Popular questions and responses by eric
  1. chemistry

    Assuming equal concentrations, rank these aqueous solutions by their freezing point.? K2CO3, Li3PO4, Sn(ClO3)4, NH4I I tried to rank them according to the number of ions but i can't get it. highest freezing point --> lowest freezing point Sn(ClO3)4 ->

    asked on February 19, 2012
  2. Chem HELP!!

    Which one of the following sets of quantum numbers can correctly represent a 3p orbital? a) (n = 3 l = 1, ml = 2) b)(n = 1, l = 3, ml = 3) c) (n = 3, l = 2, ml = 1) d) (n = 3, l = 1, ml = -1) e) (n = 3, l = 0, ml = 1)

    asked on October 5, 2014
  3. Physics

    The components of vector A⃗ are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A⃗ ?

    asked on September 11, 2015
  4. Physics

    A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of vx and vy, the x- and y-components of the puck’s velocity. The puck starts at the origin. The graph of the X-velocity is v=8t cm/s and the

    asked on September 11, 2015
  5. statistics

    Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 541 and a standard deviation of 101. Use the 68-95-99.7 Rule to find the percentage of people taking the test who score between 238 and 844 The percentage of

    asked on December 8, 2016
  6. physics

    The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 280 g of hot coffee initially at 90.0°C if 2.50 g evaporates from it? The coffee is in

    asked on July 21, 2013
  7. chemistry

    A 141-mg sample was placed on a watch glass that weighed 9.203 g. What is the weight of the watch glass and sample in grams?

    asked on January 31, 2012
  8. physics

    The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.25 kcal of heat enters 1.25 kg of the following, originally at 20.0°C. (a) water (b) concrete (c)

    asked on July 19, 2013
  9. Spanish

    Are these correct? I. Rewrite each sentence by replacing the direct object in quotation marks with a direct object pronoun [me, te, lo, la, nos, los, las]. Ejemplo: No conozco "al jefe del departamento." --> No lo conozco. 1. Esa compañía vende "casas

    asked on January 23, 2014
  10. physics

    Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 30.0 N, what is the temperature increase? The

    asked on July 19, 2013
  11. Physics

    A massive steel cable drags a 20kg block across a horizontal, frictionless surface. A 100N force applied to the cable causes the block to reach a speed of 4.2m/s in a distance of 2.1m . What is the mass of the cable?

    asked on May 30, 2015
  12. physics

    A firefighter a distance d from a burning building directs a stream of water from a fire hose at angle θi above the horizontal as in the figure. If the initial speed of the stream is vi, at what height h does the water strike the building? (Use theta for

    asked on February 18, 2011
  13. chemistry

    Complete combustion of a 0.40-mol sample of a hydrocarbon, CxHy, gives 2.40 mol of CO2 and 1.60 mol of H2O. The molecular formula of the original hydrocarbon is Group of answer choices C2H8. C6H8. C9H16. C5H5. C4H7.

    asked on January 21, 2020
  14. Chemistry

    When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 26.4 g of carbon were burned in the presence of 82.1 g of oxygen, 11.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced? Express your answer to one

    asked on September 14, 2016
  15. Spanish

    Is this correct? Complete the paragraph with the correct present-tense form of the most logical verb from the list below. Each verb will be used no more than once, and don’t forget the reflexive pronouns when appropriate. acostarse bañarse deletrear

    asked on February 10, 2014
  16. physics 11

    A swimmer swims perpendicular to the bank of a 20.0 m wide river at a velocity of 1.3 m/s. Suppose the river has a current of 2.7 m/s [W]. (a) How long does it take the swimmer to reach the other shore? (b) How far downstream does the swimmer land from his

    asked on October 20, 2015
  17. Physics-Trajectory

    A particle's trajectory is described by x =(12t3−2t2)m and y =(12t2−2t)m, where t is in s. What is the particle's speed at t=0s ? What is the particle's speed at t=5.0s ? Express your answer using two significant figures. What is the particle's

    asked on September 11, 2015
  18. Physics

    A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fourth its original speed. What is the mass of the second ball?

