Popular questions and responses by lucy
  1. physics

    A 0.50 kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise ?

    asked on April 30, 2011
  2. science

    if 8.100 grams of C6H6 is burned and heat is produced from the burning is added to 5691 grams of water at 21 degrees celsius what is the final temp of the water? 2C6H6+15O2=12CO2+6H2O+6524kj

    asked on October 17, 2013
  3. Chemistry

    A model rocket is launched straight upward with an initial speed of 45.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 160 m. A. what is the max height reached by the rocket? B. How long after

    asked on September 10, 2017
  4. Physics

    A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58◦ above the horizontal. The top of the fence is 10m

    asked on September 9, 2015
  5. Life orientation

    discuss the contributing factors that lead to this issue

    asked on May 10, 2016
  6. Algebra II

    Use log5(2)=0.4307 and log5(3)=0.6826 to approximate the value of log5=54. According to the example in my book I would divide 0.6826 by 0.4307 and the answer is 1.5848 but this is not one of the answers given. My choices are: a) 0.1370 b) 2.4785 c) 0.8820

    asked on March 29, 2008
  7. Spanish 2 Present Subjunctive

    Please check my answers. I know I'm missing accents. 1. Os recomienda que ___ otra llave de recepcion. a) pedis b) pidais*** c) piden d) pida 2. Which of the following sentences is correct? a) Es importante tu estudies mucho. b) Es necesario que hacer

    asked on December 6, 2016
  8. Spanish

    Which sentence correctly substitutes the bolded phrase? Carla compro /los anteojos de sol./ Carla las compro Carla lo compro Carla los compro Carla la compro I'm confused because it's los anteojos but I thought los was part of it, and that it doesn't make

    asked on November 1, 2015
  9. Maths

    A true/ false test is given. If a person guesses the answers, the probability that any particular question is correctly answered is 0.5. If the test contains 14 questions and 7 correct answers is a pass, what is the probability of passing the test by

    asked on February 13, 2014
  10. chemistry

    Based on a Ksp experiment, describe a way to soften water by removing calcium ions. What would be the advantages and disadvantages of your method?

    asked on April 12, 2009
  11. Algebra

    Among all pairs of numbers with a sum of 34, find the pair whose product is maximum. Write your answers as fractions reduced to lowest terms.

    asked on October 9, 2015
  12. AP Language-Inductive/Deductive

    These are pretty hard, at least to me. Please help me check my answers. 1. Most luxuries, and the so-called comforts of life, are not only indispensable, but positive hinderances to the elevation of mankind. With respects to luxuries and comforts, the

    asked on December 8, 2016
  13. College Algebra

    The area of a rectangular wall of a barn is 24 square feet. Its length is 8 feet longer than twice its width. Find the length and width of the wall of the barn

    asked on August 15, 2012
  14. Pre-Calculus

    Consider a class with 10 sophomores, 8 juniors, and 6 seniors. Two students are selected at random. 1) What is the probability of selecting 1 junior and 1 senior. 2) Find the odds of selecting two students who are not seniors. How do I set these up to

    asked on September 14, 2008
  15. statistics

    The number of pizzas consumed per month by university students is normally distributed with a mean of 9 and a standard deviation of 5. What is the probability that in a random sample of size 10, a total of more than 80 pizzas are consumed? (Hint: What is

    asked on March 25, 2012
  16. Chemistry

    Write the net ionic equation for the reaction between sulfuric acid and potassium hydroxide. I got 2H^+ + 2OH^-1 ==> 2H2O. Is this correct?? Thanks.

    asked on December 2, 2007
  17. Algebra

    A rectangular auditorium seats 1960 people. The number of seats in each row exceeds the number of rows by 9. Find the number of seats in each row. Thanks!

    asked on October 6, 2015
  18. Chemistry

    What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

    asked on November 18, 2007
  19. Social Studies

    1.Which is a source of political conflict between China, Japan, and South Korea today? A. trade barriers B. nuclear weapons development C. land claims in the South China Sea D. economic sanctions

    asked on October 3, 2019
  20. Chemistry

    Calculate the enthalpy change for the reaction 2C (s) + H2 (g) yield C2H2 (g) given the following reactions and their respective enthalpy changes: C2H2(g) + 5/2 O2(g) yield 2CO2(g) + H2O (l) = -1299.6kJ C(s) + O2(g) yield CO2 (g) -393.5 H2(g) + 1/2 O2(g)

    asked on December 29, 2007
  21. Science

    heartworm is a type of worm that enters a dogs body through a mosquito bite. it produces offspring that lodge in a dogs arteries and food off of surrounding cells. which type of relationship is this a. mutualism b. predation c. commensalism** d. parasitism

    asked on December 2, 2015
  22. steve plz help me on my math

    Find the perimeter of a rectangular area with a length of 13 inches and a width of 7 inches using distributive property and not using it.

