# Questions Asked onApril 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

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?

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

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.

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

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.

7. ## Physics check

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

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

9. ## math

is 2tanx the same as tan2x?

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.

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

12. ## Physics check

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

13. ## Physics check

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

14. ## Physics check

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

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.

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

17. ## Physics check

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

18. ## Physics check

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

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

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) +

21. ## Help me SraMcJGin(i thinks that's it.

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

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

23. ## Kate Chopin Coursework

Kate Chopinâ€™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 Chopinâ€™s stories, she gave the readers a womanâ€™s view

24. ## economics

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

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

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

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

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.

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

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

31. ## Critical thinking

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

32. ## Math

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

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

34. ## science

what are environmental benefits and challenges of urbanization?

35. ## geography

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

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

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!

38. ## sign language

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

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

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!

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 ?

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

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?

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

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

46. ## biology

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

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

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

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

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

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?

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

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

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

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.

56. ## English

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

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?

58. ## science

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

60. ## social studies

what website can i go on for egypt

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

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.

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

64. ## Science

what are ten characteristics that make up living organisms/

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?

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

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

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?

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?