1. Math Homework

1) Given the side of a square pyramid is 6cm and the altitude is 4cm calculate the surface area. 2) Given the side of a square pyramid is 12cm and the altitude is 8cm calculate the surface area. 3) Given the side of a square pyramid is 18cm and the

2. Chemistry - Rate Determining Step

The rate law for the reaction 2NO (g) + Cl2 (g) -> 2NOCl (g) is given by rate = k[NO][Cl2] A mechanism involving the following steps has been proposed for the reaction: NO (g) + Cl2 (g) -> NOCl2 (g) NOCl2 (g) + NO (g) -> 2NOCl (g) If this mechanism is

3. chemistry

Vectors A B, and C satisfy the vector equation A+B=C and their magnitudes are related by the scalar equation A2+b2=C2. How is vector A oriented with respect to vector B. answer: is it vertors A & B must be at right angles to each other.

4. Standing waves and resonance (physics)

A nylon string has a linear density of 7.2g/m and is under a tension of 150N. The fixed supports are 90cm apart. The string is oscillating in the standing wave pattern. Find a)speed b)wavelength c) frequency v=sqr(F/u(linear density) v=sqrt(150N/7.2g/m) =

5. Poetry question

Poems that use onomatopoeia arouse the sense of: sound, touch, smell or sight? Doesn't poems that use onomatopoeia ariuse the sense of sound? I think that it is sound. It is a word that is used to create a sound effect. for example sizzle, snap sorry- I

6. Chemistry

CO + 2*H2 --> CH3OH How many moles of each reactant are needed to produce 3.60 x 10^2g CH3OH? I appreciate anyone who helps me with this. Also, please say the steps on how you got your answer. Balance the equation. I think it is balanced. Convert 360 g

7. Chemistry

If a solution were to change its composition during freezing how do you think this would change the cooling curve.

8. science

calculate the amount of heat evolved in the complete oxidation of 8.17g of Al at 25 degrees C and 1 atm pressure. change in H for Al2O3 is -1676kJ/mol. 4Al(s) + 3O2(g)--> 2Al2O3(s) please giv me the steps to solving this thanx. delta H = -1676 kJ/mol How

9. Tragedy of Julius Caesar

I need to create a list of power shifts, starting from the opening scene of Act I. It's supposed to follow the exchange of power throughout the play. I'm having trouble knowing exactly who to include. For instance, in Scene I Act I - they would want the

10. math (conversion)

how do you conver ug/ml to ug/ul? There are 1,000 uL in 1 mL. So 1500 ug/mL = 1.500 ug/uL or in detail-- 1500 ug/mL x 1 mL/1,000 uL = 1.500 ug/uL. Thank you Dr. Bob222

11. Chemistry (Check)

Classify each of these statements as always true, sometimes true, or never true 1)___AT_____A mole of a pure substance contains 6.02 X 1023 atoms. 2)____ST____The representative particle of a compound is the molecule. 3)___NT_____A mole of CCl4 is composed

12. chem

The activation energy of a certain reaction is 30.3 kJ/mol. At 20 C, the rate constant is 0.0130 s^{-1}. At what temperature would this reaction go twice as fast? Can't you use Arrhenius' equation for this. Look it up. You have Ea. you have T1. You have k1

13. Science

An investigation was conducted to study the effect of the concentration of a reactant on the (trial) time need to complete a chemical reaction. Four trials of the same reaction were performed.In each trial the initial concertration of the reactant was

14. humanities

what are the human and physical features of niagra falls http://en.wikipedia.org/wiki/Niagara_Falls Other than the fact that Ontario, Canada, is on one side of the falls and New York, USA, is on the other, I can't think of any "human features" of the

15. Chemistry- Mass Question

What is the mass of 0.005 moles of camphor, urea, and potassium ethanoate? Thanks in advance. You need to look up the formula of camphor, urea, and potassium ethanoate. Then g = 0.005 mols x molar mass of each.

