Questions Asked on
March 14, 2012

  1. Chemistry

    Estimate the standard heat of formation of one of the basic buildin block of life, the amine acid glycine. (a) NH3 (b) H2O (C) H2O2 D(NÎN)=944; D(H-H)=436; D(OÎO)=498; D(O-O)= 142; D(N-N)=391; D(O-H)=464

    asked by VybzMachine
  2. Physical Chemistry

    Estimate the heat of the formation of each of the following molecules useing the bond dissociation energies provided (in KJ/mol) (a) NH3 (b) H2O (C) H2O2 D(NÎN)=944; D(H-H)=436; D(OÎO)=498; D(O-O)= 142; D(N-N)=391; D(O-H)=464 NB>all the brackets are foot

    asked by VybzMachine
  3. earth

    Suppose that an object on Earth has a known mass of 80 kgs. Will the mass of that object be less than, more than, or the same as on the other planets in our solar system? Explain your answer.

    asked by thuy
  4. accounting

    how would the table of analysis be set up with these transactions: started business with $25,000 paid rent $2,000 purchased equipment $6,000 only paid 40% owes difference purchased food and beverage $4,000 paid 75% in cash owes difference cash sales $4,000

    asked by Keishante
  5. chemistry

    A certain first order reaction has a rate constant of 3.75x10^-2 s^-1 at 25.0C. What is the value of k at 70.0C when the activation energy is 135 kj/mol? Would I use the formula K=Ae ^-Ea/RT even though I have two temperatures?

    asked by student
  6. math

    The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 175 and a variance of 4. The material is considered defective if the breaking strength is less than 169 pounds. What is the probability that a single,

    asked by ruth
  7. Statistics

    Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 100 people. (a) How many would you expect to be between 157 and 173 cm tall? (b) How many would you expect to

    asked by Erica
  8. Further maths

    Y=x^3-6x^2+9x-4.calculate the average rate of change of y with respect to x.

    asked by Peter
  9. math

    Traditions Clothing Store is having a sale. Shirts that were regularly priced at $20 are on sale for $17. What is the percentage of decrease in the price of the shirts?

    asked by bkue
  10. math

    Anthony decided to run one mile every 5 days. John decided to run two miles every 6 days. If they both start on Saturday, April 14, when will they both run on the same day again?

    asked by Anonymous
  11. Chemistry

    How to prepare 50% of Sulphuric Acid from 10N of Sulphuric Acid

    asked by Juliana
  12. Maths

    3/4 * 6/1=4,5

    asked by Khulekani ndlovu
  13. MATH

    6:10 closer to the 6'o clock and why?

    asked by JENNY
  14. A&P 1

    Why is it important to understand the relationship between nerves and muscles?

    asked by Ivy
  15. physics

    A short box with a large flat base is made of iron. The box has mass mI = 890 kg and specific heat cI = 450 J/kg◦C. The box is filled with water. The water has mass mW = 1220 kg and specific heat cW = 4180 J/kg◦C. The box and water are initially at

    asked by Jason
  16. physics

    The electric field at a distance of 0.4m from a point charge q is 20.0N/C. Find the charge “q”. Help it seems simple but I keep getting a huge number

    asked by Nikki
  17. geometry

    Robert is making a scale drawing of a painting that is 48in. wide by 120in. high. His paper is 12in. wide and 24in. tall. He decides to use the scale 1in.= 4in. Is this a reasonable scale?

    asked by Alex
  18. Physic

    A point charge q1=-8 is located at the orgin of a rectangular coordinate system. A second charge q2=6nC is located at a distance of 0.2m from the orgin on the positive x-axis, and a third charge q3=12nC is located at a distance of 0.2m on the positive

    asked by Nikki
  19. Quantitative Analysis for Managerial Applications

    2. From the data given below calculate the value of first and third quartiles, second and ninth deciles and forty-fifth and fifty-seventh percentiles. Height in centimeters Number of students Cumulative frequency 161-167 79 79 167-173 92 171 173-179 60 231

    asked by pranjal
  20. Physics

    What happens when two speakers of a stereo are brought face to face? Why

    asked by Anonymous
  21. physic

    DR.BOB Help me!!!!!!!!! The electric field at a distance of 0.4m from a point charge q is 20.0N/C. Find the charge “q"

    asked by HELPPPPP!!
  22. Statistics

    suppose a random sample of 360 students is drawn form a population of students. Among sampled, the average IQ score is 12 with standard deviation of 3. What is the upper confidence limit of the 95% confidence interval of the population

    asked by Arona Basuti
  23. mpf

    how long will it take for $ 500 to amount $700 of interested at $8% compounded quarterly?

    asked by ahmed
  24. chemistry

    Draw the titration curve of H2C6H6O6 (ascorbic acid, diprotic) titrated with NaOH.

    asked by Bailey
  25. Physics

    Why do we see more mirages in southern states and in the summer than at other times or places

    asked by Anonymous
  26. maths

    There were 600 spectators at a tennis match.of these 144 were children and there were twice as many as women.determine how many women were there

    asked by happiness
  27. geometry

    a hemispherical bowl of radius r cm is filled with water.a sphere of radius r/2 cm is immersed in it.show that the volume of water displaces is pie r square/2 c.c.

    asked by arvind
  28. math

    a hemispherical bowl of radius r cm is filled with water.a sphere of radius r/2 cm is immersed in it.show that the volume of water displaces is pie r square/2 c.c.

    asked by help me out it's urgent
  29. Hamlet

    Paraphrase Hamlet's explanation of admiration for Horatio's character? I didn't even notice this! Could someone help?

