Questions Asked on
December 12, 2010

  1. statistics

    The red face cards and the black cards numbered 2-9 are put into a bag. Four cards are drawn at random without replacement. Find the following probabilities: a) All 4 cards are red b) 2 cards are red and two cards are black c) At least one of the red cards

    asked by oscar
  2. physics

    The length of a simple pendulum is 0.79m and the mass of the particle at the end of the cable is 0.24 kg. The pendulum is pulled away from its equilibrium position by an angle of 8.5 degrees and released from rest. Assume that friction can be neglected and

    asked by David
  3. chemistry

    Will sodium sulfide and iron II sulfate form a precipitate? if so what would the reaction look like?

    asked by kelly
  4. Physics

    A cube of solid aluminum has a volume of 1.00 m^3 at 20 degree C. What temperature change is required to produce a 100-cm^3 increase in the volume of the cube? I know you are supposed to use: DeltaV=Beta*Vo*DeltaT. But I don't know what Beta is and the

    asked by HELP
  5. Math

    The diameter of a car's tire is 52 cm. While the car is being driven, the tire picks up a nail. How high above the ground will the nail be after the car has travelled 0.1 km? It also asked me to graph this information. So I created a periodic graph that

    asked by Allison
  6. STUDY UNIT: MAIN IDEAS

    In comparing an oak tree with a maple tree, you can correctly say that A. oak is often used to make ships, while maple is often used for furniture. B. both maple and oak trees lose their leaves in the fall. C. acorns are good to eat, while maple seeds

    asked by Anonymous
  7. physics

    A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 210 N and is 2.80 m long. What is the tension in each rope when the 710 N worker stands 1.80 m from one end? smaller and larger.

    asked by kaitlyn
  8. chemistry

    SF4 ---> SF2 + F2 rate constant (k) = .011 l/molxS [SF4]2 How many minutes will it take for the concentration of SF4 to be reduced from 2.5 M to .25 M? I said this was a 2nd order reaction and used : (1/final)= kt + (1/initial) and solved for t. the answer

    asked by Audrey
  9. Chemistry

    A rigid cylinder contains a sample of gas at STP. What is the pressure of this gas after the sample is heated to 410 K? a. 1.0 atm b. 0.50 atm c. 0.67 atm d. 1.5 atm Explain how you get the answer.

    asked by danny123
  10. chem

    Calculate the solubility of magnesium hydroxide (Mg(OH)2), ksp=1.1x10^-11? i have done this problem so many times and keep getting it wrong, i know the answer is 1.4x10^-4 but how do i get there? i did an ice chart and tried doing the cube root but its

    asked by jessie
  11. Physics

    A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With two 5.00 g coins stacked over the 7.0 cm mark, the stick is found to balance at the 41.0 cm mark. What is the mass of the meter stick? The answer is 38g but I don't understand

    asked by Robert
  12. chemistry

    The following errors occurred when the experiment was carried out. How would each affect the calculated molar mass of the solute(too high, too low, no effect)? Explain. a. The thermometer used actually read 1.4 centigrade too high. b. some of the solvent

    asked by Bbananasplit
  13. Grade 11 math - HELP!

    The diameter of a car's tire is 52 cm. While the car is being driven, the tire picks up a nail. How high above the ground will the nail be after the car has travelled 0.1 km? can someone please explain how to solve this question?

    asked by Allison
  14. statistics 2

    A football team consists of 20 each freshmen and sophomores, 15 juniors and 10 seniors. Four players are selected at random to serve as captains. Find the probability that: a) all four are seniors b) There is one each: freshman, sophomore, junior and

    asked by oscar
  15. physics

    The volume flow rate in an artery supplying the brain is 3.10 10-6 m3/s. (a) If the radius of the artery is 4.50 10-3 m, determine the average blood speed. 1 m/s (b) Find the average blood speed at a constriction in the artery if the constriction reduces

    asked by sarah
  16. physic help

    The magnetic flux through a coil of wire changes from 8 Txm ^2 to zero in a time 0.5 s. what is the magnitude of the average voltage induced in the coil during this change? please explain your answer..

    asked by mash
  17. Alg 2

    Find A1 in a geometric series for which Sn=210, r=-2, and n=6? Can someone lead me in the right direction?

    asked by student
  18. chemistry

    if the chemical equation is CaCO3(s) + 2HCl(aq) > CaCl2(aq) + H2O(l) +CO2(g) and represents the reaction of an antacid, CaCO3, with a acid,HCl. why might someone using this antacid experience discomfort due to gas pains?

    asked by Kaila(:
  19. Chemistry

    how many molecules of CH4 gas are present in a 1.00 L flask of CH4 gas at STP?

    asked by Ivy
  20. Chem H

    How do you write a balanced net ionic equation for the reaction Cr2(SO4)3(aq)+(NH4)2(CO3)(aq)?

    asked by Sonia
  21. Physics

    A car traveling at 50 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 74 cm (with respect to the road) while being brought to rest by an inflated air bag. What magnitude of force (assumed constant) acts on the passenger's

    asked by Oriana
  22. Chemistry

    What volumes will each of the following occupy at STP? a. 1.80 x 10^24 molecules of SO3 b. 7.5 mol C2H6 c. 25.2 grams chlorine

    asked by Ivy
  23. physics

    1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing

    asked by David
  24. interesting log problem

    log base 2n 1944 = log base n (486* (2)^1/2) find n^6

    asked by maya
  25. AP Calculus AB

    A farmer wants to create a rectangular pen, which will be divided into six separate sections, as shown in the accompanying diagram. If he has 600 feet of fencing to use, what outside dimensions will maximize the area of the pen?

    asked by Valerie
  26. Chemistry

    Which quantity of particles is correctly represented by the formula H2SO4? Explain.

    asked by danny123
  27. Geometry

    Given: obtuse triangle ABC with obtuse angle B. Point D on side AC such that angle BDC is also obtuse. Angle DAB is 2/3 of angle ABD. Angle BCD is 1/5 angle BDC and angle CBD is 4 more than angle BAD. What is the measure of angle ABC?

