# Questions Asked onApril 15, 2007

1. ## related rates with work shown

this is a relate rates problem in calculus in a right triangle, the hypotenuse is 5 and the vertical side is x and the angle is theta. so if theta increases at a constant rate of 3 radians per minute, at what rate is x increasing in units per minute when x

2. ## chem

a test tube containing CaCo3 is heated until all the compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment is 4.40 grams, what was the mass of the empty test tube? Write the

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

4. ## stat

the average number of pushups a United States Marine does daily is 300, with a standard deviation of 50. A random sample of 36 marines is selected. What is the probability that the sample mean is at most 320 push-ups? With a mean of 300, you are looking

5. ## physics - waves

Two sinusoidal waves, identical except for phase, travel in the same direction along a string producing a net wave y'(x, t) = (1.5 mm) sin(29x - 4.0t + 0.960 rad), with x in meters and t in seconds. (a) What is the wavelength of the two waves? I found the

6. ## science

Does anybody know any real life example of a nucleus Are you speaking of nucleus as in the nucleus of an atom or the nucleus of a living organism? If the former, the nuclear atom bomb or H bomb or the decay of radioactive materials to bombard some cancer

7. ## Chem

Carbonyl fluoride, COF2, is an important intermediate for organic fluorine compounds. It can be prepared by the following reaction: CO2(g) + CF4(g) 2COF2(g) At 1000*C, K for this reaction is .50. What are the partial pressures of all the gases at

8. ## Physics

A clown at a birthday party has brought along a helium cylinder, with which he intends to fill balloons. When full, each balloon contains 0.036 m3 of helium at an absolute pressure of 1.2 x 10^5 Pa. The cylinder contains helium at an absolute pressure of

9. ## physics

A pendulum consists of a uniform disk with radius r = 10 cm and mass 480 g attached to a uniform rod with length L = 500 mm and mass 175 g. (a) Calculate the rotational inertia of the pendulum about the pivot. (b) What is the distance between the pivot and

what's the difference between a learner's permit, provisional license, and driver's license/ Thank you for using the Jiskha Homework Help Forum. Here is the site for the DMV (Department of Motor Vehicles: http://www.dmv.org/ Select your state and then

Hemoglobin has a molecular mass of 64 500 u. Find the mass (in kg) of one molecule of hemoglobin. Thanks for your help, but I figured this one out on my own.

12. ## bio

what is the advantage of stopping mitosis at metaphase when making a chromosome spread? it is advantageous to stop at metaphase to view the chromosomes for chromosomal analysis. (is this sufficient?)

13. ## CHEM

Calculate the molar solubility of gold(I) chloride (Ksp= 2.0 x 10^-13) in .10 M NaCN. The complex ion formed is [Au(CN)2]- with Kf= 2.0 x 10^38. Ignore any other competing equilibrium systems. I'm having trouble writing an equation to start off with.

14. ## Physics

Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 10-2 m2, and the pressure outside the cylinder is 1.02 105 Pa.

15. ## Physics

Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 10-2 m2, and the pressure outside the cylinder is 1.02 105 Pa.

16. ## Health question

Is Lyme disease caused by a virus,parasite,or a fungus? Isn't it caused by a parasite? http://www.cdc.gov/ncidod/dvbid/lyme/ I know lyme disease is caused by a bacteria,but would that be a virus,or a parasite? Wouldn't it be a parasite?

17. ## math plz

hi, is there an equation to finding the perpendicular bisector of a line. for example i had a line b (1,1) and c(8,1) and a was (6,5) how would i find the bisector from a going through line bc? tnx first off, the slope of a perpendicular line is -1/m

18. ## Chemistry

I want to know the enthalpy change for this reaction which occurs in a blast furnace: Fe2O3(s) + 3C(s) --> 2Fe(l) + 3CO(g) You will need the heat of formation for CO, and ironIIIoxide, and the heatofmelting for iron. I suspect you have some temperature in

19. ## Physics please check repost

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

20. ## Science

What kind of problems does Rwanda have with its water supply? Please check these sites. http://www.engr.wisc.edu/cee/newsletter/2005_fallwinter/article03_ewb_program.html

21. ## AP CHEM-- check work?