16. Chem

Superscript 15 How many moles of Pb is 9.3 X 1015 atoms of pb? 1 mol of Pb atoms will contain 6.02 x 10^23 atoms of Pb. So 9.3 x 10^15 atoms x (1 mol/6.02 x 10^23 atoms) = ? note how the unit "atoms" cancel leaving mol and that is the unit we want. thanks

17. english

How can I make this better? The prompt is to explain how the author uses narrative voice and characterization to provide social commentary in "The Other Paris" To find story search 2003 AP English Literature and composition free-response questions #2 Mavis

18. math

how do you diverse fractions to decimals and visa versa Just take the top number and divide it by the bottom one. For example, if you have 3/10, take 3 and divide it by 10, giving you .30 and this is 30%. Oh, the the other half, if you have a decimal. .1

19. chemistry

help needed in drawing the diagram to show how hydrogen has numerous spectral lines I also need help with this question.... ---------------- ---------------- ---------------- ---------------- ---------------- -------------------- Each line above represents

20. Physics

Four balls are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 95 N on the wall to which it is attached. The tensions in the shorter cords are T1 = 56.0 N (between ball A & B), T2 = 46.7 N

21. Susane

Two identical traveling waves moving in the same direction are out of phase by pi/2 rad. What is the amplitude Y of the two combining waves. I have no clue how to do this. The answer according to the back of the book is 1.4y max. If you could explain to me

22. Physics.. last one.

Four balls are suspended by cords. The longer, top cord loops over a frictionless pulley and pulls with a force of magnitude 95 N on the wall to which it is attached. The tensions in the shorter cords are T1 = 56.0 N (between ball A & B), T2 = 46.7 N

23. waves (physics)

Two sinussoidal waves identical except for phase travel in the same direction along a string and interfere to produce a resultant wave given by y(x,t)= (3.0mm) sin(20 rad/m)x - 4.0rad/s t + 0.820 rad) with x in meters and t in seconds. What is a) the

(-2x^2y)^3*(5xy^3)^2=(-2x^2y)^3 = -8 x^6 y^3 *Please check my work. What did you do with the (5xy^3)^2 part. The first part you did ok. But you can't just throw away part of the equation. I don't get that part.What do I do there.? (5xy^3)^2=25x^2y^6 You

25. chemistry

I was asked to bring something into class with a pressure less than 1.0 atm, after researching i found out that if I heated a bottle it will shrink and therefore this bottle will have the needed pressure. the problem is that after I put the bottle inside

(2sqrtx)(5sqrtx^3) Here is what I got:10sqrtx^4 *Is this correct.? This one is close but still needs to be simplified further. 10√x^4 -->you can take the square root of x^4. Can you take it from here to finish? so it will be:10sqrtx^2 No, remember you

1. Which line is the flattest (or is less steep)? Why? a.y = 5x -6 b.y = 5x + 6 c.y = x - 3 d.y = 1/2x + 3 I think It is C.It has the smallest slope. Someone Please Help me! ...Help me... Doesn't d have the smallest slope? 0.5x. Please...I just want to

28. Children's Literature

Asking your students to show you how the fox in "Hattie and the Fox" felt encourages which development? 1. personality 2. intellectual, 3. social and moral 4.aesthetic creative Wouldn't it encourage social and moral development in students? 2 or 3 would

29. chemistry

The tail of A vector is fixed to the origen of an X, Y axis system.Originally the vector points along the X axis. As time passes, the vector rotates counterclockwise. Describe how the sizes of the X and Y components of the vector compare to the size of the

30. Science - DrBob222

After helping me to understand this, could you please tell me the specific names for these functional groups: AMINE: NH2 AMIDE: H-N-C=O Thank-you A carbon atom with a -NH2 group attached is an amine. Examples are ethyl amine, methyl amine, etc. ethyl amine

31. Science

What is the used to demonstrate that the DNA molecule is a helix?

