Questions Asked on
March 19, 2007

  1. Chemistry

    A 35g sample of Fe is dropped into 80g of water at 20 degrees Celsius. What is the final (equilibrium) temperature of the iron/water? This isn't really a chemistry problem. There will be no chemical reaction. It is a heat capacity (physics) problem. Use

    asked by Michelle
  2. physics

    A theoretical gasoline engine runs with 76 percent efficiency. It is calculated that it expels 3.25*10^4 J of heat. a. Find the heat absorbed in one cycle. b. Find the work output in one cycle. All this comes from the definition of efficiency.

    asked by anonymous
  3. physics

    If a bowl of salt water is left in the sun long enough for the water to evaporate a layer of salt crystals will be left in the bottom of the bowl. Salt crystals are more ordered than dissolved ions. How does the increase or decrease in entropy relate to

    asked by anonymous
  4. Biology

    do you know if there are any good websites on population distrubution patterns and relevant adaptations of organisms? You need to choose a population. A species of orchids? A species of animals (kangaroo, etc)? A type of bird? A disease vector ? Make a

    asked by san
  5. general

    Can you list me what are the animals of the black forest ???? please Thanx http://www.google.com/search?q=schwarzwald+animals&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA You will find many different animals named in the

    asked by AMY
  6. chem

    For a double replacement reaction to occur, is it that one of the products must be insoluble and form a solid? There has to be some mechanism to remove the products from the reaction so that the reaction does not proceed in the reverse direction. Product

    asked by Amie
  7. global studies

    because canada is such a long way from the equator,much of the country has a climate that is? http://www.google.com/search?q=canada+climate&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA I live in southern Ontario, the

    asked by matt
  8. global studies

    The rivers of Quebec Province are used to make? http://www.britannica.com/ebi/article-207027 =)

    asked by joe
  9. global studies

    the four major kinds of plant life in the United states are:tundra,grassland,desert scrub, and? Thank you for using the Jiskha Homework Help Forum. What about forests and flowering plants? P.S. Although the following link may not answer your question, it

    asked by nancy
  10. global studies

    which is not a way that the canadian government attempts to cooperate with french canadians? This looks like a multiple choice question. If so, please post the choices and indicate your answer.

    asked by jack
  11. Science

    Granite is an intrusive, felsic rock, which may be produced by partial melting or fractional crystallization. Explain how these processes can produce felsix magmas from more mafic parent magmas. Since this is not my area of expertise, I searched Google

    asked by Anthony
  12. IGCSE Biology

    Okay i have an exam in a couple of weeks, and i don't know how birds reproduce. So i was wondering whether or not anyone knew the detailed steps for it/ how it happens. thanx for your help!!! :D Birds reproduce by sexual reproduction, with external eggs,

    asked by Nani
  13. History

    What was the Armistad controversy? And, what rold did it play in the abolition of slavery? I think you mean the Amistad controversy, right?

    asked by Jeri
  14. math

    The length of a rectangular playing field is 5ft. less than twice its width. If the perimeter of the playing field is 230ft, find the lenght and width of the field. 2W+2L= perimeter = 230 L=2W-5 ============ Solve these simultaneous equations. Post your

    asked by cheryl
  15. math

    A bicyclist rode into the 5h. In returning, her speed was 5 mi/h faster and the trip took 4h. What was her speed each way? distance =rate*time The distance is the same. y = rate going z = rate returning Going: d = y*t = y*5 = 5y return: d = z*t = z*4 = 4z

    asked by cheryl
  16. math

    A bus leaves a station at 1 p.m, travling at an average rate of 44 mi/h. One hour later a second bus leaves the same station, travling east at a rate of 48 mi/h. At what time will the two buses be 274mi. apart? Set up two equations as I did in the two

    asked by cheryl
  17. math

    850 douglas fir and ponderosa pine trees in a section of forest bought by a logging company. The company paid an average of $300 for each Douglas fir and $225 for each ponderosa pine. If the company paid $217,500 for the trees, how many of each kind did

    asked by cheryl
  18. math

    2x(x-2)=x+3 2x-2=x+3 What error has been made in solving this equation, and what could be done to aviod this error? The 2x was NOT multiplied by the contents of the parenthsis. Should have been 2x2 - 4x

    asked by cheryl
  19. math

    400 people found that 66 were left-handed. What percent of the 400 were left-handed? percent= 66/400 * 100

    asked by cheryl
  20. math

    If the total bill at a restaurant, including a 15% tip, is $65.32, what was the cost of the meal alone? 1.15 X = $65.32 I am assuming that you can solve this equation for X (the cost of the meal alone). If you cannot, respond to this post with more

    asked by cheryl
  21. math

    Ted must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75, 63,and 68. Write an inequality representing the score that Ted must get on the last test to get a C grade. Let X be the grade on the

    asked by cheryl
  22. math

    The cost of a long-distance telephone call is $.36 for the first minute and $.21 for each additional minute or portion thereof. Write an inequality representing the number of minutes a person could talk without exceeding $3. cost= .36 + .21(m-1) then put

    asked by cheryl
  23. chem

    when a gas is collected over water, is the gas pure? No. It has water vapor in it.