How many moles of ATP must be converted to ADP by the reaction ATP(aq) + H2O ---> ADP(aq) + HPO4-2(aq) + 2H+(aq) delta-G*= -31 kJ to bring about a nonspontaneous biochemical reaction in which delta-G*= +372 kJ? I did my work out like this..: 372 kJ x 1

22. ## Chemistry

What is the relationship between the equilibrium and changes of state? You need to be a little more specific. For liquids, for example, in a closed system, the vapor pressure of the liquid reaches equilibrium between the vapor and the liquid.

Three moles of an ideal monatomic gas are at a temperature of 345 K. Then, 2531 J of heat are added to the gas, and 1101 J of work are done on it. What is the final temperature of the gas? delta U= 3/2nR(T final -T initial) (2531J - 1101J) =

24. ## math

how do u mutiply decimals and how do u make a decimal into a fraction do you mean long-hand?? write down the numbers the way you would whole numbers, skipping the decimal perform the multiplication as if you had no decimals count up the total number of

25. ## Biology

The main function of the circulatory system is absorption? True or false Since this is not my area of expertise, I searched Google under the key words "circulatory system function absorption" to get these possible sources:

26. ## Maths

There are x people in the bus. When the bus stops y people get off and 6 people get on. How many people are yhere now on the bus ? x = 6- y Is my answer right ? There are x people in the bus. When the bus stops y people get off and 6 people get on. How

27. ## math,help

how do you change the following decimal into a fraction. -3.6666666 3 2/3 or 11/3 Memorize .666666 repeating as 2/3 Now if the sixes do not repeat forever, the fraction can be found as 36666666/1000000 which probably can be reduced some... thats right

28. ## equibrium - help!

Consider the reaction CO(g) + H2O(g) CO2(g) + H2(g) Use the appropriate tables to calculate a) delta-G*f at 552*C b) K at 552*C I'm pretty sure I have a good idea of how to do this: I believe I can use Gibbs-Helmholtz equation to account for the

As a business owner, information can be one of your key assets. why must you,as a business owner manage information as a resource? How might the internet and related communication technology change your business? What are some of the ways that information

30. ## Biology-squid anatomy

Why do squids need to have three separate hearts? Since this is not my area of expertise, I searched Google under the key words "Squid anatomy hearts" to get these possible sources: http://www.thewildones.org/Curric/squid.html

31. ## math,correction

is this correct Find the constant term that should be added to make the following expression a perfect square trinomial x^2 + 7x My answer that i got was 12.25 Take half of seven, square it. 7/2 squared is 49/4. You are right. should i leave it as a

32. ## Chemistry

If barium nitrate solution is added to sodium hydroxide solution does a precipitate form? Are there exceptions? I have an assignment Q that asks about the precipitate, and I thought that Ba(OH)2 was soluble. Barium hydroxide is moderately soluble, up to

33. ## Health

My text book says Lyme Disease is a bacterial illness. So,is Lyme disease caused by a virus or a parasite? I'm thinking its caused by a parasite. Right. The ticks that carry the bacteria are parasites. http://arthritis.webmd.com/tc/Lyme-Disease-Cause

34. ## Chem (monomers)

Hi I'm having major problems with monomers in proteins. One what is a monomer Two what is it doing in a protien? Much thanks, Rosie A "monomer" is a single unit of a polymer and a polymer is just a bunch of monomers (single units) hooked together. Teflon

35. ## MATHS

Hi Just checking The area of one face of a cube is 64cm squared What it the total surface area of the cube? DO we do 64 times 6 and the answer is 384 cm cubed? Also it askes what is the volume I do 64 cubed which is 262144 cm cubed ? AM I right ? yes- the

37. ## math,help

The height h in feet of an object after "t" seconds is given by the function h = -16t^2+70t+8 How long will it take the object to hit the ground? round answer to nearest thousandth this is what i have -16t^2+70t+8=0 x = (-70 +/- sqrt (4388))/(-32) from

38. ## maths

simultaneous equations x + 2y = 4 3x - 4y = 7 x=3 and y = 1/2 i need to explain how i got this answer and do not know how to do that? i am confused about how you got this answer what working out is it the object in "elimination" is to get the coefficients

What are the age requirements for a person to be competent? I've known 12-years who are more competent in some things than many adults. People who are 16 are allowed to drive; 18-year-olds can vote; 21-year-olds have full legal status. A Time magazine

40. ## math

i don't get 2 use the rate 380 miles in 5 hours 2 find the unknown number for each equivelent rate round to the nearset tenth I don't get your question. What "equivalent rates" are you talking about? 380 miles in 5 hours is an average speed of 76 miles per