    asked by Scarlet
  30. medical billing mid term

    what's the answer to the question number 24 on the ledger?

    asked by Tina
  31. math

    I think am not getting it right bt cos its a little bit complicated t = square root of {V/ 1/f +1/g } make f subject of the formula

    asked by Stanley
  32. Psychology

    Assume that you conducted the research study violence in young men between the ages 18-24 years old who listens to “Gangsta Rap Music’ and you have the data. Which of the methods used for analyzing survey data would you use and why? Correalational or

    asked by Sharon
  33. reed

    group of filipinos in the medical field who exemplified his or her faith by creating a difference through an act of social transformation of persons in the family ,in the community and in the global world.

    asked by anon
  34. life orientation

    Name and explain three checks and balances that are in place in south africa that control and regulate media

    asked by yamo king
  35. geometry

    wat is lateral area if base is 6 and the right angle is 8

    asked by dan
  36. PHYSICS

    As the distance of the object from the lens increases,what happens to the image size?

    asked by ANNA
  37. math

    the lateral area of a pyramid that has a base 6 and height 8?

    asked by dan
  38. math

    Mia is stacking copies of a new book in a square-pyramid display by the front window of her bookstore. for each consecutive layer, she places one book where four meet. A. I the bottom row of the display has 144 books and there is one book on the top,

    asked by Vivian
  39. math

    what is the lateral area of a regular pyramid with a base 6 and slant height 8?????????????

    asked by rob
  40. math

    1/3bh of a pyramid...1/3(16)(6)

    asked by rob
  41. Chemistry

    The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 is a) 3.5 b) 3.0 c) 2.5
 d) 2.2
 e) -3.0 i got C by -log(3.0e-3) is this correct?

    asked by Linda
  42. English

    I urgently need you to check this. Thank you, Writeacher. 1) Sorry for disturbing you again. Our secretary told me she hasn't received your headmaster's email, yet. 2) Can you please send it again to the following email address.....? We'll be organizing a

    asked by Matthew
  43. eth 125

    Throughout most of U.S.history in most locations, what race has been the majority? What is the common background of most members of this group?

    asked by deedee
  44. science

    What kind of chemical bonding occurs in bricks, elastic, rope?

    asked by long
  45. math

    What is the surface area of a cylinder with a top area of 36pi and a height of 20cm

    asked by meme
  46. science

    The Kangzi dictionary compiled in China in 1710 during the Qing dynasty encompasses 46964 characters. How many bits would it take to specify a specific Kangzi character?

    asked by long
  47. science

    How do the principles of physics and chemistry both come into play when developing new materials?

    asked by long
  48. Chemistry

    How many electrons and orbitals are represented by 2s2

    asked by Joey
  49. Chemistry

    How many electrons are in oxide and in oxygen

    asked by Tony
  50. Chemistry

    How many moles are found in 25 grams of hydrogen chloride gas

    asked by Joey
  51. maths

    Given that the equation of the circle is x^2+y^2+2x-8y+5=0 (i)find the centre and radius of the circle (ii)Determine whether the line x-3y=8 is tangent to the given circle

    asked by tembo
  52. maths

    Find real numbers x and y such that 3x+2iy-ix+5y=7+5i

    asked by moyo
  53. maths

    factorise x^3-4x62-11x+2

    asked by mateyo
  54. maths

    Prove that sin3theta=3sintheta-4sin^3theta

    asked by chama
  55. English

    Imagine you are one of the competitors in the Ten Tors Challenge. Describe your clothes and the things you will take with you on the Challenge. (Can we use both the present continous and the future when described the clothes,: I will wear/ I will have to

    asked by Matthew
  56. maths

    Given the quadratic functionf(x)=x^2+(3k+1)x+k^2,find the value(s)of kif f(x)is a perfect square

    asked by chama
  57. maths

    Without using a calculator evaluate tan 105degrees

    asked by chota
  58. English

    I left out these sentences. Thank you. 1) I hope the weather will be nice/good. I hope to have luck with the weather. If there is heavy rain, I'll have to wear walking boots. I also have a wind breaker in my rucksack in case it will rain. 2) All the boys

    asked by Matthew
  59. Statistics Question (Confidence Interval)

    A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a standard deviation of $21,756. Construct a 95% confidence interval for the average starting salary of all attorneys in the

    asked by Mark
  60. probability

    a bag contains 7 red balls, 4 green balls and 5 yellow balls. what is the probability that 3 balls drawn at random are either green or yellow?

    asked by anuj
  61. Biology

    Music Video Project Biology? Hey! So I am doing a music video project for AP Biology, and my topic is Gene Regulation. I want to know what should be the most important things I should include in my song, and what song I should use (80's/90's/Current) to

    asked by Sam
  62. physics

    A car traveling at 37 m/s breaks to a stop in 6.0 m and 3.5 s. What was the car’s acceleration? 

    asked by shelly
  63. chemistry

    what type of reaction is Al+S8=Al2S3

    asked by angel
  64. SCIENCE/ earth

    plate tectonics crossword puzzle what Qs and As can i use??????? PLZZZZZ HELP ME!!!!!!!!!!!!!

    asked by jake
  65. chemistry

    A study of the system, H2(g) + I2(g) == 2 HI(g), was carried out. Kc = 54.9 at 699.0 K (Kelvin) for this reaction. A system was charged with 2.50 moles of HI in a 5.00 liter vessel as the only component initially. The system was brought up to 699.0 K and

    asked by jayla
  66. organic chemistry

    gas chromatographic analysis of a mixture of organic compounds gave the following peak areas: 2-hexene= 2.5 2-bromogexane=4.0 2-henanol=1.8, calculate the mole percent compostion of the mixture

    asked by jessica
  67. Statistics

    Hi, Ive looked online and in my textbook but I cant a good explanation. Basically, I need a detailed explanation of why quartile deviation is very effective?

    asked by Remy
  68. chemistry

    For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction?

    asked by jayla
  69. SCIENCE/ earth

    Thanks Ms Sue!!!

    asked by jake
  70. Statistics!