    asked on December 10, 2009
  19. Physics

    A diagnostic sonogram produces a picture of internal organs by passing ultrasound through the tissue. In one application, it is used to find the size, location, and shape of the prostate in preparation for surgery or other treatment. The speed of sound in

    asked on November 2, 2019
  20. physics

    A certain heat engine does 8.0 kJ of work and dissipates 8.00 kJ of waste heat in a cyclical process. (a) What was the heat input to this engine? (b) What was its efficiency?

    asked on July 24, 2013
  21. Economics

    The well known nationally syndicated columnist David Broder reported the recent findings of two academic political scientists. These scholars found that voters are quite turned off by negative campaigns of politicians. Many people went as far as not voting

    asked on July 15, 2013
  22. Physics

    Three forces are exerted on an object placed on a tilted floor. Forces are vectors. The three forces are directed as shown in the figure. If the forces have magnitudes F1 = 2.0 N, F2 = 17.0 N and F3 = 15.0 N, where N is the standard unit of force, what is

    asked on September 11, 2015
  23. Economics

    When McDonald’s Corp. reduced the price of its Big Mac by 75 percent if customers also purchased french fries and a soft drink, The Wall Street Journal reported that the company was hoping the novel promotion would revive its U. S. sales growth. It

    asked on July 15, 2013
  24. Economics

    1. An economy's production possibilities frontier is also its consumption possibilities frontier. a. under all circumstances b. under no circumstances c. when the economy is self-sufficient d. when the rate of tradeoff between the two goods being produced

    asked on September 9, 2012
  25. ChemII

    A saline solution is 0.9% NaCl. What masses of NaCl and water would be required to prepare 50. L of this saline solution? Assume that the density of water is 1.000g/mL and that the NaCl does not add to the volume of the solution.

    asked on January 9, 2011
  26. math

    Mrs. Bollo's second grade class of thirty students conducted a pet ownership survey. Results of the survey indicate that 8 students own a cat, 15 students own a dog, and 5 students own both a cat and a dog. How many of the students surveyed own no cats?

    asked on November 28, 2010
  27. math, economics, game theory

    Two people have 10 dollars to divide between themselves. they use the following procedure. each person names a number of dollars (nonnegative integer), at most equal to 10. IF the sum of the amounts that the people name exceeds 10 and the amounts named are

    asked on September 10, 2007
  28. chemistry help~Please!!!

    What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!

    asked on April 11, 2014
  29. math

    Evaluate the expression 8a + b for the given variable. b = 3a – 2

    asked on April 30, 2012
  30. Math

    Simplify (Log75+log9+log5)÷(log5+log45)

    asked on November 10, 2016
  31. Spanish

    Are these correct? Thank you for helping Finish the following sentences including at least one possessive adjective (mi[s], tu[s], su[s], nuestro[s] or nuestra[s]) in your answer. Ejemplo: La profesora que tiene mi amiga es antipática, pero "mis

    asked on January 24, 2014
  32. physics

    In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat

    asked on July 20, 2013
  33. math

    A company made $4 million in the second quarter. This is 1/3 more than it made in the first quarter and 4/5 of what it made in the third quarter. How much did the company make in the three quarters combined?

    asked on September 19, 2011
  34. physics

    A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle

    asked on February 18, 2011
  35. french

    how do you conjugate aimer mieux? do you just conjugate the aimer part?

    asked on February 9, 2008
  36. Chemistry

    In a constant-pressure calorimeter, 50.0 mL of 0.300 M Ba(OH)2 was added to 50.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 24.50 degrees C to 28.59 degrees C. If the solution has the same density and specific heat

    asked on February 10, 2012
  37. Math

    You survey 1000 new home buyers and find that the mean price was $185,000 and the standard deviation was $20,000. How many paid more than $210,000?