    asked by Kathy
  28. physics

    A string has a linear density of 8.5*10^-3 kg and is under the tension of 280 N. The string is 1.8 m long, is fixed at both ends, and vibrating in the standing wave pattern. What is the speed, length, and frequency?

    asked by David
  29. 11th grade

    a rock is dropped from a 20.0m bridge falls into the river below. a.)at whqat velocity does it strike the water? b.)how much time did the rock take to reach the water?

    asked by marissa
  30. Chemistry

    A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L. What will be the volume of the dry propane at standard pressure?

    asked by Ivy
  31. chemistry

    If 2.00g of Zn is allowed to react with 1.75g of CuSO4, how many grams of Zn wil remain after the reaction is complete?

    asked by Jackie
  32. algebra

    Find the mean for each set of data. Round to the nearest tenth if necessary. 12, 20, 8, 15, 16, 14, 7, 5, 11, 8, 14 a. 11.8 b. 13.2 c. 9.9 d. 10.4 My answer a)11.8

    asked by david
  33. physics

    A cylindrical air duct in an air conditioning system has a length of 3.5 m and a radius of 5.00 X 10^-2 m. A fan forces air (ç = 1.8 X 10^-5 Pa·s) through the duct, such that the air in a room (volume = 242 m3) is replenished every 12 minutes. Determine

    asked by elmira
  34. To Khaled/Peter -- business

    I've removed your two posts with 10 essay questions. They look like a semester exam, yet you did nothing to show us your attempts at answers. This is a homework HELP site; it is not a cheat site.

    asked by Ms. Sue
  35. physics

    A string is stretched between two supports that are L = 0.9 m apart. It resonates at a frequency of f = 410 Hz with a standing wave pattern that has two nodes between the two supports. (a) Find the wavelength λ in meters. (b) Suppose that the tension, T,

    asked by sarah
  36. Physics Last Question HEEEELLLPPP !

    #1 The internal energy of the gas in a gasoline engine’s cylinder decreases by 295 J. If 47.0 J of work is done by the gas, how much energy is transferred as heat? #2 If an ideal gas does work on its surroundings: a. The internal energy of the gas

    asked by Jarrid
  37. chemistry

    the rate of formation of NH3 is .15 mol/Lmin. What is the rate of this reaction? N_2_ + 3H_2_ ---> NH3 the answer should be .075 mol/Lmin.

    asked by Audrey
  38. History

    I need help in history. I have to write a 4-5 paragraph essay on world war one, but I need information. Could someone please summarize the main things that happened in world war one? Please don't write an essay, I just need someone to tell me the very

    asked by Joan
  39. art

    • What is un bel composto (according to Bernini)

    asked by Anonymous
  40. physics

    a spring with a spring constant 30.0 N/m is stretched 0.200 m from its equilibrium position. How much work must be done to stretch it an additional 0.100 m?

    asked by Tony
  41. soc 120

    1. The average height of members of the high scho etball team is six feet, three inches. Jerry is on the high school basketball team, so Jerry must be taller than six feet. The argument above is flawed because it confuses (Points : 1) Jerry with other

    asked by maria
  42. physics

    calculate the horizontal force that must be applied to produce an acceleration of 1 g for 1 kg. puck on a horizantal frictiom-free air table.

    asked by Anonymous
  43. physics impulse

    a baseball has a mass of 0.145kg. the ball is crossing the plate horizontally at 40 m/s when the batter hits the ball. The final velocity of the ball is 50 m/s stright up. what is the impulse that the batter gives the ball?

    asked by Anonymous
  44. physics

    The pulley in Figure P8.59 has a moment of inertia of 7.0 kg·m2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless.

    asked by Anonymous
  45. AP CALCULUS PLEASE HELP DUE TOMORROW!

    5. What are the dimensions of the lightest open-top right circular cylindrical can that will hold a volume of .8L?

    asked by Adam
  46. Math

    The general gist of the question: Peter has to go to an office store, an electronics store, a clothing store, and a sporting store. There are 4 office stores, 4 electronic stores, 8 clothing stores and 5 sporting stores. How many combinations are there? Do

    asked by Melanie
  47. grade 9 math

    Trapezoid ABCD, top AD and bottom BC are parallel. AD is the smaller of the two parallel lines. Left AB is 45, bottom BC is 60, right CD is 30, top AD is unknown. Trapezoid EFGH is similar to ABCD, top EH and bottom FG are parallel. EH is the smaller of

    asked by olav
  48. chemistry

    How do you know when something has greater/smaller capacity? do you add them and the smallest one is for greater, and the biggest number is for smallest capacity? Which of the following solutions has the smallest buffering capacity? a. 0.821M HF and 0.217M

    asked by ben
  49. development

    Why is it important to study the three domains of adult development? Please help!!

    asked by Angela
  50. Chemistry

    PLEASE HELP! What amount of water could be heated from 20 degrees C to 50 degrees C by 714 kJ of energy?

    asked by Iris
  51. History

    I need help writing an analytical thesis statement. The topic is -Analyze the main problems facing the United States under the Articles of Confederation. How far did the US Constitution solve them?- I have a crappy thesis right now "The articles of

    asked by Anabelle
  52. SCIENCE!!!!!

    suppose that you dissolve 250ml of drink crystals in 1000ml of water. You get 1175ml of drink rather than 1250ml. how can you use the partical model of matter to explain this?

    asked by Kesar
  53. biology

    the unique properties of water make life possible on earth, select three properties of water and: a) for each propery, identify and define the property and explain it in terms of the physical/chemical nature of water b) for each property,describe one

    asked by Myles
  54. US History

    During the reagan years, what happened to the overall course of the budget deficit? a) it rose b) it fell c) it increased by 210 billion d) it increased then fell back to its original levels I think D is this correct ..?

    asked by Anonymous
  55. chemistry

    If you look at the side of a quarter, you can see layers of different metals. Is a coin a solid solution?

    asked by Carla
  56. math

    Solve the following linear system of equations. 3x-2y+z=2 x-y+z=2 5x+10y-5Z=10

    asked by Nick
  57. Chemistry

    What element has the final electron configuration as 3s2 3p4?

    asked by Jennifer
  58. chemistry

    A mixture of O2 and He is prepared for a scuba diver who is going to descend 200 ft below the ocean surface. At that depth, the diver breathes a gas mixture that has a total pressure of 7.00 atm. If the pressure of the O2 in the tank at 200 ft below the

    asked by steph
  59. Human service

    I have to explain why human service worker's uses the Rosenberg self esteem scale. This is what I have so far. Can you tell me where to find more information on why they use the scale and how my part sounds so far. Morris Rosenberg’s self-esteem scale is

    asked by patiance
  60. Physics I'm so Lost!!

