Questions Asked on
April 11, 2008

  1. Physics -Interference & Diffraction

    Given Information: Light of wavelength 631 nm passes through a diffraction grating having 485 lines/mm. Part A: What is the total number of bright spots (indicating complete constructive interference) that will occur on a large distant screen? *Answer: 7

    asked by Christina
  2. Physics check

    An excited atom decays to its ground state and emits a green photon. If the atom decayed to an intermediate state instead, the photon emitted could be.... red or blue?

    asked by Molly
  3. Physic

    A person in a dark room looking through a window can clearly see a person outside in the daylight, where as the person outside cannot see the person inside. Explain

    asked by Nita
  4. math - help me plz

    can you solve this equation by using simultaneous equations and can you write the method please? Sarah and Louise have a combined age of 24. Six years ago Sarah was triple Louise's age. What is Sarah and Louise's ages now. Let Sarah be x and Louise be y.

    asked by loooooooser
  5. Physics

    1)When the currents in two parallel metal conductors are in the same direction, the conductors ___ each other. A)attract B)repel C)do not exert any force D)exert forces that are perpendicular to I got A. I couldn't find where it talks about directions of

    asked by Jon
  6. Dancing Skeletons by Katherine Dettwyler

    I am rather curious to find out how the idea of ethnocentrism is displayed in the novel "Dancing Skeletons: Life and Death in West Africa" by Katherine A. Detwyler.

    asked by Susan
  7. Physics check

    The mass of an atomic nucleon (proton or neutron) is about ..... times larger than the mass of an electron. 33?

    asked by Molly
  8. Physics

    A ruler is accurate when the temperature is 25°C. When the temperature drops to -16°C, the ruler shrinks and no longer measures distances accurately. However, the ruler can be made to read correctly if a force of magnitude 1.2 103 N is applied to each

    asked by Johnson
  9. math

    is 2tanx the same as tan2x?

    asked by anon
  10. Physics

    1)The polarity of an electromagnet can be determined using the second right-hand rule. true. 2)Current passing through a conductor is increased from 10 A to 15 A. This decreases the strength of the magnetic field produced by the conductor. false.

    asked by Jon
  11. Physics

    1)A current-carrying conductor is kept at right angles to the direction of a magnetic field. What happens to the force acting on the wire if the strength of the magnetic field doubles? the force is doubled. 2)How much current is required to produce a force

    asked by Jon
  12. Physics check

    In Rutherford's Gold Foil experiment, he bombarded gold with alpha particles and discovered the .... electron?

    asked by Molly
  13. Physics check

    In 1906, J. J. Thomson won the Nobel Prize for the discovery of the ..... electron?

    asked by Molly
  14. Physics check

    In 1923, Robert Millikan won the Nobel Prize for discovering the mass of the .... electron?

    asked by Molly
  15. Physics check

    According to Bohr, an electron in an excited state could give off ..... a continuous cascade of photons for a high-level transition.

    asked by Molly
  16. social studies

    i need help with this one problem on a cross word, i couldn't find it any where in the text book.... (blank)factors; reasons why many immigrants from latin america are moving to the united states which include jobs and education. can you help me

    asked by Lorenzo
  17. Physics check

    The spectral lines for elements are sometimes called atomic..... spectra?

    asked by Molly
  18. Physics check

    Heavier atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more.... nuclear energy?

    asked by Molly
  19. Physics

    Supppose an atom has four distinct energy states. Assuming all transitions are possible, how many spectral lines can this atom produce? Answer with a number only.... ? have no idea

    asked by Molly
  20. Chemistry

    The initial concentration for the compounds involved in the reaction shown were determine to be [CO]=1.80, [CL2]=9.70; [Cl2CO]=0. Calculate the value of the equilibrium constant (Kc) at 527C, if the equilibrium concentration of CO was 1.05E-3. CO(g) +

    asked by Help ASAP!!
  21. Help me SraMcJGin(i thinks that's it.

    How do you say Formula One Grand Prix I really need to know. Thanx!

    asked by I like pie
  22. science(chem)

    My lab teacher told me to leave my sample mixture of 2-bromobutane and 2-chlorobutane in a solution 1-2ml of sodium bicarbonate. Then I asked after I had wrapped it up, whether there would be a reaction if I left it there for a whole week since that's what

    asked by ~christina~
  23. Kate Chopin Coursework

    Kate Chopin’s stories are essentially about the struggle of freedom Kate Chopin was one of the most individual and adventurous nineteenth century American writers. Throughout Kate Chopin’s stories, she gave the readers a woman’s view

    asked by Baby
  24. economics

    The domestic economy's consumption possibilities curve can be greater than the domestic economy's production possibilities curve. Why is this true?

