1. Physics

Why is Young's experiment more effective with slits than with the pinholes he first used?

2. physics!

A stretched rubber band has a length of 0.10m and a fundamental frequency of 440Hz. What is the speed at which waves travel on the rubber band? I need some ideas to do this problem. Thanks!

3. geometry

How do you find the surface area of rectangular prisms and cylinders??????

4. physics!!!

A small spherical insulator of mass 8.00*10^-2kg and charge +6.00*10^-7C is hung by a thin wire of negligible mass. A charge of -9.00*10^-7C is held 0.450m away from the sphere and directly to the right of it, so the wire makes an angle with the vertical.

5. chemistry

1)calculate the pressure, expressed in pascals, that the brick exerting a force of 18N, and dimensions od 9.3cm x 5.5 cm. I know that Pressure = force divided by the area. the answer I got was 0.4Pa. Is this correct? 2) why is an ax more useful to use (in

This is the article: Controlling Irrational Fears After 9/11* We present this selection as an example of a fairly well-reasoned argumentative essay. There is more here than arguments—there’s some window dressing and you’ll probably find some slanters

7. ap physics

I need some help with the following problems. I got no idea how to do it...PLEASE HELP!!!!THANKS A LOT!! A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than the other. He

8. Chemistry

an air bubble trapped in bread dough at room temperature (291k) has a volume of 1.0mL. The bread bake sin the oven at 623k(350C) calculate the new volume of the air bubblr, using charles law( Volume divided by Temperature= K) my answer is: 1.0/350C =

9. physics

The A string on a string bass is turned to vibrate at a fundamental frequency of 55.0Hz. If the tension in the string were increased by a factor of four, what would be the new fundamental frequency? I need some guides to do it. Thx.

10. English Expressions

1. She has a ponytail. 2. She has pigtails. 3. She has braids. 4. She has long curved hair. 5. She has short wavy hair. 6. He has medioum-length straight hair. 7. He has average-length curved blond hair. ----------------------- Are the expressions above

11. chemistry

In planning to administer a gaseous anesthetic to a patient, A) why mus the anthesiologist take into account the fact that during surgery the gaseous anesthetic is used both at room temperature (18C) and at the patients body temperature (37C)? B) What

12. English Expressions

Let's play the bingo game. Look at the big bingo board. There are expressions in each box on the bingo board. There are nine sentences in theboxes. You should write the sentences again with contractions in the boxes on the smaller bingo board randomly.

13. PHYSICS!!!HELP！！

An aircraft carrier has a speed of 13.0m/s relative to the water. A jet is catapulted from the deck and has a speed of 67.0m/s relative to the water. The engines produce a 1550-Hz whine, and the speed of sound is 343m/s. What is the frequency of the sound

14. English Expressions

Will you check the following English sentences? 1. Paying attention to the intonation mark, listen carefully. (Do I have to use 'mark'?) 2. Put your tongue between your upper teeth and lower teeth, and say th by letting the air over your tongue abruptly.

15. chemistry

a 3.0L helium balloon is placed in a car sitting in hot sunlight. The temperature in the mall, when the balloon was bought, was 22C. The temperature in the car is 45C. what will be the new volume of the of the balloon. Will it be: 6.14L? I would think this

16. Govt. accounting

The following information relates to Dell City, whose first fiscal year ended December 31, 2006. Assume Dell has only the long-term debt specified in the information and only the funds necessitated by the information. 1. General fund: • The following

17. science

What are some freshwater invertebrates?

I need 75 of these surveys filled out to do a regression analysis for Economics. Just answer the 10 easy questions for me please. 1. Do you exercise or work out on a regular basis? 2. Are you male or female? 3. Do you smoke? 4. How many carbonated soft

19. engglish revised

In the first argument, the writer is trying to establish a plausible argument on catastrophic events, such as the 911 attacks on the World Trade Center, and how we as Americans are more susceptible to react with rage, when an event of this magnitude hits

20. COM 215

The trip schecduled for Mexico during spring break has been cancelled due to the bankruptcy of the bus company. You must tell 25 of your classmates that the trip has been cancelled and that they have lost their \$100 deposit. How will you convey the

Given a lapse rate of 3 degrees C/1000 meters and a temp of 20 degrees C at 0 meters: A.What is the air sitting at 3,000 meters elevation?___degrees C B.If a sample of air were lifted from 0 meters to 3,000 meters elevation, what would its new temp

22. Algebra

Solve the equation identify as an identity, an inconsistent equation or a conditional. My equation is 1-3/2x+7/4 I know the answer is Conditional {-2}, but I cannot figure out how to get it or even where to start.

23. Health

If a six year old boy is noticeable taller than his classmates(He is 5 feet, 7 inches tall) what gland problem may he have? I think it's Dysfuntion of the throid gland Thanks for your help

PLease see if I am right When you do a push up from the floor what kind of movement describes the motion of your elbow flexion

25. algebra

If y=7.2 when x=10, what is the value of x when y=20?

26. Logarithms

Hi, Can anyone tell me if the following are correct please:- If x = 10y (where x > 0), then log10 x = y if a and b are positive numbers, then, 2 log 10 a / b = 2log 10 a - 2 log 10 b and lastly if a and b are positive numbers, then, log 10 ( a+b ) = 10 log

27. english-final revision

Thanks a lot Ms. Sue. Have a great easter. Rose

28. Algebra

I am confused about how to graph two numbers on the same line. I need to graph: x/+ -4 both on the same line I have: -6 -5 [-4 -3 -2] -1 0 1 2 solid line I am not sure if I have the right [ or if I need a ( and if I need a solid line.