    asked on December 1, 2016
  23. physics

    You are piloting a small plane, and you want to reach an airport 450 km due south in 3.0 hours. A wind is blowing from the west at 80 km/h. What heading and airspeed should you choose to reach your destination in time?

    asked on October 12, 2010
  24. Chemistry

    The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius? Is the answer 5.36 about right. I'm not

    asked on January 6, 2015
  25. homeschool

    What are the products of the double-replacement reaction between potassium chloride and silver acetate?

    asked on December 16, 2012
  26. Math

    Felix has a bag of 6 yellow marbles and 6 green marbles. He picks a marble and then puts it back 26 times. The results are shown in the table. Yellow 15 and green 11. What is the percent error of pulling a yellow marble in Felix’s experiment?

    asked on February 19, 2020
  27. Maths

    As water drains out of a 2000L hot tub, the amount of water remaining in the tub can be modelled by the function V=0.00002(100-t)^4 , where t is the time, in minutes (t is greater than or equal to 0 and less than or equal to 100), and V is the volume of

    asked on September 27, 2009
  28. Pre-Calculus-check answers

    If cos theta = 0.8 and 270

    asked on August 31, 2008
  29. math

    what is 2.47 rounded to the nearest tenth?

    asked on November 17, 2010
  30. math

    Lucy earns money babysitting. Her earnings and hours worked represent a direct variation. She worked for 4 hours and earned $25. Determine the constant of proportionality for hours worked per dollar earned. ;D

    asked on September 11, 2019
  31. MATH

    Sal's Sandwich Shop sells wraps and sandwiches as part of its lunch specials. The profit on every sandwich is $2 and the profit on every wrap is $3. Sal made a profit of $1,470 from lunch specials last month. The equation 2x + 3y = 1,470 represents Sal's

    asked on October 28, 2015
  32. English

    Has anyone read "The Destructors" who can help me with a few questions? My questions are: The mood on "The Destructors" is best described as humorous horrific adventuresome cold In "The Destructors" Greene uses a lot of ___ in the boy's language to enrich

    asked on November 8, 2015
  33. History

    What does this mean? "It is apparent to my mind that the President thoroughly believed the tenure of office act to be unconstitutional and void . He was advised by every member of his cabinet...... "This was a punitive statue. it was directed against the

    asked on February 11, 2016
  34. ipc

    How would I balance this equation Ca(C2H3O2)2+K3PO4-->Ca3(PO4)2+KC2H3O2

    asked on February 10, 2009
  35. Chemistry

    For the chemical reaction CH3Br + OH- CH3OH + Br-, which of the following would speed up the reaction? increasing the CH3Br concentration reducing the OH concentration cooling the reactant mixture Please help with this question. I appreciate it. Thank you.

    asked on April 16, 2012
  36. genetics

    In tomatoes, the allele T for tall plant height is dominant to dwarf allele t, the P allele for smooth is dominant to the p allele for peach fuzz skin, and the allele R for round fruit dominant to the recessive r allele for oblong fruit. The genes

    asked on March 22, 2015
  37. Chemistry-College

    Given that: 2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821 kJ/mol Calculate the standard enthalpy change for the following reaction: 2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s) _______kJ

    asked on October 31, 2010
  38. physics

    The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the

    asked on January 6, 2015
  39. Math

    Which experiment has a non-uniform probability model? SELECT TWO ANSWERS. A.Tossing a fair coin one time B.Randomly guessing the answer to a question on a multiple choice test that has four answer choices for each question C.Spinning a spinner with

    asked on February 19, 2020
  40. maths

    A plane climbed 10.000m in 19.4 minutes. What was the average rate of climb per minute

    asked on January 27, 2019
  41. Pre-Calculus-check answers

    Use a sum or difference identity to find the exact value of sin 255 degrees Answer: sqrt6-sqrt2/4 Thanks

    asked on August 30, 2008
  42. College (Enthalpy) - College

    S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for

    asked on October 31, 2010
  43. General Chemistry

    Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3.

    asked on April 3, 2012
  44. Algebra

    A = P(1 + rt) is used to find the principal amount P deposited, earning r% interest, for t years. Use this to find what principal amount P David invested at a 5% rate for 12 yr if A = 7,000.

