1. CHEM

A) a picture shows a container that is sealed at the top by a movable piston. Inside the container is a ideal gas at 1.00atm , 20.0 *C, and 1.00L. (The pic is of a 2L container which has a piston pushed downward to the 1L level. Under the piston, under the

2. CHEM

A cylinder with a movable piston contains 2.00g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the

3. anatomy

if you wanted to flex your arm, and both your biceps and triceps contracted simultaneously, what would happen? and where is most of the muscle weight found in humans?

4. physics

A 25kg child on a 2m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. (b) If the speed of the child at the lowest position is

5. Harmonic Oscillation

The velocity of a certain simple harmonic oscillator is given by: v=-(12m/s)sin [(6.0rad/s)t]. What is the amplitudeof the simple harmonic oscillator. Please show your work.

6. physics

A surprising demonstration involves dropping egg from a third-floor window so that the egg lands on a foam-rubber pad without breaking. If a 56-g egg falls (from rest) 12m, and the 5cm thick foam pad stops it in 6.25ms, by how much is the pad compressed?

7. AP Chemistry

Finish the equation: Solutions of zinc sulfate and sodium phosphate are mixed

8. Algebra

At 3PM, two ships started sailing toward each other from ports which were 265 miles apart at average rates of 18 and 23 miles per hour. At what time were the ships still 60 miles apart? Let t=time=5 hours Let 18t= first ship=90 Let 23t= second ship=115

9. math

Suppose that the time (in hours) required to repair a machine is an exponentially distributed random variable with parameter λ (lambda) = 0.5. What's the probability that a repair takes less than 5 hours? AND what's the conditional probability that a

10. Chemistry

Hydrogen sulfide H2S is produced during decomposition of organic matter. when .5000 mol H2S burns to produce SO2 and H2O. -281.0 kJ of heat is released. what is this heat in kilocalories. Can you help me start this please

11. physics

An airplane of mass 1.5x10^4kg is moving at 60m/s. The pilot then revs up the engine so that the forward thrust of the propeller becomes 7.5x10^4 N, find the speed of airplane after it has traveled 500m. Assume that the airplane is in level flight through

12. Chemistry

a. How many moles of Na2Co3 were present in the 15mL sample? b. How many grams of Na2CO3 were present in the 15mL sample? c.How many grams of Na2CO3 are present in the 575L of the Na2CO3 solution?

13. physics

A 50kg student climbs a 5m long rope and stops at the top. (a) What must her average speed be in order to match the power output of a 200-W lightbulb? (b) HOw much work does she do?

14. music

why is sonata-allegro considered to be dramatic and rewarding?

15. Physics

A box accidentally falls from the back of a truck and hits the ground with a speed of 15m/s. It slides along the ground for a distance of 45 m before coming to rest. Determine a) the length of time the box slides before stopping c) the time it takes to

16. Chemistry

Balance Eq.: Na2Co3+ CaCl2--> CaCo3+ 2NaCl. (CHALK) Calculate the mass of a dry precipitate. Calculate the mass of moles of the precipitate produced in the reaction.

17. Statistics

The 95% confidence interval is: (a) Larger than the 99% confidence interval (b) Smaller than the 99% confidence interval (c) The same as the 99% confidence interval

18. Chemistry

Copper dissolves in nitric acid, producing copper (ll) nitrate. After reaction with sodium hydroxide and heating, copper nitrate changes to copper (ll) oxide. Calculate the percent yield of this process if 1.235 g of copper produced 1.452 g of copper

19. Chemistry

a. How many moles of Na2Co3 were present in the 15mL sample? b. How many grams of Na2CO3 were present in the 15mL sample? c.How many grams of Na2CO3 are present in the 575L of the Na2CO3 solution?

20. AP Physics

An airplane in a horizontal circle at a speed of 130.5556 m/s. If its wings are tilted 40 degress to the horizontal, what is the radius of the circle in which the plane is flying? Assume that the required force is provided entirely by an "aerodynamic lift"

21. Physics problems

Hi, everyone who is going to read this, thank you for trying to help me, this really means a lot to me, you are saving my behind! Ok, so here it goes: I was wondering if this information is correct; please tell me if it is not A Ferris wheel is a vertical

22. Chemistry

The half-life of iodine -125 is 60 days. What fraction of iodine-125 would be left after 180 days? my teacher didn't teach us this and expects us to know it and I don't understand!!! could you explain it please!?