    For a scene in a movie, a stunt driver drives a 1.90 103 kg pickup truck with a length of 4.09 m around a circular curve with a radius of curvature of 0.333 km. The truck is to curve off the road, jump across a gully 10.0 m wide, and land on the other side

    asked by Renee
  61. Highschool Physics

    A 55 kg person runs with a horizontal velocity of 8.0 m/s and jumps onto a 7 kg skateboard which is initially at rest. Assuming negligible friction, what will be the final velocity of the skateboard and the person?

    asked by Jarrid
  62. Chemistry 1

    What mass of potassium oxide is produced by the oxidation of 5 grams of potassium?

    asked by Cassandra
  63. math

    can someone please answer these questions for me?: 1. if the measure of an interior angle of a regular pentagonis 108 degrees, then the angle sum of that regular pentagon must be: A. 120 degrees B. 360 degrees C. 540 degrees D. 720 degrees 2. is it

    asked by Brianna
  64. fractions

    Mr.shafier has been teaching school for 10 years.For 6 of those years he taught 8th grade.what fraction represents the time Mr.shafier has not been teaching 8th grade?I knoe the answere is 2 5ths. but how do i show work?HELP!!!!!!!!!!!!!!!

    asked by Alyssa
  65. College Math

    For questions 1-2, apply the quadratic formula to find the roots of the given function, and then graph the function. 1. f(x) = x2 + 4 (6 points) g(x) = x2 - x – 12 For questions 3-4, factor the quadratic expression completely, and find the roots of the

    asked by jennie
  66. math

    If an annuity was set up for semiannual payments at the beginning of each period in the amount of $1,478, what would be the value of this annuity after 9 ½ years with interest compounded daily at a rate of 3.75%

    asked by meme
  67. Chemistry

    Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is

    asked by Patrick
  68. chemistry

    If I have a Galvanic cell of Nickel and Gold where Nickel is (Ni->Ni^+2 + 2e-) and the oxidation of gold is (Ag^+->Ag + e-) then do I need to double the cell potential of gold (+0.80) if I'm trying to find the standered cell potential (volatage)?

    asked by Mo
  69. math

    compute x+y, given the linear system with T is not = to 1 and with the ordered pair (x,y) as solution: x+2y=3 and Tx+(T+1)y=T+2

    asked by Anonymous
  70. precalculus

    how you do you use the power-reducing formula to find the exact value of the trig function: sin^2(37pi/12)

    asked by Jessica
  71. geometry conditional form

    I have a lot of cavities if I like candy a. Write the conditional form b. write the converse of the given conditional

    asked by Skylar
  72. physics

    1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce

    asked by David
  73. physics

    The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has

    asked by student
  74. Chemistry

    Element M(a solid) reacts with an aqueous solution of compound B to form an aqueous solution of compound C(a salt) and a gas composed of element D. When 1.000g of element M is reacted with excess oxgen 1.658g of the compound MO are formed. Compound B is

    asked by Patrick
  75. English

    I needed to know if you could tell me if I have identified the proper tense and verb of my sentences? I am not asking for the answer, just if it is correct or incorrect. The verb is in quotations and tense form in parenthesis. Thank you very much your

    asked by Mag
  76. English

    Can you please check these questions? Thank you very much. 1) Answer the following questions on literature. 2) Answer two of the following questions on the theme "fashion". 3)The Reformation derived (arouse?) from Henry VIII's quarrel with the Pope. 4)As a

    asked by Franco
  77. physics

    A 4.0 kg pulley of radius 0.15 m is pivoted about an axis through its center. What constant torque is required for the pulley to reach an angular speed of 25 rad/s after rotating 6.0 revolutions, starting from rest? What moment of inertia do I use to

    asked by erik
  78. Math

    A lottery prize worth $1,000,000 is awarded in payments of $10,000 five times a year for 20 years. Suppose the money is worth 20% compounded five times per year. What is the formula used to find the present value of the prize?

    asked by Nick
  79. phsyical science

    what do you think an atom is made up of? what part of the atom caused the particles to bounce back?

    asked by darmisha
  80. physics

    I need help with an equation for: Find the force of attraction between a bowling ball of mass 7.26 kg and the earth if the bowling ball was located at sea level. How does this compare to the weight of the bowling ball as calculated by Fg = mg? Thank you

    asked by anonymous
  81. CHEM

    Calculate q when a system does 54 J of work and its energy is increased by 61 J?? I know the total change in energy of a system is "q + w", but I don't don't how to apply this.

    asked by Sai
  82. English

    Thank you very much for your corrections.Can you have a look at the following questions for me? Thank you. 1) What do you use to carry things that you need to wash with? (a sponge bag) What do you use to wash floors? (a mop) What do you use to pour water

    asked by Franco
  83. science

    Excume me but this is my second time posting this question. could you please help me, by telling me which properties are most useful foor identifing minerals and why? The choices are: a.shape b.luster/color c.density d.hardness e.streak I think the answer

    asked by saphira
  84. Finance

    You aunt offers you a choice of $60,000 in 40 years or $850 today. If money is discounted at 11 percent, which would you choose.

    asked by Anonymous
  85. history

    what are three laws that were passed during antebellum era?