    asked on February 7, 2019
  45. LiteratureSATIRE143

    PLEASE CORRECT!! _______ 1. A Modest Proposal satirizes — A English policy in Ireland B Irish bankers C people who do not pay rent D problems caused by overpopulation ______ 2. The narrator of AModest Proposal assumes the character of a(n) — F American

    asked on November 3, 2011
  46. Math

    Mrs. Daniel pays $324 for a handbag and 3 pairs of shoes. The handbag costs half as much as the 3 pairs of shoes combined. Find the cost of the handbag.

    asked on September 15, 2011
  47. PAP ALG

    the average radius of Jupiter's orbit is 464,779,036 miles, and it travels at an average speed of 28,108 miles per hour. Q: How many years does it take Jupiter to orbit the sun?

    asked on August 25, 2017
  48. Chemistry :(

    Given that: 2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821 kJ/mol Calculate the standard enthalpy change for the following reaction: 2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s) _______kJ PLEASE

    asked on October 31, 2010
  49. Math

    If 3,p,q,24 are consecutive terms of an exponential sequence. Find the value of p and q.

    asked on October 1, 2019
  50. Math

    You want to buy three books that are on sale at 20% off. The original prices of the books are $2.50, $4.95, and $6.00. How much will you save?

    asked on November 30, 2016
  51. Chemistry

    Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?

    asked on January 24, 2013
  52. Math

    Suppose you toss a fair, two-sided coin. List the sample space. List one possible event. Calculate the probability of that event.

    asked on February 19, 2020
  53. English

    What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? Which of the following most clearly describes a central theme in the Walt Whitman poem, “I Hear America Singing?” Every man and woman contributes positively and

    asked on November 7, 2012
  54. Calculus

    A sherman is in a rowboat on a lake and 3 km from shore. He wishes to reach a store 2 km down the (straight) shore. He can row at 5 km/h and run at 13 km/h. To what point down-shore should he row to get to the store as quickly as possible? 8. The

    asked on December 3, 2014
  55. math

    Show that if a radioactive substance has a half life of T, then the corresponding constant k in the exponential decay function is given by k=-ln(2)/T I'm confused about how to show that that is true.

    asked on September 4, 2014
  56. math

    The distance (d) in meters that an ant can travel varies directly with the amount of time (t) in hours it spends walking. Assume that an ant’s constant of proportionality is 18. If an ant walks for 10 minutes, how far will it travel in meters? If an ant

    asked on September 15, 2019
  57. math

    If a ball is thrown directly upward with a velocity of 80ft/s, its height (in feet) after t seconds is given by y=80t-16t^2. What is the maximum height attained by the ball?

    asked on December 15, 2007
  58. physics

    A steel aircraft carrier is 361 m long when moving through the icy North Atlantic at a temperature of 1.7° C. By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 16° C?

    asked on November 5, 2012
  59. Genetics

    The boss in your laboratory has just heard of a proposal by another laboratory that genes for eye color and the length of body bristles may be linked in Drosophila. Your lab has numerous pure-breeding stocks of Drosophila that could be used to verify or

    asked on March 22, 2015
  60. Chemistry

    How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius

    asked on March 12, 2015
  61. English

    A verb phrase that acts as a noun is called a(n) participal adverbial infinitive gerund Which of the following is a prepositional phrase in the sentence below? (Applause came from the bleachers.) Applause came came from from from the bleachers My answers:

    asked on November 3, 2015
  62. Physics

    Two negatively-charged bodies with -5.4e-5 C are 0.20 m from each other. What force acts on each particle? F=kqq/d^2 F=(9.0e9)(q)(q)/(.20^2) Would both q's equal -5.4e-5 C?

    asked on January 13, 2008
  63. Pre-calculus

    solve 4 sin^2x + 4 sqrt 2 cos x-6=0 for all real values of x. Going by the example in the book I got to: 4 cos^2x + 4sqrt2 cosx -10 = 0 but do not know how to proceed. Any help would be great. Thanks

    asked on October 13, 2008
  64. stats

    Particles are a major component of air pollution in many areas. It is of interest to study the sizes of contaminating particles. Let X represent the diameter, in micrometers, of a randomly chosen particle. Assume that in a certain area, the probability

    asked on February 3, 2011
  65. Math

    Three picture frames are on a dresser.two are shaped like squares and the other is a trapazoid. how many sides are there in the frames altogether? Please help today