    I'm doing an assignment about choosing the best promotion by analysing some sets of data that have been provided for us. Other then the mean, what would be the most effective measure to use?

    asked by Raeya
  71. physics

    As a bowling ball of radius 15.9 cm rolls down the alley to the right, a frictional force of magnitude 1.46 N, directed to the left, acts on it. Find the frictional torque with respect to an axis through the center of the ball.

    asked by John
  72. physics

    As a bowling ball of radius 15.9 cm rolls down the alley to the right, a frictional force of magnitude 1.46 N, directed to the left, acts on it. Find the frictional torque with respect to an axis through the center of the ball.

    asked by John
  73. physics

    Compute the linear momentum and angular momentum of a Frisbee of mass 0.175 kg if it has a linear speed of 1.65 m/s and an angular velocity of 61.5 rad/s. Treat the Frisbee as a uniform disk of radius 12.0 cm.

    asked by John
  74. physics

    A merry-go-round starts from rest and accelerates uniformly over 26.0 s to a final angular velocity of 5.50 rev/min. (a) Find the maximum linear speed of a person sitting on the merry-go-round 4.25 m from the center. (b) Find the person's maximum radial

    asked by John
  75. physics

    The rear window in a car is approximately a rectangle, 1.8 m wide and 0.33 m high. The inside rearview mirror is 0.58 m from the driver's eyes, and 1.64 m from the rear window.

    asked by Anonymous
  76. Chemistry

    What are the components that serve as electrolyte,anode and cathode in dry cell?

    asked by Chemo
  77. math

    Jamal currently earns $20,000 a year in gross wages. On January 1, he is due to receive a 2% COLA. What will his gross income be after the COLA takes effect?

    asked by Anonymous
  78. PHYSICS

    Question Part Points Submissions Used A baseball pitcher pivots his extended arm about his shoulder joint, applying a constant torque of 170 N · m for 0.15 s to his arm, which has a moment of inertia of 0.53 kg · m2. (a) Find his arm's angular

    asked by cindy
  79. science

    What is smog? What is the biggest source of smog today? I know smog is a type of air pollution, but I am not aware of the biggest source of smog. Anything to help with that part of the question, would be great

    asked by anonymous
  80. PHYSICS

    A weather vane initially at rest has a moment of inertia of 0.115 kg · m2 about its axis of rotation. A 44.5 g piece of clay is thrown at the vane and sticks to it at a point 10.5 cm from the axis. The initial velocity of the clay is 18.5 m/s, directed

    asked by cindy
  81. PHYSICS

    A heavy concrete panel is being lifted into position in a building by means of a crane (see figure below). The tension of 1.89 104 N in the supporting cable produces a torque with respect to point O. (Let L = 39.3 m.) (b) Find the torque.

    asked by cindy
  82. chemistry- empirical formulas

    Calculate the empirical formula of a molecule with the following percent compositions: 55.0% gallium (Ga) and 45.0% fluorine (F). mass of 100g #of Moles in 100g of the compound Ga55.0% _____ ______ F45.0% ______ _______ c. Determine the molecular formula

    asked by princess
  83. math

    A clerk can file cards at the rate of 120 cards per hour. He has a total of 900 cards to file. How many cards remain to be filed after 6 hours?

    asked by Anonymous
  84. Algebra 1

    My little sister needs help on her homework and I don't remember really how to do this. I can't tell her if the answers or if she is doing them is the correct way. So if you could please tell me the answer and how you got it that would be great!

    asked by Maria
  85. human development

    a description of ethical and legal considerations in conducting research in human development. Also explain how you would identify and reduce gender and racial biases when conducting such research.

    asked by lisa
  86. math

    abigail works at a skateboard shop. she earns $8 per hour and $1 commission for each sale she makes. from june 1st to june 5th, she saves all her money and doesn't spend anything. each day,from june 1st to june 5th, abigail worked 3 hours .on june

    asked by yes
  87. Computer Science (java1)

    can someone please tell me the equation for compshift? double Angle = 45.0; double AngleRadians; double ComptonShift ; //calculations AngleRadians = Math.toRadians(Angle); ComptonShift = Helpppp here

    asked by Nick
  88. English

    Could you please check these sentences, please? Thank you. 1) The thieves stole a lot of things but they didn't damage the house. (turn this sentence into the passive/this is part of a test: A lot of things was/were stolen by the thieves but the house

    asked by Matthew
  89. science

    What are some of the dangerous by-products of waste incineration and pyrolysis? Anything to help with this would be great.

    asked by anonymous
  90. physics

    An 9.20kg ball, hanging from the ceiling by a light wire 115 long, is struck in an elastic collision by a 1.20kg ball moving horizontally at 6.00m/s just before the collision. Find the tension in the wire just after the collision.