32. More Math2(MathGuru)

5. Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. a. y = 3x - 6 b. 6y = -x + 2 *What do I do here.?

33. Modern World History

Was the World War 1 avoidable? All wars are avoidable. But if one person, group, or nation decides to conquer another nation, then the victim needs to decide whether to surrender or fight. What do you think? Could World War I have been avoidable if the

34. World Geography

What is the major ethnic group of south Africa the country? The Zulu are the majority ethnic group

35. Math for Trish To Help Me With

Factor the following. You will earn 5 points for each polynomial that is factored correctly. Please label your individual answers with a – f. a.) 4x2 - 25 b.) 3x2 + 6y c.) x^2 - 7x + 10 d.) 2x^2 - 9x – 18 e.) 2ax + 6bx + ay + 3by f.) 6x^2 + 12x – 48

36. Chemistry

Consider the reaction A ==> B. If the reaction is first-order in A with the initial concentration A being 6.048M, what is the concentration of A after 1.986 seconds if the rate constant is 0.483s-1? Error tolerance: ±0.5% Can someone explain how to do

37. Please Check My Math Work

(3sqrt5)(2sqrt10) I got:6sqrt50 Is this correct.? You can take this one step further. 6√50 can be simplified to this: 6√(25 * 2) -->you can take the square root of 25. 6 * 5 √2 = 30√2 -->this is the simplified form. thanks can you help me with my

38. english

http://en.wikipedia.org/wiki/Thomas_paine Try Thomas Paine's Common Sense. =) I have the same assignment as Carli!! I need a "writing that changed the world," only it HAS to be an excerpt from a book....help me!!! You might look at the Bible - perhaps the

39. chemistry

Hi, Can anyone please tell me how to convert cm3 into litres? Thanks ;) worked it out! Cheers ;)

40. chemistry

The gase in a mixture have the following partial pressures at the same volume and temperature, 1013000Pa nitrogen, 700mm argon, 1.20atm helium, 790 torr oxygen, and 0.50 atm of carbon dioxide. What is the total pressure of tyhe mixture in atm? You add

41. Opinions need aboput world war one!?

The initial cause of WW1 was the assassination of Archduke Francis Ferdinand of Austria-Hungary. What do you think of this statement.? As this site says, the "trigger" was the assassination.... however, there were many causes...

42. science

an oxide of arsenic = 0.927g 76% arsenic and 24% oxygen calculate the mass of oxygen that combines with one mole of arsenic atoms to form the oxide of arsenic. How many moles of oxygen atoms does this mass represent? Posted by Kirsty on Tuesday, February

43. chemistry

me again! got a question that really is trying! the isotope of ununhexium Uuh and it undergoes a succession of seven a-decay reactions. I need to find out what the final isotope would be as a result. And is the final product a lanthanide, an actinide, a

44. Algebra 2

What is the determinant of -2 -3 5 0 15 How you get 15 Use the definition of a determinant. From the first column you take take the element that is in the position of a permutation of 1, from the second you take the element that is in the position given by

45. Chemistry

Count the electrons. HCN I see 10. NCCN I see 18. What noble gas has an atomic number of 10? of 18? State the noble gas whose electron configuration is attained in the following Lewis structures. a) H:C:::N: (cyanide) b) :N:::C:C:::N: (cyanogen)

46. Math

What is a reciprocal A number's "flip". Like if you have 2/3, it's reciprocal would be 3/2. If you have a whole number like 5, for example, than it is understood that there is a 1 under the 5. (5/1) This means that the reciprocal of 5 is 1/5.

