Most popular questions and responses by Christy
  1. pre-calculus

    Express the edge length of a cube as a function of the cube's diagonal length d. Then express the surface area and volume of the cube as a function of the diagonal length.

    asked on January 12, 2014
  2. physics

    In lab you submerge 100 g of 41 degree Celcius iron nails in 100 g of 25 degree Celcius water (the specific heat of iron is 0.12 cal/g degrees Celcius) A)Equate the heat gained by the water to the heat lost by the nails and find the final temperature of

    asked on April 3, 2012
  3. Chemistry

    Phosphoric acid reacts with magnesium hydroxide to produce magnesium phosphate and water via the following reaction:H3PO4 + Mg(OH)2 -----> Mg3(PO4)2 + H2O.Balance the equation, then enter the coefficients

    asked on May 30, 2011
  4. physics

    Water with a mass of 0.500 kg at 15.0 degree C is mixed with 0.800 kg of water at 35.0 degree C. What is the final temperature T_f of the mixture?

    asked on April 3, 2012
  5. chemistry

    A 25 g gold nugget with an initial temperature of 60 °C is dropped into an insulated cup containing 100 ml of water initially at a temperature of 5°C. What is the final temperature after thermal equilibrium is established? Refer to Table 3.4 of the text

    asked on February 26, 2018
  6. physics

    Find the mass of 0 degree C ice that 15 g of 100 degree Csteam will completely melt.

    asked on April 3, 2012

    A 4 kg block is pushed along the ceiling with a constant applied force of 85 N that acts at an angle of 55 degrees with the horizontal. The block accelerates to the right at 6 m/s^2. determine the coefficient of kinetic friction between the block and the

    asked on February 24, 2007
  8. Music

    What musical form preceded the sonata-allegro form, and is the sonata-allegro form still being used today? Sup' Christy, I beleive the form that preceed the sonata-allegro form would be the "minuet and trio" form. Symphonies are where you can find the s-a

    asked on October 16, 2006
  9. physics

    Consider 60 g of hot water at 70 degree C poured into a cavity in a very large block of ice at 0 degree C. A)What will be the final temperature of the water in the cavity? B)Find what mass of ice must melt in order to cool the hot water down to this

    asked on April 3, 2012
  10. physics

    In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific

    asked on March 31, 2012
  11. chemistry

    Copper reacts with nitric acid according to the following reaction: 3 Cu (s) + 8 HNO3 (aq) --> 3 Cu(NO3)2 (aq) + 2 NO (g) + 4 H2O (l) If an pre 1982 copper penny contains 3.10 grams of copper, what volume of 8.00 M nitric acid is required to exactly

    asked on November 7, 2010
  12. Physics

    Two projectiles are launched from ground level at the same angle above the horizontal, and both return to ground level. Projectile A has a launch speed that is twice that of projectile B. (Sketch trajectories of projectiles). Assuming that air resistance

    asked on May 24, 2010
  13. Physics

    Racing on a flat track, a car going 32 m/s rounds a curve 56 m in radius. What is the force of friction needed for the car to round the curve without slipping?

    asked on November 4, 2012
  14. physics

    Two point charges are separated by 6.4 cm. The attractive force between them is 10 N. Suppose that the charges attracting each other have equal magnitude. Rearrange Coulomb's law and find the magnitude of each charge

    asked on April 17, 2012
  15. Chemistry 1

    You carefully weigh out 17.00g of CaCo3 powder and add it to 68.85g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 78.88g . The relevant equation is CaCo3(s)+ 2HCl(aq)--->

    asked on May 30, 2011
  16. Math

    It is greater than 43 and less than 52 if you add the digits the sum is 8 write the number word

    asked on September 27, 2012
  17. Math

    The surface areas of two similar solids are 416yd ^2 and 1,354yd ^2. The volume of the larger solid is 2,976 yd^3. What is the volume of the smaller solid? 2,976 yd ^3 2,619 yd ^3 914 yd ^3 507 yd ^2

    asked on May 25, 2018
  18. English

    The Awakening questions 1. What role or purpose does love have in this book? 2. How does Kate Chopin use other characters, both male and female, in The Awakening in order to illustrate Edna Pontellier’s desires and social limitations? Choose at least

    asked on July 31, 2019
  19. horizon

    What part of speech is the italicized word in the sentence below? What part of speech is the italicized word in the sentence below? Four score and seven years ago, our forefathers brought forth UPON this continent a new nation conceived in liberty and

    asked on June 3, 2013
  20. Geometry-Please Help

    A man has a garden 10 meters square to fence. How many fence posts are needed if each post is 1 meter from the adjacent posts?