    asked by david
  24. Math

    An electronics firm uses 600 cases of transistors each year. The cost of storing one case for a year is 90 cents, and the ordering fee is $30 per shipment. How many cases should the firm order each time to keep total cost at a minimum, assuming the

    asked by becky
  25. Finance/Math

    1. Present Values. Compute the present value of a $100 cash flow for the following combinations of discount rates and times. a. r = 8 percent. t = 10 years b. r = 8 percent. t = 20 years c. r = 4 percent. t = 10 years d. r = 4 percent. t = 20 years 2.

    asked by Ethan
  26. Math

    Bond Yields. An AT&T bond has 10 years until maturity, a coupon rate of 8 percent, and sells for $1,100. a. What is the current yield on the bond? b. What is the yield to maturity?

    asked by Xavier
  27. Finance

    Bond Pricing: A 6-year Circular File bond pays interest of $80 annually and sells for $950. What is its coupon rate, current yield, and yield to maturity? Bond Pricing : If the Circular File wants to issue a new 6-yar bond at face value, what coupon rate

    asked by Xavier
  28. macroeconomics

    a) Suppose the economy is characterized by the following behavioral equations: C = c0 + c1YD YD = Y – T I = b0 + b1Y Government spending is constant. Note that investment now increases with output. Chapter 5 will discuss the reasons for this relation.

    asked by Eve
  29. chemistry

    Write the compound formulas for each of the following pairs and the name of the compound formed when the elements or radicals combine. Mg+2 + OH-1 K+1 + PO4-3 Cu+2 + S-2 N+5 + O-2 Compounds have zero charge. Therefore, for magnesium hydroxide, the first

    asked by jessica
  30. Math

    Hi how do we rearrange this into y=mx+b form? Ax+By=8 steps would be appreciated

    asked by gorden
  31. math

    what is an inequality? http://en.wikipedia.org/wiki/Inequality

    asked by lizzy
  32. physics

    The length of a bicycle pedal arm is 0.152 m, and a downward force of 146 N is applied to the pedal by the rider's foot. What is the magnitude of the torque about the pedal arm's pivot point when the arm makes the following angles with the vertical? (a)

    asked by wolfpak
  33. PHYSICS

    The acceleration of the center-of-mass point of a system of particles depends on: a) all the forces acting on the system b) only the external forces acting on the system c) only the internal forces acting on the system

    asked by terrence
  34. PHYSICS

    The area under a force-versus-time curve is: a) momentum b) impulse c) velocity what's the area under a force-vs-time curve: momentum, impulse, or velocity?

    asked by terrence
  35. PHYSICS

    When the force F acting on a particle depends only on the particle's position coordinate x, and when the particle moves along the x-axis, then the work done by the force is the area under: a) F versus x curve b) F versus v curve (v is velocity) c) F versus

    asked by terrence
  36. Chemistry

    How many carbon dioxide molecules will form when a naptha molecule burns? Thanks Write the equation, then solve it just as we did the problem on water molecules yesterday. Post in detail any questions you have about what to do next.

    asked by Jessica
  37. English

    I Have an oral presentation to do on how past wars have affected our lifestyles today can you help? If you give us an outline of what you've thought about for your presentation, we'll be glad to add our comments. Depending upon how long the presentation

    asked by Virginia
  38. Social Studies

    What did Thomas Jefferson and Alexander Hamilton begin disagreeing about in ,like, 1889? Jefferson and Hamilton had been dead for many years by 1889. For information about their disagreements starting about 1789, check out these sites.

    asked by Zilpha
  39. science

    I am studying science at GCSE. I a working through a revision book and have come across a question which i am unsure of the answer. The question is, "state the number of different elements present in C6H5CO2Na." The answer i have is 14 but still i am

    asked by sam
  40. computer

    this isnt really a school question but i have a question about the sun java...it wouldnt load any of my games using it but whenever i deleted it and using the regular java...its working fine...it doesnt make any sense...please i hope someone can explain

    asked by sheila
  41. science chem

    Please could someone give me a link to a site that explains waht an alkali is? thanks I don't know of a site BUT I probably can find one if you really want it. However, an alkali is simply a base such as NaOH or KOH, or lye. If you still want me to look

    asked by sam
  42. Economics

    1.) How do producers use market research to help maximize profits? 2.) Give two examples of companies that are characterized by a monopolstic competition market structure.