    asked by Anonymous
  86. math

    order the fractions from greates to least. 1/6, 2/7, 1/5. Can anyone help and explain this to me please

    asked by Jazmin
  87. art

    What role did art play in the religious conflict of the sixteenth-century? What were the positions of the Protestant Reformers and Catholic Church on the use and efficacy of art? how did the image debate influenced the succeeding period – the Baroque?

    asked by Anonymous
  88. chemistry

    Hi ! Could you please help me to see through this problem. *I know it's asking me to find the hydrogen ion concentration in a bleach sample. *If the pH meter reads 9.55..this suggest to me this is a base. Maybe,I can use the equation: pOH = -log (OH^-) =

    asked by Cliff
  89. ALGEBRAIC FRACTIONS

    find the illegal values of C in the multiplication statement c^2-3c-10/c^2+5c-14 . c^2-c-2/c^2-2c-15

    asked by K
  90. math

    What is 5 squared times 2 plus 5

    asked by jon
  91. Operations research

    36) Consider the following minimization problem: Min z = x1 + 2x2 s.t. x1 + x2 ≥ 300 2x1 + x2 ≥ 400 2x1 + 5x2 ≤ 750 x1, x2 ≥ 0 What is the optimal solution?

    asked by Pauline
  92. physical scince

    answer the following question: QUESTION 4: What does it mean if a compound has a solubility of 15g in 100g of water at 0 degrees Celcius? A) 100 g of the compound will dissolve in 15 g of water at 0 degrees celcius B)15 g of the compound will dissolve in

    asked by fatima
  93. pre-cal **need help for test in the morning

    Find zeros: f(x)=12x^(3)-107x^(2)-15x+24

    asked by Terri
  94. science

    How many calories does it take to evaporate 1 gm of water at 37.5 degrees Centigrade

    asked by Murray
  95. probability

    78% of college graduates say they spent two years or less at their first full-time job after graduating college. you randomly select 10 college graduates and ask each how long they stayed at their first full-time job after graduating college. find the

    asked by Anonymous
  96. 9th grade

    the atmosphere..? a. creates tides b. has no effect on heat gain or loss c. allows heat to escape quickly in order to cool the planet d. keeps heat from escaping too quiclkly into space.

    asked by Anonymous
  97. science

    a solution of hcl of concentration 1.5 mole/liter is mixed with another solution of hbr of the same concentration. calculate: 1)ph of hcl solution alone 2)ph of the final mixture

    asked by Mero
  98. PHYSICS MOMENTUM

    A(n) 3800 kg rocket traveling at 2500 m/s is moving freely through space on a journey to the moon. The ground controllers find that the rocket has drifted off course and that it must change direction by 9.2 degrees if it is to hit the moon. By radio

    asked by Jaylee
  99. Math 8th grade

    .02(2X-3)-0.03(3x(.2)=-.02

    asked by Drew
  100. Chemistry

    What is the electron configuration of 3s23p4?

    asked by Jennifer
  101. physics

    a car moving at 15 meters per second skids to a stop in 20 meters. if the car travels at 45 meters per second, how far will it skid, assuming the same constant braking force

    asked by Anonymous
  102. physic

    Two parallel wires carry current of 1.6 ka in opposite directions. the distance between the wires is r=1.6 m compute the magnitude of the force per unit length exerted by one wire on the other?

    asked by Suzi
  103. Geometry

    Given tri ABC where A(4,-6) B, (-8,2) C (-4,8) A. Write the equation of the altitudes of triangle AC b. Determine the point of concurrency of the altitudes c. What is this point of concurrency called?

    asked by Skylar
  104. social studies

    Where can I find some information about native americans

    asked by jhon
  105. Physics

    A cylinder has a cross-sectional area of 0.025 m2. How much work is done by a gas in the cylinder if the gas exerts a constant pressure of 7.8 x 105 Pa on the piston, moving it a distance of 0.080 m?

    asked by Jarrid
  106. PHYSICS HELP !!!!!

    A 55 kg person runs with a horizontal velocity of 8.0 m/s and jumps onto a 7 kg skateboard which is initially at rest. Assuming negligible friction, what will be the final velocity of the skateboard and the person

    asked by Jarrid
  107. chemistry

    A 4.0 gram sample of iron was heated from 0 degrees celsius to 20 degrees celsius, and was found to have absorbed 35.2 Joules of heat. Calculate the specific heat of this piece of iron.

    asked by Anonymous
  108. history

    would anyone know why US increased spending during WWII? for what prosperity to protect it in the US? but why did they start...

    asked by Amy
  109. Math

    How much would have to be invested at the end of each year at 6% interest compounded annually to pay off a debt of $80,000 in 10 years?

    asked by Nick
  110. physics

    A boat sails 251 km to the East and then 534 km to the North. What is the distance of the boat from its starting point?

    asked by Sev
  111. com 155 week 6 help

    I need to find the adjectives and adverbs in the following sentences, please help. I am having many problems with this. 1. The 2010 movie “Clash of the Titans is a remake of the 1981 film of the same name and not a new concept to the public. 2. Both

    asked by Leigha
  112. Algebra1

    2x-7+x=11-5x+6

    asked by marissa
  113. Grade 9 Math

    There is one large rectangle ABCD, top line is AD and bottom is BC. A vertical line is drawn from the top to bottom called GH (between points AD and BC). A line is drawn from left to right called EF (between points AB and GH). AEFG is Rectangle 1. EBHF is

    asked by olav
  114. child care

    hello i need someone to check these for me? 6) alcohol,drugs,radiation,and pollutants that affect a child development are called a.teratogens b.toxic inhibitors c.tranferal agents. d.phenylanines 10) monstrates an inability to leap over a barrier, his

    asked by tiffany
  115. history

    describe Nixon's plan to cut spending.

    asked by John
  116. Algebra

    why is any real number a solution for the equation 8y - 30 = 4(2y - 7.5)

    asked by Hannah
  117. pre-cal

    Find Zeros: F(x)=12x^3-107x^2-15x+24?

    asked by Terri
  118. Math

    The length of a rectangular field is 3 yards less than twice the width. If the area of the field is 104 squared yards, what are the dimensions of the field? The answer is W=8, L=13 How do you work it out to get the answer????

    asked by Megan Bill
  119. chem.