    asked by Anonymus
  91. math

    If a football goal is a 11.50 meters in height how long is the width

    asked by Anonymous
  92. chemistry

    If 3 moles of a compound use 12 J of energy in a reaction, what is the Hreaction in kJ/mol? A. -4 kJ/mol B. -0.004 kJ/mol C. 0.004 kJ/mol D. 4 kJ/mol

    asked by princess
  93. English

    I left out the following sentences. Please, could you check them too? 1) My backpack is very heavy because inside (in it? are both possible) there are extra clothes, food, water (or food and water) for two days, a map, and a compass. 2) I'll take a big

    asked by Matthew
  94. Biology

    Among humans, increased interest in food intake normally occurs _____. only after the production of glucose in the liver can no longer meet metabolic needs when fewer calories are taken in than are expended, but only after the body depletes its reserves of

    asked by Jake
  95. Biology

    What results would you expect if KOH or NaOH were omitted in the Benedict's test? Why?

    asked by Anonymous
  96. math

    heather's puppy has a mass of 1000 grams. what is the mass of heathers puppy in kilograms? 1000 kilograms 100 kilograms 10 kilograms 1 kilogram

    asked by yes
  97. Geometry

    The area of a square garden is 242m squared. How long is the diagonal?

    asked by Anon
  98. Geometry

    Find the length of d in simplest radical form of he diagonal of a cube with sides of s units.

    asked by helen
  99. physics

    A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work.

    asked by MiyaW
  100. Geometry

    A grid shows the positions of a subway stop and your house. The subway stop is located at (-5,2) and your house is located at (-9,9). What is the distance, to the nearest tenth unit between your house and the stop?

    asked by helen
  101. GEOMETRY

    COS of ___ = 2/14

    asked by Margearett
  102. GEOMETRY

    SIN of ___ = 2/25

    asked by Margearett
  103. math

    chiang picked 12 apples.she gave 1/6 of the apples to each of her 5 frinds.how many apples did each friend get? p.s.i am in 3rd grade

    asked by chiosna
  104. Physics grade 12

    Find the force of tension in the chain. Determine the force of compression in the support bar. Be sure to include a free body diagram as part of your solution. Now the only information given is a mass=20.4 kg and the angle 22 degrees. If anyone could help

    asked by anonymous
  105. physics grade 12

    In this problem they show a diagram of a pulley system with an inclined plane (25 degree incline). There is a box called m1=47kg resting on the incline plane and m1=35kg hanging on the vertical line. The question reads: The coefficient of friction between

    asked by anonymous
  106. chemestry

    what volume of hydrogen is formed when 3.00g of magnesium react with an excess of dilute sulfuric acid?

    asked by skhumbuzo khumalo
  107. Physics

    A roller coaster reaches the top of the steepest hill with a speed of 3.0 . It then descends the hill, which is at an average angle of 40 and is 50.0 long. Estimate its speed when it reaches the bottom. Assume kinetic friction (uk) = 0.18 .

    asked by Kristina
  108. Physics

    In the design of a supermarket, there are to be several ramps connecting different parts of the store. Customers will have to push grocery carts up the ramps and it is obviously desirable that this not be too difficult. The engineer has done a survey and

    asked by Kristina
  109. medical coding

    Gladys Swain slipped from a sidewalk curb and twisted her right ankle. Because of the severe pain she was suffering and the inability to bear weight on the foot, she sought treatment at her neighborhood hospital emergency department. The treating

    asked by Trinity
  110. Calculus

    Hi, I have a calculus question that I just cannot figure out, it is about volume of cross sections. I would very much appreciate it if someone could figure out the answer and show me all the steps. A solid has as its base the region bounded by the curves y

    asked by Michael
  111. 5th grade maths

    x y 36 10 33 9 30 8 27 7 24 6 How do I write an equation to represent the function? Please I need you help.

    asked by miki
  112. Calculus

    Hi, I have a calculus question that I just cannot figure out, it is about volume of cross sections. I would very much appreciate it if someone could figure out the answer and show me all the steps. A solid has as its base the region bounded by the curves y

    asked by Michael
  113. algebra l

    what is 1/4+b=10 using addition principles only?

    asked by misty
  114. Engineering Science (Physics)

    A platinum coil has a resistance of 3.146(ohms) at 40'C and 3.767(ohms) at 100'C. Find the resistance and the temperature coefficient of resistance at 0'C. Thanks in anticipation

    asked by Xyler
  115. Algebra

    A fish pond at the local park is a regular hexagon. a. Write a formula for the perimeter of the pond in terms of the length of a side. Explain your formula. b. Each side has a length of 7.5 feet. Find the perimeter of the pond. c. Suppose the designer of

    asked by Samantha
  116. Physics

    A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 45.0 m/s. The bat does Wnc = 65.0 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m above

    asked by Natasha
  117. physics

    The (nonconservative) force propelling a 1.50 103-kg car up a mountain road does 5.10 106 J of work on the car. The car starts from rest at sea level and has a speed of 31.5 m/s at an altitude of 1.90 102 m above sea level. Obtain the work done on the car

    asked by Natasha
  118. English

    Could you please check these last two sentences, again? Thank you. 1) On one hand, I think it would be best to organize a student exchange program for next autumn and, on the other hand see the number of students who would be interested in spending an

    asked by Matthew
  119. geometry

    In a game show, the prize is the amount of revolutions a coin would make in one kilometer times the value of the coin. Your choices are the dime or the quarter. A dime has a diameter of 188 millimeters and a quarter has a diameter of 25 millimeters. Which

    asked by Cayla
  120. Math

    If a room is 13 feet long and 12 feet wide. The ceiling is 8 ft high. I want to paint all 4 walls. If a can of paint covers 100 sq ft, how many cans of paint will I need?