41. ## English

Could someone please explain to me the rhyming scheme of a Petrarchan poem? http://www.answers.com/topic/petrarchan-sonnet Let us know if you still have questions. =) Here's an excellent explanation of how one figures a rhyme scheme:

42. ## math

how do i change 3.75 into a fraction simple or improper fraction? you could say 3 and 3/4 (since .75 = 3/4) or you could go from there and convert to improper. basically simplify 375/100 (multiply 3.75/1.00 by 100/100) but it can't be 3 and 3/4 your answer

43. ## math,help plz

i am lost with this one. Solve the system by graphing. what is the soltion. 2x-2y=10 x+y=3 x=4 This is how the problem is with all thre equations. Help me please..... put it in slope intercept form. put both lines in slope intercept form. 2x-2y=10 x+y=3 y=

44. ## health

where can i find information on teen driving laws in the metropolitan area [maryland, virginia, district of columbia], and i'm not allowed to use google? Arrrrggggghhhhh. You will have to see at your school if the Drivers Ed teacher has Va, Md, and DC

45. ## math,help

how do i find the following: is there a formula for this? Problem #15 Find the constant term that should be added to make the following expression a perfect square trinomial. x^2+7x square a few binomials and see if you can see a pattern e.g. (x+3)^2 = x^2

46. ## Science

What kind of problems does Rwanda have with its water supply? any chance I could get someone to respond? Since this is not my area of expertise, I searched Google under the key words "Rwanda water supply problem" to get these possible sources:

47. ## Music, Form.

AB form and verse/refrain form are the same, aren't they? Thank you for using the Jiskha Homework Help Forum. Since you are obviously studying music, you may appreciate the following website with a glossary of musical terminology. The AB form is at the

48. ## math,help

okay i am getting confuse with the decimals and fractions in order to make a table for the following problem.can someone help me make the tables the problem reads as follows. solve the system. 5x-3y=13 4x-3y=11 Now, i know i have to break them to the form

49. ## literacy

What is the success criteria for the following genres, - A newspaper report - A balanced argument - A biased argument - An explanation Thank you for using the Jiskha Homework Help Forum. This is indeed an interesting question. The rubric could depend upon

50. ## Health

Is giardiasis transmitted through direct and indirect contact with infected fecal material or by touching the moist lining of the eyes and nose? Isn't it transmitted through direct and indirect contact with infected fecal matter?

51. ## health [slogan]

i need a slogan for teen driving laws for a health project. any ideas? The life you save may be your own! anything else? Be a smart driver and not a smart aleck corpse. Other teachers may have additional ideas. Please keep checking. i was thinking: Strive

This post may be a little lengthy, so please bare with me if you can help. The problem is: A cruise liner has 4 classes of accommodations. Following are the # of reservations made, # of reservations available, and cost per room for each class: Super

53. ## Elem. Ed.

Can someone please give me input on this question? Complete immunization is usually required of chldren: 1.who will be turning 2 years old. 2.before they can travel across state line. 3.at the time they enroll in childcare programs. This question is

54. ## math

Can someone help me with the equation and I will doing the answer During the past few years Great Britian's pund has been worth between \$1 and \$2 in US currency. Suppose the rate of exchange is \$1.50 for each pund. a. What is the value in dollars for 5

55. ## maths

for this quadratic equation: y2-4y-16 = 0 which two options are correct solutions, rounded to three decimal places? 1) -4.483 2) -3.243 3)-2.472 4) -1.472 5) -0.536 6) 5.243 7) 6.472 8) 12.443 Use the quadratic equation, we will be happy to critique your

56. ## Chemistry

Ok i'm supposed to google these values for my teacher, but i can't get the answer im looking for...if you have them can you give them to me? Latice Energy for: Ammonium Nitrate and Calcium Chloride Hydration Energy for: Ammonium ion, Calcium Ion and

57. ## math,correction

i am really trying is this correct. solve: 5(x-2)^2 = 3 MY ANSWER THAT I GOT IS: X = 2 +- (SQRT (3) )/(5) no. 5(x-2)^2 = 3 (x-2)^2 = 3/5 x-2 = +- sqrt (3/5) x= 2 +- sqrt (3/5) so the whole fraction of 3/5 is inside the sqrt yes

58. ## math,correction

Is this correct: Problem #13 Solve: 9x^2 = 14 I did the following i divided 9 by both sides then i get this: x^2 = 1.5555555 then i squared both sides and i got the following answer: x = 1.24 I would not have used decimals x^2 = 14/9 x= +/- (√14)/3 Yes,

59. ## math,help

i am stuck with this problem: Problem #12 Solve by using the quadratic formula. 5x^2 + 5x = 3 i am at this step x = (-5 (+/-) sqrt (85))/(10) you are done!