23. CALCULUS

if a ball is thrown vertically upward with a velocity of 80m/s then its height after t seconds is s=80t-16t^2 a) what is the maximum height reached by the ball? b)what is the velocity of the ball when it is 96 ft above the ground on its way up? on its way

24. Physics

A plane leaves Toronto and flies with an airspeed of 2.20 x 10^2 km/h always pointing due east. A wind is blowing from the north at 8.0 x 10^1 km/h. a) What is the plane's velocity relative to the ground? b) What is the plane's displacement from Toronto

25. Algebra II

A feasible region has vertices at (-3,2),(4,1),(2,6) and (1,-2). Find the maximum an minimum values of the function f(x,y)=4x-y

26. math

Find the differential of each function. a) e ^ tan(pi*t) b) sqrt (8+ln(z))

27. pigskin geography

what are the answers to week #9 for pigskin geography

28. Chemistry

A bullet weighing 235 grains is moving at a speed of 2.52 X 10^3 ft/s. Calculate the kinetcic energy of the bullet in joules ahd in calories. One grain equals 0.0648 g. Can someone help me out on this please

29. What's another word for power-hungry?

What's another word for power-hungry?

30. Chem

Is this the balanced chemical equation for reaction between NaBr and H2SO4? H2SO4 + NaBr ---> HBr + NaHSO4

31. Repost Social Studies for Shayla

socoal studies - shayla , Sunday, October 28, 2007 at 12:56am what were the imports and exports of colonial Maryland

32. Writing/English

I was wondering if someone could look over this softcopy resume Nicole Medina Campus Address Permanent Address Education [Click here and state your degree earned, year graduated, school attended] Courses Related to Major: Cake Decorator I started training

33. Resume help

I really do not find many cake decorating positions needing a resume so I went with what I am studying in school. Is this ok? Career Objective: To assist the sick as a registered nurse. I would also like to become a traveling nurse at some time to. I am

34. Algebra II

Solve the following system. Then explain what your answer means in the context of the problem. 3x+3y=-15 x+y=-4

35. Writing/English

I was wondering if someone could look my softcopy resume over. Is this good for a softcopy? Thanks for the help! :) Name Address Cake Decorator I started training to be a decorator in 2003. I became a part time decorator about a year later in 2004. Now in

36. Algebra

The measure of the largest angle of a certain triangle is 6 times the smallest. The measure of the remaining angle is 100 degrees less than te sum of the other two angles. Write a system of 3 equations you could use to solve this problem. x=smallest

37. Psychology

How do traumatic brain injuries occur. I don't mean like concussions or contusions though. I am trying to write a report on how brain injuries affect personality but i am not sure how a serious brain injury occurs.

38. Cacluluc CHECK

A survey of one thousand people found that 70% of the people have a CD player, 85% have a telephone, and 45.2% have a computer. At least how many people have all three objects? Is the answer 152?

39. Biology

What is the location and function: - the speech area of the brain - the comprehension area of the brain

40. algebra

1750 divided by 2 times 1/5 equals x divided by 2/6 is that a 3 step equation and should the answer turn out to be 58.333333333

41. AP US History

I have an essay test tomorrow and i am having trouble with this question. In what ways was Andrew Jackson a states' rightist and in what ways was he a nationlist? Thanks for any help you can give.

42. math

The only perfect number of the form x^n + y^n

43. History

Who are the Greek gods/goddesses that make the 12 members of the council? I think they were called the Olympians. I tried researching it online but websites are giving me different answers.

44. Algebra II

What is the first step for solving this system by substitution? DO NOT SOLVE!! 3x-2y=8 x+7y=10 How many solutions does this system of equations have? 3y-6x=12 y-2x=4 My answer is 1 solution. Is this correct?

45. Science

Ok so I have to use kinematic equations to solve these. But I make like a X and Y chart Ex...X|Vix=2.89 dx=? t=? Y|Viy=0 dy=3.7 and so forth. 1. A cliff diver strikes the water 10.3 meters from a cliff 25 meteres high. At what horizontal speed did he leave

46. anatomy

if you wanted to flex your arm, and both your biceps and triceps contracted simultaneously, what would happen? and where is most of the muscle weight found in humans?

