# Questions Asked onMarch 29, 2007

1. ## math (vectors) & physics

Posted by sam on Wednesday, March 28, 2007 at 7:32pm. In unit-vector notation, what is the net torque about the origin on a flea located at coordinates (-2.0, 4.0 m, -1.0 m) when forces F1 = (-4.0 N) k and F2 = (-5.0 N) j act on the flea?

2. ## physics multiplying vectors

In the product F = qv · B , take q = 4, = 2.0i + 4.0j + 6.0k and = 136i -176j + 72k. What then is in unit-vector notation if Bx = By? ~~may i get some assistance in this problem? so far.. i tried this.. 136i-176j+72k = 4(2.0i+4.0j+6.0k)(B) 136i-176j+72k =

3. ## chem

confused about this one. 2 samples of water of equal volume are put into dishes and kept at room temp for several days. the water in the first dish is completely vaporized after 2.8 days while the water in the second dish takes 8.3 days to completely

4. ## Physics

A spring (k = 857 N/m) is hanging from the ceiling of an elevator, and a 5.9 kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.81 m/s2? force=

5. ## physic

1. A surface charge can be produced on insulators by a. grounding b. induction c. polarization d. contact 2. Unlike insulators, conductors can be charged by a. grouding b. induction c. polarization d. contact The easy way to charge an insulator is by

6. ## Physical Science

From a general relativistic point of view, a person on the ground floor of a skyscraper ages...faster or slower than a person on the top floor? With the faster movement of the rotation of the earth at the higher altitude, the person on the ground floor

7. ## science

what should you ask yourself when looking for an independent variable in an experiment? I would ask whether that variable can be manipulated or not. Here is more info on experimental variables that might be helpful. An independent variable is the potential

8. ## chemistry... confusing!

a scuba diver breathing normal air descend to 100 m of depth, where the toal pressure is 11 atm. What is the partial pressure of oxygen that the diver experiences at this depth? I know that at 100m that a diver would have to breathe Heliox, meaning that

9. ## algebra

Can someone please tell me if I did this problem right? A new truck that sells for \$29,000 depreciates 12% each year. Write a function that models the value of the truck. Find the value of the truck after 7 years. my answer=p(x)=price of truck (\$)

10. ## Math - Statistics

I roll 12 4-sided dice. What is the probability that I roll at least one 2? What is the probability that I roll exactly three 2s? So i take it, on any give roll, the probability of rolling a 2 is .25 (25%); the probability of rolling something else must be

11. ## algebra1

M varies directly with n; m=144 when n=8. What is the constant of variation k? I don't know what this mean. Could you help me out in solving this/ A statement such as "M varies directly with n" can be changed to the equation M=kn, where k is a constant.

12. ## socialstudies

what is ten things that colonists would have had to do within a short time after arriving in america They'd have to build shelters (houses) and find food. What else do you think they'd have to do?

13. ## math

What is the square root of 121? show work thanx I memorized this long ago in the fourth grade as 11. If you want to show work, show that 11x11 is 121. 11x11=121

14. ## Chem

From the information below, identify element X. a. The wavelength of the radio waves sent by an FM station broadcasting at 97.1 MHz is 30.0 million (3.00 X lo7) times greater than the wavelength corresponding to the energy difference between a particular

Find the interior and exterior angle measurements of a polygon with this many sides: x=2y help? I don't want the answer, I just would like to know how to do this one. I don't see why a number of sides is being specified as an equation. The SUM of the

16. ## Chemistry

Consider a solution containing 0.100M fluroide ions and 0.126M hydrogen fluroide. Calculate the concentration of fluoride ions after the addition of 5.00ml of 0.100M HCl to 25.0ml of this solution. a description as to how to get to the answer would be

17. ## physics

A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 95 kg. A person pushes on the outer edge of one pane with a force of F = 80 N that is directed perpendicular to the pane. Determine the magnitude

18. ## Physics

When the rubber band in a slingshot is stretched, it obeys Hooke's law. Suppose that the "spring constant" for the rubber band is k = 53 N/m. When the rubber band is pulled back with a force of 7.3 N, how far does it stretch? F=kx solve for x.