    asked on November 14, 2011
  21. physics

    Radioactive decay of granite and other rocks in Earth's interior provides sufficient energy to keep the interior molten, to heat lava, and to provide warmth to natural hot springs. This is due to the average release of about 0.03 J per kilogram each

    asked on April 1, 2012
  22. physics

    A 40g chunk of 90 degree C iron is dropped into a cavity in a very large block of ice at 0 degree C.Find what mass of ice will melt. (The specific heat capacity of iron is 0.11 cal/g degree C)

    asked on April 3, 2012
  23. chemistry

    Assume that you have 2.75 g of the deadly gas hydrogen cyanide,HCN. What is the volume of the gas at STP?

    asked on November 7, 2011
  24. physics

    On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. !!I got

    asked on April 3, 2012
  25. History

    How was the Iroquois league able to survive English and French colonization while the Aztec empire was not able to survive Spanish colonization

    asked on January 30, 2018
  26. Math

    Find each unit rate Julio walks 3 1/2miles in 1 1/4hours

    asked on January 4, 2016
  27. physics

    Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.

    asked on April 1, 2012
  28. chemistry

    How do you calculate the % empty sapce in 100mL of air. Using Avogadro's number(6.02x10^23) and the average volume of O2 and N2(3.8x10^-24 cm3/molecule). I think you can use the ideal gas law but am not really sure how to do it. I also have a similar

    asked on February 4, 2009
  29. math

    The following scores on the midterm exam in Chemistry 102 were recorded, 93 81 59 69 82 73 61 77 95 84 88 71 86 97 63 72 89 80 60 98 91 62 78 83 76 81 94 66 83 96 find the interquartile range. I do not understand this question.

    asked on January 17, 2010
  30. Physics...Friction

    A 75 kg box slides down a 25 degree ramp with an acc. of 3.6 m/s2. find mu,k between the box and the ramp. Write down Newton's second law for the direction of motion. "a" is the acceleration. Mg sin 25 - M g cos 25 *mu,k = M a The first term is the weight

    asked on February 24, 2007
  31. Chemistry Help Please!!!

    A student placed 17.0 g of glucose (C6H1206) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. The flask was then shaken until

    asked on June 4, 2011
  32. Science

    As an environmental science teacher, how would you respond to someone who tells you (a) that he or she does not believe in biological evolution because it is "just a theory," and (be) we should not worry about air pollution because through natural

    asked on February 13, 2007
  33. psychology

    Which of the following is the MOST accurate conclusion one can draw about the mental health field? A) Mental health professionals are gaining respect in society. B) What mental health professionals know and can do outweighs what they do not know and cannot

    asked on December 15, 2014
  34. Physics

    A 50 kg diver steps off a diving board and drops straight down into the water. The water procides an upward average net force of 1500 N. If the diver comes to rest 5m below the water's surface, what is the total distance between the diving board and the

    asked on February 28, 2007
  35. college chem. please help!!

    Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen

    asked on February 3, 2009
  36. Chemistry

    An industrial raw materials as the following composition by mass : iron = 28.1% chlorine = 35.7% and water of crystalization = 36.2%. Calculate the formula for the material given that Hydrogen is 1, oxygen is 16, chlorine is 35.5 and iron is 56.

    asked on January 12, 2019
  37. Chem

    a gas has a volumn of 36.0 L and a pressure of 750 torr when the temperature is 10 degrees celsius. what is the pressure if the volume changes to 78 degrees celsius if the amount of gas stays the same?

    asked on August 24, 2015
  38. Geometry

    A man has a garden 10 meters square to fence. How many fence posts are needed if each post is 1 meter from the adjacent posts?

    asked on November 16, 2011
  39. Math

    How many 1/8 liter glasses of juice can you pour from a 1/2 liter bottle of juice?

    asked on March 2, 2016
  40. English

    Help I don't under stand Spondee, I am supposed to find the spondee in these lines...."Who loved his charge but never loved to lead; One whose meek flock the people loved to be, not lured by any cheat of birth."

