# Questions Asked onFebruary 14, 2007

1. ## Biology

The endosymbiont hypothesis offers an explanation for how eukaryptoc cells could have obtained mitochondria and chloroplasts through a symbiotic relationship with prokaryotic cells that changed over time. What structural feature of prokaryotic cells might

2. ## Grammar

When learning pronoun case (subjective pronoun,objective,possessive) do I need to just memorize the list? I am having trouble identifying them. Any help please. I am in 5th grade. I recommend memorize, using homemade flash cards. It wont take long to

3. ## Math

the distance between any two bases on a baseball diamond is 90 feet.What is the best approximation for the direct distance from home plate to second base? A baseball diamond's four bases form a square with 90 foot sides. A right triangle is formed by home

A steam engine absorbs 1.98*10^5 J and expels 1.49*10^5 J in each cycle. Assume that all of the remaining energy is used to do work. a. What is the engine's efficiency? b. How much work is done in each cycle? If a gasoline engine has an efficiency of 21

5. ## chem

An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen

6. ## word problem

The half life of cesium-137 is 30 years. Suppose we have a 10-g sample. a)Find a function that models the mass remaining after t years. b)How much of the sample will remain after 80 years? c)After how long will only 2 g of the sample remain? Thanks (a)

7. ## Help! Help! Organic Chemistry

Alcohol Dehydration of 4-methyl-2-pentanol (a)based on the mechanism of the reaction, explain why (E) and (Z) 4-methyl-2-pentenes and the 2-methyl-2-pentene are the three major alkene products. (b)Explain why the reaction conditions promote carbocation

8. ## physics.......to bobpursley

Bobpursley: Which of the following systems have high entropy? Which systems have low entropy? a. papers scattered randomly across a desk b. a freshly opened pack of cards c. a cultivated field of cabbages d. a room after a party I sent this to you earlier

9. ## Finance

The Carter Company's bond mature in 10 years have a par value of 1,000 and an annual coupon payment of \$80. The market interest rate for the bond is 9%. What is the price of these bonds The coupon rate on the bond, (interest/principal at maturity) = 8%

10. ## Physics

In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you

a). How many ways can a person select three appetizers and two soups if there are six appetizers and five soups on the dinner menu? b). Three married couples have bought tickets for six seats in a row for a movie. - HOw many ways can they be seated? - How

12. ## Chemistry

From your experience, predict which of the following reactions are spontaneous. a) Zn(s) + 2H+(aq)--> Zn+2(aq) + H2 (g) b) CaCO3(s) + 2H2O(l) --> Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) --> CO2(g) + 2H2O(g) d) Ag+(aq) + Cl-(aq) --> AgCl (s) Our book

13. ## Gauss' Law!!!!!!!!!!

Can any one help me for this problem? The cube in Figure 23-27 has edge length 1.40 m and is oriented as shown in a region of uniform electric field. Find the electric flux through the right face for the following electric fields, given in newtons per

Which of the following systems have high entropy? Which systems have low entropy? a. papers scattered randomly across a desk b. a freshly opened pack of cards c. a cultivated field of cabbages d. a room after a party Whomever designed this question doe not

15. ## physics

a drop of oil vol 0.05 cm3 is released from a medicicne dropper on to a calm surface pond where it spreads out to cover an area of 40 cm 3. Assume oil film is uniform thickness equal to diameter of oil molecule. Calculate the diameter of oil molecule and

16. ## World Studies

Why is it important that Christopher Columbus found America? Due to his discovery of the Americas, it kicked off the age of exploration for the Europeans. Soon this led to the colonization of the north and south Americas. Hope that helped =P Did he

17. ## Chemistry

A solution of a weak acid will consist of the acid and its conjugate base. True or False false Yes, of course: Take acetic acid acetic acid + H2OH3O+ + acetateion- The system is in equilibrium. true

18. ## Check!!!

okay so the question is: A unit circle center at the origin undergoes a series of transformations. The equation of the resulting graph is (x-3)^2+ (y+4)^2= 25 describe the transformation the unit circle underwnt Answer: The original circle was centered at

19. ## Chemistry

Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by

20. ## chemistry

what are some the different types of chemical reactions that occur on a daily basis our lives? wouldnt there be many? eating, taking medications, would emotion be or cause chemical reaction? All of the above. Add breathing. Don't forget the cars we drive,

21. ## computers

why do we need computer ethics? Why should we need ethics at all? The next question is why should computers change that? that doesnt answer me question Actually, it does. Think. Are you clear on the meaning of the word "ethics"?