    I really don't understanf how jameschadwick discovered the neutron. iread websites and read the 18 pg. article but what was his experiment?

    asked by tj
  120. Math

    Solve the equation or inequality for 3(2y-4)=9-3(y+1)The answer is 2. How do you work it out to get the answer? (x+5)(x-3)=9 the answer is -6,4 How do you work it out????

    asked by Megan Bill
  121. Math

    Factor the following polynomials completely. How do you??? First question? 8x-4 Find the equation of the line that is perpendicular to 2x-y=3, and passes through the point (-4,1) The answer is -1/2x-1 ///how do you work it out to get the answer???

    asked by Tommy W
  122. trig

    Hank rides 2 hours total on a bicycle trip into the country and back. He rode out at the rate of 20 mph and returned at the rate of 24 mph. How far into the country did Hank ride

    asked by brandon
  123. precalculus

    1. Express (3x)^(1/5)(3x^2)^(1/3) using radicals 2. Simplify (8x^6 times 32y^5)^(1/2) 3. Approximate the real zeros of f(x)= 2x^4 + 3x^2 - 20.

    asked by Tiana
  124. Geometry

    Find the Coordinates of the other endpoint of a segment wiht one endpoint X(4,-6) and the midpoint M(1,5)

    asked by Jorie
  125. Geometry

    What best describes the relationship between line y=2+8 and line 4y=8x+16 A. Parallel B. Perpendicular C. Skew D. Equivalent E. Intersecting

    asked by Michelle
  126. Please check answers/ childcare

    hello i need someone to check these for me? 6) alcohol,drugs,radiation,and pollutants that affect a child development are called a.teratogens b.toxic inhibitors c.tranferal agents. d.phenylanines 10) monstrates an inability to leap over a barrier, his

    asked by tiffany
  127. Gr. 9 math

    There is one large rectangle ABCD, top line is AD and bottom is BC. A vertical line is drawn from the top to bottom called GH (between points AD and BC). A line is drawn from left to right called EF (between points AB and GH). AEFG is Rectangle 1. EBHF is

    asked by olav
  128. Dalton's Law of Partial Pressures

    A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L. What will be the volume of the dry propane at standard pressure?

    asked by Ivy
  129. math

    There are 250 applications for special training at the police academy. Only 40% of the applicants will be interviewed. However, only 46% of the persons interviewed will be ultimately chosen for special training. How many applicants will be selected?

    asked by candiie
  130. Poetry

    So this is just to double check to make sure all of these figures of speech are right. METAPHORS- thunder roared and shot crackling spears, as vicious hills unfolded, piercing wind howled in my ears, thunder crackled and exploded, and shot blinding

    asked by Mystery chicken
  131. literature

    how to identify contradictions in literature

    asked by joey
  132. English

    I forgot to include the following questions. Thank you. 1) Anne Boleyn was executed and Henry VII married another four times. Elizabeth I restored the country to Protestantism. 2) She was often portrayed holding a rainbow, bearing the olive branch of

    asked by Franco
  133. Physics

    Hellow I have questiones in physics, it's google translate so my be it's not so easy. But thanks for the help A weight with mass (m2) = 28 kg hanging from a rope. The rope runs over a frictionless pulley and attached to a box of mass m1 = 52 kg. The box is

    asked by Oddbjørn
  134. Science HELP

    state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a glass c)bubble tea d)traditional Aborigial paint made of red orchre and grease my answers= a)suspension

    asked by Arushi
  135. Algebra

    Using the compound intrest formula's A=P(1+r/n)^nt and A=Pe^rt to solve the problem given. Round the answer to the nearest cent. I have to find the accumulated value of and investment of $20,000 for 6 years at an intrest rate of 4.5% compounded

    asked by Jen
  136. phsyical science

    explain how the path of an electron differs in Bohr's model and in the modern model of the atom

    asked by darmisha
  137. Math

    Let f(x)=-(x-1)^2+4 Solve f(x)=0 to find the x-intercepts

    asked by Nick
  138. physics

    A 581 kg satellite is in a circular orbit about the Earth at a height above the Earth equal to the Earth's mean radius. the orbital speed is 5590.98 m/s. Find the period of its revolution.

    asked by kaitlyn
  139. Highschool Physics

    A cylinder has a cross-sectional area of 0.025 m2. How much work is done by a gas in the cylinder if the gas exerts a constant pressure of 7.8 x 105 Pa on the piston, moving it a distance of 0.080 m?

    asked by Jarrid
  140. Gen Chemistry

    The following absorption data of a solution was collected in a cell with 1 cm path length. The absorption of the same substance in a solution with unknown concentration was 0.197. What is the concentration of the unknown substance? c (M) A 1.00x10-3 0.119

    asked by Kevin
  141. chemistry

    what are the solvent and solute in a solution containing 100g of ethanol and 3g of sucrose?

    asked by Carla
  142. us history

    1)some cities follow a (blank) in which the mayor has limited authority. 2)A community that is near or around a city is called a (blank) 3) a (blank) is a unit of government that deals with a specif function, such as education,water supply, or

    asked by may
  143. physics

    A 685 kg elevator starts from rest and moves upward for 2.80 s with constant acceleration until it reaches its cruising speed, 1.71 m/s. (a) What is the average power of the elevator motor during this period? (b) What is the average power during an upward

    asked by Eric
  144. physics

    If 53 W of power are exerted and the amount of work done is 7 N-m, how much time did it take?

    asked by Ale
  145. Science

    I have posted this question before and I have waited for 3 hours and no one is helping me. Please help me. I have 2 questions. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish

    asked by Arushi
  146. English (Easy question)