    asked by Molly
  25. Physics

    A 0.21 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 18 N. -------------------------------------------------------------------------------- (a) How does the magnitude

    asked by Johnson
  26. math

    Henry has $240 more than my cousin Joe, who has $150 more than my friend Ann. Together the three people have $990. The amount Ann has, in dollars, is: a. $150 b. $200 c. $390 d. 450 e. $600

    asked by sridhar
  27. math

    I need help with 4 mat problems. I do not know how to set up to solve. x/8=-6 -4/9+(-5/7) x-4/5=6/7 7/x=?/xsquared

    asked by will
  28. year 7 history

    please could someone help me . i need to write a front page newspaper article about queen mary 1 i need to include pictures and information . i`m having trouble finding pictures. thanks to all that help.

    asked by hannah
  29. Algebra/Geometry

    I am eating a snow cone in a paper cone with a height of 21cm and the radius of my snow cone ice is 3.25 cm. Find the amount of material needed to make my paper snow cone

    asked by Angelita Marie
  30. English/Spanish

    Can someone translate this to English, please? el dia 5 de febrero compre un reloj nuevo de la marca seiko en ebay del vendedor xxx y lo pague usando paypal el total fue de 148 dolares (120 dolares por el reloj mas 28 dolares por shipping y handling), el

    asked by Tadeo
  31. Critical thinking

    Why and how could you apply critical thinking when evaluating each of the following: articles, advertising, media and conversations?

    asked by Caroline kutzler
  32. Math

    Can someone explain how to write 7/16 as a percent?

    asked by Anonymous
  33. English

    Steroids in the world of Athletes In the last decade many records have been broken in the world of athletics, is this do to harder training and work ethic or the ignorant testing of anabolic steroids. With technological advances the enhancement of athletes

    asked by Walker
  34. science

    what are environmental benefits and challenges of urbanization?

    asked by brady
  35. geography

    what is the name of desert name at west side of south america. and at northern side of africa

    asked by Thabelo
  36. Legal

    Can you tell me where I can find out this information? I'm stumped on my homework on this one. When suing for damages, a plaintiff can request recovery of A: Double the worth of the original goods B: The amout of damage alleged C: The defendant's property

    asked by Justie
  37. Legal

    Also, can you tell me where to find information on General Appearance. This is my question I need to find the information on. If a party makes a general appearance in court before filing a plea, she is, in effect, _____ Thank you again!

    asked by Justie
  38. sign language

    Is American Sign Language used worldwide? Or is there a different kind of sign language for different countries?

    asked by sarah
  39. Precalc

    A boat that travels at 16 knots in calm water is sailing across a current of 3 knots on a river 250 m wide. The boat makes an angle of 35 degrees with the current heading into the current. Find the resultant velocity of the boat. How far upstream is the

    asked by Natalie
  40. Chemistry

    I need help the question is Convert 25 x 10 to the 25th molecules of CO2 to grams of CO2. I know that one molecule of CO2 is 44.01 g but the answers are .106g,9.44g,1.8x10^4 g, and 2.5 x 10^4 g I don't get it can anyone help me!

    asked by Tiffani
  41. biology / CELEISTINE

    describe the genetics of the huntigton disease a. what chromosomes are affected? b. is it a result on translocation/ c. is it a sex-linked? d. does it skip a generation 3. waht are the cause of huntington disaese? how does it occur ? is it preventable ?

    asked by natacha? HUNTINGTON DISEASE
  42. college algebra

    Let f(x) = 1/x Evaluate and plot g(x)= -f(2x) + 1 Start with the innermost transformation and work outward in steps. There are 3 transformations

    asked by Sarah
  43. Religion

    In the Symposium how do most people go about trying to gain inmortality according to Diotima and what about those pregnant in soul?

    asked by Wanetta
  44. Physics

    1)The direction of the force on doubly ionized helium atoms(alpha particles)moving at right angles to a magnetic field is opposite to the direction of the force given by the third right-hand rule. true. 2)The electromotive force is a force that makes

    asked by Jon
  45. Physics

    1)An increase in the velocity of wire moving perpendicular through a magnetic field increases the induced EMF. true. confused me 2)There are four coils of wire being used as electromagnets. They all have the same size and are made up of the same material

    asked by Jon
  46. biology

    true or false-Homozygotes for the BRCA1 allele will definitely get breast cancer.