19. ## physics multiplying vectors

n the product F = qv · B , take q = 4, = 2.0i + 4.0j + 6.0k and = 136i -176j + 72k. What then is in unit-vector notation if Bx = By? ~~may i get some assistance in this problem? so far.. i tried this.. 136i-176j+72k = 4(2.0i+4.0j+6.0k)(B) 136i-176j+72k =

20. ## Physical Science

Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that they have been in a different....? health plan :-) spcae times

21. ## Math

Each letter in the subtraction problem below represents a different digit from 0 through 9. The digits 3 and 5 do not appear in the problem. Replace each letter so that the answer to the subtraction problem is correct. GRAPE - PLUM ________ APPLE Why would

22. ## Calculus

Consider the following problem: A farmer with 810 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total are of the four pens? your drawing

23. ## Physics

If a solid glass cylinder is placed above the words Lead Oxide (Lead in red print and Oxide in blue) and viewed from the side, the word Lead appears inverted, but the word Oxide does not. Explain. What part of the cylinder is on top of the letters? From

24. ## war

What modern vehicle was invented to circumvent trench warfare? That is easy it would be tanks.

25. ## Science

For each reaction in a lab I have to write: 1. the balanced molecular equation including states of matter 2. the balanced complete ionic equation, crossing out spectator ions, including states of matter 3. the balanced net ionic equation, including states

26. ## Physical Science

In which of these processes is an element of matter changes into a completely different element.....nuclear fusion, nuclear fission, neither, or both? Please note that we don't do students' homework for them. Once YOU have attempted to come up with a

The cost of producing a number of items x is given by C=mx+b, inwhich b is the fixed cost and m is the variable cost (the cost of producing one more item). (a) If the fixed cost is \$40 and the variable cost is \$10, write the cost equation. Could someone

28. ## Algebra II

State the vertex of the graph: y=2x-6x+9 ...the 2x is squared. y = 2x^2 -6x + 9 The vertex is where the function is a minimum. That would be where dy/dx = 4x -6 = 0 x= 3/2 If you are not familiar with calculus, then rewrite the expression y = 2 (x^2 -3x +

29. ## critical thinking

Where would I find newspaper editorial that are fallacies. Where would be a good place to look for opinion magazine. On the Editorial Page of any newpaper you will find articles and letters that will contain fallacies. In addition, any opinion piece in

30. ## Customs in English Conversation

Hello, First of all, I thank you for helping me to better understand my vocabulary last night. I looked at the definitions that you gave me, Writeteach, and after talking about them with one of my American friends I am confident now that I understand all

31. ## Chemistry

Is this the correct structure for cis-3-octene? CH3-CH2 CH2-CH2-CH2-CH3 \ / C=C / \ H H I can't tell what you have since we can't do spacing on the computer. But I think I can draw it like this: CH3-CH2-C=C-CH2CH2CH2CH3 Now stick a H atom to the #3 and one

32. ## Science

How does an electrical current in a circuit produce thermal, sound, and magnetic energy? The electrical current flows through devices that convert the electrical energy to mechanical or electomagnetic waves. i have a science project do tommorrow but i need

33. ## Physical Science

A gram of radioactive material has a half-life of one year. After four years how much radioactive material will be left...0g, 1/2g, or 1/4g? None of the above. The answer one-half to the fourth power.

34. ## algebra

Find the two consecutive odd integers such that 5 times the first integer is 12 more than 3 times the second. can some explain to me how to get this i was thinking the formula would be ' 5x+12=3x No, that's not it. The second integer is x+2, since it is

35. ## Calc

A rectangular storage container with an open top is to have a volume of 15m^3. The length of the base is twice the width of the base. Material for the base costs \$6 per square meter. Material for the sides costs \$7 per square meter. Find the cost of the

36. ## Physics

To measure the static friction coefficient between a 1.9 kg block and a vertical wall. A spring (spring constant = 458 N/m) is attached to the block. Someone pushes on the end of the spring in a direction perpendicular to the wall until the block does not

37. ## L.A confused Major help

What connects the words sitcom, smog, brunch, muppet and cyborg? These are all combinations of two words. For instance, smog is made up of SMoke and fOG. You can check a dictionary to find the words that make up the others.