    asked by Chrissy
  43. Algebra

    ARE THESE CORRECT? Over the yrs, the O'Connell Company has been switching from typewriters to computers. At once time the company had 815 typewriters which were wearing out at a rate of about 60 per year. At the same time, they had 500 computers and were

    asked by River
  44. Science question needs answering

    Please note that we don't do students' homework for them. Once YOU have come up with a response to YOUR questions, please re-post and let us know what you think. Then someone here will be happy to critique your work. list the characteristics scientists use

    asked by Writeacher
  45. Calculus

    Which of the following series can be used to compute ln(.8)? a) ln(x-1) expanded about x=0 b) lnx about x=0 c) ln x in powers of (x-1) d) ln(x-1) in powers of (x-1) e) none of the proceding I am confused... please help!

    asked by Joan
  46. Terry High School

    5,3x-7=2x+1 Please never put personal identifying data in your post, like the address, or full name, or the name of your high school. The world is a dangerous place. Please discuss this with your mom. I can tell what you mean by 5,3x What are you trying to

    asked by Debbie
  47. Science

    What is the function of the right brain and why is it important in optical illusions? Since this is not my area of expertise, I searched Google under the key words "right left brain illusions" to get these possible sources:

    asked by Gina
  48. Punctuation

    I need to be sure that I punctuated these sentences properly. Each group emphasizes on a particular punctuation mark. Punctuation within Sentences—Colon 1.

    asked by Beth
  49. Finance

    1. Present Values. Compute the present value of a $100 cash flow for the following combinations of discount rates and times. a. r = 8 percent. t = 10 years b. r = 8 percent. t = 20 years c. r = 4 percent. t = 10 years d. r = 4 percent. t = 20 years 2.

    asked by Antoinette
  50. Finance

    Bond Yields. An AT&T bond has 10 years until maturity, a coupon rate of 8 percent, and sells for $1,100. a. What is the current yield on the bond? b. What is the yield to maturity?

    asked by Antoinette
  51. Finance

    Bond Yields. An AT&T bond has 10 years until maturity, a coupon rate of 8 percent, and sells for $1,100. a. What is the current yield on the bond? b. What is the yield to maturity? I believe you are missing something; either the market rate of return or

    asked by Antoinette
  52. volume stoichiometry

    Determine the volume of oxygen that is needed at STP to completely react with 5.63 g of potassium. 4K + O2 yields 2H2O I don't buy the equation. If K is reacting with oxygen, then the equation is 4K + O2 ==> 2K2O Actually, I think it forms K2O2. Do you

    asked by shelley
  53. Algebra - solving linear equations w/ substitution

    The question in the book reads: "Suppose you try to solve a system of linear equations using substitution and get this result. How many solutions does each system have?" 1)x=-2 2)y=12 3)6=x 4)-8=-8 5)7=y 6)5=3 I understand #3 and #6, but I do not

    asked by Samantha
  54. chem help

    a scuba diver breathing normal air descends 100m of depth, where the total pressure is 11 atm. What is the partial pressure of oxygen that the diver experiences at this depth? Can someone help out on this question? Make a ratio: 11atm/1atm= P/partial

    asked by david
  55. Chem

    Could someone explains reaction heat and Entropy and Free Entropy to me. And can you please give an example of each. Thanks Much! ;) Since this is not my area of expertise, I searched Google under the key words "heat entropy free" to get these possible

    asked by Hello Kit
  56. science

    forces that change the shape of the land wind? water?

    asked by Anonymous
  57. algebra

    How do I find out if x-1 is a function --- 3 and does x-1 1 1 --- =y = - - - =y 3 3x 3 oh sorry, it came all weird when i typed it out can you just answer me this? how do i find out if (x-1)/3 is a function? oh, and sorry, the name's wrong because I used

    asked by Lynda
  58. Math

    The Bookholder Company manufactures two types of bookcases out of oal and walnut. Model 01 requires 5 board feet of oak and 2 board feet of walnut. Model 02 requires 4 board feet of oak and 3 board feet of walnut. A profit of $75 is made on each Model 01

    asked by Marie
  59. math

    How do you determine whether something is a function or not? If it is a rule or formula that lets you input one number to get another, then it is a function.

