  17. Chemistry

    In an experiment, you dissolve 0.30 g of KHP (MM = 204.22 g/mol) in 20 mL of DI water and titrate the sample with 0.10 M NaOH. Calculate the volume (to the nearest mL) of NaOH required to reach the equivalence point. IS it a) 3 b)15 c)20 d)30 e)100 I have

    asked by Lena on January 8, 2015
  18. physics

    A heat engine receives 7.0 x 10^3 J of heat and loses 3.0 x 10^3 J in each cycle. What is the efficiency? 1-30% 2-43% 3-57% 4-70% 5-100%

    asked by shirly on February 24, 2014
  19. physics

    How far is the rocket from the launch pad 8.50s later when the rocket engine runs out of fuel?

    asked by Anonymous on September 11, 2014
  20. Math

    A tank contains a certain amount of water. Each month half of the water in the tank evaporates and an extra liter of water is added. After 5 months, after the litres of water is added, there were 4 litres of water in the tank. How many litres were in the

    asked by Anonymous on September 1, 2014
  21. Physics

    A plastic sphere has a density that is greater than oil but less than water when itis placed in cylinder containing water, it is exactly half submerged, explain why when oil poured on top of water. The sphere is only 1/4 submerged in water.

    asked by sachi on May 6, 2012
  22. Chemistry

    The temperature of 100.0 mL of water was raised from 26.7 degrees C to 62.3 degrees C. How much heat in calories was added to the water? (The specific heat of water is 1.000 cal/g degrees C and the density of water at 26.7 degrees C is 0.996626 g/mL)

    asked by Ally on April 1, 2010
  23. physics

    If the filliament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12 volt battery? I got 36 watts? would I divide 12 volts/3 ohms= 4 amps

    asked by erica on October 26, 2007
  24. Math

    How long does it take an automobile traveling in the left lane of a highway at 70.0 km/h to overtake (become even with) another car that is traveling in the right lane at 20.0 km/h when the cars' front bumpers are initially 110 m apart? s

    asked by anonymous on February 15, 2012
  25. Volume

    A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to

    asked by alexis on May 13, 2008
  26. Volume

    A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to

    asked by alexis on May 13, 2008
  27. Volume

    A plant manager built a storage container that is 4 yd long, 10yd wide, and 2 yd tall to store foam reanuts. If the manager purchases bags that contain 7FTcubed of peanuts how many bags of peanuts will it take to fill the container? I converted the yd's to

    asked by alexis on May 13, 2008
  28. calculus

    Assume that the radius ,r , of a sphere is expanding at a rate of 10in./min. The volume of a sphere is V=43πr^3. Determine the rate at which the volume is changing with respect to time when r=5in. The volume is changing at a rate of how many in^3/min.?

    asked by Marquese on April 30, 2016
  29. physics

    A diver springs upward from a board that is 2.98 meters above the water. At the instant she contacts the water her speed is 9.39 m/s and her body makes an angle of 70.4° with respect to the horizontal surface of the water. Determine her initial velocity.

    asked by katherine on September 12, 2012
  30. Physics

    A high diver of mass 69.4 kg jumps off a board 9.6 m above the water. The acceleration of gravity is 9.8 m/s2.If his downward motion is stopped 2.21 s after he enters the water, what average upward force did the water exert on him? Answer in units of N

    asked by Neha on October 15, 2011
  31. Physics 201

    A diver springs upward from a board that is 2.90 meters above the water. At the instant she contacts the water her speed is 9.11 m/s and her body makes an angle of 78.2° with respect to the horizontal surface of the water. Determine her initial velocity.

    asked by Kenisha Frinks on January 30, 2016
  32. Science

    Write a short essay in which you create an analogy to describe particle motion. Compare the movements and positions of people dancing with the motions of water molecules in liquid water and in water vapor.

