Lucy

Most 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. Life orientation

discuss the contributing factors that lead to this issue

asked on May 10, 2016
4. 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
5. 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
6. 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
7. 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
8. 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
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. 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
11. homeschool

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

asked on December 16, 2012
12. 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
13. 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
14. 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

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 16. 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 17. Chemistry What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks. asked on November 18, 2007 18. math what is 2.47 rounded to the nearest tenth? asked on November 17, 2010 19. 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 20. 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 21. 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 22. 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 23. 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 24. 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 25. 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 26. 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 27. 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 28. 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 29. 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 30. 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 31. 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 32. 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 33. 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 34. 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 35. 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 36. 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 37. ipc How would I balance this equation Ca(C2H3O2)2+K3PO4-->Ca3(PO4)2+KC2H3O2 asked on February 10, 2009 38. 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 39. 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 40. 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 41. 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 42. Pre-Calculus-check answers If cos theta = 0.8 and 270 asked on August 31, 2008 43. 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 44. Simple Calculus Evaluate \displaystyle \lim_{x \to 0} \frac{\sqrt{2}x}{\sqrt{2+x}-\sqrt{2}}. asked on March 28, 2013 45. 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 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. 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

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 49. 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 50. 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 51. 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 52. 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 53. maths A plane climbed 10.000m in 19.4 minutes. What was the average rate of climb per minute asked on January 27, 2019 54. 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
55. 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
56. 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
57. 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
58. 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
59. 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
60. 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
61. 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
62. 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
63. 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
64. 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
65. 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
66. 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
67. 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

A 3.00-kHz tone is being produced by a speaker with a diameter of 0.185 m. The air temperature changes from 0 to 29° C. Assuming air to be an ideal gas, find the change in the diffraction angle θ.

asked on December 6, 2012
69. 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
70. 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
71. HELP!

Earth's inner core exists at temperatures as high as 7000oC. It exists as a _______ due to the _________. A) solid; high pressure B) liquid; high pressure C) solid; high temperature D) liquid; high temperature

asked on December 14, 2016
72. 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
73. 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
74. Math

Determine if the equation y=2/5 x = −4 represents a proportional relationship. If so, determine the constant of proportionality. I think the constant proportionality is -0.1, but I don't know if it's a proportional relationship

asked on September 13, 2019
75. 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
76. chemistry

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

asked on October 20, 2007
77. 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
78. 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
79. 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
80. 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
81. 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
82. algebra 1

at a certain high school,350 students are taking algebra. the ratio of boys to girls taking algebra is 33:37. How many more girls are taking algebra than boys? - How can you write a system of equations to model the situation? - Which equation will you

asked on January 27, 2013
83. algebra

Explain how you find ordered-pair solutions of the equation 3x – 5y = 15, and then find two such solutions.

asked on February 10, 2012
84. 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
85. 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
86. ochm

sodium lauryl sulfate can be prepared by replacing chlorosulfonic acid with another reagent. what could be used? show equations

asked on September 8, 2015
87. 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
88. Math

My-law is a recent start-up trying to cater to customers in search of legal services who are intimidated by the idea of talking to a lawyer or simply too lazy to enter a law office. Unlike traditional law firms, My-law allows for extensive interaction

asked on September 11, 2011
89. 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?

asked on January 5, 2015
90. physics

Asteroids can be classified into two broad groups based on their composition and location: carbon-rich asteroids dominate the outer part of the asteroid belt, whereas metal-rich asteroids dominate the inner part of the belt. Analysis of the fragment we

asked on February 29, 2012

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
92. 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
93. Math

Is the simplified form of 2square root of 3 − 2square root of 3 rational Yes or No

asked on November 4, 2015
94. 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
95. 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

how many different ways can the letters in the word SOCIAL be arranged if the letter C must be directly followed by the letter I? Answer: 720

asked on October 13, 2008
97. English

Read the following line from "Not Waving but Drowning." "Poor chap, he always loved larking And now he's dead" a. detached b. pleased c. objective d. critical NOT WAVING BUT DROWNING Stevie Smith Nobody heard him, the dead man, But still he lay moaning: I

asked on November 1, 2015
98. 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
99. math

Statuary Hall is an elliptical room in the United States Capitol Building in Washington, D.C. The room is also referred to as the Whispering Gallery because a person standing at one focus of the room can hear even a whisper spoken by a person standing at

asked on June 10, 2018
100. 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