# Questions Asked onFebruary 8, 2007

1. ## Chemisry

what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton

2. ## s.s

before there was mills what was used to make thread? Before there were mills and factories, people made thread at home on spinning wheels. Check this site for more information and a picture of a spinning wheel. http://en.wikipedia.org/wiki/Spinning_wheel

3. ## physics

A 35-kg skier skis directly down a frictionless slope angled at 11° to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. What is Fx (in N) if the magnitude of

4. ## physics

a) In raising a 4800 N piano with a pulley system, the workers note that for every 2 m of rope pulled down, the piano rises 0.3 m. Ideally, how much force is required to lift the piano? (b) If the workers actually pull with 2500 N of force to lift the

5. ## Chemistry

write isotpoic symbols of the form X-A (for example, C-13) for each of the following isotopes. **Do I add the number of protons and neutrons together to get the answer? The symbol is easy to figure out.** a) the iodine isotope with 74 neutrons B) the

6. ## egypt mummification

What subtance was used to stuff the nostrils of a mummy? Thank you for using the Jiskha Homework Help Forum. Here are some sites for you: http://www.si.edu/resource/faq/nmnh/mummies.htm (from the Smithsonian) http://www.mummytombs.com/egypt/insides.htm

7. ## physics

In which of the situations listed below is energy being transferred as heat to the system in order for the system to do work? In which situation is work being done on the system in order for energy to be transferred from the system as heat? a. Two sticks

8. ## physics

A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4*10^-3 m^2 and is displaced inward by 7.2*10^-2 m. If 9.5*10^5 Pa of pressure is placed on the piston, how much work is done during this process? Is work

9. ## science

When a H II region is observed, it signals what stage in stellar formation? A the initial collapse of the interstellar cloud B the formation of planetary nebulae C the prostar stage D the zero age main sequence stage E depending on their masses the stars

10. ## key signature

I am a singer who sings by ear. I've had some training, but not much in the way of theory. My question to you is, how do I tell what key I sing a song in. I am about to join a jazz trio and will have to know this. I do have a piano at home that I play by

11. ## physics

A man is sitting in a bosun's chair that dangles from a massless, frictionless pulley and back down to the mans's hand. The combined mass of man and chair is 100 kg. With what force magnitude (N) must the man pull on the rope if he is to rise with a

12. ## Social Studies

What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto. http://homeschooling.about.com/library/blcanumotto.htm

13. ## physics

Three boxes are connected by cords, one of which (mA) wraps over a pulley having negligible friction on its axle and negligible mass and two boxes (mB & mC) are hanging. The masses are mA = 22.0 kg, mB = 40.0 kg, mC = 16.0 kg. -When the assembly is

14. ## english-lord of the flies

Why is Piggy's fall emphasized? This site should help with that question. http://www.sparknotes.com/lit/flies/

15. ## chemistry check

please check Write the balanced equation, with the enthalpy component, for the rusting process, given that Hf for iron and oxygen is 0 and Hf for ferric oxide is -826 kJ/mol. 4 Fe (s) + 3 O2 (g) --------> 2 Fe2O3 (s) You need to add the heat one of three

16. ## Hm. Essay Writing?

Okay, I am in Essay writing and I need to write a conclusionary paragraph on firewood, I need to first write a thesis statement with it using oak, willow and fir I must end with a recommendation about their relative efficiency as a heat source. x_x A.k.a

17. ## AP Chem

I missed a lab in class a week ago and had to make it up just the other day. My teacher didn't have time to explain the lab to me, so he gave me a brief overview of the procedure. The objective of the lab was to calculate the specific heat of an unknown

18. ## calculus II

We're doing areas by integrals now, with 2 eqns. I have a few questions. 1. Sketch the region in the xy-plane defined by the inequalities x-2(y^2)> 0 and 1-x-abs(y)>0. and find its area. Would it be best to solve for x, then graph it as x= something? Then

19. ## Social studies

where do all human comes from? from the mother stomach Most scientists believe that humans originated in Africa.

20. ## math

who created math God. Math is a symbolic language used to express ideas in the form of sentences and statements that attempt to make somewhat precise decisions about nature.

21. ## English, punctuation

Could you help me fine 2 more punctuation mistakes in this article? Presidential first ladies have been an active force in American politics for nearly 300 years. These women's roles have been many, and varied. In 1800, Abigail Adams, dubbed "Mrs.