    asked by Brendan on December 16, 2016
  33. Calculus

    I actually have two questions: 4. An open box is to be made from a rectangular piece of material 3m by 2m by cutting a congruent square from each corner and folding up the sides. What are the dimensions of the box of the largest volume made this way, and

    asked by Anonymous on May 19, 2010
  34. Physics

    -The brakes on your automobile are capable of creating acceleration of 19 ft/s2. If you are going 76 mi/hr and suddenly see a state trooper, what is the minimum time required to get your car to 55 mi/hr? For this answer, I got 1.62 s. -How far do you

    asked by Lindsay on October 4, 2007
  35. algebra

    When an automobile accelerates, the power, P, needed to overcome air resistance varies directly with a power of the speed, v P=kv^n Use data to find the scalling exponent and the constant of variation v 10 20 30 40 p 355 2840 9585 22,720

    asked by Rebecca on November 4, 2012
  36. Physics center of gravity

    a uniform bridge span weighs 50000N and is 40m long. An automobile weighing 15000N is parked with its center of gravity located 12m from the right pier. What upward support does the left pier provide?

    asked by Kayla on November 21, 2008
  37. PHYSICS

    Given: the linear expansion coefficient of glass is 9 x 10^-6 ('C)^-1. An automobile windshield has dimensions of 59 cm by 390 cm. What minimum spacing around the windshield is needed to prevent the windshield from breaking if the temp. changes by 146' F?

    asked by elisabeth on February 26, 2010
  38. PHYSICS

    Given: the linear expansion coefficient of glass is 9 x 10^-6 ('C)^-1. An automobile windshield has dimensions of 59 cm by 390 cm. What minimum spacing around the windshield is needed to prevent the windshield from breaking if the temp. changes by 146' F?

    asked by elisabeth on February 26, 2010
  39. physics

    Given: the linear expansion coefficient of glass is 9 x 10^-6 ('C)^-1. An automobile windshield has dimensions of 59 cm by 390 cm. What minimum spacing around the windshield is needed to prevent the windshield from breaking if the temp. changes by 146' F?

    asked by elisabeth on February 26, 2010
  40. algebra

    The volume V of a gas varies inversely as the pressure P and directly as the temperature T. A certain gas has a volume of 20 L, and a temperature of 320 K, and a pressure of 1 atm. If the gas is compressed to a volume of 15 L and is heated to 330 K, what

    asked by bob on January 27, 2009
  41. algebra

    In a rectangular prism, the length and width are multiplied by 4. What is the relationship of the volume of the resulting rectangular prism compared to the original volume of the rectangular prism? Is the new volume 8 times geater than original?

    asked by Mary on May 15, 2011
  42. English

    I forgot to add these sentences. Thank you very much. 1) The rise in population caused an increase in the demand for clothes. As more energy was needed to drive machinery, the steam engine (power?) was introduced (developed?). 2) The introduction of the

    asked by Henry2 on July 4, 2011
  43. Physics

    An engine has an efficiency of 61% and produces 7900 J of work. Determine each of the following. (a) the input heat J (b) the rejected heat J

    asked by Johnson on April 18, 2008
  44. physics

    In one cycle, a heat engine absorbs 4400 J at 500C and exhausts 400 J. How much work does it do per cycle?

    asked by Nadya on November 18, 2010
  45. Physics

    A heat engine does 650 J of work and dumps 1270 J of heat to its cold reservoir. What is its efficiency?

    asked by Seth on April 16, 2013
  46. Physics Help!!!

    In one cycle, a heat engine absorbs 5900 J at 360°C and exhausts 520 J. How much work does it do per cycle?

    asked by ashley on November 11, 2010
  47. Data managment math

    1:A train is to consist of three flatcars, five tankers, six boxcars, an engine and a caboose.In how many ways can the train be made ?

    asked by Samir on January 23, 2008
  48. College Physics

    What mass can a 20000 watss engine pull at a speed of 30 m/s. If coefficient of friction is 0.15 between the mass and ground?