    asked on September 26, 2011
  41. math

    There are a total of 107 foreign language students in a high school where they offer only Spanish, French, and German. 42 take Spanish. 46 take French. 45 take German. 8 take Spanish and French but not German. 8 take Spanish and German but no French. 6

    asked on December 15, 2010
  42. psychology

    51. Given the changes in sex-offender laws, the emphasis of concern appears to be swinging toward: A) protecting children. B) sympathizing with sex offenders. C) white Americans. D) states' rights

    asked on December 15, 2014
  43. Mah 157 check answer

    Each letter of the alphabet is written ona separate piece of paper and placed ina box. FInd the probability of now drawing a vowel (a, e, i, o, u) or a letter in the word segments. is is 16/26 or do I need to break it down more ?

    asked on January 17, 2010
  44. Chemistry

    If you have a properly adjusted hot flame, which is pale blue with three distinct comes, what is observed if the GAS CONTROL valve is slightly closed versus what's observed if the AIR CONTROL valve is slightly closed? Please Explain.

    asked on June 12, 2016
  45. physics

    The specific heat capacity of ice is about 0.5 cal/g degree C A)Supposing that it remains at that value all the way to absolute zero, calculate the number of calories it would take to change a 0.50g ice cube at absolute zero (-273 degree C}) to 0.50 g of

    asked on April 3, 2012
  46. physics

    Steel expands 11 parts in a million for each 1 degree C change. Consider a 40,000 km steel pipe that forms a ring to fit snugly all around the circumference of the Earth. Suppose people along its length breathe on it so as to raise its temperature 0.80

    asked on April 3, 2012
  47. Chemistry 1

    What is the chemical equation, name, and formula for the follwing? "When strongly heated, magnesium sulfide formed a yellow crystalline deposit on the walls of a sealed reaction vessel. Metallic deposits were found on the bottom of the container"

    asked on April 29, 2008
  48. vulindlela

    How smoking is a human factor that may cause ill health

    asked on May 22, 2012
  49. math

    How can you tell if a number is rational or irrational? a) 3.215 (there is a line drawn over the 15) b.) square root 10 c) 0.143639854024 d)4.312 can you please explain what i need to look at to tell which is which?

    asked on January 20, 2012
  50. college chemistry

    Calculate the % empty space in 1 mole of water at 25 degree C (d=0.9971g/ml). The volume of a water molecule can be taken as the sum of the volumes of the 2 hydrogen molecules and the oxygen atom. Use the single bonded covalent radii of 37pm for hydrogen

    asked on February 3, 2009
  51. Math

    The chef has 300 pounds of strip sheep. The trim loss on the strip sheep is 40% and the cooking loss is 60% of the trimmed weight. How many pounds of trimmed cooked strip sheep will the chef have left to serve to his customers?

    asked on January 27, 2016

    The rms speed of a sample of gas is increased by 8% . What is the percent change in the temperature of the gas? What is the percent change in the pressure of the gas, assuming its volume is held constant? PLEASE HELP

    asked on December 7, 2010
  53. physics

    An object starts from rest and accelerates at a rate of 2.50 m/s/s for 7.00 seconds. The velocity at the end of the 7.00 seconds is...

    asked on May 22, 2010
  54. penketh high

    Laughing Gas, N2O, is made by the careful decomposition of ammonium nitrate NH4NO3 (s) = N20 (g) + 2H20 (g) How many grams of N2O can you obtain? How many dm3 of stream would also be produced?

    asked on November 18, 2012
  55. physics

    At a certain location, the solar power per unit area reaching Earth's surface is 200 W/m^2, averaged over a 24-hour day.If the average power requirement in your home is 2.8 kW and you can convert solar power to electric power with 8.0 % efficiency, how

    asked on April 3, 2012
  56. Geometry

    A 4-inch-thick concrete slab is being poured for a circular patio 10 feet in diameter. Concrete costs $50 per cubic yard. Find the cost of the concerte, to the nearest cent. Show how you come to your answer.

    asked on November 14, 2011
  57. Math 157

    Based on meteorological records, the probability it will snow in a certain town on January 1st is 0.480. Find the probability that in a given year it will not snow on January 1st in that town? Is the answer 0.520 ?

    asked on January 17, 2010
  58. Physical Science

    Aluminum has a density of 2.70 g/cm^3. What is the mass of a piece of aluminum that has a volume of 100.0cm^3? How would I figure this out? Thanks so much. :)

    asked on October 5, 2009
  59. physics

    At a certain location, the solar power per unit area reaching Earth's surface is 200 W/m^2, averaged over a 24-hour day.If the average power requirement in your home is 2.8 kW and you can convert solar power to electric power with 8.0 % efficiency, how

    asked on April 4, 2012
  60. biology

    Which of the following problems do immigration and emigration pose for demographers?