38. ## Germany and China

i need to know what kind of children's traffic safety education programs for pedestrians;bicycle or car safety they have in Germany as well as China Thank you using this sentence: i need to know what kind of children's traffic safety education programs for

39. ## math

Solve each formula for n. 2n = 4xp-6 3m-n=4s r/n+2=p t=100(n+3) pv/nR=T 8a+2=6b In the first example, divide both sides of the equation by 2 In the second example, add n to both sides of the equation. Try these yourself. They aren't that hard. We will be

40. ## social studies

Any good web sites that tell about Hellen Kellers child hood. Please help Please No wikapedia google it btw, are you also mark and amy? all 3 of you spelled social studies wrong Thank you for using the Jiskha Homework Help Forum. Here are some excellent

41. ## Food and Nutrition

How can food spices be either an obstacle or an aid to blending into a new culutre? If you prefer to eat highly spiced or seasoned foods, you might not want to eat the foods that are popular in your new culture. I knew a Vietnamese man who lived in the

42. ## Math

How do you find the perimeter on a on a what????? what is "integer" in math terms for example 15 steps behind directions say "write an integer to represent each situation"

The fixed cost for a firm drop by 25%. Prior to this breakthrough fixed cost were \$100,000 and unit contribution maegin was and remains at 5.00. The new amount of break-even units will be: Thank You Very Much! ps: I got two answer Some information appears

44. ## chemistry

I am totally lost on this one. 1,2,2-trimethylcyclopentane I think I have to draw the cyclopentane shape with the single bond going straight CH3 and I am lost from there. Draw the cyclopentane as a 5-cornered box. C-C |  | C  C  \  /

45. ## Physics

A weight lifter returned from the grocery store and unpacked his purchases, fitting everything into the refrigerator door. If the dimensions of the door are 2 meters * 0.57 meters, and he applies a force of 77 N at an angle of 120 degrees with respect to

47. ## Accounting

what is accountability and what is its relationship to a) accounting b) an organisation's responsibilities? thx

48. ## Physical Science

According to the special theory of relativity, all laws of nature are the same in reference frames that....?

49. ## Social Studies

What 20th-century conflict was dubbed the "forgotten war" despite 54,246 U.S. deaths? That would be Korea... this is an excellent site: (Broken Link Removed) It shou be the The Korean War. You might want to double check.

50. ## Finance

You purchase XYZ company's perpetual preferred stock, which pays a perpetual annual dividend of \$8 per share. If the appropriate discount rate for this investment is 14%, what is the price of one share of stock? Thank You! 8/.14 = 57.14

51. ## History

Why was slavery a paradox? I don't understand the word 'paradox' very well, even though I looked it up and it is defined as "a self-contradiction". Please help, I think the answer might have something to do with a quote I found: "Democratic liberty exists

52. ## Physical Science

Objects accelerated to relativistic speeds....live shorter or grow bigger? Please note that we don't do students' homework for them. Once YOU have attempted to come up with a response to YOUR questions, please re-post and let us know what you think. Then

53. ## Physical Science

In a one-g gravitational field, in one second, a light beam will curve beneath a perfectly straight line by.....Less than 4.9 m, 4.9m, or more than 4.9m?

54. ## Chemistry

Use the following information to identify element A and come pound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a

55. ## Physics

By how much does the H20 pressure exceed atmospheric pressure at 3 meters below the surface of a pool with fresh H20. I don't know what equation to use. You have to figure the weight of a column of water of some height h, and horizontal area A. Weight= mg=

56. ## math

I need help finding the missing length of a triangle. We need help to help you. Please repost with the missing data for the problem. Thanks for asking. I hope this helps.