22. ## HHEELLPP!!!!!!!!!!!!!!!!!

can anyone write a real world situation that can be represented by the given expression n + 7 5n 1/4n 2n- 12 n/10 + 23 mis-identified on subject line like write a situation using these numbers Here is one as an example: The amount of illuminated tracer

23. ## math

How do I change a fraction to a percent? Like 9/15 to a percent for instance. put 9/15 in your calculator and hit equals

24. ## math

how do i do x2+12x+32 x2+12x = 14x+32 subtract 14x from each side 14x=32 divide by 2 7x=16 x=16/7, which is 2 and 2/7 ok maybe you typed that question wrong? is it x^2 + 12x + 32 ? if it is then the solution is: (x+8)(x+4) because when you multiply them

26. ## Decaf Coffee

Is decaf coffee completely decaffinated?? .. or are there low amounts of caffiene in brewed decaf coffee? (i'm researching about people with health conditions concerning caffiene... if they even should be drinking decaf coffee at all!!) - can anyone find

27. ## Chemistry and Balancing

Mr Pursley. i was wondering if you would be kind enough to explain to me the process of balancing equations I undestand some of the rules but I continue, to make simple mistakes. Would you kindly offer some assistance please, via email. To help me get

28. ## biology

List 5 functions of protein in the body. Thanks in advance. Since this is not my area of expertise, I searched Google under the key words "protein functions" to get these possible sources: http://en.wikipedia.org/wiki/Protein (Broken Link Removed)

29. ## Word problem 2

The 1985 Mexico city earthquake had a magnitude of 8.1 on the Richter scale. The 1976 earthquake in Tangshan, China was 1.26 times and intense. What was the magnitude of the Tangshan earthquake. Thanks

30. ## world war II

What were the federal departments that were established to carry out the way World War II was to be fought? http://en.wikipedia.org/wiki/Politics_of_the_United_States_during_World_War_II Check out the Cabinet listing. =) european theater and pacific

31. ## College Math - Word Problem

An artist entered two paintings (Lighthouse and Cathedral) ina show. He feels that the probabilities are 0.15, 0.18 and 0.11, respectively, that he will sell the Lighthouse, Cathedral, or both. What is the probability that he will sell either of the two

32. ## HELP?? Math

A group of children can be classified according to eye color (blue, brown, green), gender (male, female) and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers). How many possible different classifications are

33. ## ALGEBRA 1

Use inductive reasoning to predict the next Number in each sequence. 1.3,7,11,15... i figure this to be 19 because each number following the first is a difference of 4. 2. 1,-2,4,-8 this is abit difficult for me. I am guessing the answer tobe 10. I

34. ## Tale of Two Cities

I have to write a comparsion essay comparing the two cities, London and Paris. What are their differeneces? Please help. What can some of my points be? Please read the opening passage of this novel. What does Dickens say about the differences and

35. ## Geography

If you just land in Australia no sign of civilization wat would you do to make a axe or something sharp to cut wood to make houses and such? This site tells how early people made sharp objects. http://weber.ucsd.edu/~dkjordan/arch/tools.html

At a fair run by a local charity organization, it costs 50 cents to try one's luck in drawing an ace from a deck of 52 playing cards. What is the expected profit per customer if they pay \$4 if and only if a person draws an ace. I presume that the drawn

37. ## Maths

What is surface area and how do you work it out? Surface area is the area on an object. How one works it is dependent on the object. SURFACE IS THE AREA OF ANY OBJECT. AND HOW IT WORKS IS IF YOU HAVE A SQUARE AND YOU WANT TO FIND THE PERIMITIER THEN YOU

38. ## algebra 1

A plane trip scheduled between Tampa and St. Petersburg was scheduled for 22 minutes. The distance is about 17 miles. How fast would the plane be traveling in miles per hour? 22/60=.367 hrs so 17 miles in .367 hr = x miles in one hr 17/.367=x/1 x=46.32 mph

39. ## World Studies

Why was the Civil War important? Why was World WarII important? Please answer my questions! http://en.wikipedia.org/wiki/World_War_I http://en.wikipedia.org/wiki/World_War_II Please note that we are not here to do students' homework for them. Our tutors

40. ## Science

when working with the particle theory, for which changes of state does the volume increase? and Decrease? volume changes greatly when going to the gas state. what part of the system is missing

41. ## Chemistry

What is the pH of a solution with [OH-] = 2.5 x 10-3? I don't even know where to begin with this problem :( You know [OH] + [H+] = 1*10^-14 so solve for [H+], then pH= -log [H+]

42. ## English

I can't figure this question out. Is "And may the muse inspire each future song" a metaphor a heroic couplet a parallelism an allusion That is an allusion. What is a "muse"? What would this person be wishing for? Thanks :) never been great at those types

43. ## Chemistry

Is cutting a tree reversible? Several things come to mind, maybe not the same tree will grow back or not. Pls help. Thanks much. Cutting a large tree DOWN, as in severing the trunk, surely is not reversible. We can't cut the tree down, then glue it back

44. ## ALGEBRA 1

If M angle 1 =3X=10 and M angle2=x=14 and clld, find the value of x. Here is what I DID NOT SURE IF I am on the right path 3x+1o=x+14 3x=x+14-10 2x=4 x=4/2 x=2 Thanks much.