    asked on December 5, 2017
  38. Math

    The 3rd and 7th terms of an A.P are -1 and 11 respectively. Fine the nth term and the numbers of which must be added to get a sum of 430

    asked on September 20, 2017
  39. Physics

    A circus cat has been trained to leap off a 12-m-high platform and land on a pillow. The cat leaps off at v0 = 3.6 m/s and an angle θ = 37°

    asked on February 6, 2017
  40. Math

    How many inches represent 1 mile. Help 3/10 in = 7/8 mile

    asked on December 8, 2016
  41. Algebra

    Given that xy = 3/2 and both x and y are nonnegative real numbers, find the minimum value of 10x + 3y/5

    asked on August 22, 2014
  42. math

    a brick is placed on a balance balances exactly with a 3/4 pound weight and 3/4 of a brick .what is the weight of the brick? show and explain work

    asked on November 11, 2013
  43. Chemistry

    A solution is made by dissolving 0.500 mol of HF in enough water to make 1.00 L of solution. At 21 C, the osmotic pressure of the solution is 1.35 atm. What is the percent ionization of this acid? This is what i did.. is it correct? (1.35 atm) =

    asked on February 19, 2012
  44. Math

    Ann, Mara, Jenny, Tina, and Sue are sisters. Two of the five sisters must help their father at this business each Saturday. How many combinations of two sisters are possible?

    asked on September 13, 2011
  45. physics

    A dive bomber has a velocity of 235 m/s at an angle θ below the horizontal. When the altitude of the aircraft is 2.15 km, it releases a bomb, which subsequently hits a target on the ground. The magnitude of the displacement from the point of release of

    asked on February 18, 2011
  46. Organic Chem

    A 20 g mixture containing 95% (by weight) of A and 5% of B is recrystallized in toluene (b.p. 110 C). Solubility for compound A is 1.5 g @20 degrees and 10 g @ 110 degrees. For compound B solubility is 0.5 g @20 degrees and 8 g @ 110 degrees. What amount

    asked on October 5, 2010
  47. college

    Two point charges have a total charge of 505 µC. When placed 1.10 m apart, the force each exerts on the other is 19.3 N and is repulsive. What is the charge on each? (Round your answers to the nearest µC.)

    asked on August 29, 2010
  48. Chemistry

    You have a 22L cylinder of helium at a pressure of 150atm and a temperature of 31C. How many ballons can you fill, each with a volume of 5.0L, on a day when the atmospheric pressure is 755mmHg and the temperature is 22C? I know I use PV=nRT, but what

    asked on September 27, 2009
  49. Educational Technology and Online Learning

    what is the purpose of the introduction in an expository essay

    asked on September 14, 2016
  50. Statistics/probability

    You are considering two mutual funds for your investment. The possible returns for the funds are dependent on the state of the economy and are given in the accompanying table. State of the Economy Fund A Fund B Good 20% 40% Fair 10% 20% Poor -10% -40% You

    asked on September 13, 2015
  51. physics

    a 65kg person dives into the water from the 10m platform. she comes to a stop 2m below the surface of the water. what net force did the water exert on the swimmer? so for the net force i got -2548N i know: vf^2=vi^2 + 2ad vf^2 = 0 + 2(9.8)(10) vf^2 = 196

    asked on February 6, 2014
  52. Spanish

    Are these correct? Answer the following questions using the present progressive. Be sure to answer with the same verb that is used in each question. 1. Creo que Xavier (1) _____ (2) __________ en la casa de sus padres mientras asiste a la Universidad.

    asked on January 29, 2014
  53. physics

    The engine of a large ship does 2.05 multiplied by 108 J of work with an efficiency of 4.00%. (a) How much waste heat (J) is produced? (b) How many barrels of fuel are consumed, if each barrel produces 6.00 multiplied by 109 J of heat when burned?

    asked on July 24, 2013
  54. Economics

    Thomas Schelling, an expert on nuclear strategy and arms control, observed in his book The Strategy of Conflict (Cambridge, MA: Harvard University Press, 1960), "The power to constrain an adversary depends upon the power to bind oneself." Explain this

    asked on July 15, 2013
  55. AP Chemistry

    The molar heat of fusion for water is 6.01 kJ/mol. The heat capacity for water is 75 J/mol deg. Which expression gives the quantity of energy need to change 1.0 mol ice at 0C to liquid water at 25C? A. 6010/(75x25) B. 6.01+75 C. 6010+(75x25) D.

    asked on September 23, 2012
  56. Chemistry

    The vapor pressure, P, of a certain liquid was measured at two temperatures, T. Represented in a table: T (in Kelvin) ------- P(in kPa) [325] --------------- [4.00] [775] --------------- [8.59] What is the enthalpy of vaporization for this liquid? (Delta H

    asked on January 23, 2012
  57. College Physics

    A concept question: Suppose that the centripetal force acting on an object in circular motion were increased to a new value, and the object remained in circular path with the same radius. How would its motion be affected?

