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. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  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. 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
  14. 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
  15. 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
  16. Math

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

    asked on November 10, 2016
  17. 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
  18. 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
  19. 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
  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. 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
  22. 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
  23. 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
  24. 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
  25. chemistry help~Please!!!

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

    asked on April 11, 2014
  26. 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
  27. physics

    A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 31.0 cm. (a) How much work (J) do you do in one stroke if the average gauge pressure is 2.40 multiplied by 105 N/m2 (about 35 psi)? (You may consider this an isothermal process.)

    asked on July 24, 2013
  28. english

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

    asked on February 10, 2008
  29. 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
  30. 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
  31. Math

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

    asked on December 8, 2016
  32. 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
  33. 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
  34. 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
  35. 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
  36. math

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

    asked on March 24, 2011
  37. 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
  38. math

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

    asked on April 30, 2012
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. Math

    Which of the images above represents a proof of the Pythagorean Theorem? Explain your choice, and then explain how the figure proves the Pythagorean Theorem.

    asked on November 19, 2012
  47. 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
  48. physics

    In a local bar, a customer slides an empty beer mug down the counter for a refill. The bartender is momentarily distracted and does not see the mug, which slides off the counter and strikes the floor at distance d from the base of the counter. The height

    asked on February 18, 2011
  49. 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
  50. geometry

    M angle lmn =6x-20 howdo i find out what x is

    asked on October 3, 2010
  51. french

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

    asked on February 9, 2008
  52. 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
  53. 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
  54. 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
  55. math

    Isaiah and Andy had a total of 560 trading cards. After Isaiah gave1/9 of cards to Andy they had an equal # of trading cards. How many more cards did isiah have than Andy at the beginning?

    asked on February 22, 2015
  56. 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
  57. 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
  58. 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
  59. 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
  60. 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
  61. 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
  62. calculus-extrema

    Find and classify the relative maxima and minima of this function f(x)= definite integral sign where a=0 and b=x. t^2-4/(1+(cos^2(t)) dt what should my value for u be? is it just t. not sure how to even tackle this problem.

    asked on May 15, 2013
  63. english

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

    asked on February 18, 2012
  64. 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
  65. social studies

    explain whether you think it is better for the country to have a policy of isolationism or one of imperialism. help meee its a study question for tommorrows test i need to know the answer!

    asked on November 13, 2011
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. Yoku

    A prism has total surface area of 360 m2 and volume of 60 m3. If the length, width, and height are reduced to half their original sizes, what will be the following?

    asked on March 15, 2010
  72. social

    The direct approach for delivering bad news is best for persons who A) you do not know well. B) prefer straightforward messages. C) are unfamiliar with your company. D) All of these. im not sure if the direct approach is based on people knowing each other

    asked on October 6, 2009
  73. 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
  74. math


    asked on March 4, 2008
  75. french

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

    asked on January 26, 2008
  76. AP Chemistry

    I need alot of help on this problem, it is due WEDNESDAY and I have no clue how to do it Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of

    asked on January 21, 2008
  77. english

    i need vocab words for call of the wild

    asked on August 30, 2007
  78. 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
  79. 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
  80. 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
  81. 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
  82. Algebra

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

    asked on May 8, 2017
  83. Statistic

    At peak periods 15 of attempted logins to an email service fail. log-in attempts are independent and each has the name probability of failing. Ann logs in repeatedly until she succeeds A. Find the probability that Ann needs to log in atleast four times

    asked on April 11, 2017
  84. 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
  85. Calculus

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

    asked on November 16, 2016
  86. 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
  87. Calc

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

    asked on November 15, 2016
  88. math

    The ratio of two numbers is 3:5, the smallest number is 45 what is the larger number?

    asked on October 18, 2016
  89. math

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

    asked on October 6, 2016
  90. art

    this piece of art primarily represents art that

    asked on October 6, 2016
  91. Educational Technology and Online Learning

    what is the purpose of the introduction in an expository essay

    asked on September 14, 2016
  92. 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
  93. 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
  94. Physics

    Three positive point charges are located at the corners of a rectangle. Find the electric field at the fourth corner if q1 = 5 nC, q2 = 6 nC, and q3 = 7 nC. The distances are d1 = 0.6 m and d2 = 0.2 m. (Let the positive x-direction be to the right, and the

    asked on January 18, 2016
  95. 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
  96. 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
  97. 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
  98. 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
  99. 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
  100. Physicsl

    What is the magnitude of the electric field a distance 3.5mm from an electron?

    asked on April 5, 2015


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