# Questions Asked onNovember 2, 2007

1. ## PHYSICAL SCIENCE

A 1.0 kg metal head of a geology hammer strikes a solid rock with a velocity of 5.0 m/s. Assuming all the energy is retained by the hammer head, how much will its temperature increase?

2. ## chem

I have the following problems- write net ionic equations for reactions if no reaction write NR.... silver nitrate and ammonium carbonate sodium phosphate and potassium nitrate silver nitrate and barium chloride copper (II) chloride and sodium hydroxide

3. ## Physics

A snowball is launched horizontally from the top of a building at v = 15 m/s. If it lands d = 44.5 meters from the bottom, how high (in m) was the building? For this problem, do I need to solve for any other velocities? I'm a little stuck...I'm not quite

4. ## science

How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 700. mL of 1.294-M solution of NH3 in order to prepare a pH = 9.70 buffer? (pka of NH3 = 9.25)

5. ## Algebra 2- reposted no one answered

look at the function and answer the questions. x y -3 2 -1 0 0 5 1 2 2 7 What is x when f(x)=2 ? What is a zero of this function?

6. ## Calculus I

Find the point on the curve y=x^2 closest to point (0,1) Here's what I have: Sqrt {(x-0)^2 + ((x^2)-1)} Sqrt {((x^2) + (x^2)-1} d= sqrt (x^4)-1 y= (x^4)-1 Fprime(x) = 4x^3 Domain = ARN Critical Number x= 0 Any help or comments would help alot. Thanks!

7. ## Economics

Consider the following two country-two goods world, with a single input, labor: Daily production per worker Commodity Portugal England Wine (barrels) 2 OR 1 Cloth (bolts) 4 OR 3 a) Does either country have absolute and/or comparative advantage in any

8. ## chemistry

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (H2SO4 from "concentrated" (18M) sulfuric acid) ? I am stuck on how to work this one out. thanks

9. ## Physic

an someone please help me out on this... An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: 1. The volts ac available at the secondary 2. Current in the 10  device connected to t

10. ## chem

how much of each of the following substances would you add to water to prepare 1.20L of a .85M solution? (sodium carbonate from the pure solid) ? I am stuck on how to work this one out, too. thanks

11. ## Physics

A rescue plane has to drop supplies to a group of castaways who are stranded on a deserted island. The plane is flying as 150 m/s at a level altitude of 1200 m. How far ahead of the landing zone should the plane release the supplies? I'm not even sure how

12. ## Anatomy

I can't find the answer in the paper my teacher gave me, hopefully you guys know it allready >_

13. ## physical science

Can someone explain this to me. Element D has 6 protons and 7 neutrons Element F has 7 protons and 7 nuetrons are the pair isotopes or different elements

14. ## english

please send acomposition on 'my memory box' urgently.the composition is according to grade 5.thanks

15. ## ochem lab

this deals with TLC chromatography: if 2 compounds have same Rf under identical conditions, does it show that they have identical structures? i think it does. but im not sure why. thanks mucho.

16. ## science

in an atom electrons move in definite orbits around the nucleus much like planets cirlce the sun. who said this - I think Bohr choices are: Bohr rutherford wave model Thompson democritius

17. ## maths

consider the sequence given by U1=-0.3 Un+1=Un+0.7 i)state what type of sequence this is. ii)write down the first 4 terms of the sequence. iii) find a closed form for sequnce. iv) use the closed form to find the nth term of the sequnce when Un=36.1

18. ## A physics question

I was researching amusement park rides for a recent project (from this site I have noticed that many others are in the same boat as me). Anywho, I am doing the Ferris wheel or the Giant Wheel, and I was wondering if this was right, with respect to

19. ## human resources

two aspects of a performance appraisal from the following list. What are the special challenges in each area and what would be the impacts on employees and employers if the challenges were not addressed? o Strategic Relevance o Criterion Deficiency o

20. ## science

an atom is made of a positively charged nucleus surrounded by a large region in whci hscientists can predict where an electron is likey to be found. I think this is attributed to rutherford choices are: rutherford, wave model, thompson, dalton or bohr.

21. ## Biology

Would the most common traits always be dominant?

22. ## Child development and Skills

Can you help me with this question? ___________ is a caregiver strategy in which the adult's verbiage for labeling, describing, and personalizing an adult-child shared experience promotes cognitive and linguistic skills. Would it be: fine-tuning (or)

23. ## Inorganic

Hi, I have an lab I am doing in inorganic chemistry and it is where we synthesized our own compounds by adding together a bunhc of differnt ones. We are now asked to calculate the theoretical yield and they tell us which one is the limiting reagent. My

24. ## science dr bob

I thought i was done but I am confused on these two. 1. In a natom electrons are located in energy levels that are a certain distance from the nucleus. I put rutherford. and I am still left with atoms are small hard particles - wave - rutherford -democrius

I'm writing an essay about charity (which means "In its widest and highest sense, charity includes love of God as well as love of man. The latter kind of love is so closely connected with, and dependent upon, the former, that neither it nor its fruits,

26. ## science

regarding the term nucleus using the follwoing words size ?? density ?? charge - I put positive location - I put the core of the atom Rutherford ??

27. ## ap chem

if you want to get rid of ammonium chloride chmically what would you react with it and/or dissolve it in?