57. ## algebra

A cylinder has a radius of 5 in. if the volume of the cylinder is 250pi in ^3 what is the height of the cylinder V=pi r^2 h 250=pi*5^2*h 250=5pi*h 250=5hpi 250/5pi=5hpi/5pi h=50/pi h = V/Area = 250 pi/(pi*5^2)= 10

58. ## grammar

Is there a dangling modifier in this sentence? Flying over the oak tree, the farmer saw the flock of birds that had damaged his crops. How did the farmer fly? Contential airlines? or American Airlines? gotcha!

59. ## grammar

IN this sentence, I am trying to identify all the parts of speech. "As for me, I don't care for it." As for me- prep phrase I- pronoun subject don't care for it- verb/predicate phrase? or is "for it" something else? thanks, Pegg "As" is serving as a

60. ## MATH

Adding and Subtracting Rational Expressions there are two problems I get stuck with towards the end. 1) 5n/3 + 4n/3 5n+4n/3 9n/3 now i get stuck, i think that I must factor it more but i am unsure, my teacher said I incorrectly distribute the signs? 2)

61. ## math,help

can someone help me plz...last problem simplify (7 + radical (5))(7- radical (5)) for this one i have no idea (a+b)*(a-b)= a^2 - b^2 memorize that, it is the factors of the difference of squares. In this case, a=7, b= sqrt5 so, it simplifies to 49-5=44 So

62. ## social studies

how can we end surrogation? I didn't know that anyone wanted to end surrogation. It's the substitution of one person for another and is very useful sometimes. Do you mean segregation? Are you refering to racial, sexual, age or others types of

63. ## Easy Chemistry

How many valence electrons does molybdenum have? it depends, it can either have valence electrons of 6,5,4,3,2.

In the product F = qv · B , take q = 4, v = 2.0i + 4.0j + 6.0k and F= 136i -176j + 72k. What then is in unit-vector notation if Bx = By? I still can't get the right answer though... I am stuck here: 136i-176j+72k=(8i+16j+24k)x(Bxi+Byj+bzk) How do I solve

65. ## Physical Science

To outside observers, the overall sizes of objects traveling at relativistic speeds are..... larger or smaller or same size?

66. ## Physical Science

Important support for General Relativity came from studies of the precession of the orbit of....what planet? It wasn't precession, it was rotation of the major axis direction of the elliptical orbit, also called "perihelion shift". The planet was Mercury.

I am stumped about the order of the steps to follow on the right side of a 2-step math equation that I have for homework tonight: 2(6d+3)=18-3(16-3d) Do I multiply -3 times 16 and -3 times -3d or do I isolate the minus/negative sign and multiply 3 times 16

68. ## Math

I have a problem..... -4(2x-3)=-8x+5 I understand first you distribute the -4 so you would have -8x+12=-8x+5 Then if you try and move x over to either side you completley get rid of x.... am I missing something or is this problem not solvable? Thank you I

The revenue for a sanwich shop is directly proportional to its advertising budget. When the owner spent \$2000 a month on advertising,the revenue was \$120,000. If the revenue is now \$180,000, how much is the owner spending on advertising? Please Help!! Set

70. ## math,correction

Can someone help me with these...plz Simplify 2radical (12) + 4 radical (27) if i simplify radical (12) i get 2radical (3) then if i simplify radical (27) i get 3radical (3). so now i don't know if i'm doing this correctly or how to set it up... 2 sqrt 12

71. ## Physical Science

According to the well known equation, energy equals mass times the speed of light squared..... ? You question is unclear. Please repost with more specifics.

72. ## algebra

If a is not = to b then the order pair (a,b) is always equal to the ordered pair of (b,a) i am thonking it will never be equal am i correct Never. Order is important, defining unique values.