60. ## Disease Question

Can you help with this question? Giardiasis is a communicable illness that is transmitted: 1. through direct and indirect contact with infected fecal matter or 2. by touching the moist lining of the eyes and nose. I want to say the correct answer is (A)

61. ## i need help,math

okay i am completely lost after reviewing everything my mind is blank cans some one help me with the steps. Solve by completing the square x^2=5x+2 1st: You need to bring the 5x+2 to the other side so you have x^2-5x-2 2nd: Find the values to where when

62. ## English

Has anyone read the book Girl in Hyacinth Blue by Susan Vreeland? If you have I need to draw a picture for each chapter to represent that chapter. Help? I haven't read this book, but drawing a picture for each chapter shouldn't be that difficult if you've

63. ## US History

Should the 1920's be remembered as a time of anxiety & intolerance, hedinism & liberation or both? http://en.wikipedia.org/wiki/1920s =)

64. ## math

can anyone help please, i need a simple formula for working out taxes.if i had any number i need to know what the base was before 16% tax was added. i know the formula if the tax was 17.5%,what ever the total is if you divide that by 47 then x that by 7

65. ## test,math

so then for -4.33333 would be in a fraction -13/3 IF the 333's are repeating. Yes.

66. ## science

what are the 12 examples of liquid items pf matter? gasoline, mineral oil, water, mercury, liquid sodium in a nuclear reactor...and so on.

67. ## science

In what brand of shampoo does a marble move the slowest? It would be in the shampoo that has the greatest density. Since this is not my area of expertise, I searched Google under the key words "shampoo density brand" to get this possible source:

68. ## biology

what is the advantage of stopping mitosis at metaphase when making a chromosome spread?

69. ## vocab

can scuttle have any prefixes or suffixes or can it be changed into a noun, adjective, or adverb? What are some antonyms of it? Please help i am so confused Thank you for using the Jiskha Homework Help Forum again. Don't be too impatient! The volunteer

70. ## Rutgers

Marketing management Customer satisfation and customer value. How are those related? For this and the several other questions you've posted, please tell us your answers and we'll be glad to critique them for you.

71. ## Social Studies

I have to do a project and I can't get motivated to start!! I want a good grade, but I don't know how to convince myself to get started!! PLEASE HELP!!!!!!! Sometimes motivation just doesn't come. You can't wait until you feel like doing it. I urge you to

72. ## pH- really hard one

What is the pH of the solution created by combining 1.00 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? NaOH + HCl ==> NaCl + H2O So all the NaOH is neutralized leaving NaCl, which will not affect the

73. ## maths

for this quadratic equation: y2-4y-16 = 0 which two options are correct solutions, rounded to three decimal places? 1) -4.483 2) -3.243 3)-2.472 4) -1.472 5) -0.536 6) 5.243 7) 6.472 8) 12.443 You have to use the quadratic equation, we will be happy to

74. ## Biology

Can you tell me specifically about the !@#\$%^&tions of all of the squid's body parts and organs?

75. ## Rutgers

Marketing management Customer satisfation and customer value. How are those related? Since this is not my area of expertise, I searched Google under the key words "customer satisfaction value" to get these possible sources:

Problem #1 Solve by completing the square 2x^2-4x-11=0 My answer: x = (2+/-sqrt 26)/(2) Problem #2 Solve by using the quadratic formula x^2-4x-60=0 My answer: x = (2+/-sqrt 16)/(2) You did not do it completeing the square. Please show work. ON the second

77. ## math,help

this is what i have left but i don't know how to finish it. THe length of a rectangle is 1cm more than 4 times its width. if the area of the rectangle is 74cm^2, find the dimensions of the rectangle to the nearest thousandsth. so then: a =Lw A = 74 W= W

78. ## math

Can someone help me with how to write the equatin for these 2 questions. I will figure out the answer. During the past few years Great Britain’s pound has been worth between \$1 and

79. ## math

During the past few years Great Britian's pund has been worth between \$1 and \$2 in US currency. Suppose the rate of exchange is \$1.50 for each pund. a. What is the value in dollars for 5 punds? b. WHat is the value in pounds for \$25.50? 5pounds *(1.5

80. ## Biology-squid-HELP!