    asked on September 30, 2010
  58. Chemistry

    How many calories are required at 0 degrees C to melt an ice cube with a mass of 25g? I got 2000 cal. Could you tell me if this is right?

    asked on September 18, 2010
  59. english

    which is correct? a couple billions of dollar or a couple billion of dollars

    asked on February 10, 2008
  60. Math

    How many integers m are there such that 0

    asked on March 17, 2020
  61. Algebra

    21. simplify (2sqrt5+3sqrt7)^2 show your work. Been confused on it for a while.

    asked on May 8, 2017
  62. Algebra

    I have answered the question but not sure how to check for extraneous solution. x/(5x+4)=3 The answer is -6/7

    asked on February 8, 2017
  63. Calculus

    Evaluate the definite integral (low) (high) -π/6 ∫ π/6 2sec(x)tan(x) dx

    asked on November 16, 2016
  64. math

    in which stem do most of the data fall 1 ,2 3, or 4

    asked on October 6, 2016
  65. Math

    An enclosed rectangular garden is 6 meters by 15 meters. Additional fencing within the garden can divide it into three smaller plots, two of them square and one rectangular. What is the least number of meters of additional fencing that is needed?

    asked on January 28, 2016
  66. geometry

    Given: AC perpendicular BD and AB congruent CB. Prove AD congruent CD. It is a kite figure. I need statements and reasons. Problem states Plan: prove triangle ABE congruent CBE. The use congruent corresponding parts AE and CE to show right triangle AED

    asked on April 10, 2015
  67. Cultural Anthropology

    how are traditional anthropological fieldwork techniques used in applied anthropology? How does applied anthropology benefit modern social problems? Thank you!

    asked on April 11, 2014
  68. physics

    A hot air balloon is ascending straight up at a constant speed of 6.50 m/s. When the balloon is 13.0 m above the ground, a gun fires a pellet straight up from ground level with an initial speed of 34.0 m/s. Along the paths of the balloon and the pellet,

    asked on September 10, 2013
  69. physics

    The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer

    asked on July 20, 2013
  70. English IV

    Score: "I always lie" is an example of which of these literary devices? A)paradigm B)paradox C)metaphor D)personification E)none of these

    asked on May 23, 2013
  71. Math

    A class has 27 students. Fifteen are boys and the rest are girls. What is the ratio of girls to total students? 12 : 15 15 : 12 27 : 12 12 : 27

    asked on November 20, 2012
  72. english

    chick: a young woman A. direct definition B. indirect definition a

    asked on February 18, 2012
  73. Chemistry

    The specific heat of a certain type of metal is 0.128 J/(g-c). What is the final temperature if 305 J of heat is added to 86.9 g of this metal initially at 20 degrees C? Tfinal = ___ C

    asked on February 8, 2012
  74. Math

    Professor Sousa has 83 students in her anthropology lecture class. 42 of the students are sophomores and the others are juniors. What fraction of the class is sophomores?

    asked on February 2, 2012
  75. Physics

    You and your friend are practicing pass plays with a football. You throw the football at a 35.0° angle above the horizontal at 19.0 m/s. Your friend starts right next to you, and he moves down the field directly away from you at 5.50 m/s. How long after

    asked on September 30, 2011
  76. english

    Identify the noun clause in the following sentence: What they should do is hire a tutor who can help them with their math skills.

    asked on July 25, 2011
  77. physics

    What must be the radius of a 4 kg circular disk if it is to have the same moment of inertia as a 1 kg rod 1 M long and pivoted at its midpoint?

    asked on May 15, 2011
  78. accouting

    Nancy Company has budgeted sales of $300,000 with the following budgeted costs: Direct materials $60,000 Direct manufacturing labor 40,000 Factory overhead Variable 30,000 Fixed 50,000 Selling and administrative expenses Variable 20,000 Fixed 30,000

    asked on April 2, 2011
  79. math

    Determine the sum of the following angles: 13° 31' 27" , 64° 12' 48"

    asked on March 24, 2011
  80. physics

    One side of the roof of a building slopes up at 35.5°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up the incline. The coefficient of kinetic friction between the plastic and the

    asked on February 24, 2011
  81. physics

    A projectile is fired in such a way that its horizontal range is equal to 8.5 times its maximum height. What is the angle of projection?