73. ## social studies

what are disadvantages of this governmnet system: hybrid (with third parties). I know the advantages but what abould the disadvantages? fdgdfg fdgdfg jhgjghj

74. ## math

explain how to read the decimal8.79. the one to the right is the tenths and then the hundreths yes

I roll twelve 4-sided dice. What is the probability that I roll at least one 2? What is the probability that I roll exactly three 2s? i don't knowm sorry the same question was answered by Economist at 4:59

76. ## la

wat is a hyperbole Hyperbole is exaggeration or overstatement. Example: I have told you a million times. They are so tiny you could put a million on the head of a pin. http://volweb.utk.edu/school/bedford/harrisms/hyperbole.htm

77. ## dogs

Does any good web sites to look up a dog called a Basenjis? Great site: http://www.canismajor.com/dog/basenji.html ca9ns look up basenji dot org

78. ## algebra

find the lenngth of each side of the rectangle so that it has the given perimeter. p= 50 in length is 2L-5 width is L is my formaula i am needing to do this 50=2L-5+2*L i am looking at the formula of P=2L+2W do i have this written right should have been 50

79. ## chemistry question check

consider the following chemical reaction: 2 H20 ---> 2H2 + O2 How many moles of H20 are required to form 1.8 L of O2 at a temperature of 315 K and a pressure of 0.957 atm? I got 0.066 moles. Correct? Nope. Do you have some reasoning that you followed you

80. ## health

explain why eating foods that provide all six types of important nutrients at this stage in your life can make you healthy when you are an adult Thank you for using the Jiskha Homework Help Forum. Unfortunately you do not clarify "this stage in your life."

81. ## Math

If Tim can swim 50 meters in 60 sec. But he slows down 12 sec the remaining race. How long does it take Tim to swim a 400 meter race. I'm not quite sure what you are asking, but I will do my best to answer you. I am assuming that "slows down 12 sec the

82. ## Chemistry

Using the following information, identify the strong electrolyte whose general formula is Mx(A)y * zH2O Ignore the effect of interionic attractions in the solution. a. A"-is a common oxyanion. When 30.0 mg of the anhydrous sodium salt containing this

83. ## Physics

A racecar driver speeds around a circular track of radius 100 m at a velocity of 50 km/hr. The coefficient of friction us between his tires and the road is 0.20. It begins to rain, reducing us to 0.15. What must he change his velocity to in order to

84. ## physics

What would be the final temp when 100 kg of 0 degrees Celcius cold water is mixed with 60 kg of 35 degrees warm water? Ans is in degrees Celcius. The sum of the heats gained is zero (remember one will lose heat, so have a negative heat gained). Heatgained

85. ## math,correction

Can somoene helpme plz... Simplify radical 7 * radical 14 wouldn't it be radical (7*14) = radical (98) = 7radical (14) = 7 radical (2) The result is right, you erred on the next to last line. So how do i show that step that i am wrong in...

86. ## Japan help

I need to know the top desceases there are in Japan. Thanks Please clarify your question. Do you mean the most prevalent diseases? or the rate of mortality (deceased people)? ??

87. ## Chemistry

What would be concept in which you would have to use electron configurations in order to solve? and how would you determine the answer? One uses the electron configuration to solve the bonding preferences and energies.

88. ## Physical Science

The stretching out of time due to motion is called time.....?

89. ## legal studies

how in practice the operation of local court differs from that of others??? I have a judge here in our local district court who drives me mad with his innane dress code for men. I think he has a fixation on ancient times. I wonder sometimes if he would

90. ## physics

If a wave travels toward a barrier where the end is not fixed and reflects describe in either words or a drawing what the reflected wave will look like. You can see in an animation what happens at:

91. ## Safety

I need to know what are the top five causes of traffic deaths for Germany and China

92. ## Safety

I need to know what are the top five causes of traffic deaths for any two countries Thank you for using the Jiskha Homework Help Forum. The following site has some interesting graphs:

93. ## science and sports

How is newton's laws related to Volleyball? How is friction realted to volleyball?? http://www.mrfizzix.com/volleyball/

94. ## Early Childhood Ed.