    asked by Jacoria
  121. statistics

    a statistics professor plans classes so carefully that the lenghts of her classes are uniformly distributed between 46.0 and 56.0 minutes. find the probability that a given class period runs less than 50.5 minutes

    asked by samantha
  122. math

    if a a line is 2 and 7/8ths long and u take 1/2 inch off? what will it be?

    asked by Anonymous
  123. Math

    Sabrina and John cut a pie into 4 slices. Sabrina eats 2 slices. John eats the rest. What fraction names the part of the pie that John eats?

    asked by Jake
  124. Living environment(please check thank YOU Ms.Sue)

    Cause: When hydrochloric acid backs up into the esophagus Effect: called Acid Reflux Cause: As a result of the acidic ph in the stomach Effect: help break down food Cause: As the epigolottis covers the larynx, Effect: I NEED HELP WITH THIS Cause: when

    asked by Anna
  125. statistics

    assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. find the probability that a randomly selected adult has an IQ less than 20.

    asked by samantha
  126. English

    The main disadvantage of relying on a computer spell checker is that it A.takes too long to make the corrections B. can't distinguish between homonyms C.highlights all words that aren't in it's dictionary. D. may have too few words in it's dictionary.

    asked by Brenna
  127. Income tax

    Patricia professional gambler had following income expenses in her business: Gambling Winning---- $275000 Expenses Fees paid for illegal information---$18000 travel costs------$8000 office expenses ------ $ 5000 supplies------$3000 Business long dist.

    asked by Andy
  128. physical science

    a cyclist pedals at a constant velocity of 15m.s-1 on a level road. the power delivered by the cyclist is 240W. what is the magnitude of the frictional foce acting against the motion?

    asked by michael clayton
  129. income tax

    On May 26, 2007, Jamal purchased machinery for $30,000 to be used in his business. He did not elect to expense the equipment under §179 or the bonus. On October 10, 2011, he sells the machinery to a scrap metal dealer. What is his cost recovery deduction

    asked by Andy
  130. physics

    A blimp is traveling due North at 80km/hr with respect to the air, while the wind is blowing from northeast at 25km/hr with respect to the ground. What is the velocity of the blimp with respect to the ground? Thanks.

    asked by Annie
  131. physics

    If you live in a city your stove can be powered by natural gas. This gas is mainly methane gas and has a density of about 0.72 kilograms per cubic meter. What minimum sized balloon would you have to fill in order to be able to be lifted into the air? Take

    asked by dale
  132. physics

    A young girl is on a swing that completes 20.0 cycles in 25 seconds. What are its frequency and period?

    asked by ana loren
  133. 3 grade english ms sue

    possessive pronouns direction circle the correct possessive pronoun for ecah sentence. 1-Gems are some of (our,ours)most valuable rocks. my son circle the word (our) 2-(Their,Theirs)favorite gem is bright green. my son circle the word (their) 3-Diamonds

    asked by dw
  134. algebra II

    What is the simplified form of y^2 - y - 12 / y^2 + 8y + 15

    asked by Michelle
  135. algebra 2

    The larger of two numbers in 8 times the smaller. The difference between them is 42. Find the numbers. Write the equations. Find the numbers

    asked by lea
  136. Calculus

    An object is dropped from the observation deck of the Skylon Tower in Niagara Falls, Ontario. The distance, in metres, from the deck at t seconds is given by d(t)=4.9t^2 a) the height of the observation deck is 146.9 m. How fast is the object moving when

    asked by Melinda
  137. chemistry

    what is the solubility of X in mole/dm3 if 25cm of its saturated solution contains 4.0g of X.

    asked by emma 45
  138. English

    1) How can I shorten the word sixteen-year-old pupils? sixteen-year-olds? I need to include groups of students belonging to different classes. So I would like to identify them according to their age.

    asked by Matthew
  139. english

    what is sentence variety and rhythm

    asked by kathy
  140. chemistry

    a saturated solution of a salt X contains 0.28g of the salt in 100cm3 of solution at 25degree centigrate, what is the solubility of the salt X at this temperature (R.m.m of X=56)

    asked by emma gegeluv
  141. algebra

    If you purchase an item for 1,272 at an interest rate of 9.8%, and you finance it for 1 year, how much is the amount of add -on interest?(round your answer to nearest dollar.)

    asked by Mark
  142. chemistry

    Which of the following reactions have a positive ΔSrxn? Check all that apply. A(g) +B(g) -----> 3C(g) A(g)+ B(g)------> C(g) 2A (g) +2B (g)-----> 3C(g) A(s)+B(s)------> C(g) I picked the first one and it marked me wrong. Please help(:

    asked by Jerry
  143. math

    Eighty people are separated into 2 groups. The first group is 8 less than 3 times as large as the second. Find the number of people in each group.

    asked by lea
  144. math i need help miss sue please check

    What is the prime number in this fraction 5/6? Please answer that then have another response to that one. What is the square root of 69? Answer that one then simplify this 20/65.

    asked by consquela
  145. chemistry

    a saturated solution of salt X contains 0.28g of the salt in 100cm3 of solution at 25degree centigrate, what is the solubility of the salt X at this temperature (R.m.m of X=56)

    asked by emma gegeluv
  146. math

    Explain It- Explain how knowing that 5 divided by 8 = 0.625 helps you write the decimal for 4 5/8.

    asked by Gabby ( 5 grade)
  147. math

    A rectangle has a length of 4x and a width of 4x-2. Its perimeter is 12 inches. Find the length and width. Write the equations. What is the length and width?