47. Physics

Trolley B will be at rest and trolley A will be given a push such that it collides with B, and they both move as one mass after the collision. As soon as the blocker of the picket fence on trolley A passes through the eye of the first photogate, trolley A

48. chemistry

If, for a second-order reaction, the elapsed time after the first half-life is 338.871 seconds, the elapsed time after four half-lives would be (in minutes)... t1/2= 1/k(A). k= 1/t1/2*(A)=1/338.871 s(1) (I let (A)=1). k = ?? After 4 half lives, beginning

49. Health Project Ideas

As a health project, I have to make some sort of presentation expressing ANYTHING in health. Like I have to make a poster on the circulatory system or something but I don't want to do something so easy. Could you help me with some possible ideas, or like

50. math magic square

on a four by four grid distribute the numbers 1 through 8 and -1 through -8 so that all horizontal, vertical and main diagonals equal zero http://mathworld.wolfram.com/MagicSquare.html You have to b a smart kid to answer this soo you cant you silly person

51. economics

how is marginal utility found? Marginal utility is the change in total utility divided by the change in the quantity consumed of a good. MU=ChangeinTU/ChangeinQG

52. Science

PLEASE HELP ME!!!!!! I need to know at least 5 things about the puriotic table. PLEASE!!!!! Here is a periodic table on the web. Look on the left hand side and scroll all the items listed there. There are many many items listed; i.e,many more than five.

53. science

How do work out what the empirical formula for aluminium selenide is? You need to provide the data. It's easier to explain with numbers than try to go through it with words. You do you not have numbers? Perhaps the question is, "How do we know what the

54. language!

I have to write an essay and my topic is "writing that changed the world." It can be a speech, article, essay, or excerpt from a book. I just have to explain something that resulted because of it. I've looked on many websites and I can't find anything I

55. chemistry

Hi, Is the molecular formula different when it is in a gaseous state? Cheers ;) Sometimes yes, sometimes no. H2O, for example, is thought to be in a group of 6 as a liquid at room temprature, a group of 4 at higher temperatures, and single H2O molecules as

56. chemistry

I need help in drawing a structual formula for hydrogen cyanide(HCN)and cyanogen(CN)2, the drawing has to bear in mind the valencies of hydrogen(1),nitrogen(3) and carbon (4), any help appreciated H:C:::N: :N:::C:C:::N: Check my thinking. The previous one,

57. find polynomial

zeros are i and (1+i) degree of the polynomial 4 constant term 12 How do i do it? (x+i)(x-i)(x-1-i)(x-1+i)=0 ? Where does the 12 go? Thanks Where does the 12 go? Substitute x = 0 and find out what the constant term is now. Then multiply the polynomial you

58. Of mice and men

Would you say that the diction is simple and straight forward? The text is pretty easy to read and comprend. Steinbeck's style would be described as what? http://college.hmco.com/english/heath/syllabuild/iguide/steinbec.html Read especially the section

59. Humanity

Religion can affect people in many different ways. List at least two effects that organized religion has had on society and give examples from past and/or present world events that illustrate your examples. The Middle East is ripe with examples. As in the

60. Science

what messenger RNA attaches during protein construction?

sqrt2/sqrt10 here is what I got: sqrt (2/10)= sqrt (1/5) sqrt 0.2 * I don't think that it is right but pleasee check it.Thanks Yes, that is one way you could do it, then simplify further by taking the square root of 0.2, but you are probably supposed to

62. Science - DrBob222

tocainide – a drug that has been used to restore a regular heartbeat in patients with arrhythmia. .................................. ….....CH3.........O............. ......__/...........||............ .....//\\_______N___C___CH___NH2..

63. SCIENCE CHECK

Pleas check the following for me... "A drop of oil (vol 0.051cm ) is released on to the surface of a pond where it covesr an area of 40cm2. Assume that the oil film has a uniform thickness equal to the diameter of an oil molecule. Calculate the diameter of

64. Cause/Effect Essay.

I need some ideas for a cause and effect essay. It needs to be complex enough to get five paragraphs from it - but not so complex that I go much over that. My text says that it can be on any subject. I'm just having a hard time coming up with one. Any

65. math (mixed #'s)

find the value of n.n + 5 3/10 = 8 1/10??????????Please Help!!!!!! As above ... n + 5 3/10 = 8 1/10 Subtract 5 3/10 from both sides; result will be n = the subtraction answer. =)

66. ????MATH QUESTION

How is The Pythagorean Theroem and the Distance formula the same?