    asked by naomi
  47. Physics

    1)A 0.050 m long wire is carrying a current of 2.0 A at right angles to a 0.15 T magnetic field. What is the magnitude of the force exerted by the magnetic field on the wire? F=ILB (0.050)(2.0)(0.15) 0.015 N 2)Which device is used to measure very small

    asked by Jon
  48. Physics

    1)When does a magnetic field induce maximum EMF in a wire moving with a constant velocity? when the wire is moved at right angles to the magnetic field. 2)Which rule is used to find the direction of force produced by electromagnetic induction? fourth

    asked by Jon
  49. Physics

    1)An electromagnetic wave has a wavelength of 6.2 x 10^14 n. What is the frequency of the wave? 3.00 x 10^8 * 6.2 x 10^14 1.8 x 10^24 = frequency 2)The velocity of an electromagnetic wave depends on: its wavelength and frequency

    asked by Jon
  50. Physics

    1)An electromagnetic wave is produced by: an accelerating charged particle or changing magnetic fields. 2)Find the period of an electromagnetic wave of wavelength 2.20 x 10^-2 m. 3.00 x 10^8 * 2.20 x 10^-2 = 6.60 x 10^6 s

    asked by Jon
  51. algebra 2

    Find the set of all integers, n, for which the fraction 20/(10-n*n) is an integer I used n*n for n squared I figured that 10-n*n must be a factor of 20 and the only answer that ended up working was +-3, is this right?

    asked by Terri
  52. Physics

    1)Which of the following statements about X rays is incorrect? A)x rays darken photographic plates B)x rays can penetrate soft body tissue C)the kinetic energy of high speed electrons is converted to x rays when they collide with matter. D)x rays can

    asked by Jon
  53. Troy

    Can someone check my answers for the following problems. Simplify. Assume that no denominator equals 0. 1)(7x^2+3x-9)-(-x^2+8x-3) answer: 6x^2-5x-6 2) 5x^3(7x)^2 answer: 245x^5 3) (2x-3)^2 answer: 4x^2-9 4) Use synthetic division to find

    asked by Alegebra2
  54. Annuities and sicking funds

    Jane forest wants to receive yearly payments of 15000.00 for 10 years. How much must she deposit at her bank today at 11% intrest compouned annually? I have fugured it to be as follows and could someone tell me if i am right. 15000.00 Future Value N

    asked by Scott Ingraham
  55. Media and Culture

    Discuss the similarities and difference between cable communication and traditional television broadcasting. and include the future role of broadcast TV in the face of growing cable and dir3ect broadcast satellite use.

    asked by Jean
  56. English

    Summarize Paris' request of Capulet, and Capulet's response?

    asked by ROBERT
  57. Chem Help!

    I need help answering this question? Weather balloons are only partially inflated before they are released into the atmosphere. Why is that?

    asked by Lisa
  58. science

    Essay Impacts of West Indian Manatee& Jamaican: on the Caribbean's economy

    asked by mich
  59. disease

    is trisomy x sex-linked

    asked by Anonymous
  60. social studies

    what website can i go on for egypt

    asked by 2548
  61. chemistry

    Lab: Creating a Redox Table Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will see how more extensive tables of relative strengths of oxidizing and

    asked by Joseph
  62. science

    can someone please help me with this question. Give me an example of a jellyfish and a eagle body plan or internal structures. Then explain what is a body plans and internal structures for animal.

    asked by Dj
  63. usage

    anything to distnguish differences between affect and effecta while and a while,sometime and some time and all the other words simular, in usage. Thank you

    asked by Dana
  64. Science

    what are ten characteristics that make up living organisms/

    asked by xoliswa
  65. algebra1

    Colin invested $32,000, part at 8% and part at 12%. If the total interest at the end of the year is $3,160, how much did he invest at each rate?

    asked by deshaun
  66. Physics / Dynamics

    After the fuel is turned off, the rotor of a jet engine decelerates under the action of air friction, which depends on the square of its speed, and constant bearing friction. Thus the deceleration is written as b + c * w^2, where b and c are constants and

    asked by Kyle
  67. English - Connected Texts

    Can anyone suggest two films that I could use to compare and contrast? Because I have to choose two for my English task, and the films have to a decent amount of smiliarites. My problem is that there are too many movies out there to choose from and I'm not

    asked by TP
  68. Critique ?

    I was wondering if you guys critique papers? I have noticed that Jishka does check problems or answers to questions, but what about research or term papers? How do I get the paper to you, given that you will critique the paper?

    asked by Marinda
  69. genral ability

    A truck became wedged under a low bridge.It could not move backward or forward without severely damaging its roof.The truck driver was perplexed until a little girl watching nearby an easy solution.What was it?

    asked by Siu
  70. English

    Hi, can someone please proofread and check my grammar. I'll appreciate it. Thanks! 3) what were the main points of the article? Provide concise summary. The author of the article defines resilience as the individual’s capacity to develop resilience in

    asked by Bizzy
  71. Algebra

    Why is the line x=4 a vertical line?

    asked by Patricia