22. ## math

Subjects Art Business Computers English Foreign Languages Health Home Economics Mathematics Music Physical Education Science Social Studies Features Contribute Experts Forum Job Openings Homework Tips Libraries.Jiskha Link to Us Reference Parents &

23. ## Math

I need help with this specific proof: Given: CE bisects Angle ABD FB and CE are strraight line segments Prove:angle x = Angle a

24. ## Chemistry

Plutonium-239 is used in nuclear bombs. Determine the number of protons and neutrons in plutonium-239. I really don't understand this. Can someone tell me how to do this? thanks What is the atomic number of Pu? Look it up on the periodic table...that is

Ok, I am supposed to find out what the variables are by factoring and finding square roots. I couldn't find the right factors of a and c that added up to b in the equation (did that make sense?). Please help me find them! TYVM -5n+6n^2-4=0 I know

26. ## math help

could some please check to see if i got the right answers if not i will try again 1. Find the rate 392 feet/8 seconds A: 49 ft/s 2. Carlos works 8.25h and receives \$102.30 pay What will he receive at the same rate if he worked 14 hrs? A: \$173.60 3. A

27. ## To Melinda

Look at the last response to your U-?? question. I wonder?? That is what my book said...so I really don't know.

28. ## Economics

Derieve the demand for bonds. Md=\$Y(.35-i) Person's wealth is \$50,000 Yearly Income is \$60,000 I really have to idea on how to derieve the demand. Should I just put in the income(\$60,000) at \$Y and solve the equation? Daang, I thought my math was hard. I

29. ## chemistry

I would like my equation checked, sodium cyanide and water.I have worked the balanced equation as: NaCN+H20=NaOH+HCN. If you want the molecular equation this looks good to me. Actually, it's the CN^- that is hydrolyzed (reacts with water) and the ionic

30. ## religion, help

what does it mean religious pluralism and interfaith movement. I have to answer this question. what effect do you think religious pluralism and the interfaith movement will have on the future organized religion? they mean having more than one religion and

31. ## enviromental science

what is in a region of long-term atmospheric conditions Sulfur dioxide in the upper atomsphere cand lead to the formation of what that reduce the amount of sunlight reaching the surface of Earth

32. ## Math Question

A company donated 200 books to a local library. If 70 of them are fiction, what percent of the donated books are fiction. 35% is the answer There are130 books that are non-fiction.

33. ## math

determine the equation of the line in y=mx+b form that passes through 1. (-8,1) & (-9, 2) 2. (3,7) & (-5, 9) 3, (-4,0) & (4,6) Part B ) For each equation Rewreite the y=mx+b equation in general form Ax+by+c=0 where A is positive b and C are integers In

34. ## unscrambling a French word associated with art

unscramble tertcueas (it's in french and the beginning is les...) This might work: http://www.ssynth.co.uk/~gay/anagram.html Be sure to click the circle by "French," and be sure to uncheck the box before "Include single-character words (a and I)" -- !! =)

35. ## microeconomics

If the technology for producign a good improves and at the same time,the price of a substitute good falls, then the quantity bought and sold of the first good will increase. True, False, or Uncertain. Explain.

36. ## math

this question concerns the function f(x)=-2x3+3x2+12x+10 (a)find the stationary points of this function using the strategy to apply the first derivative test,classify the left hand stationary point found in part (a) find the y-coordinate of each of the

37. ## Essay writing

Can u help me plz, i have to write an essay on "What is the place of animals in the lofe of Man?" Thank u :-) ... in the life of man -- ?? Here are a few websites that are excellent about leading you through the writing process in order to end up with a

38. ## Macroeconomics

Economists have found that a good approximation of value added production fucntion is given by Y=TFP*(K^alpha)*(L^-alpha) TFP is Total factor Productivity K is capital stock L is quantity of labor used alpha is a paramater around 1/3. How is value added

1.

40. ## Physics

Look up or derive the frequencies of the standing waves of a length of wire, L, clamped at the ends and under tension. What are the similarities and differences between a vibrating string and a resonating pipe? Does the diameter of the wire matter? Does

41. ## math

What are Base Ten Blocks? Since this is not my area of expertise, I searched Google under the key words "base ten blocks" to get these possible sources: http://www.susancanthony.com/Resources/base10ideas.html http://www.learningbox.com/base10/ From what I

42. ## Chemistry

Write the balanced camical equation for the complete combustion of propane C3H8, a fuel used in gas grills (carbon dioxide and water are products). This is the WRONG answer that I got... 2(C3H8) + 7(02) -> 3(CO2) + 8(H20) Can anybody help me? 2(C3H8) +

43. ## math check

1 four buttons have diameters of 5/8 , 3/4, 9/16, and 7/8 which buttons is smallest? answer 9/16 2. I spent 1/3 of my time doing math homework and 2/7 preparing for a history test . what fraction of study time remain? answer: 13/21 3. least common multiple

44. ## Math/Chemistry

We were given an assignment to find a formula for finding the density of water. I wasn't in class when the assignment was given, but the teacher gave the class two values: density H2O at 20 degrees C= .998823 g/mL density H2O at 25 degrees C= .99707 g/mL A

45. ## math

who created math

46. ## Math

To get the lower quartile and upper quartile do I get the median then find the median of the numbers above and below the median? Yes.