29. Biology

I need help on classifying different species into Kingdom, Phylum, Class, Order, Family, Genus, and Species. We need to do around 42. Thanks.

30. French

One more question please. It sais: "nous avons besoin DES nombres pour le commerce" and then a bit later on: "nous avons besoin DE nombres pour désigner les dates...." Why once DES and the DE ?? Is it because "le commerce" is a noun and "désigner" a

31. Maths

solve for r r^64-1 = 2.5x10^7 (r-1) any ideas?

32. computers

digital logic design ( i have a lot questios so please help me) Proof that: A¡¦.B + B¡¦.C¡¦ + A.B + B¡¦.C = 1 Q3 [2 points], According to DeMorgan theorem, the complement of W . X + Y . Z is W¡¦ + X¡¦ . Y¡¦ + Z¡¦ Yet both functions are 1

33. Religion

What is some History Of the Presbyterian Church

34. French-how to make accents

What are the keyboard shortcuts for typing French accents? thanks

35. English

What is author style?

36. Algebra

find the slope of the line a lineperpendicular to -4x+4y=-2 answer is the slope of the line is -1.

37. Physics

Which will give wider-spaced fringes in a double-slit experiment, red light or violet light?

38. Physics

If the path-length difference between two identical and coherent beams is two wavelengths when they arrive on a screen, will they produce a dark or a bright spot?

39. algebra

If x is inversely proportional to y, and x=60 when y=0.5, find x when y =12

40. 12 Biology! URGENT!

Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall

41. Physical Science

A friend tell you that a refrigerator door beneath it's layer of white painted plastic, is made of aluminum. How could you check to see if this is true withoutscraping away the plastic?

42. 12 Biology! URGENT!

Is this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall

When you swallow a peanut, the peanut first comes in contact with the what ? I am not sure can you please let me know of any web sites that may help thanks

Please check my answer thanks Which of the folowing process is achieved through osmosis ? A. A cube of sugar didilving in coffee B. Particles of oxygen filling the lungs C. Water moving across thr cell membranne D. Transport of proteins from the

The cellular process involves mitosis is fertilization ? True or False I picked True

46. Health

The constituents of DNA are what ? Sugars and lipids am I right ?

47. Algebra

Can someone tell me how to find a perpendicular line -3x+5y=7 My choices are 7/5 3/5 -5/3 -7/5 I cannot figure this out

48. Algebra

Find the equation of the line in stardard form (-5,-1) and (5,7) I can get it to 7=8/5(5)+b 7=8+b b=-1 but I can not figure it our from here answer 8x-5y=-30

49. Science

The question I have is based on air having a density of 0.0013(g/mL). What is the mass of 550mL of air? How do I use the formula Density = mass/volume to solve this problem?

50. biology

this right: Place numbers beside the statement below to indicate the order of events occurring in the light reactions: 3 low energy electrons at PSI are re-energized by a photon of light 5 electrons energized at PSII jump to a higher lever, as they fall

asked by I NEED Biology help
51. Algebra And Trigonometry

After finding the values by using half angle formula, how to determined the quadrant

52. computers

(Digital logic) using truth table Demonstrate that: X’. Y + Y’. Z + X.Z’ = X.Y’ + Y.Z’ + X’.Z

53. Math

What is 21 S on a D

54. math

what is 15 R on a S T

What are some essential questions that you would include in a discussion about a book?

56. InDesign

True or False? Text used in InDesign must be created in InDesign.

57. English

What are basic literary elements?

Where could i find the correct order of how sound waves or sent to the brain ? thanks

59. Physics

In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this so?

60. Physics

By how much shoould a pair of light rays from a common source differ in length to produce destructive interference?

61. Algebra

The first two terms of a geometric sequence are a1=1/3 and a2=1/6. What is a8, the eighth term?

62. englishrevised

what to you suggest for those words.

63. english- final revision

In the first argument, the writer is trying to establish a plausible argument on catastrophic events, such as the 911 attacks on the World Trade Center, and how we as Americans are more susceptible to react with rage, when an event of this magnitude hits

64. Physics

Is getting shot considered to be an elastic or inelastic collision if blood shoots out everywhere?

65. Religion

Are there church websites where I can download a lot of wmv or avi sermon files with ease? If you know them, would you let me know?

As a case manager what moral responsibilities would you have as a health in the field?

67. Math

Please help Which of the following numbers are integers 2/3, 35, 0.093, -650, 42.5 Determine the maximum and minimum values of the following set of numbers 3. -36/7, -1, -2/3, 5/4, -5, 26/9

A cell digests proteins through a ___________ process? Where I can I get some information on this thanks

69. Health

Normal urine is____________ as indicated bt it's ph value I think it is slightly alkaline please check my answer thanks

70. Algebra

Solve the equation identify as an identity, an inconsistent equation or a conditional I know the answer is Conditional {-2}, but I cannot figure out how to get it or even where to start.

71. history

Discuss the transformation from agriculture to industrial of United States from 1865 -1940

72. Speech

Where can I find newspaper or magazine articles on the pet population problem?

73. literary

the point of our highest interest and greatest emotional involvement in a narrative

74. math

How do I find the k,c,V.S., and P.S. when I have a chart of monthly temps for a year?