    asked by lea
  148. chemistry

    Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=654.9J/mol*K

    asked by Kelsey
  149. Accounting

    Della purchased a warehouse on February 25, 2011, for $350,000. $45,000 of the price was for the land. What is her cost recovery deduction for 2011 rounded to the nearest dollar? A. $6,853 B. $7,865 C. $9,705 D. $11,137 is it D

    asked by Andy
  150. math

    The length of a rectangle is 4 times the width. The perimeter is 50cm. Find the length and width. Write the equations. What is the length and width?

    asked by lea
  151. CHEMISTRY

    HOW MUCH 1 MOLE HCL IS REQUIRED TO MAKE 250ML OF 0.1 MOLE HCL?

    asked by NANCY
  152. p

    What is the momentum of an automobile (weight = 9600 N) when it is moving at 38 m/s to the south?

    asked by opp
  153. math

    A boat is rowed down a river a distance of 16 miles in 2 hours and it is rowed upstream the same distance in 8 hours. Let r represent the rate of the boat in still water in miles per hour, and let c represent the rate of the stream in miles per hour. Write

    asked by lea
  154. p

    A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted, the remaining nucleus is thorium (mass 234 u). If the alpha particle is moving at 0.052 the speed of light, what is the recoil

    asked by opp
  155. math

    The average airspeed of a single-engine aircraft is 150 milesper hour. If the aircraft flew the same distance in two hours with the wind as it flew in 3 hours against the wind, what was the effect of the wind on the plane? What are the equations? What is

    asked by lea
  156. math

    The measure of one angle is 15 degrees more than half the measure of its complement. Find the measure of the two angles.

    asked by lea
  157. chemistry

    how to change mg/mL into mmol/L?

    asked by JENNY
  158. Physics (PLEASE HELP)

    Two slits are 0.144 mm apart. A mixture of red light (wavelength = 665 nm) and yellow-green light (wavelength = 565 nm) falls on the slits. A flat observation screen is located 2.11 m away. What is the distance on the screen between the third-order red

    asked by DCM
  159. p3

    A block of wood of mass 0.86 kg is initially at rest. A bullet of mass 0.048 kg traveling at 102.3 m/s strikes the block and becomes embedded in it. With what speed do the block of wood and the bullet move just after the collision?

    asked by opp
  160. math

    The measure of one angle is 30 degrees less than one-third the measure of its supplement. Find the two angles.

    asked by lea
  161. English

    Can you have a look at these sentences, please? 1. I’m emailing you the list of students, who are looking forward to starting the email partnership. As you can see, there are 25 pupils, coming from different classes and age groups. Do you think you can

    asked by Matthew
  162. Chemistry

    Given PV=nRT and the following equation: CH4+2O2=CO2+2H2O Calculate the maximum number of ML of CO2 at 750 torr and 295.15 degrees K that can be formed from above conbution of methane ( CH4 ) if 450 mL of methane at 705 torr and 283.15 degrees K are mixed

    asked by Chantel
  163. algebra 1

    if d=m/v,find the value of d if m=48 and v=6

    asked by myeshia
  164. Chemistry

    What is the number of bonding electrons and the number of nonbonding electrons in the structure of BeF2?

    asked by Liz
  165. Accounting

    §179 expense is available for all of the following business assets except: A. a bulldozer. B. a phone system. C. an apartment complex. D. office furniture. is it A

    asked by Andy
  166. math

    a blue box has 5 times as many marbles as a red box. the blue box has 24 more marbles than the red box. how many marbles are in each box?

    asked by Gabbie
  167. chemistry

    A 12.0g sample of carbohydrate contain 4.50g of carbon, 3.25g of oxygen, and some hydrogen. Determine the percent by mass of hydrogen in your product.

    asked by puraw
  168. english

    Identify the capitalized part of speech in the following sentence: You should be proud of him, FOR he's a "jolly good fellow." Answer a. noun b. pronoun c. verb d. adjective e. adverb f. preposition g. conjunction .

    asked by david
  169. english

    Identify the capitalized part of speech in the following sentence: Sterling has volunteered FOR an organization that helps the homeless. Answer a. noun b. pronoun c. verb d. adjective e. adverb f. preposition

    asked by treena
  170. english

    Identify the underlined part of speech in the following sentence: Unless you come to class and complete the work, you will learn very little. Answer a. noun b. pronoun c. verb d. adjective e. adverb f. preposition g. conjunction

    asked by tymeesha
  171. Math

    Two numbers have a product of 3 1/5 and a sum of 3 3/5. One of the numbers is a whole number. Find the numbers.

    asked by Laura
  172. english

    Hi, I have to compare Crossing Brooklyn Ferry by Walt Whitman to modern day time. The last couple of journal entries I've compared to well known songs and their lyrics. I'm thinking of comparing it to an important event or movie, but I'm not sure what to

    asked by jon
  173. Pre-calc

    use either substitution or elimination 4/x-3/y=0 4y=3x

    asked by Jennifer
  174. Science

    How many grams of barium carbonate can be produced from mixing 100.0 mL of 0.20M barium nitrate and 50.0 mL of 0.30M potassium carbonate?

    asked by Mallory
  175. English {ASAP}

    Mrs.Frisby and the Rats of NIMH 1. Write from Mrs.Frisby's point of view your thought upon hearing the tractor start. Then write about the same thing from Mr.Fitzgibbon's point of view.

    asked by Sharis
  176. Understanding psychology eighth edition

    verbal skills and muscular coordination have been observed to impruove women when

    asked by Tiffany
  177. math-factoring

    how to factor when there is not a 1 as a coefficient.. for example 2x^2-x-5

    asked by Veronica
  178. programming

    Your goal for this project is to write an unsigned 16-bit software implementation of both the multiplier and the divider architectures found in the book. Input/Output You are required to read two unsigned integers from the console. The valid range for both

    asked by MIPS HELP........SIMPLE PROGRAM
  179. Chemistry(Urgent, please respond, thanks!!)