    asked on September 13, 2010
  61. Math-which is correct

    1 euro is worth 1.2 U.S dollars if I budget 150$ per night for a hotel room. What is the maximum number of euros I should spend for a room? My answer is 108 euros as a maximum (with an actual number of 107.425) Correct??? * Math-check my answer - DrBob222,

    asked on September 15, 2009
  62. physics

    In lab, Will burns a 0.6 g peanut beneath 48 g of water, which increases in temperature from 22 degree C to 55 degree C. The amount of heat absorbed by the water can be found with the equation Q =cm \Delta T, where Q is the amount of heat, c the specific

    asked on April 3, 2012
  63. Math

    A serving of ice cream contains 5000 calories. 200 calories come from fat. What percent of the total calories come from fat?

    asked on January 27, 2016
  64. Chemistry

    Explain the laboratory preparation of one Litre of 1.3M formic acid buffer of pH 3.9 from solid sodium formate (molecular weight =68) and formic acid liquid 30% pure (Density of formic acid = 1.029g/ml, pKa = 3.75)

    asked on September 17, 2015
  65. physics

    Which of these is the same in identical branches of a parallel circuit? A) All of these.B) Voltage.C) Current.D) None of theseE) Resistance. again my textbook says that voltage is the one that the paths are the same,is it all of these?

    asked on April 14, 2012
  66. physics

    A mountain-climber friend with a mass of 82 kg ponders the idea of attaching a helium-filled balloon to himself to effectively reduce his weight by 25% when he climbs. He wonders what the approximate size of such a balloon would be. Hearing of your physics

    asked on April 1, 2012
  67. Geometry

    A man has a garden 10 meters square to fence. How many fence posts are needed if each post is 1 meter from the adjacent posts? Question says to show work.

    asked on November 14, 2011
  68. math

    The number which best completes the sequence below is: 10 8 7 14 15 13 12 24 25

    asked on January 12, 2009
  69. social studies

    What are mummy-shaped figures that worked in the afterlife's fields for the mummy?

    asked on February 7, 2008
  70. geometry

    Pqrs -jklm with a scale factor of 4:3qr-8cm what is the value of kl

    asked on December 6, 2012
  71. physics

    A copper of mass 400g is heated until it's temperature becomes 250degree celcius. It is dropped into water weighing 200g at 50 degree celcius.calculate the mass of water vapour produced.

    asked on February 24, 2016
  72. physics

    The lowest resistance in a common electric circuit containing a common lamp is in which of these A) connecting wires.B) Both of these.C) Neither of these.D) lamp filament. I would say lamp filament is this correct?

    asked on April 14, 2012
  73. Probability

    A card is drawn from a standard deck of cards. Find P(A U B) in each part. A= {getting a heart}, B= {getting an even number} A= {getting a club}, B= {getting a red card} A= {getting an ace}, B= getting a black card} A= {getting a prime}, B= {getting a

    asked on February 15, 2012
  74. Algebra 2

    Story problems are my favorite. However, I can not figure this one out. THe stopping distance d of a car after the breaks are applied varies directly as the square of the speed r. If a car traveling at 70mph can stop in 270 ft. How many feet will it take

    asked on August 3, 2010
  75. Statistics

    Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). Bellevue Hospital in New York City uses 100.6 °F as the

    asked on July 15, 2010
  76. Math, check my answer. thanks

    Consider the following students’ methods of solving the Proportion 8/5 = 20/x and determine whether the methods were correct: Richie: First I divided 20 by 8 and got 2 1/2 Then I multiplied by 5 and got 12 ½ for my answer. Martha: I think of it this

    asked on September 15, 2009
  77. Science

    Distinguish between high-quality energy and low-quality energy, and give an example of each. Relate these terms to energy efficiency. Frankly, these terms could mean anything. In my electrical engineering career, high quality energy was a high thermal

    asked on February 9, 2007
  78. physics

    Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the electric force between them, which I solved for 3.6 N. I am stuck on the next part: What would be the mass of an object that would

    asked on April 17, 2012
  79. Statistics

    1. For the following exercise, complete the following: a. Find the mean, median, and range for each of the two data sets. b. Find the standard deviation using the rule of thumb for each of the data sets. c. Compare the two sets and describe what you

    asked on July 16, 2010
  80. science

    After reading about the Malaria problem in North Borneo and the subsequent attempts to eliminate it, do you believe the beneficial effects of spraying pesticides on Sabah outweighed the resulting unexpected and harmful effects? What do YOU believe? If

    asked on July 3, 2007
  81. algebra (check answer)