47. ## Budget constraint

X=view of the sea Y=wine Price of X: Px=0 Price of Y: Py=5 Income=10 Assume that a person does not look at the view beyond the point that bores him (when the marginal utility is negative) a) Sketch the budget constraint I know the y-int is 2, but i am not

48. ## Science!

Which factors that affect rate involved in making a campfire? temperature, amount of cooling wind, size of tender, dryness of tender, dryness of wood. Of course if you douse the wood with kerosene, all this is moot.

49. ## would someone please check this math

1 four buttons have diameters of 5/8 , 3/4, 9/16, and 7/8 which buttons is smallest? answer 9/16 2. I spent 1/3 of my time doing math homework and 2/7 preparing for a history test . what fraction of study time remain? answer: 13/21 3. least common multiple

50. ## chem

copper has two naturally occurring isotopes. Cu-63 has a mass of 62.939 amu and relative abundance of 69.17%. Use the atomic weight of copper to determine the mass of the other copper isotope. How do I do this? Atomic weight=62.939*.6917 + x (1-.6917)

51. ## chemisty problem help

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 70 pm. Calculate the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus? Can someone tell me how

52. ## pre algebra

14 is what percent of 200 100/200 =x/14 read as 100% is to 200 as x% is to 14 solve for x by cross multiplying x=7 check it .07 times 200 = 14 vola!

53. ## math

can some one please help me with the following questions as i don't understand them please (a) write down the derivative of each of the functions f(x)=E7x and g(x)=cos(2x) using the product rule differentiate the function k(x)=E7xcos(2x) (b)write down the

54. ## science

What makes the subject of star formation so difficult and complex A It is so slow that no visible proof of of it exists B Star formation is too expensive to study in detail C Stars live too long to be observed from birth to death D Clouds, fragments,

1 four buttons have diameters of 5/8 , 3/4, 9/16, and 7/8 which buttons is smallest? answer 9/16 2. I spent 1/3 of my time doing math homework and 2/7 preparing for a history test . what fraction of study time remain? answer: 13/21 3. least common multiple

56. ## communications

First, realize that all of us make mistakes. Your letter should be polite and to the point. Explain the situation and the solution you want, i.e., corrected checks at no fee and the fee charged taken off your account. Your local bank made a mistake on your

57. ## Math

How do I draw Ten Base blocks to show the number 420?

58. ## math

How do I draw Base Ten Blocks to show 420?

59. ## physics

Please could someone advise me on answering this question. I need to explain why when infrared radiation falls on fluorescent material no visble light is emitted. Is this something to do with infrared being at the lower energy end of the spectrum? I would

60. ## physics

What's inertia? Inertia is the tendency of an object at rest to remain at rest; or the tendency of an object to continue moving if it is moving. In plain language, it's the tendency of an object to want to continue doing whatever it's doing. I had a

61. ## math

would someone check these please 1. find the square root of 25 answer 5 2. find the median of the following set of numbers 33,72,23,27,77,68,85 answer 68 3. find the mean of the following numbers 13, 15,18,18,18,19,22,26,28,33 answer 21 4. find the mode

62. ## Math

Rates And unit rates 120mi. to 10 gal of gas I'm not sure what you are asking, but this reduces to 12 miles per gallon. Does that help? If not, repost your question in different terms. Thanks for asking.

63. ## critical thinking

what is the rhetorical device for: What is the difference between "sugar free" and "no sugar added"? sugar free means no sugar at all and non sugar added means it has natural sugar nd they don't add any extra bob do you know what the rhetorical device used

64. ## Math- finding equation

Can someone explain to me how to find the equation pf the line in the form Ax + By + C =0 if a) parallel to x=3 and passes through (-4, 3) b)perpendicular to y=4 and passes through (1, 1) c) passes through the x-int of y=2x-6 and y-int of y=-3x+6 If it is

65. ## science

what is the difference between a theory and hypothesis? I got this off another site i hope it helps.. Scientific Laws, Hypotheses, and Theories Lay people often misinterpret the language used by scientists. And for that reason, they sometimes draw the

66. ## correction of math

can someone correct this for me please. Directions: Solve the system by substitution. x + y = 12 y = 2x this is what i did: in the first equation i substituted y for what i have in the second equation so now it looks like this: x +2x = 12 3x = 12 x = 4 now

67. ## correction of math

rewrite the equation 2x-3y= -6 as a function of x. My answer. f (x) = (2)/(3) x + 2 No. 2x=3y - 6 divide by two. x=3/2 y -2 hold on i was looking it over. wouldn't it be: 2x-3y=-6 would actually be: -3y=-2x-6 y= 2/3x+2 because you said that it would be

68. ## percent

how to change percentage to numbers Move the percent sign two places to the left. Add a decimal point there. Actually, don't move the percent sign at all. Get rid of the percent sign. Think about what percent means: Per (each) Cent (the prefix meaning 100.