What is the buccal mass, and why is the beak inside of it? Buccal mass - Muscular bulb at the beginning of the digestive system that contains the mouth, beaks, radula and various glands.

81. ## crime

indictment and information are 2 ways in which the accused can be informed of a charge.What is a third way? is it presentment?

82. ## English

IN O'connors A good man is hard to find, for the question which person seems excited about having an accident? is the answer Bailey. Thanks These sites may be of help to you. http://www.exampleessays.com/essay_search/A_Good_Man_is_Hard_to_Find.html

83. ## Research Paper

WHat do I do if I have a a source but I don't have the authors name and I have to put it in the paper...?understand.? Many internet sources don't list the author. You can use the URL and title of the site. oh ok thank you...so for example: blah blah

84. ## health >.<

how would you descibe/define teen driving laws Please tell us how you describe/define them and we'll be glad to critique your answer. but i don't know how to ok, here's what i got: Teenage driving laws are rules that have been made to reduce accidents and

85. ## vocab

can scuttle have any prefixes or suffixes or can it be changed into a noun, adjective, or adverb? What are some antonyms of it? Please help i am so confused Thank you for using the Jiskha Homework Help Forum. The definition of the word "scuttle" will

86. ## Rutgers

Marketing Management How do you decide which brand strategy do you take?

87. ## Rutgers

Marketing management the method will use multiple channels of distribution why and why not.

88. ## math correction

Find the x-intercepts y= x^2-2x-15 answer: x = 2 +/- sqrt 8 I don't get that. Recheck.

89. ## AP BIO

Could you give me any information on fruit flies. We did a huge lab on the genetic ratio of wildtype fruit flies to mutant apterous (wingless) flies. Im doing a paper on it and i cant find enough information I don't know what information you have already

90. ## literature

Does anyone know where I can find the last chapter in A Clockwork Orange? Perhaps online? Thanks! Since that book is not out of copywright, you will not find it on line. But this site has a good synopsis of the chapters.

91. ## chem

is it true that ethanol on skin feels cold due to the evaporation of the alcohol yes. But any solvent with a decent vapor pressure will do the same thing. Even water but you may need to wave your hands in the air to help it a little. That's why humans

92. ## Math ,help

how can i simplify this more its for the following problem: Problem #22 solve by using the quadratic formual. 5x^2-4x+1=0 this is where i am but i do not know how to go further. x = (4 (+/-) sqrt (-4))/(10) Problem #23 Solve by completing the square.

93. ## Rutgers

Marketing Mangement How do you determine promotional mix

94. ## math,help

i need help with this one i've tried it many ways and still can't figure it out because it has the lines going between two solid lines. find the x-intercepts. y = x^2 +5x+2 x intercepts is when y is zero. 0=x^2 +5x+2 using formula 5/2 +- 1/2 sqrt (25-8)

95. ## algebra

how would ou write an equation or inequality that could be used for analysis, prediction example gas prices? can some one explain to me how to write this

Braking your car after you observe a child's ball rolling into the street from between parked vehicles is instinctive requires a conscious decision is a reflex is instinctice and requires a conscious decision. (my choice) am I right here? The braking

97. ## math,correction

Is this correct: Solve: (x+5)^2 = 3 I get: x = -5 (+/-) sqrt (3) Problem #2 Solve: 5(x-2)^2 = 3 I get: x = 3 (+/-) ((sqrt(3))/(5) No on the second. YOu have take the sqrt5 slso, so x= 2+- sqrt(3/5) correct on the first.

98. ## French

Is this paragraph correct? Would someone mind editing it for me? La derniere semaine, une partengue a piqué Steve Irwin quand il a nagé à la nord de l'Australie. Steve Irwin est mort de la poison. Il n'y a pas d'un accident. La partengue a été formé

99. ## Rutgers

class marketing management Why incentive compensation is important for sales people? How about commissions?

100. ## english

english which or both are correct: 1. Is their any books by Sam Jones? 2. Are their any books by Sam Jones? ** can is be sigular or plura ( books vs book) Thank you for using the Jiskha Homework Help Forum. The singular = Is there any book by Sam Jones?

101. ## Rutgers

Marketing Mangement Why incentive compensation is important for people? Why is important? In the basic psychology of incentives, the rewards are based on your level of performance. The better your performance, the greater the rewards you will receive. In

102. ## math

i don't understand how i can find the values for n and m int he rate law experimentally