47. calculus

determine the open intervals on which f(x) is increasing, decreasing, concave up and concave down. f(x)= tanx, -pi/2< x< pi/2

48. Algebra II

Solve this system by substitution 2x-3y=12 x-4y=6

49. Statistics

For two normal distributions with the same mean, but different standard deviations, the 95% confidence interval will be: (a) The same for both distributions (b) Larger for the distribution with the smaller standard deviation (c) Smaller for the

50. math

1) Michelle reads 1,200 words in 7 minutes, and Tricia reads 700 words in 3minutes. Who is the faster reader 2)Write 566 2/3% as a fraction or a mixed number 3)Solve for the base in the following statement 11% of what number is 77 4)Simplify 8 qt 7 pt

what would be a good imagery to start of my paragraph about how downloading music is a downfall to the music industry?? i really need help...

52. algebra

i need to download a graphing calculator onto my computer. i have tried grapgcalc . com and gcalc . com but my computer will not dowmload from these sites. anyone know where i can download a graphing calculator?

53. physics

A 650kg elevator starts from rest. It moves upward for 3s with constant acceleration until it reases its cruising speed, 1.75m/s. (a) what is the average power of the elevator motor during this period? (b) How does this compare with its power during an

54. Physics: Equilibrium and Inclined Planes

Two forces act on an object. One force is 8.0 N horizontally and the second is 10.0 N vertically. Find the force that will produce equilibrium for the object.

55. Physics and Dr. Bob

Not be to a nag, I was just wondering (in addition the energy section from my previous post)...in the wheel the electrical energy is present due to the motor. THis is then turned into kinetic energy, from the magnetic field that is created due to the

56. Social Studies

I have to do a 1 mintute report on Mother Jones, acting as if i was her. I have all the facts, but can't think of a good opening sentence. I got a closing one though..

57. glucose question

Assume that the organism is living areobically and that one molecule of glucose oxidized completely to 6 CO2 generates 30 molecules of ATP, how many glucose molecules must be oxidized to supply the energy for the synthesis of all these different nucleic

58. sexual development

32. What happens to the sexual development of a fetus (genes not specified) that is exposed to lower than the normal amounts of both testosterone and estrogen during early development? a. It develops a more or less normal male appearance b. It develops a

59. Spanish (Foreign Language)

What is 'treasure chest' in Spanish?

60. Physics

How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?

61. GENETICS

With regard to pattern baldness in humans (a sex-influenced trait) a woman who is not bacld but mother is bald, has children with a bald man whose father is not bald. what are their probabilities of having the following types of families? a) their first

62. fish tank;; deals with volume. :]

A cylinder shaped fish talk is 40cm high and has a radius of 12cm. The tank with be layed with a decorative gravel on the bottom. The blue layer will be 2 cm high. The yellow layer will be 3 cm high. And the green layter will be 2cm high. [assume water

63. spanish

is there anywhere that i can get a translation of some problem words?

64. World History

Name the natural berriers that protected egypt

65. Algebra 1

A LINE CONTAINS (9,Y) AND (-6,3). IT HAS A SLOPE 6. FIND Y

66. Islam

Assalamualaikum I Rely need help your help to answer this question. 1) In the Quran 3:159 “…then when you have taken a decision, tawakkal (put your trust )in Allah. Syed Qutb , says that the Rasul s.a.w. quotes this verse when the sahabah went to see

67. FRENCH

I wasn't sure if I had to post a new thread but here's what I have from before corrected to the best of my abilities so can anyone please read it over again and help correct the mistakes? Thanks! Il était une fois, dans une contrée bien loin d’ici, un

68. spanish

what does fui a la oficina de correos cerrada cafe mean?? and does it make sense>?

69. English

Any one got any book recommendations for a 8th to 9th grader?

70. Chemistry

The half-life of iodine -131 is 16 days. If you start with 100 gram sample, how many half-lives have past when you have less than a gram left?

71. math

To make shelves for a bookcase, Nate needs 7 pieces of lumber, each 45 inches long. Nate has several 10-foot lengths of lumber in the width and thickness he needs. How many of these 10-foot boards will Nate use?