    Sue can shovel snow from her driveway in 35 minutes. Bill can do the same job in 50 minutes. How long will it take Sue and Bill to shovel the driveway if they worked together. (1/35) + (1/50) T T=1 (1/35) + (1/50)= Is the answer: 21.25

    asked on August 5, 2010
  82. physics

    Consider an airplane with a total wing surface of 90 m^2. At a certain speed the difference in air pressure below and above the wings is 4.2% of atmospheric pressure. Find the lift on the airplane.

    asked on March 31, 2012
  83. Geometry

    How many pieces of square floor tile, 1 foot on a side, would you have to buy to tile a floor that is 11 feet 6 inches by 8 feet?

    asked on November 14, 2011
  84. english

    Students who do their homework on a regular basis have grades higher than students who don’t do homework. When students do not do their homework they fall behind in the class and eventually receive a zero on that paper, this results in dropping their

    asked on January 25, 2011
  85. english

    Hello - I am not sure you can help me ...I have to write an essay which I did for an english class which I already did, but I was wondering if you know of any free websites that can proof read my work? Just thought I would ask :)

    asked on January 16, 2008
  86. physics

    The key ingredient in anything magnetic is which of the following?. A) moving electric charge.B) magnetic domains that are aligned C) pairs of magnetic poles.D) the surrounding magnetic field.E) magnetic polarization.

    asked on April 14, 2012
  87. Physics

    if a baseball is thrown 30 m/s backwards from a truck moving 50 m/s, how fast will the ball strike the glove of a ground based catcher?

    asked on November 30, 2011
  88. algebra

    If you have a^ + b^= (a+b)(a+b). Is this always true, never true, or sometimes true? Explain.

    asked on November 2, 2011
  89. math

    Identify the following amounts. 1. "Decidollar" 2. "Centidollar" 3. "Dekadollar 4. "kilodollar"

    asked on October 15, 2011
  90. Physics

    I never learned how to do these... An electron moves from one plate of a capaci- tor to another, through a potential difference of 2495 V. a) Find the speed with which the electron strikes the positive plate. Answer in units of m/s. If a proton moves from

    asked on February 16, 2010
  91. math check answer

    If a student is selected at random, what is the probability he or she prefers meat toppings ? 68 students prefer cheese 79 students prefer meat 70 students prefer veggie 70/208, 35/104 or 1/3 is that correct

    asked on January 17, 2010
  92. physics

    Electric current is a flow of electric charge that moves due to an electric pressure is called what?. A) wattage.B) voltage.C) All of these to some degree.D) None of these.E) amperage. I chose ampere, this is what my textbook tells me and I got it wrong

    asked on April 14, 2012
  93. statistics

    For a particular sample of 80 scores on a psychology exam, the following results were obtained. First quartile = 65 Third quartile = 98 Standard deviation = 8 Range = 56 Mean = 83 Median = 81 Mode = 59 Midrange = 64 Answer each of the following: I. What

    asked on February 2, 2012
  94. physics

    Your electronic friend needs a 20 ohms resistor but has only 40 ohms resistor. He tells you that he can combine them to produce a 20 ohms resistor? How?

    asked on September 8, 2010
  95. Statistics

    Which of the following statements are correct? 1.A normal distribution is any distribution that is not unusual. 2.The graph of a normal distribution is bell-shaped. 3.If a population has a normal distribution, the mean and the median are not equal. 4.The

    asked on July 14, 2010
  96. college english

    Please help revise !! thank u sooo much!! Direct military action against Iran would only agitate the Middle East particularly Islamic governed countries. Disturbing this region would damage America’s interest towards the fight against terrorism.

    asked on February 18, 2010
  97. science

    which gas shows the greatest difference in percent between inhaled and exhaled air?

    asked on January 22, 2010
  98. please revise

    It is ordinarily accepted among nations that territorial jurisdiction is based on a crime that is committed within the territory of the sovereign state. However, sometimes states also exercise jurisdiction because the crime was committed abroad by one of

    asked on April 28, 2008
  99. English/ please revise

    The issue arising out of the Yunis case is the concern over the authority of the United States statues permitting extraterritorial jurisdiction and application of the United States constitution to aliens. Thus, Yunis argued that under general principles of

    asked on April 9, 2008
  100. Science

    What steps do you think can be taken to reduce the harmful effects of human activities on biogeochemical cycles? Which businesses would these changes impact the most? I think that human activities are having harmful and large-scale effects on the

    asked on December 7, 2006


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