    asked on May 23, 2016
  66. Ochem

    Give the products (if any) expected from the treatment of the following compounds with ozone followed by aqueous hydrogen peroxide. Do not include any byproducts. 1) 2-methyl-2-pentene 2) cyclooctene Please help! I'm not sure on where to start with this

    asked on February 8, 2012
  67. Algebra II

    Use two ordered pairs to write a prediction equation. Then using your prediction equation to predict the number of comic books sold when the price is $4.50. The table is as follows: Price-$2.00 # sold was 16 -$2.50 13 -$2.75 12 -$3.00 10 -$3.50 7 I used

    asked on January 6, 2008
  68. Language Arts

    1. In which sentence is the word blander used logically? A. The cook added spices to make the food taste blander B. If you do not like hot food, you should you blander dishes C. In ordinary circumstances, hot sauce makes the food taste blander** D. The

    asked on November 6, 2015
  69. Spanish

    I am confused as to when I should use la or el. For example: Mi televisor es peor que el televisor de mi hermano. Es _______________de la casa. a) la peor b) el peor Each means "the worst" and I am guessing that I use el peor since televisor is male (I

    asked on August 3, 2008
  70. Math

    A tree is losing its trees. Two thirds fall off in the first week, two thirds of those remaining fall off in the second week, and two thirds off those remaining fall off in the third week. Now there are 37 leaves. How many leaves did the tree have

    asked on October 25, 2014
  71. Math

    Find the probability of spinning a 5 and rolling a 1, 2, or 3. A) 1/16 B) 1/2 C) 1/6 D) 1/8

    asked on April 19, 2020
  72. Chemistry

    Phenolphthalein is an indicator that changes colour to pink/purple between pH 8-->10, however, neutralization occurs when pH=7. Why can phenolphthalein still be used as the indicator during a strong acid-strong base titration with virtually no error?

    asked on December 12, 2007
  73. math

    Determine if the equation y = 2/5 x − 4 represents a proportional relationship. If so, determine the constant of proportionality.

    asked on September 11, 2019
  74. math

    Regina has a bag of 6 orange marbles and 6 black marbles. She picks a marble at random and then puts it back in the bag. She does this 24 times. The results are shown in the table. Determine the percent error of pulling a black marble in Regina’s

    asked on February 13, 2020
  75. Physics

    A 4.2 kg object is subjected to two forces, F~ 1 = (2.1 N) ˆı + (−1.7 N) ˆ and F~ 2 = (3.2 N) ˆı + (−11.2 N) ˆ. The object is at rest at the origin at time t = 0. What is the magnitude of the object’s acceleration?

    asked on October 14, 2018
  76. Algebra

    Please check my answer The domain of the following relation: R: {(−4, 8), (8, 10), (5, 4), (1, 6), (5, −9)} is a. {8,10,4,6,-9} b.{-4,1,5,8) c. {-4, 8, 5,1,5} d. no domain exists I think that it is A, Am I right? Thanks

    asked on October 30, 2015
  77. microeconimics

    one type of systematic error arises because people tend to think of benefits in percentage term rather than in absolute dollar amounts. as an example, samir is wiling to drive 20 minutes out of his way to save $4 on grocery item that cost $10 at local

    asked on July 10, 2015
  78. Pre-calculus

    Nathaniel pulls a sled along level ground with a force of 30 newtons on the rope attached to the sled. If the rope makes an angle of 20 degrees with the ground when it is pulled taught, find the horizontal and vertical components of the force. Round to the

    asked on October 19, 2008
  79. spanish

    ¿Cuál de los siguientes NO ES uno de los autores latinoamericanos que ganó el Premio Nobel? a. Miguel Angel Asturias c. Jorge Luis Borges b. Gabriela Mistral d. Pablo Neruda

    asked on March 29, 2013
  80. Physics

    What is the potential difference required to accelerate a deuteron of mass 3.3x10^27kg and charges 1.6x10^-19C from rest to a speed of 5.0x10^6m/s?

    asked on April 21, 2009
  81. Calculus

    Evaluate each telescoping sum: 1) Sum from i = 1 to 100 of (5^i - 5^(i-1)). I know that I could apply the (n(n+1))/2 summation rule to the 5^i part of the question and then plug in 100, but I am unsure what to do for the second half --> -5^(i-1)! Thank you

    asked on January 9, 2015
  82. Spanish 2

    1. Which of the following is correct? a) Maria estaba cocinando cuando ella se cortaba. b) Maria estaba cocinando cuando ella se corto. c) Maria estuvo cocinando cuando ella se cortaba. d) Maria estuvo cocinando cuando ella se corto. 2. Which of the

    asked on September 11, 2016
  83. Simple Calculus

    Evaluate \displaystyle \lim_{x \to 0} \frac{\sqrt{2}x}{\sqrt{2+x}-\sqrt{2}}.

    asked on March 28, 2013
  84. HELP!