    asked by Mai Mendoza on May 18, 2017
  49. Physics

    An engine has an efficiency of 59% and produces 5300 J of work. Determine each of the following. (a) the input heat J (b) the rejected heat J

    asked by Kiante on April 19, 2008
  50. Physics

    The crankshaft of an engine increases its spin from 1,200 rpm to 1,500 rpm in 0.50 s. What is its angular acceleration

    asked by Ron on December 12, 2014
  51. physics

    The index of refraction of water for a given monochromatic light in water is n=4/3. The wavelength of this light in water is 500nm. a) find the speed of this light in water. b) find the energy of one photon of this light . Does this enerdy change if this

    asked by vicky on February 23, 2017
  52. college chemistry

    a student did an alkalinity determination correctly,except that the sample titrated had a volume of 90.0 mL. Volume A was found to be 4.50 mL and Volume B was 7.00 mL. 1)Calculate the Alkalinity value from these data and then calculate the correct

    asked by alissa on March 25, 2010
  53. Physicss

    a typical woman gives off heat at rate of about 8000 calories per hour. how long would a woman have to stay in a bath of 60L (60,000 g) of 26 C water in order to raise the water temperature to 30 c ? presume that all the heat given off by the woman is

    asked by mary on May 9, 2013
  54. Physics

    A 325 kg boat is sailing 15.0 degrees north of east at a speed of 2.00 m/s. Thirty seconds later, it is sailing 35.0 degrees north of east at a speed of 4.00 m/s. During this time three forces act on the boat: a 31.0 N force directed 15.0 degrees north of

    asked by Melanie on October 14, 2010
  55. Chemistry

    The heat of combustion of C2H4 at 27 C at constant prssure is -333.3 Kcal. What will be the heat of combustion at constant volume considering the water to be in liquid state? (R=1.987 cal)

    asked by Sidharth on October 22, 2016
  56. chemistry

    1. A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?

    asked by Montie Stengel on May 13, 2016
  57. ap physics

    A 6.2 cm diameter pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 30.0 kPa and 24.0 kPa, respectively. What is the volume rate of flow?

    asked by Anonymous on April 14, 2010
  58. ap physics

    A 6.2 cm diameter pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 30.0 kPa and 24.0 kPa, respectively. What is the volume rate of flow?

    asked by Anonymous on April 14, 2010
  59. chemistry

    hydrogen gas reacts with oxygen gas to produce water if a student fills a 250-mL flask with hydrogen at STP, what volume of oxygen is necessary for the reaction?

    asked by yaziie on November 20, 2014
  60. chemistry

    A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?

    asked by chrissy on May 12, 2016
  61. Biophysical Chemistry

    A mole of liquid water is vaporized at 100 degree C and 1 atm. Th heat of vaporization is 40.7 kJ/mol. What are the values of Wrev, q, detaU and deta H? I'm not sure what is the volume because the pressure it not change so I so confort can I use Wrev =

    asked by Laura on December 22, 2010
  62. chemistry

    a solution is prepared by mixing 1.0 grams of benzen(c6h6) in 100g of water to create a solution total volume of 100ml.calculate the molarity,mass percent,mole fraction and molarity of benzene in the solution

    asked by john on August 26, 2014
  63. Physics

    Water (η = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0120 m3/s. As the figure below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0421 m and L = 0.706 m. Calculate the radius of the

    asked by Alexa on November 15, 2012
  64. Chemistry

    The mass of a sample of a liquid compound was found to be 0.534 g after the compound was vaporized in a containter placed in a boiling water bath at 100°C at 748 torr. The volume of the container was 286mL. Calculate the molecular mass of the compound.

    asked by Anonymous on October 25, 2011
  65. chemistry

    A sample of 7.83 grams of NaOH is dissolved into 620 mL of aqueous 0.250 M NaOH (as- sume no volume change). This solution is then poured into 1.67 gallons of water. (You may assume that the two volumes can be added.) What is the concentration of NaOH in

    asked by Anonymous on September 6, 2010
  66. chem 3A

    please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems. 1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical equation for the reaction is:

    asked by shylo on July 26, 2008
  67. Chemistry

    You prepare a buffer solution by dissolving 2.00 g each of benzoic acid, C6H5COOH and sodium benzoate, NaC6H5COO in 750.0 mL of water. What is the pH of this buffer? Assume that the solution's volume is 750.0 mL.

    asked by Dron on April 24, 2016
  68. chemistry

    75.0 mL of a 1.50 M solution is diluted to a total volume of 278 mL. A 139-mL portion of that solution is diluted by adding 139 mL of water. What is the final concentration? Assume the volumes are additive.

    asked by tia on October 15, 2016
  69. chemistry

    AgNO3 was dissolved in water to make 10mL of solution. Then 3.0mL of that solution was used to make a new solution with a total volume of 1.000L. What was the concentration of the silver ion in the final solution?