67. chemistry

The temperature at which a reaction is running is increase from 11.052 celsius to 102.567 celsius. If the rate constant increases by a factor of 5.608, what is the activation energy of the reaction in kJ/mol? Use the Arrhenius equation. I AM STILL LOST The

68. Thanks TRISH

thanks...even though you didn't help me with that you still helped me.. You're welcome. Like BobPursley told you, I just can't give you the answer. Not only is it not what this site is for, you would never learn anything, and like he mentions, it is

69. Physics .. help!!

Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine provides an upward force (thrust) of 3270 N, the craft descends at constant speed; if the engine provides only 2190 N, the craft accelerates downward at 40

70. tight junctions

prevent the contents of the intestine from mixing with bodily fluid on the other side of the epithelium? The statement you made could be true...I'm not exactly sure what you were trying to ask, though... sorry, was asking if tight junctions prevent the

71. math

You inherit \$18750 but the conditions are that for the first year, the money must be invested in two stocks paying 10% and 11% interest, respectively. How much should be inbested at each rate if the total interest to be earned for the year at \$1962.51? Be

72. Geography

is most of the United States in the Eastern Hemisphere or the Western Hemisphere? Thank you! United States is in the Western Hemisphere

73. Criminal Justice

Can someone please tell me what social disorganization theory is? And what its principles are. Because I've tried looking it up online,but something about neighborhood keeps popping up. Thank you. Thank you for using the Jiskha Homework Help Forum. Here is

74. Clac ii

integral of tan^5(2x)sec^3/2(2x)dx Y^11/11 - 2/7Y^7 + 1/3Y^3 where: Y = (1 + u^2)^(1/4) and: u = tan(2x)

75. cHEMISTRY

GIVE THE EMPIRICAL FORMULAE OF THE HIGHEST HYDRIDE AND HIGHEST FLUORIDE OF UNUNHEXIUM, EXPLAINING HOW YOU ARRIVED AT YOUR CONCLUSIONS Here is the web site for a very good periodic table. Look for element #116, Uuh. Elements in the periodic table have

76. Physics - bobpursley

Imagine a landing craft approaching the surface of Callisto, one of Jupiter's moons. If the engine provides an upward force (thrust) of 3270 N, the craft descends at constant speed; if the engine provides only 2190 N, the craft accelerates downward at 40

5. Find the x and y intercepts of each linear equation. Be sure to write your answers as ordered pairs. a.y=3x-6 b.6y=-x+2 Set x = 0 and y = 0 to find the intercepts. will that get me 2 thingys for each.? Again, you should show your own answer first, but

78. Science

"Lactose is made up of 1 mol glucose & 1 mol galactose with a glycosidic c-1 to c-4 linkage..." Please explain to me what a GLUCOSIDIC C-1 to C-4 LINKAGE is. Much appreciated. This site will show the linkage.

79. Chem(again)

What is the relationship between the amount of solute and the amount of freezing point depression? delta T = kf m where delta T is the difference between the normal freezing point and the f.p. with a solute, kf is the freezing point constant, and m is the

80. mixed #'s

Find n. n+n=8 1/2 what does n =??? n+n = 2n

81. Math

What formula do I need to use to find the missing length of right triangles? Please help. a^2 + b^2 = c^2

82. Math(I Don't Get THIS!!)

15sqrt8x^16/5sqrt2x^4 *I totally need help with this one!Please help me.! I'm going to assume your problem is this: 15√(8x^16) / 5√(2x^4) You can start by simplifying what's outside the square root sign. 15/5 reduces to 3/1. We end up with this:

83. Pleas Check More Of My Work(MathGuru)

1. Which line is the flattest (or is less steep)? Why? a.

84. Chemistry

I know that Ununhexium is in period 7, group 16. What evidence would be able to support this? Here is a web site for an on-line periodic table. Look for Uun, element #116. That will give you the info you need. http://www.webelements.com/

how do i simplify comlex fractions, like this one: ((5/x)-(x/x-1)) / ((x/x+1)+(6/x)) These are strains...you strain. Start with the numerator ((5/x)-(x/x-1)) Multply by x(x-1)/x(x-1) That simplifies it some. Then the denominator: multiply be x(x-1)/x(x-1)

86. math (conversion)

convert mM to uM The capital M should be written as a lower case m. There are 1,000 um in 1 mm.

87. religion, help

How are newer religions different from older ones? How are they similar? can anyone help me with this one. or help me find a good website for it. I know the basics. older religions have been around longer than the newer ones. the only similarity is that

88. maths

1x+2y=5 3x+7y=18 x= y= Multiply equation 1 by -3, add to equation 2 (which eliminates x), then solve for y. Use that value in the other equation to solve for x. Post your work if you get stuck AND explain in detail what you don't understand.

list at least 3 alternative methods for mazimizing food production in benin (africa) pros & cons These sites will help you make your lists. (Broken Link Removed) http://www.foodfirst.org/media/opeds/2000/4-greenrev.html

90. science

What is the goal of surround sound? To get sound 360o. We hear sound naturally from ALL directions. The goal of surround sound is to make it sound as if it is coming from all directions.

91. Literature

why not #1? "Island Boy" by Barbra Cooney, is a good choice for literature curriculum in the primary grades because it: 1. is useful in all areas of development 2. is easily understood by students 3. provides beautiful illustrations 4. includes a setting

92. Math

What is the determinant of 1/10 1/5 1/8 1/3 as a fraction

93. Question

Where are the rest stops/gas stations located along the highway? Why? Plz help, asap. Thanks so much. next to overpasses of different interstates/highways/roads (that's why gas stations are mostly on the corner of 4 way intersection in towns and such..)

94. math

Suppose that we strike a bargain, and we agree that in this chapter, for every problem you do right, I will pay you \$.86 and that for every problem you do wron, I will fine you \$.47. After 28 problems, you have a nice sum of \$9.45 in your pocket (and I am

95. Chemistry

suppose that ununhexium undergoes a succession of a-decays reactions. What isotype would be the final product? how did you arrive at this answer? and is it a lanthanide, actinide, transition or typical element? See the post above as a response to bertie.

96. s.s.......... help me

in the 1860's ( in ur opinion) would u have voted to impeached johnson? why or why not ? The key word in that question is YOU. If you answer the question, then we will be happy to proof-read or make suggestions regarding your answer.

97. Science

Why is the colour of the light emitted by an element in its gaseous state characteristic of the element? And why does hydrogen with only one electron have so many spectral lines? I have some idea but I need to clarify my understanding against someone

98. soclal studies

how were goods and services traded by barter I teach your children how to read and write; you provide me with room and board for the school term. It's a trade! =) what tools do Native Americans used? it is chaper ten

99. multiplying fraction

what is 3/7 * 2/10= and 5/6*2/3= , 1/2*1/4=,4/5*3/5=,2/3*3/8=,1/7*5/9= (Broken Link Removed) 3*2 = 6 7*10 = 70 Answer to the first one is 6/70. Then you'll need to reduce the answer; divide both parts by two, and you'll have 3/35. Do the others the same

100. literature-the feminine mystique

I am currently reading the Feminine Mystique by Betty Friedan for language class. I need only one passage that is the most important one of the book...problem is, I don't have the book with me haha! If anyone has it, and has read it, they would be a

102. TO BOBPURSLY

THANK YOU SO MUCH FOR SUCH INCOURAGEMENT. I'm only trying my best because i want to understand all the concepts correctly so like this i don't have worries when my final comes up.