    asked by George
  60. math

    which is greater 98% or 9.8? well a percent is out of 100, so written as a decimal 98 percent would be 0.98 well then if 98% is 0.98 then what % would 9.8 be?

    asked by Rebekka
  61. social studies: Maps

    Does anyone know where on the internet to find a fairly good political map of Asia? I have already google searched and none of the results were good. Thanks for any help. This seems to be a pretty good site. There are many possibilities. I checked the 2000

    asked by lilly
  62. math

    so if 98% is 0.98 then what % would 9.8 be? please do not multiple post the same question,Thanks.

    asked by Rebekka
  63. math

    so if 0.98 = 98% then what % would 9.8 be? 980

    asked by Rebekka
  64. Math (quick check plz)

    hi i rearranged these terms into y=mx+b can you plz check and see if they're right? 1. 2x+5y-16=0 2. 4x-3y-6=0 3. 3x+y+2=0 1. 5y=-2x+16 2.3y=-4x+6 3. y= -3x-2 tnx ^^ On the first two, you need to divide each side by the coefficent of y. On two, what

    asked by gorden
  65. Chemistry

    I need to predict the acid/base reactions of sodium carbonate with HCl, CH3COOH, NH3, and NaOH. I'm stuck, when I'm writing out the ions to find the strongest acid and base, does the NaHCO3 become Na and HCO3, or N, H, and CO3? Also, would these be

    asked by Lyn
  66. math

    which # is greater? 98% or 9.8? see my other post.

    asked by Rebekka
  67. math...help please!

    so if 0.98 = 98% then what % would 9.8 be? 980 percent

    asked by Rebekka
  68. math

    what are some examples of a rate? speed of a car, how fast a cake bakes, how fast your sister grows, the speed of your grades going down if you start to not turn in homework.

    asked by remae
  69. Math...

    Describe a situation that could be modelled by each linear equation. a) p=6.75h b) p=25+6.75h please help. thanks. a) A basic rate of pay b) A rate of pay in which a person is paid an initial $25, plus $6.75 per hour after that.

    asked by May
  70. Science

    I need help finding the missing word heres what i wrote. But i'm not to sure this word goes with it. An adequate supply of fuelwood helps to prevent disease by allowing water to be boiled to ____________ it. [Protect???] sterilize

    asked by Mack
  71. Social Studies

    Why did the settlers name their community Seattle? http://www.chiefseattle.com/history/chiefseattle/chief.htm

    asked by Will
  72. Social Studies

    why is indianapolis know as the "Crossroads on America"? http://en.wikipedia.org/wiki/Crossroads_of_America

    asked by Will
  73. Chemistry

    Completion Stuck on number 7 & 11 on my homewowrk 7)An Equation must never be balanced by changing the _______ in the chemical formula of a substance. 11)If a _______ is used to increases the rate of a chemical reaction its formula is written above the

    asked by Chris
  74. American Indian Studies

    Which Plains tribes most resisted expansion? http://www.google.com/search?q=plains+tribes+expansion&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA There are several websites in this group of search results that should help.

    asked by Plain tribes
  75. science

    what are 4 differences between ionic and covalent bonding? plz help thanks!! http://antoine.frostburg.edu/chem/senese/101/compounds/faq/properties-ionic-vs-covalent.shtml i clicked on the link but it doesnt tell me anything See if it works (Broken Link

    asked by hannah
  76. science

    can two liquids possess the same degree of toxicity but present different degrees of hazard? Of course. One could be more volatile.

    asked by Mary
  77. english

    i need a quote from julius caesar and a good connection to something that's going on in the world, i am having trouble. please help me. http://quoteland.com/author.asp?AUTHOR_ID=119 There are many here from Shakespeare's plays, including several from

    asked by kayla :]
  78. Science

    I'm having trouble figuring out what the independent and dependent variables are in the following experiment: 1.

    asked by Zack
  79. History

    What do the 35 stars and their arrangement and the 13 strips mean on the 7th Cavalry Guidon Flag that Custer used in the battle of little big horn Thank you for using the Jiskha Homework Help Forum. On the first site you can see the flag:

    asked by Suzy
  80. question

    there are some practical applications for fractions in your daily life. What are the challenges you have experienced regarding the use of fractions? Explain your answers. Practical application: cooking and measuring ingredents, measuring time (half past,

    asked by carmen
  81. math

    In your opinion, how is the order operation used to solve equation. exponets, groups, multiplication, division, addition, subtraction. This allowes you to get the same result every time..... I hope this helps :) I searched Google under the key words "math