    asked by Anonymous on October 5, 2009
  70. Chem 2

    Argon makes up 0.93% by volume of air. Calculate its solubility (mol/L) in water at 20C and 1.0 atm. Henry's law constant for Argon under these conditions is 1.5 x 10^-3 mol/L*atm.

    asked by Mike on March 30, 2010
  71. dunno maths help asap

    The volume of water inside a swimming pool doubles every hour. If the pool is filled to its full capacity within 8hours, in how many hours was it filled to one quarter of its capacity? Help step

    asked by erami on March 15, 2017
  72. physics

    A 5.4 cm diameter horizontal pipe gradually narrows to 3.7 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 35.0 kPa and 21.0 kPa, respectively. What is the volume rate of flow?

    asked by Cara on May 10, 2011
  73. Calculus - HELP URGENT PLEASE

    Consider a lake of constant volume 12200 km^3, which at time t contains an amount y(t) tons of pollutant evenly distributed throughout the lake with a concentration y(t)/12200 tons/km^3. assume that fresh water enters the lake at a rate of 67.1 km^3/yr,

    asked by Ashley on August 20, 2015
  74. Chemistry

    A 35.00 mL sample of water at 30.0°C is placed in an open container with an external pressure of 1.00 atm. 30.0 kJ of heat is added to the water sample. The density of water is 1 g/mL. (a) How many grams of liquid water remain at the end of the process?

    asked by N on February 11, 2015
  75. physics

    A rubber ball filled with air has a diameter of 25.1 cm and a mass of 0.618 kg. What force is required to hold the ball in equilibrium immediately below the surface of water in a swimming pool? I tried using the equation B = density(fluid)volume(object)g B

    asked by Kelsey on April 17, 2010
  76. Chemistry

    2HCr4- + 3HS03- + 5H+ -> 2Cr3+ + 3SO4^2- + 5H20. At t=0, 0.0249 mols of HCr04- are loaded in to 250ml of solution. After 1/10 of an hour, 0.00852 mol of HCrO4- remain. Assuming the solution volume remained the same, how many grams of water were formed per

    asked by Tri on September 23, 2008
  77. Physics

    An automobile is traveling 65 km/hr. It brakes decelerate it 6.o m/s^2. a) How long will it take to stop the car? b) How far will the car travel after the brakes are applied?

    asked by may on November 4, 2010
  78. chemistry

    the total mass of a vehicle is due to 56 Fe, what mass of a 1.4 metric ton(tonne) automobile is due to the electrons?

    asked by ducky on September 27, 2010
  79. Science Question

    Which of the following statements best describes what is happening in a water softening unit? The hard ions are all trapped in the softener, which filets out all the ions. The ions in the water softener are softened by chemically bonding with sodium. The

    asked by Layla on February 7, 2013
  80. Chemistry

    I'm so confused as to how to even begin the problem and where to put whats given to me into an equation. 1) If the value of Kp is 0.5 for the distribution of a compound between pentane (solvent 2) and water (solvent 1), and equal volumes of the two

    asked by Anonymous on August 10, 2011
  81. CHEM

    A 0.552 g sample of ascorbic acid(Vitamin C) was dissolved in water to a total volume of 20.0 ml and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 ml. The pH of the solution at 10.0 ml of added base was 3.72. From this data, determine

    asked by Cooper on March 21, 2012
  82. General Chemistry I

    A sample of gas occupies a volume of 59.9 mL. As it expands, it does 126.2 J of work on its surroundings at a constant pressure of 798 torr. What is the final volume of the gas? a. 61.1 mL b. 1,250 mL c. 218 mL d. 1,490 mL e. None of the above I used the

    asked by Emily on December 4, 2012
  83. last physics problem.