    I'm a french dude so don't judge me :) -Children are slowly disappearing -Children began disappearing -Children began to disappear -Children disappeared Which one is the most correct form, for a short story.

    asked by ~Proch~
  147. us history`

    a settled area that is a smaller political unit then a country or city is called a what>?

    asked by eva
  148. Economics

    Are ipod nano conglomerates? Or are they apart of a conglomerates? If so, how?

    asked by Amy
  149. Biology

    what are the characteristics of a rosa indica? also i need help on the lifestyle/habitat of rosa indica too plz help appreciate the help

    asked by Navroz
  150. math

    A company requires the amount of $645,000 in 15 years to retire a bond issue. Assume they can earn 4 1/2 % interest compounded daily. What amount would they have to pay quarterly to be able to retire this debt in 15 years?

    asked by meme
  151. Geometry

    determine all possible values of x if 2x+10, 20-x, and 3(x-15) are the lengths for sides of a triangle

    asked by Skylar
  152. Physics

    A lot of mass m2 = 28 kg hanging from a rope. The rope runs over a frictionless pulley and attached to a box of mass m1 = 52 kg. The box is on a plane with endpoints in A. Oblique Planet either by angle v = 180 in relation to the horizontal. The friction

    asked by Oddbjørn
  153. businness

    Regional Integration for and Against Articles • Felix, a U.S. technology company has recently developed a revolutionary wireless phone. The product offers exciting new features along with all of the features of current products, but at a fraction of the

    asked by jessika
  154. English

    Can you please check these sentences? Thank you. 1)What factors can have an influence (play a role?) on the way we dress? 2)Are you fashion conscious? Have you ever been to a fashion show? 3)Do you belong to any fashion conscious (?) teenage group? What

    asked by Franco
  155. medical terminology

    Could someone please check my answers. If they are wrong could you give me the correct answer or tell me where to find it..Thanks in advance for all your help... 1.Uremia is the result of A. electrolye imbalance in the intracellular body fluids. B. a high

    asked by PAT
  156. ap chemistry

    what is the molarity of a solution in which 80g of CaCl2 is dissolve in 2.5 L of solution?

    asked by cassie
  157. chemisrty

    what voule of 12M hydrochloric acid must be diluted with distilled water to prepare 5.0L of 0.10M HCl?

    asked by Cassie
  158. chemistry

    what is the principle behind this test?add 5 drops of 10% sodium hydroxide and 1 drop of 0.5% copper sulfate to 5 drops of liver of pig in a sucrose solution?

    asked by Anonymous
  159. physics

    why is earth bulged at the equator?will any one explain me about this?

    asked by sanjeet
  160. a.p. calculus

    find y' of the functuion in terms of appropriate variable. simplify as far as possible. y= 1+5^x^2-4tan(3x)

    asked by nicole
  161. 8th grade

    Fun and silly slogan for element "iron"?

    asked by Tatum
  162. 7th grade

    500 words on (how) to write about the law of april 6th 1830?help

    asked by james
  163. physic

    an electric drill rated at 400 W is connected to a 240 v. how much current does it draw? explain your answer

    asked by sam
  164. college geometry

    The distance between Sue and a dude ranch was 30 miles straight accross a rattlesnake-infested canyon. Instead of crossing the canyon, she hiked due north for a long time and then hiked due east for a ahorter leg of the journey to the ranch. If she

    asked by Kathy
  165. Criminal Justice

    A rectangle has a perimeter of 48m. The width is 2m less than the length. Use an equation to find each dimension.

    asked by Steve
  166. cultural diversity

    I need help with identifying the difference in the three main groups, muslim, arabs, and christians where can I go to get some extra help

    asked by Cecilia
  167. chemistry

    a sample has a density of 55g/mol and a volume of 11mL the sample mass is?

    asked by Ki
  168. probability

    78% of college graduates say they spent two years or less at their first full-time job after graduating college. you randomly select 10 college graduates and ask each how long they stayed at their first full-time job after graduating college. find the

    asked by Anonymous
  169. Math 7th

    Write a description of each rule 2. (x,y) --> (x + 5, y - 2)

    asked by Susana
  170. chemistry

    Hello, I have a question regarding the valence electrons of transition metals. I am aware of quantum numbers etc and how the s orbital gets filled before the d orbital but my question is that is if was asked to lets say group some elements according to

    asked by Moi
  171. Finance

    You are currently investing your money in a bank account which has a nominal annual rate of 8 percent, compounded annually. If you invest $2,000 today, how many years will it take for your account to grow to $10,000?

    asked by Anonymous
  172. chemistry

    how many liters of nitrogen monoxide are formed if 8.75 g of ammonia are reacted in the presence of excess oxygen?

    asked by Nicole
  173. current events

    these letters genmdimbserausit need to be unscrambled into two words and it has to do with Pearl Harbor attack.

    asked by Anonymous
  174. Calculus

    Hello! I am a little stuck (probably because I cannot remember my trigonometric functions). Does anyone know how to solve this equation? [-sin(x)]^2-2cosx

    asked by Joe Schmo
  175. Gr. 9 Math (continued)

    I don't see a problem but I will rewrite the structure. Make two rectangles attached together. Call the first rectangle ABHG (AG top, BH bottom). Call the second rectangle GHCD (HC top, GD bottom). Draw a horizontal line from line AB to line GH and name

    asked by olav
  176. Science

    Could you please help me, by telling me which properties are most useful foor identifing minerals and why? The choices are: a.shape b.luster/color c.density d.hardness e.streak I think the answer is color/luster, streak and hardness.

    asked by Saphira
  177. AP Calculus AB

    The sum of x and y is 8. What is the maximum value of xy-x^2? Please help!

    asked by DUE TOMORROW NEED HELP!
  178. Chemistry

    Which one in this pair has the larger radius? Explain a. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion

    asked by Ivy
  179. science

    I need an optometric project that will get me to state! last year i did my project over sharing mascara! anyone have GOOD ideas??? please i need a project badly :\

    asked by Sammi Danielle
  180. Math

    (x,y) --> ( x-6, y - 3)

    asked by Miles
  181. Chemistry

    What happens to an electron when a photon hits it?