    1) For the reaction system, 2 SO2(g) + O2(g) = 2 SO3(g), Kc has a value of 4.62 at 450.0 K (Kelvin). A system, at equilibrium has the following concentrations: (SO3) = 0.254 M; (O2) = 0.00855 M. What is the equilibrium concentration of SO2? Is set this up

    asked by Hannah
  180. Physics

    tarzan has a mass of 100 kg and is 200m above the group and wants to slide down a nearby vine. the vine can only hold 400n without breaking. assuming he starts from rest and moves with a constant acceleration what is the longest time it can take for Tarzan

    asked by Ariel
  181. Chemistry(Please check answer)

    The equilibrium constant for the reaction, H2(g) + I2(g) == 2 HI(g) is 54.9 at 699.0 K (Kelvin). What is the equilibrium constant for 4 HI(g) == 2 H2(g) + 2 I2(g) under the same conditions? Note: the == indicates the equilibrium double arrow Since the

    asked by Hannah
  182. chemistry

    What mass of sulfur msut be used to produce 17.1 L of gaseous sulfur dioxide at STP according to the following equation? S8 (s) + 8O2 (g) -> 8 SO2 (g) Answer in units of g

    asked by Sarah
  183. chemistry

    How can a liquid, soda, contain a gas, carbon dioxide?

    asked by carla
  184. Algebra

    C(squared)+3c+1=0

    asked by Payton
  185. College Physics

    A bowling ball (mass = 4.4 kg, radius = 0.11 m) and a billiard ball (mass = 0.35 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other? What equation should I

    asked by Anonymous
  186. Chem Help PLEASE!

    Asked earlier but got no reply :/ hopefully I get one now cause I'm really stuck and can't completely my assignment cause of one question.. How many grams of dry NH4Cl need to be added to 1.90 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer

    asked by Taylor
  187. College Physics - Weight

    A planet has a mass of 7.93 × 1023 kg and a radius of 2.58 × 106 m. (a) What is the acceleration due to gravity on this planet? (b) How much would a 67.0-kg person weigh on this planet?

    asked by Anonymous
  188. english

    Identify the capitalized part of speech in the following sentence: Unless you come to class and complete the work, you will learn VERY little. Answer a. noun b. pronoun c. verb d. adjective e. adverb f. preposition g. conjunction .

    asked by toney
  189. english

    What is the subject for the following sentence? The first assignment for this class is this quiz. Answer a. first b. assignment c. class d. quiz .

    asked by toney
  190. College Physics - Speed

    Traveling at a speed of 15.6 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.730. What is the speed of the automobile after 1.25 s have elapsed?

    asked by Anonymous
  191. Chemistry(Please help, thank you!)

    Using this data, 2 NO(g) + Cl2(g) == 2 NOCl(g) Kc = 3.20 X 10-3 NO2(g) == NO(g) + ½ O2(g) Kc = 3.93 calculate a value for Kc for the reaction, NOCl (g) + ½ O2 (g) == NO2 (g) + ½ Cl2 (g) I do not understnad how I am suppose to use the Kc values given if

    asked by Hannah
  192. College Physics - Acceleration

    A 1470-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16070 N on the sub, as well as a downward resistive force of 1050 N. What is the submarine's acceleration?

    asked by Anonymous
  193. geometry

    Find "a" to the nearest tenth if a= 36° and c=13.5

    asked by Stacey
  194. english (please answer soon)

    Hi, I have to compare Crossing Brooklyn Ferry by Walt Whitman to modern day time. The last couple of journal entries I've compared to well known songs and their lyrics. I'm thinking of comparing it to an important event or movie, but I'm not sure what to

    asked by jon
  195. Chemistry(Please help, thank you!)

    A study of the system, H2(g) + I2(g) == 2 HI(g), was carried out. Kc = 54.9 at 699.0 K (Kelvin) for this reaction. A system was charged with 2.50 moles of HI in a 5.00 liter vessel as the only component initially. The system was brought up to 699.0 K and

    asked by Hannah
  196. Algebra 2

    Find all numbers that must be excluded from the domain of the given rational expression. 1) x^2+4x/x^2-16 2) 6x^3y-6xy/x^3+5x^2+4x 3) 4-x^2/x^2+x-6

    asked by Gabby
  197. math

    3 1/2 cups plus 2 1/3 cups of flour

    asked by Anonymous
  198. physics

    A 78 cm long, 0.8 mm diameter steel guitar string must be tightened to a tension of 1600 N by turning the tuning screws. By how much is the string stretched?

    asked by Kristen
  199. Chemistry(Please help)

    For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction? Kp would = CaCO3/(CaO)(CO2) I do not know what to do with the 0.500M

    asked by Hannah
  200. math

    A student says that a 98% angle has a complement Explain why this is incorrect?

    asked by Tania
  201. Finance

    Is leasing a building equivalent to having a company finance a project's construction via a long-term book?

    asked by Wilbert
  202. RES/341

    what are some commonly researched areas in business?

    asked by anita
  203. Chemistry(Please help)