    At 25.0 m below the surface of the sea(density=1025 kg/m^3) where the temperature is 5.00 C, a diver exhales an air bubble having a volume of 1.00 cm^3. If the surface temperature of the sea is 20.0 C, what is the volume of the bubble just before it breaks

    asked by jean on April 19, 2007
  84. chemistry

    Oganic solvents are not suited to be heated with one of the followings: Oil Bath Electric hot plate Water bath Bunsen burner flame 2 Which of the following is not an inflammable liquid ? Water Ethanol Kerosine Benzene 3 These are some safety precausions

    asked by onyi on September 16, 2015
  85. Calculus

    A manufacturer constructs open boxes from sheets of cardboard that are 6 inches square by cutting small squares from the corners and folding up the sides. The Research and Development Department asks you to determine the size of the square that produces a

    asked by Isaac on August 9, 2011
  86. biochem

    The pKa of butanoic acid is 4.87. A student mixes 120 mL of 0.45 M butanoic acid with 50 mL of 0.3 M NaOH and adds water to give a final volume of 1 L. What is the pH of the final solution? Please show you work.

    asked by Kim on August 31, 2015
  87. HVAC

    the density of a solid or liquid material divided by the density of water is called the_____ of the material. latent heat specific volume critical point specific gravity

    asked by simon on December 13, 2017
  88. Biology/math

    The dimensions of each corner square in the haemocytometer are 0.1 cm x 0.1 cm x 0.01 cm. (Hint: 1 cm3 = 1 mL) a) Calculate the volume of a corner square. b) Calculate the density of the cells in your tube (in cells/mL). c) What volume of your cells

    asked by Brandon DB on October 21, 2018
  89. geometry

    the volume of a larger prism is 128 cubic cm. if the prisms are similar with linear ration of 4:3, what is the volume of the smaller prism? We have a theorem that says The volumes of similar objects are proportional to the cubes of their sides. So let the

    asked by Emily on April 26, 2007
  90. Science

    5 ml of water at 4 degree Celsius (density 1 g/ml) is converted to steam at 110 degree Celsius. What volume will the steam occupy when pressure is 380 Torr?

    asked by Ayshi on June 29, 2013
  91. chemistry

    What volume of 9.54M sodium chloride solution must be added to the correct amount of water to produce 750. mL of a .327 M sodium chloride solution?

    asked by Dee on November 17, 2010
  92. Chemistry

    Frances wanted to prepare a 0.0285M standard solution of LiCl. She weighed out 27.5g of solid LiCl. She had plenty of water available. What volume of the solution was she able to prepare?

    asked by Adalaide on August 18, 2013
  93. statistics

    Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random

    asked by Anonymous on November 6, 2012
  94. calculus

    Question 1 The figure below shows the rate of change of the quantity of water in a water tower, in liters per day, during the month of April. If the tower had liters of water in it on April 1, estimate the quantity of water in the tower on April . Round

    asked by megan on November 11, 2011
  95. physics

    i'm in 5th grade and i really need some help. in science, we got this science packet that's really hard. it's really hard. the question is: Jarrod measured the temperatures of two containers of water with two different thermometers. The water in Container

    asked by deja on April 7, 2011
  96. science help pls pls

    Which of the following best explains how water conservation can reduce waterborne diseases in a community? More people will have clean water to drink and bathe in. More people will drink bottled water imported from faraway springs. More people will be

    asked by Oscar on April 5, 2016
  97. chemistry

    A 18.3 g piece of aluminum (which has a molar heat capacity of 24.03 J/oC mol) is heated to 82.4oC and dropped into a calorimeter containing water (specific heat capacity of water is 4.18 J/goC) initially at 22.3oC. The final temperature of the water is

    asked by mathew on November 18, 2014
  98. Chemistry

    A certain microwave oven delivers 633 watts (J/s) of power to a coffee cup containing 53.1 g of water at 25°C. If the wavelength of microwaves in the oven is 9.75 cm, how long does it take, and how many photons must be absorbed, to make the water boil?

    asked by Sarah on January 24, 2012
  99. chemistry

    what happens when solids, liquids, and gases are heated/cooled? Most expand if heated; contract if cooled. Solids, if heated high enough will melt and the liquid may occupy less volume than the solid. Likewise, liquids, if heated high enough, will boil and

    asked by carter on October 9, 2006
  100. Physics

    An automobile weighing 15,000 N crashes into a wall with a velocity of 5.00 m/s. If the car moves 0.150 m before coming to a stop, what average force does the wall exert on the car?

    asked by Aidan on December 12, 2015