    Which set of numbers is correctly ordered from smallest to greatest? A) 0.009, 0.0099, 0.0909, 0.099 B) 0.0099, 0.009, 0.0909, 0.099 C) 0.0909, 0.099, 0.009, 0.0099 D) 0.099, 0.0099, 0.009, 0.0909 Help ME!

    asked on December 8, 2016
  85. Social Studies

    What effect did United States policy have on the Soviet Unions war in Afghanistan and why did Soviet troops finally withdraw from Afghanistan in 1989? A. With U.S. support, the Soviet Union defeated the Afghan rebel forces. B. During peace talks, Ronald

    asked on May 22, 2017
  86. govenment

    The government set up by the Articles of Confederation had a. no legislative or judicial branch. b. only a legislative and an executive branch. c. only a legislative branch, consisting of a unicameral Congress. d. only a legislative branch, consisting of a

    asked on March 28, 2013
  87. Chemistry (Enthalpy)-College

    Given that: 2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821 kJ/mol Calculate the standard enthalpy change for the following reaction: 2Al(s)+Fe2O3(s)--->2Fe(s)+Al2O3(s) _______kJ

    asked on October 31, 2010
  88. interior decorateor

    Which of the following statements is correct regarding the design concept of emphasis? A. Focal points in a room's architecture must be emphasized with contrasting colors. B. A focal point can't be established in a setting where formal balance is used. C.

    asked on August 24, 2016
  89. Calc

    A particle is moving along the curve y= 4 sqrt{2 x + 2}. As the particle passes through the point (1, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.

    asked on April 21, 2014
  90. math

    Given that 2x^2-kx+18 is a perfect square,find k and hence solve the equation 2x^2-kx+18=0 by factorisation.Plz explain in detail.

    asked on April 8, 2020
  91. Algebra II

    Write the equation log243(81)=4/5 in exponential form. My answer is 243^4/5=81. Evaluate 9^log9(54). My answer is 6. Are these correct?? Thanks

    asked on March 29, 2008
  92. Chemistry

    How many grams of ethanol must be added to 500.0 g of water to make a solution that freezes at 0.00 degrees fahrenheit? The molal freezing point depression constant for water is 1.86 degree celsius over moles.

    asked on October 24, 2016
  93. soanish

    he following question about Gabriel García Márquez. ¿Qué suceso importante aconteció para Márquez en 1982? a. publicó la novela “Cien años de solerdad” c. escribió sus obras mas importantes b. se le otorgó el Premio Nobel de Literatura d.

    asked on March 29, 2013
  94. Physics B

    A 40-kg block of ice at 0°C is sliding on a horizontal surface. The initial speed of the ice is 7.0 m/s and the final speed is 4.7 m/s. Assume that the part of the block that melts has a very small mass and that all the heat generated by kinetic friction

    asked on January 15, 2009
  95. Physics

    A bomber on a military mission is flying horizontally at a weight of 3000m above the ground at 60km mn–¹,it drops a bomb on a target on the ground.determine the acute angle between the vertical and the line joining the bomber and the target at the

    asked on August 24, 2019
  96. chemistry

    What is the lewis dot structure for Fluoride, F1- and Mg2???

    asked on October 20, 2007
  97. genetics

    kernel phenotype Number colored, shrunken, starchy 116 colored, full, starchy 601 colored, full, waxy 2538 colored, shrunken, waxy 4 colorless, shrunken, starchy 2708 colorless, full, starchy 2 colorless, full, waxy 113 colorless, shrunken, waxy 626 total

    asked on March 22, 2015
  98. Pre- calculus

    Find A, given that a = 18.2, B = 62, and C = 48. Round answers to the nearest whole degree. Do not use a decimal point or extra spaces in the answer or it will be marked incorrect.

    asked on March 15, 2012
  99. Chemistry

    Calculate the enthalpy change for the reaction 2C + H2 yield C2H2 given the following reactions and their respective enthalpy changes: C2H2 + 5/2 O2 yield 2CO + H2O -1299.6 C + O yield CO2 -393.5 H2 + 1/2 O2 yield H2O -285.9 I don't even know how to start

    asked on December 24, 2007
  100. science

    Name the conditions under which urine production increases in mammals

    asked on December 23, 2019


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