I need help with this question: Classroom activities and situations are most playful when: A. task oriented activities are introduced. B. teachers introduce group games. C. children assign and adopt roles as they interact. D. teachers guide children and

95. ## Algebra

The stove in the kitchen must be kept at 350 degrees F. to bake a cake. the cake is suppose to be complete in 25 minutes. But it is taking longer because the stove is 50 degrees lower(300) away from what it is suppose to be. So how long will it tale for

96. ## math

Solve using the algebraic method. x+5=15 SHOW WORK thanx subtract five from each side. Do you have an allergy to showing work?

97. ## Physical Science

A woman standing on the ground sees a rocket ship move past her at 98% of the speed of light. Compared to when the rocket is at rest, the woman measures the rocket's length as..... longer or shorter?

98. ## Physical Science

The atom number of an element is the same as its.....protons, neutrons, or nucleons? same at the protons, same as the electrons Since this is not my area of expertise, I searched Google under the key words "atomic number" to get these possible sources:

99. ## Information MGT

Name one emerging technology that is helping create new business opportunities and/or helping enhance or better already existing business environments. After studying computers, then switching fields, I find it hard to answer this question since technology

100. ## Algebra (worksheet due tomorrow)

I cannot figure out what the answer to this problem is. Can somebody help plz? any help is greatly appreciated! Tony swims 100 m downstream in 175 seconds. It takes him 400 seconds to swim back upstream. 5. Find Tony's rate with the current. I got r+c=175,

101. ## geomentry

finding the angles of triangles What triangles?

102. ## Safety

I need to know what are the top five causes of traffic deaths for Germany and China

103. ## economics

can someone give me an example of an industry that has positive and negative externality affected on the economy Lawyers. Pharmacecutial companies. Fast Food Industries (consider the long term health car costs of eating that stuff) Tobacco Gambling in

What are the different types of a gene? and What is a solidified remains of an organism? http://en.wikipedia.org/wiki/Allele

105. ## grammar

Is the predication correct in this sentence, it seems right to me. The driving exam is when one is tested on the rules of the road. Thank you for using the Jiskha Homework Help Forum. Grammatically it is o.k. The adverb clause when one is tested on the

106. ## Math

I have a problem that states to simplify. The equation is d=sqrt(x^2+(4-x^2-2)^2) The book tells me that the answer simplifies to sqrt(x^4-3x^2+4). Can you please help me understand where the -3x^2 came from? Thanks! d=√(x^2 + (4 - x^2 - 2)^2) =√(x^2 +

107. ## Physical Science

In the fission equation, the resulting two new elements are called.....? Since this is not my area of expertise, I searched Google under the key words "fission new elements" to get these possible sources: http://www.lbl.gov/abc/wallchart/chapters/08/0.html

3.

109. ## Physical Science

The advantages of the fusion process (although not fully developed) are expected to be.....less radioactive waste and readily available fuel supply? true or false? Less radioactive waste than...? Do you mean readily available energy supply? Since this is

110. ## Literature

I know this is a homework board, but I really was wondering if anyone could help me with a book I'm reading... it's a classic [The Picture of Dorian Gray], so I thought I'd give it a shot. Could anyone explain to me what Lord Henry and the Duchess of

111. ## math

It could be different. One is supposed to define symbols before one starts with a Let statement, as in Let B= a constant Let b= some other constant or let b=B I suspect it is a sloppy typographical error, so B+b= 2B or =2b in math is there a differenc in B

112. ## looking up a state

I would like to look at bugs in Iowa and see the type of houses they live in also I would like to see how they live in that type of weather there. http://www.extension.iastate.edu/Publications/IAN606.pdf

113. ## Creative Expression and Play Question

Cognitive development is fostered by play when: 1. children practice their vocabulary. 2. children plan and solve problems. 3. teachers supervise play. 4. children do arts and crafts. Isn't cognitive development fostered when children plan and solve

114. ## geomentry

how solve right triangles Using the pythagorean theorem a^2+b^2=c^2 helps if you're looking for a side.

115. ## grammar prep.phrase

"Beneath the window was a garden of flowers" Is "of flowers" a prepositional phrase? flowers being the object of prep.? thanks, Pegg You're right on both counts! Congrats!! =) hhh