I got this question marked wrong on a paper. Unfortunately, my prof didn't explain. _________________ subtances can pass through the plasma membrane. I put "nonpolar". What is wrong with this and does anyone know the correct solution/answer? Thanks all.

70. ## microeconomics

If the price of oil falls below \$50 per barrel, then the supply of the goods and services whose poduction involves a lot of oil will increase. The incresase in supply will cause the prices for these goods and services to fall. True, False or Uncertain.

71. ## microeconomics

If the technology for producign a good improves and at the same time,the price of a substitute good falls, then the quantity bought and sold of the first good will increase. True, False, or Uncertain. Explain. Take a shot. Hint: draw existing supply and

72. ## microeconomics

Other things equal, a big increase in the mimimum wage would cause the quantity demanded, but not eht demand, for unskilled labor to decrease. True, False, Uncertain, Explain Take a shot. Hint: a change in demand is a shift of the demand curve, a change in

73. ## ETH123

What are the most significant similarities between the Chinese American and Japanese American [cultural] experiences? What are the differences? Please refer to this post, recently answered: http://www.jiskha.com/display.cgi?id=1170193455 =)

74. ## Verb tense

As of December 1, Ira and Sandy will have been going together for three years. If you mean last December, then it should read "As of December 1, Ira and Sandy have been going together for three years." If you mean the next time we get to December 1 (in the

75. ## science

How long does it take an M type star to form, compared to the time for a solar type star to form? A half as long B about the same time C twice as long D 20 times as long E 200 times as long dont know........ look at google

76. ## combinaations of functions

f(x)=x2+1,g(x)=x-4, (f-g)(-1)

77. ## socal

if i have to do reserch about french guiana and i cant find information on the internet or books. what should i do Thank you for using the Jiskha Homework Help Board. Not to worry on French Guiana! I have more if you need it, but here's a start for you:

78. ## french

can you tell me which words are feminine or masculine radiateur miroir joueur du cd calendrier réveil boîte des bijoux lampe téléphone mobile vêtements bouteille de l'eau many thanks Thank you for using the Jiskha Homework Help Forum. First of all, if

79. ## geography

Whats a good site to go to get information about a county? The information is just the capital, culures, stats, basic information that's all. Thanks

80. ## Biology

Is there a difference in muscle tone between the dominant forearm and the other forearm? This would depend on how much each arm is used or exercised. If the person greatly favors the either arm, that arm would have more "muscle tone." In exercising, many

81. ## Science

What landform is created when plares separate? a ridge is formed...EX: Mid-Atlantic Ridge Check this site. http://geobytesgcse.blogspot.com/2007/01/plate-boundaries.html like i said above a ridge is formed!!!!

82. ## Math

Amayor has a friend in publishing who tells him they have just published 20 new books and tells him he may pick 10 of them. a.) How many different selections can the mayor make? b.)If the govenor picks ten distinct books, how many ways can he make his

83. ## Chemistry

Can someone explain in easier terms the spontaneous process, entropy, and free energy. The textbook is hard to understand. Just a simple explanation. Thanks. Appreciate it! Free energy is the amount of energy that can be released in a chemical reaction. If

84. ## ALGEBRA2

100Y^2-4Z^2 What is the problem? Factor? It is a difference of two squares.

85. ## windows 2003

You create a new folder called Catalogs on the second drive in the server and copy the 50 catalog files into that folder, and then you immediately create a differential backup of the entire drive and store the tape for archive purposes. That night, you

86. ## Science!

Which would spoil more quickly ground beef or steak? You have to define "spoil". If you mean bacteria that grows in the presence of air, then ground beef. It has been stirred up, bacterial mixed throughout, and exposed to air. yea that's what i mean

87. ## science

What steps do you think can be taken to reduce the harmful effects of human activities on biogeochemical cycles? Which businesses would these changes impact the most? To assess the harmful effects of human activities, you first need to know about the

88. ## pre algebra

10 is what percent of 200 20%

89. ## correction of math

given f(x) = 5x - 3, find f (-1). My answer: f(-1)= 5(-1)-3 = -5-3 = -8 correct