    asked by Jennifer
  182. english

    when writing an essay is this a good way to do it?: thesis statement body paragraphs conclusion intro

    asked by Kyle
  183. algebra

    graph the equation and identify the y intercepts y + x = -10

    asked by diann
  184. history

    Can't think of the word. What were women considered to be? like this isn't the word but house wife. Something to do with women were considered only right to stay at home.

    asked by Amy
  185. Chemistry 22

    Which one in this pair has the larger radius? Explain a. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion

    asked by Ivy
  186. Chemistry

    Why is dihelium less likely to exist than dihydrogen?

    asked by Alicia
  187. French III

    How do I put these sentences in the subjunctive tense? Please help me! It is too bad that he died sitting in his chair signing papers in his Cardinal robe.

    asked by Laura
  188. physics

    A cylinder has a cross-sectional area of 0.025 m2. How much work is done by a gas in the cylinder if the gas exerts a constant pressure of 7.8 x 105 Pa on the piston, moving it a distance of 0.080 m?

    asked by Jarrid
  189. Chemistry

    What is the difference between a ground state electrom configurationa dn a final electon configuration?

    asked by Jennifer
  190. physics

    While travelling a distance of 27m the velocity of a train increased from 12m/sec to 54km/hr what is the uniform acceleration of the train.

    asked by sumendra
  191. Algebra

    A home’s back yard drops 9 feet over a horizontal distance of 124 feet. Find the slope of this back yard. Round your answer to two decimal places

    asked by Rebecca
  192. biology 30

    effects of menopause

    asked by Anonymous
  193. Finance

    CC company's bonds mature in 10 years and have a par value of $1000 and an annual coupon payment of $80. Market Interest rate for the bonds is 9%. What is the price of these bonds?

    asked by Rod
  194. Math

    factor out 16x^2-80+100

    asked by Cody
  195. algebra

    What is summation from zero to n of n+r C r.1/2^r?

    asked by Prajnanaswaroopa
  196. physics

    An object sits 29m above the ground and has a mass of 47 kg. How much potential Energy does it posses 1.5 seconds after falling?

    asked by Anonymous
  197. social studies

    What challenges might the United Kingdom face if the diversity of its population continues to grow?

    asked by tony
  198. adult education

    (s+25)/2-100x10=5 solve for s

    asked by Nicole
  199. computer architecture

    How many bits does a word of storage contain on the IBM-PC?

    asked by JJ
  200. chemistry

    Which acid,if it reacts in tincture of NaOH forms sodium hypochlorite?

    asked by Vlera
  201. English

    I have to write a paper about how Through The Looking Glass is a sequel to Alice's Adventures in Wonderland. How are they different and how is it a sequel to it? I read the books but I don't know where to start

    asked by Jonathan
  202. Algebra

    The world's largest lollipop weighs 2220 pounds, which is 10,126 pounds lighter than the largest Popsicle. What is the weight of the largest Popsicle?

    asked by Anonymous
  203. maths

    find the area of a square ABCD 16 square meter.find the area of the area joining mid points of the side

    asked by ash
  204. Business

    the primary audience for your mrssage is made up of? a. decision makers or opinion molders in an organization b. everyone who receives it c. individuals with highest status in an organization d. people who represent the opinions or attitudes of the

    asked by Nancy
  205. a.p. calculus

    find y' of the functuion in terms of appropriate variable. simplify as far as possible. y= ln(1+e^2x)^3

    asked by nicole
  206. Chemistry

    How many grams of KOH will be needed to boil a liter of cold water?

    asked by Liv
  207. grammar

    What are Interrogative words??? What activities are appropriate for this topic... Please help... Thanks...

    asked by klarmaesen
  208. math

    how do you compute 20 percent of 87/8

    asked by Anonymous
  209. physics

    A person walks 10 m in the + direction, 32 m in the - direction. What is the displacement of that person from their starting point.

    asked by Sev
  210. math

    hi: could anyone prove that the number of subgroups of order p of a group G is the same as the number of subgroups of index p? p is a prime here.

    asked by sylow theorems
  211. philosophy

    What is the connection between habit and moral character?

    asked by Rochelle
  212. Physics

    a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?

    asked by Andrew
  213. Physics

    a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?

    asked by Andrew
  214. chemical

    NH4Cl at temperature 20 degree lattice length 3.88 angstrum and density 1.5 gm/cm3 if the molecular weight 53.5 gm find the unit cell

    asked by muna
  215. Chemistry

    How many grams of iron can be produced of 156000 calories of heat are absorbed by a large enough sample of iron III oxide

    asked by Dan
  216. Math

    The length of a rectangle is 10 more than 1/2 the width. The perimeter is 38 feet. Find the length and width of the rectangle. The answer is L= 13, W=6 How do you get the answer???? Like how do you work it out to get that answer????

    asked by Megan Bill
  217. college geometry

    In a triangle the ratio of the base to its altitude is 2:3. If the area of the trianlge is 108 square units, what is the length of the base?

    asked by Kathy
  218. Algebra

    An operation is commutative if you can change the order of the numbers involved without changing the result. Addition and multiplication are both commutative. Subtraction is not commutative: 2 - 1 is not equal to 1 - 2. So my question is what’s the

    asked by CC
  219. 4th grade

    it is between 1 and 2 maillion. The first three digits are the same. The least possible digit is in the thousands place. The greatest possible digit is in the ones place. the hundreds digits is 1 more than the tens digit. The sum of the digits is 21.

    asked by Elizabeht
  220. college geometry

    Given: right triangle ABC with right angle at C, AC=22 and BC=6.Draw altitude CD where D is o hypotenuse AB. What is the ratio of the area of triangle ADC to the area of triangle CDB?

    asked by Kathy
  221. english

    essay on wills

    asked by zain
  222. Politics

    Is there an election coming up in May 2011? What will be decided? If I'm turning 18 in March, when am I eligible to register to vote in it?