45. ## math

what is 80% of 5? 4 4

46. ## math

Driving down a mountain, torn finds that he has descended 1800 ft in elevation by the time he is 3.25mi horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth. 2,175

47. ## logarithms

5^x=5^-6 Take the log base 5 of each side: log5 5^x=log5 5^-6 x= -6 is your teacher Mrs. Lake?

48. ## computers

what does this mean: what are some of the immediate concerns of computer ethics today?? sorry i am albanian and i do not understand english very well The concern of fraud, and fake sites. The concern of abuse of children The concern of the unrestricted sex

49. ## math

turn this equation: X2 (X to the second power)+16x+15x I'm suppose to use the Distributive Property to factor this expression......HOW?!?!?!? And I also have to show the steps. how?!?!? please help!!

50. ## spanish

Hi, can you help me figure out what this paragraph says. Se ve en la cara que le duele alguna parte de su cuerpo. Tal vez comio demasiados dules y tiene dolor de estomago o le duele la cabeza. Quizas le duele el codo o la mano porque estaba jugando al

51. ## physical science

what do this statement mean light plus light=no light http://www.exo.net/~pauld/summer_institute/summer_day8interference/Interference_laser.html

52. ## science

what happens to the load on a bridge that carries the Goeta Canal when a boat passes slowly through the canal? The Goeta canal in Sweden is not carried by a bridge. There are bridges over it. The loads on the bridges do not depend upon water traffic below.

53. ## History

What were some of the technological and urban transformation effects on the middle class in 19th century Europe? Please see the social effects in this article. http://en.wikipedia.org/wiki/Industrial_Revolution This site addresses your question more

Debate the ethics of doing business in countries with totalitarian governments looking for holes and inconsistencies. Attempt to answer any arguments that are presented against your side of the argument. Please tell us your ideas and we'll be glad to

55. ## Chemistry

When determining the pH of a solution, will the indicator react with and change the properties of the solution. No, not significantly.

56. ## Chemistry

All acid-base indicators change color in the same pH range. All? What is your thinking on this? Surely you do now want us to do your thinking for you

57. ## English

I can't find anything about Puritan Punishment. I am try to figure out what they believed was an effective mean of punishment? I googled it and everything. Does anyone know? http://russell.gresham.k12.or.us/Meling/newcrimeandpunish.html

58. ## intro to Psychology

I am working on some homework where I have to identify the unconditional stimulus, unconditional response, conditional stimulus, and conditional response. I am finding this very diffucult and didn't know if there was any one out there that could help me.

59. ## health

This a research on HIV/AIDS It is believed that in 1959 is the earliest known case of AIDS and the discovery suggest that AIDS virus has a common African ancestor. Later on (1981), men (gay) were getting sick with pneumonia and dying and discovered that

60. ## chemistry

We did this in a lab and nothing happened, but I'm pretty sure something was supposed to happen, so my question is: What happens when you put a pellet of sodiumhydroxide on a watch glass and observe it for 5-10 minutes? If there were hudidity in the air,

61. ## MATH

For the floor plans given in exercise27, determine whether the side through the points (2, 3) and (11, 6) is perpendicular to the side through the points (2, 3) and (-3, 18). Compute the slopes of the two lines. If the product of the slopes is -1, then te

62. ## Calculus

Factor the following: y = (x-a)^5 . (x-c)^5 . (a-c)^5 It looks already factored to me

63. ## atoms

If i was to draw a diagram of a hydrogenatom with one electron and its many spectral lines would i need to draw the BOhr model with the nucleus in the middle and 3 outer rings or have i lost the plot That is one way. Actually, there are an infinite number

64. ## World Studies

What are some events that happend in history and why are they important? (at least a list of 4) http://www.hyperhistory.com/online_n2/History_n2/a.html Wow! Take your pick!! =) Don't forget such tings as the discovery of penicillin, the discovery of AIDS,

65. ## Art Help

I'm writing a paper on Masaccio. So far, I've gotten it to a page and figured out that I need about 3 paragraphs about his art and then my conclusion. The problem is that i'm getting conflicting information. Most places say that only 4-5 of his works have

66. ## Aaron

Is 2041 rounded to the nearest hundred 2000 or 2100? http://www.math.com/school/subject1/lessons/S1U1L3GL.html Read about rounding off whole numbers. Ask yourself this: Is 2041 closer to 2000 or 2100? Same answer.

67. ## math

(s2)3/4 I don't know what you mean. Use ^ to mean an exponent follows. how do you convert mph to miles/meters per second?

68. ## math

how do you write an equivalent addition equation

69. ## Math

How many kilometers are in 153900 mm? do i just divide by 1000? (Broken Link Removed) Looks like it! =) 30lb=_____kg?