72. FRENCH

Can someone PLEASE proofread this? It's due tomorrow... Après un certain temps, Bugs Bunny a surgi et il a dit « Quoi de neuf, docteur? » Lorsque Markey lui a rapporté qu'il recherche les trésors de la Montagne des Bonbons, le lapin débonnaire a

73. geography

i need a three page essay on kielder water but all ive done is one page! i need help! 2 days til the deadline! aaaaaaaaaaargh!

asked by i forgot my name!
74. English

How does this poem sound? I told my friends I was no scaredy cat, Not afraid of snakes, nor bears or bats. The said” Oh, well that’s sure to change, When you spend a a night in a house that’s strange.” They dared me to sleep in an abandoned house

75. science

what is the mass of 15mL for mercury?

76. Algebra II

How do you find the inverse of a matrix?

77. Writing/English

So sorry...what if you do not have experience in a field but are studying to be in it. I could state everything I have done but no background... should I explain that in the resume?

78. Physics Stuff

Hi, everyone who is going to read this, thank you for trying to help me, this really means a lot to me, you are saving my behind! Ok, so here it goes: I was wondering if this information is correct; please tell me if it is not A Ferris wheel is a vertical

79. insulin levels

13. Consistently low levels of insulin will produce ___ appetite; consistently high levels of insulin will produce ___ appetite. a. Increased…decreased b. Decreased…increased c. Decreased…decreased d. Increased…increased I chose answer D. because

80. eating binges/emotional psychology

18. Compared to overweight people, normal-weight people are ___ likely to engage in eating binges, and ___ likely to experience emotional problems. a. Less…more b. Less…less c. More…less d. About equally…about equally I chose answer C. because

81. absolute maximum

absolute maximum of (x^2-4)/(x^2+4) the critical numbers i got was x=0,-2.59, and 3.09 the absolute minimum is f(0)=-1 what is the absolute maximum: is it both f(-4)=(f(4))=.6? or can there only be one

82. Nautical Studies

I am aware a magnetic compass is useless for navigational purposes in the region of the magnetic north pole. How far away from the magnetic north pole do you need to be before the magnetic compass will function effectively? Depending on the answer does

83. Physics

I am trying to come up with a rule of thumb/rough guide to determining the velocity of a person jumping from various heights into water - for example from the side of a ship. Not being a natural mathematician I am having difficulties. My own conclusions if

84. social study

10 racially motivated and historical events that made an mpact on the country from 1980-2000

85. English - need one word that best decribes...

What's one word that describes a villain who will do anything like deceit people, abuse his powers and murder to get what he wants (Please DON'T SUGGEST the word MACHIAVELLIAN!!!!!!!!...)

86. FRENCH

Can someone please proofread this? It's the next part of my story. Thanks! Petit Markey, aventureux comme toujours, a entrepris sur son voyage vers les citrouilles illuminées avec les grands nez anormalement qui ont ressemblé les poires très poilues. En

87. IB Math Studies

Would it be appropriate to use a chi-square test for analysis of statistics in the following topics? •Number of Surgical Fatalities vs. U.S. State •Number of professional men’s soccer injuries vs. country of their team

88. Nautical Studies

I am trying to find an up to date position for the Magnetic North Pole. All searches I have made state positions that are several years out of date. Can anyone help Thanks Mike

89. biology

another name for a large molecule

90. civics

minnesotas state constitution was written in what year?

91. math

The only perfect number of the form x^n + y^n

92. AP US History

what happened during the women's education reform? What did they fight for?

93. english

Why were people accused of being witches i mean i understand that some were accused because of people not likeing them but how did this all get started?

94. physics

how do we use indirect measurements in the real world

95. SCIENCE

I REALLY need help. how do you set p a population density problem??? i totally forget!!

96. biology

correction to earlier question another name for a very large molecule

97. crt 205

What kind of fallacy is this example? It takes someone with a really big heart to give to our charity,and you seem like someone who cares more than most.

98. Math

What is 875 times 1/5 equal

99. Statistics

what is a least squares regression line?

100. Engineering

How does an air conditioner use the first and second laws of thermodynamics?

101. lit.

is there anywhere that i can read the crucible on the internet because i left my book??

102. Science

A girl makes a sample of a new material and says that the density of the material is 0.85 g/cm. Can you tell how large a sample she made? How?

103. lit

We are learning how to put the beliefs and actions of the people during the Salem witch trials in todays terms and i used the war on terrorism...would that be the right idea?? maybe because we are trying to find the poeple that are differant than us &that