    asked by cheryl
  82. Chem

    Chloroform, CHCl3, was once used as an anesthetic. In spy movies it is the liquid put in handkerchiefs to render victims unconscious. Its vapor pressure is 197 mmHg at 23 degrees C and 448 mmHg at 45 degrees C. Estimate its a) heat of vaporization b)

    asked by Chris
  83. alebratic propertys

    Can someone help me solve these m1=(3x+20) m3=5x-16 (Vertical Angles are Congruent) a.) _____ = (5x - 16) (Substitution) b.) -2x + 20 = _____ (Subtraction Prop. of Equality) c.) -2x = _____ (Subtraction Prop. of Equality) d.) x = _____ (Division Prop. of

    asked by mike
  84. Calculus!!!

    I need your help... I've posted this question a while ago but no one has answered it yet. Please please help me. Which of the following series can be used to compute ln(.8)? a) ln(x-1) expanded about x=0 b) lnx about x=0 c) ln x in powers of (x-1) d)

    asked by Joan
  85. Science

    will someone please answer my question!!!!!!!!!!!! I need finding the missing word. here's what I wrote but i'm not to sure it's the right answer. China has implemented a campaign to reduce birth rates that includes _________ rewards for single child

    asked by Mack
  86. Math

    is this correct? 9-(-2)(-7)=-5 Mult -2x-7 is 14 then 9-14=-5? Thank you? Your answer is right :)

    asked by Russell
  87. Education

    Which Early Childhood setting follows closely to Montessori theory, Naeyc accredited, childcare, first grade, preschool or primary. and then i have to give an example thanks. NAEYC accredidation is for Birth through Kindergarten. So that rules out some of

    asked by casey
  88. Algebra

    Why are variables useful in algebra? I feel the use of variables make it difficult for many people to understand because it is subconcious that math is numbers, not letters.... Thank you! By using a variable, one may make use of a formula which is good for

    asked by russell
  89. algebra

    How do I tell if (x-4)/-3=y is a function? thanks It tells you wnat y is in terms of x. It is therefore a fucntion.

    asked by Miles
  90. INFORMATION TECHNOLOGY

    WHAT IS MASTERING SKILLS Mastering = becoming so good at something that one is a "master" of it. Becoming very proficient. http://www.answers.com/mastery http://www.answers.com/proficient =)

    asked by Cassy
  91. English

    Does anyone know any websites that have humorous devices such as, absurdity, caricature, high humor, etc (with examples)? Here are two places I like. http://www.cartoonbank.com/prints_currentissue.asp?mscssid=W9RR21STX5LT8NEGE0T2BGN2NWLGBTE2&sitetype=1

    asked by Larry
  92. Biology

    Hi there, Describe the role of bacteria in biotechnology and genetic engineering. I'd appreciate the help. Thanks. Since this is not my area of expertise, I searched Google under the key words "bacteria biotechnology" to get these possible sources:

    asked by Martin
  93. Science

    I need help please. I'm really clueless of what the answer is. The theory of demographic transition is based on the idea that industrial development causes ________ and ___________ progress that affect population growth rates. [I really have no clue what's

    asked by Mack
  94. Financial Analysis

    What is the payback period on each of the following projects?

    asked by Vanessa Belunek
  95. Information Technology

    what are the benefits from using thinking skills you succeed in your educational and personal life i guess!!! I would love to hear and critique what you think of for this answer ;) Matt What happens if you DON'T use thinking skills? That is, if all you do

    asked by Cassy
  96. Chemistry 12

    Hey yall! i am working on a lab where we used NaOH solid (pellets) and 1.0M of NaOH solution. i was wondering is Sodium Hydroxide a substance that reacts with the enviroment? because maybe that could be like a source of error right? so basically i am

    asked by sandie
  97. Physics - drwls?

    A 2000 kg truck traveling north at 38 km/hr turns east and accelerates to 55 km/hr. What is the change in the truck's kinetic energy? What is the magnitude of the change in the linear momentum of the truck? What is the direction of the change in linear

    asked by winterWX
  98. biology

    please help me unscrample the following words: (the space means thate the anagram has two words in it, but the space is not necessarily at the space) rmns teizysecntiore nt roetssieitrsic id ksdxlne so derrecisgntdie Thank you very much for your time!

    asked by Lily
  99. Physics - drwls?

    A small block of mass m = 4.0 kg can slide along the frictionless loop-the-loop. The block is released from rest at point P, at height h = 23R above the bottom of the loop (R is the radius of the loop). Express your answers in the form ngR, where n is the

    asked by winterWX