    For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction

    asked by Hannah
  204. political science

    An important reason for why public policy and public opinion may not coincide in the United States is that... a) the American system of government includes arrangements, such as an appointed judiciary, which may produce policy decisions that run contraty

    asked by tina
  205. Political Science

    True or False Calling randomly selected phone numbers is the main method pollsters use to gather a random sample.

    asked by tina
  206. political Science

    Whice statement about public opinion polls is NOT True? a) in modern election campaigns, politicians have almost never used public opinion polls. b) politicians use polls in order to help them make decisions about whether to run for office, what policies

    asked by tina
  207. english

    i just need some checking on my sentences if there is something wrong. thank you Ranchers and farmers are competitively trying to reduce their cost in many ways. This strategy reduces the quality of the product which brings problem to the food. Each year,

    asked by kuno
  208. math

    a baseball is hit with an initial velocity of 75 feet per second from the height of 3 feet. The function h(t)=-16t squared + 75t + 3 models the path of the baseball where t represents the time in seconds that the ball has been traveling and h represents

    asked by fee
  209. Chemistry(Please respond)

    I did an experiment to study the effects of changes in conditions on an equilibrium system. The first system was the dissociation of acetic acid. HC2H3O2 -> H^+^ + C2H3O2^-^

    asked by Hannah
  210. Chemistry

    How many mL of 3.00M HNO3 would you need to make exactly 100mL of 0.83 HNO3 by dilution with water? (The FM of HNO3 = 63.0.)

    asked by Lauren
  211. calculus

    The velocity of a car is given by v(t)= 20(x+sin(x)0 miles per hour. a. how far does the car travel between t=1 and t=3.2 hours?

    asked by Ilyas
  212. english

    How would I correct the following sentence, I don't know if I have to put quotes for the poem or the movie: As I was reading Crossing Brooklyn Ferry, I noticed parallels between it and the movie Finding Nemo.

    asked by jon
  213. Chemistry

    A chemist mixes aqueous sodium bromide and aqueous lead (II) nitrate. Predict the product(s) of the reaction.

    asked by Ashley
  214. Chemistry

    Predict the products when a chemist mixes an aqueous sodium chloride solution with an aqueous calcium nitrate solution.

    asked by Ashley
  215. physics

    What is constant acceleration?

    asked by Anonymous
  216. Algebra! 20 yrs. out of school

    a. 1/2 times 1/3 b. 3/4 times 1/3

    asked by Mary
  217. english

    Hi I'm back again, how does this sentence sound: Both delve into issues regarding the search for one’s identity and fitting in among society while maintaining a sense of individuality.

    asked by jon
  218. Related rate

    Use differentials to find the approximate change in the surface area when the radius of the sphere is increased from 10cm to 10.2cm. I know A=4pir^2 and A' is 8pir but I'm not sure how to set it up from here. Can someone please show me all the steps

    asked by Kim
  219. math

    ht tp://ww w.you tube.c om/watch?v=xjV HHE22r3I

    asked by smith
  220. math

    prove the identity : cos^4 theta- sin ^4 thetaover sin squared theta cos squared theta =cot squared theta - tan squared theta

    asked by Haley
  221. Chemistry - Please Check!

    Determine the mass of zinc sulphide, ZnS, produced when 6.2g of zinc and 4.5g of sulphur are reacted. Equation given: Zn + S8 >> ZnS Balanced equation: 8Zn + S8 >> 8ZnS nZn= 6.2 g/ (65.39 g/mol) = 0.095 mol nS8= 4.5 g/(256.48 g/mol) = 0.018 mol nS8 = 0.095

    asked by Hannah
  222. CHEM

    Pu-239 has a half-life of 24110 y. If 1.00 kg of this isotope is present in the used fuel rods of a nuclear power plant approximately how long will it take for this amount of Pu-239 to decay until there is less than 1 mg left ? Please help. I do not know

    asked by ARIANA
  223. Chemistry

    how do i calculate the temperature in Celsius of a 3.50L,0.75 mole sample of ammonia at 1.0 atm of pressure

    asked by Jerrad
  224. math- Variance

    What does it mean when it says Variance of Stride Length with Speed?? Do you add the Variance of both individually together?

    asked by Emily
  225. Psychology

    My hypothesis is whether or not music with violent overtones, such as "gangsta rap", increases violent behavior among young males. Which of the methods used for analyzing survey data would you use and why? Correalational or Regressional statistical

    asked by Sharon
  226. Chemistry

    What is the electron configuration for the transition metal ion(s) in each of the following compounds? Na2[TaF7] Cant seem to figure this one out...

    asked by Sarah
  227. finite math

    what is the cost to install new carpet in an 15' by 21' room if the price of the carpet including installation is $14.50 a square yard?

    asked by rita
  228. calculus

    Use Euler's method with step size 0.2 to estimate y(1), where y(x) is the solution of the initial-value problem. y' = 5x + y^2, y(0)=-1.

    asked by Carlton
  229. CHEMISTRY

    Calculate ΔSfus and ΔSvap for HF. Determine the entropy change when 7.60 mol of HF(l) freezes at atmospheric pressure. I already calculated ΔSfus as 24.103 J/k*mol and ΔSvap as 86.07 J/K*mol....These are correct (I checked them already). I need help

    asked by Brian
  230. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 288.9 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What

    asked by Jerry
  231. Chemistry

    A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which

    asked by Jerry
  232. math

    A child 4 feet tall casts a shadow 6 feet long. A nearby tree casts a shadow 27 feet long. How tall is the tree?

    asked by susan
  233. English

    Identify the Direct Object in the sentence. 9. Nevertheless, they know the long distance traveled by the accomplished athletes. My answer: distance

    asked by Anonymous