    asked on February 18, 2011
  82. Chemistry

    You have a 22L cylinder of helium at a pressure of 150atm and a temperature of 31C. How many ballons can you fill, each with a volume of 5.0L, on a day when the atmospheric pressure is 755mmHg and the temperature is 22C?

    asked on September 27, 2009
  83. french

    What does it mean...Je te deteste. Why is the te there? Another one is je t'adore?

    asked on January 26, 2008
  84. Math

    How many subsets of a set with 100 elements have more than one element? The answer to your question is the number of all of the subsets minus the number of subsets with just one element. had do you find the perimeter and the area whats the measurment of b

    asked on March 8, 2007
  85. Physics

    Will kinetic energy equal potential energy at the amplitude?

    asked on October 27, 2019
  86. Further mathematics

    Find the first bank term of a linear sequence is 3 and the 8th term is 3.1.find the common difference

    asked on January 17, 2019
  87. Physics

    Determine the indicator horse power and piston displacement of a machine of the piston area 100m^2 given the piston stroke to be 600cm and indicating mean pressure to be 500kg/m^2. The number of piston stroke per minute is 4

    asked on November 4, 2018
  88. Physics

    A man using 80kg garden tractor on a level surface exert a force of 50N at 65^0 to the ground. Find the vertical force of the garden tractor on the ground

    asked on November 4, 2018
  89. Law

    The tort law in America started with the concept of a. Assault b. Battery c. Trespass^^^ d. Murder Is C correct?

    asked on September 24, 2018
  90. Algebra

    Let f(x)=8 (3)^ x−2 +2 . The graph of f(x) is stretched vertically by a factor of 3 to form the graph of g(x) . What is the equation of g(x) ? g(x) =

    asked on May 12, 2017
  91. Science

    What is the mechanical advantage of a machine that used 600N to overcome a load of 1200

    asked on April 8, 2017
  92. Math

    Sam is hoisting an engine form a pickup truck he is fixing. He hands hoist using 3 rafters on ceiling. Measures the angle the hoist makes at the baseto be 85 degrees and the length across the of chain across rafters to be 80 inches. One length of chain

    asked on January 17, 2017
  93. Calculus

    Find the value(s) of c guaranteed by the Mean Value Theorem for Integrals for the function over the given interval. f(x) = 4√x [4, 9]

    asked on November 15, 2016
  94. Calc

    Find the critical numbers of the functions. f(0) = 2sec0 +tan0 on the interval [0,2pi]

    asked on November 15, 2016
  95. Chemistry

    Using the equation: 2C2H6 + 7O2--> 4CO2 + 6H20 How many moles of CO2 are produced by the reaction of 21.0 mol O2? Again, not sure how to write it correctly, but if I multiply 7O2 by 3, then I should do the same to the other side of the equation to make it

    asked on February 19, 2016
  96. math

    A pair of dice is rolled.What is the probability that the sum of the pips is either an even number on a multiple of 3? total number of space is 36.

    asked on February 4, 2016
  97. Algebra 2

    For the function f(x)=square root 3x-2 find the value of the expression below. What value of x makes f(x)=6

    asked on October 11, 2015
  98. Physics

    Basically... distance is 4 km Takes 4 min to go down river Takes 6 min to come up How fast is the river?

    asked on September 22, 2015
  99. Math

    Nell made a pizza. she cut the pizza into fourths. then she cut each fourth. nell and her friens ate 6 of the smaller pieces of the pizza. What fraction of the pizza did Nell and her friends eat? What fraction of the pizza did Nell and friends Not eat?

    asked on December 4, 2014
  100. calculus

    updating previous question so easier to understand im using chain rule to answer this question: f(x) = -5 sqrt(x^2 - 4x + 1) what is f'(x)? tried to use calculator to get the answer to base my answer off of but this is a nonreal number. does this mean i

    asked on January 8, 2014


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