    asked by Brie
  223. CHEM

    a solution containing 30 g of nh3 in 70 g of water has a density of 0.882 g/ml. what is the molarity and molality

    asked by MAX
  224. chemistry

    From this information- a + c_2_ ---> ac + c Slow ac + a ---> a_2_c Fast 2a + c_2_ ---> a_2_c + c Overall -you know that it is 1st order in a, 1st in c2, and 2nd overall. how? what about a reaction being fast or slow tells you if it's in first or second

    asked by Audrey
  225. chemistry

    x + 2y ---> products is first order in c and 2nd order in y. what are the units of K, the specific rate constant, if the reaction rate is expressed in units of moles per liter per sec. I know the answer is M.s^-1^ but I don't understand this concept. could

    asked by Audrey
  226. Calculus

    Hello! I am a little stuck (probably because I cannot remember my trigonometric functions). Does anyone know how to solve this equation? [-sin(x)]^2-2cosx

    asked by Joe Schmo
  227. geology

    Judging from the sizes of the before-and-after craters atop Mount St. Helens, which volcani event appears to have been more explosive, the last one before 1980, or that which occured in 1980? I thought it would be the one before 1980 since that would have

    asked by m
  228. science

    The average solar radiation incident on the surface of the earth is about 1 KW/m2 for the entire year. A solar house is built with solar panels installed in the roof to provide the heating and electrical energy of the house. If the roof has a surface area

    asked by Kim
  229. Math

    calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

    asked by Dominick
  230. Math

    what is a range, variance, standard deviation, and interquartile range

    asked by Dominick
  231. geology

    If granite were melted in the laboratory, what would be the order in which its minerals would melt. The minerals inside are: most complete large crystallized mineral is X next complete small cryastallized mineral is Z next to least large crystallized

    asked by m
  232. Math 7th

    Write a descripition of each rule 1. (x,y) --> ( x- 11, y +4)

    asked by Susana
  233. us history

    what would teddy roosevelt put in a time capsule if needed to?

    asked by matthew
  234. math

    solve v=(1/3)t+12

    asked by Allie
  235. finance

    Shafer Corporation issues callable bonds. The bonds are most likely to be called if

    asked by Anonymous
  236. Algebra 2

    Find the sum of the first six terms of the geometric series 81 -27 +9 -... how do you work it??

    asked by student
  237. math

    how to graph absolute value equations

    asked by Anonymous
  238. 9th grade

    find two powers that have a product of 96, with at least one power greater than 1

    asked by kk
  239. Math

    How many problems out of80 does a student need to have correct to receive a score of 85%?

    asked by Marcia
  240. Lang. Arts

    What are some quotes that pertain to life in the book Whirligig, by Paul Fleischman. I need 6. Thankk you(:

    asked by Delaney
  241. us history

    Why does Lincoln sign the Emancipation Proclamation even though he said early on that he wasn't going to abolish slavery in the south? What fears could have kept him from signing it?

    asked by Wyeth
  242. us history

    What advantages does the Union have over the Confederacy? The Confederacy over the Union?

    asked by Wyeth
  243. computers

    which one of the following elements must be contained in an access database

    asked by angela
  244. sentence

    where did you grow up

    asked by velana
  245. civils

    a blank includes a central city and the suburbs that surround it.

    asked by eva
  246. us history

    a larger city in which the mayor has significant executive powers usally uses a (blank)>?

    asked by eva
  247. us history

    A city that writes its own charter, chooses its own type of government, and manages its own affairs is one that has (blank)???

    asked by eva
  248. history

    does this sound right: "mobilization of goods" related to WWII

    asked by Amy
  249. us history

    A state will (blank)a locality when it officially organizes its government and provides services for its residents?

    asked by eva
  250. Math

    sin^2 theta + 2 cos theta -1/ (sin^2 theta +3 cos theta-3= cos^2 theta+cos theta/ (-sin^2 theta) Prove the identity.

    asked by Emily
  251. Science (please help me)

    I have 2 question on science 7. please help me. 1.state whether each substance is a mechanical mixture, a suspension, or a solution. My answers are at the bottom. a)green relish b)soda pop in a glass c)bubble tea d)traditional Aborigial paint made of red

    asked by Arushi
  252. APUSHistory

    Why did jackson disobey his superiors even though he was a stickler for discipline?

    asked by LULU
  253. Physic

    A spherical concave mirroe has a radius =0.4m forms an image of a 0.2 m high object located 1m from the vertex of mirror. find the position and height of the image. ? please explain your solution

    asked by mac
  254. math

    if an equilateral triangle has a perimeter of 24 inches, what is the length of each side and please explain why because i don't really understand this! help!

    asked by Brianna
  255. us history

    i need help) when a council member runs in a citywide electoin rather then representing only one district, he pr she is elected in a(an) (blank)

    asked by eva
  256. chemistry

    If iron is exposed to air, it begins to rust. What conclusion can you make about air, based on this observation?

    asked by Carla
  257. Math

    Write the Unit Rate as a fraction? 13 grams per cubic centermeters... there are other problems like this but i just need to know how to do this.

    asked by Ansar
  258. 6th grade

    analogie:After is to before as epilogue is to

    asked by ashley
  259. social studies

    what is the job of the judicial?

    asked by Daphinal
  260. Math

    Write a description of each rule (x,y) --> (x + 5, y -2)

    asked by Miles
  261. us history

    A city council is in charge of passing a city law, or (blank) < and approving the city budget. 2/ a (blank) is a document that grants power to a local government,

    asked by may
  262. Binomial Coefficient

    Evaluate: n n-2 (expression should be in large brackets) I got n! /n-2! 2! . I know this is wrong but am not sure what to do next.

    asked by Robo123
  263. History

    Name three people during antebellum era that weren't president that were helpful. And what did they do.

    asked by Addison
  264. English

    I'm writing a paper and don't know if this sentence sounds alright. I face challenges head on and when I want to complete something I remain committed till I accomplish it.

    asked by Jon