28. ## physical science

Thanks got through all but one Element P has an atomic number of 92 and atomic mass of 238. Element s has 92 protons and 143 neutrons. atomic number and protons are the same would htese two elements be an isotope or different elements

29. ## Physics

A string of length 50cm is used to hang a picture frame from a nail hammered on a smooth wall. The frame is 20 cm wide and weighs 10N. It hangs symetrically. The angle which each part of the string makes with the vertical is 23.6. - State the magnitude and

30. ## Statistics- PEASE help!

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

31. ## Calculus

26. Find all points of inflection. f(x) = (5x-3)^(1/3) Note: I have gotten f''(x) = (-50/9)(5x-3)^(-5/3) I would like to know how to figure out the zeros.

32. ## Physics

Salmon, swimming up the Fraser river to their spawning grounds, leap over all sorts of obstacles. The unofficial salmon-altitude record is an amazing 3.58 m jump. Assuming the fish took off at 45.0°, what was its speed on emerging from the water? Ignore

33. ## Math Fractions Vocabulary

What is "one of two numbers whose product is one". It's in a crossword, 21 letters, 4th letter is "T". Please help!

34. ## PHYSCIS FO SHIZZLE

Hello, I was wondering how to explain the potential energy in a Ferris wheel, and if there were any reputable (aka not something such as Wikipedia, etc) that had an explanation for this? The only thing I have gathered is that mgh=Eg and that Eg is the

35. ## AED

describe the states role and influence has on curriculum

36. ## biology

is there a difference between heat capacity and specific heat capacity, or are they the same thing?

37. ## human risk assessment

What is meant by inhalation reference concentration (RfC)?

38. ## math

how do solve this problem 0.7w+16+4w=27.28

39. ## chem

what is the formula that will be used for this ? what volume of .100 M NaOH will react completely with 24.00 mL of .900 M HCl?

40. ## science

an atom is the smallest piece of matter which model does this describe Democrtius dalton Rutherford Thompson Bohr Wave Model

41. ## science

Are these correct for Democritius Help so confused - I read site and still trying to figure out. atoms of same element are exactly alike an atom is mostly empty space with a dense - postiveily chareged nucleus These are the choices Rutherford wave model

42. ## French

We ask "Vous voulez un livre?" and then why do we have to answer by "Je n'aime pas les livres." can't it be "Je n'aime pas un livre"? Why does it have to be les instead of un?

I have to answer the following question: What is the role for Employees? In my notes is states 1. Primary source of income 2. employment status 3. interbal reward I do not uderstand the question or how to explain those above....any help would be

44. ## science

one example has Cl2 ( that is an L) the other has (OH)2 I still do not understand the difference if it has brackets or does not have brackets around it

45. ## Economics

One key development in the last two years has been the addition of countries like India to TRIPs. Nevertheless, developed nations have always been at odds with developing countries over IP protection. Why do these developed and developing countries’

46. ## Physics

1.How can you easily increase the magnetic field strength inside a current-carrying coil? 2.What is a magnetic domain? What is the difference between an ordinary iron nail and a permanent magnet? How does the idea of magnetic fields arising from

47. ## history

How did president Jackson change the power of the presidency?

48. ## Algebra

I need a function rule for the following: X Y -2 -2 0 1 1 2

49. ## Physics questions

Hello, I was wondering how to explain the potential energy in a Ferris wheel, and if there were any reputable (aka not something such as Wikipedia, etc) that had an explanation for this? The only thing I have gathered is that mgh=Eg and that Eg is the

50. ## COMMUNITCATION

EXAMPLES OF A COMPOSED POSITIVE MESSAGE

51. ## science

The question list each element and the numebr of atoms Mg(OH)2 Mg = magnesium What does OH with brackets aorund it mean and then the small 2

52. ## sarah science

why have he brackets around the (OH)2 and not just OH2 it ask to lsit each element and the number of atoms present.

53. ## science dr Bob

I think I might have gotten htese two incorrect atoms are small ahrd particles - I put Democritius An atom is the smallest peice of matter - I put Dalton Are these correct

54. ## grammar

what is a dialog

56. ## Economics

In recent years, talk has risen and ebbed about creating a FTAA (Free Trade Area of the Americas), encompassing countries in North, Central and South America. Based on the successes and failures of NAFTA evaluate whether the United States should

57. ## Anatomy

I forgot to post the other question I couldn't find. What are the relative sizes of braincases in humans and rats?

58. ## psychology/science

what is the full definition of sleep? What are some sleep disorders?

59. ## Physical Science

Drwls, would please explain more? I'm not getting this. Thanks

60. ## French

Another pronunciation question, blond and blanc sounds so similar, how to tell the difference?

61. ## math

1 meter equals how many millimetersm and how many centimeters

62. ## science

I choose these 3 as dalton atoms of same element are exactly alike atoms are invinsible atoms are smallest piece of matter choices were dalton rutherfird wave model bohr democritius

63. ## science dr. bob

An atom is made of positively charged pudding like material through whic hnegatively cahrged particels are scattered I put thompson - now I am not sure after reading winnepedia maybe rutherford??

64. ## Algebra 1

Give the slope of a line perpendicular to the given line. (how do you do it) y=3x+5

65. ## Algebra

I need help finding a function rule. X Y -4 -3 -2 0 0 3

66. ## psychology

In a grand mal seizure, what happens to a person's brain? What can the after effects be?

67. ## Math

How do you simplify this problem? (-3y)+(-2)+(-8x)+5y-(-8x)