Questions Asked on
May 31, 2013

  1. Chemistry

    What is the half-life of sodium-24? Explain how you determined your answer. Sodium-24 decays by beta emission. Write a nuclear equation that shows the decay of sodium-24 and its products.

    asked by Help plz....Chloe
  2. Statistic

    At one college, GPA's are normally distributed with a mean of 2.7 and a standard deviation of 0.5. What percentage of students at the college have a GPA between 2.2 and 3.2?

    asked by Irene
  3. math HELP

    The probability of a basketball player hitting a foul shot is one-third. How many shots would you expect her to make in 90 attempts?

    asked by bilbo
  4. pharmacy technician

    2% testosterone qs ad petroleum jelly 240g. How many ml of testosterone is needed to make this compound?

    asked by Debra
  5. chemistry

    Sulfuryl chloride, SO2Cl2, decomposes to SO2 and Cl2 according to the reaction SO2Cl2(g) -> SO2(g) + Cl2(g) The reaction is first order in SO2Cl2, and the value of the rate constant, k, is 2.20*10-5 /s at 300K. (a) Calculate the intial rate of reaction

    asked by ssss
  6. math

    What is the excluded value of a/b-2

    asked by Anonymous
  7. Science-Chemistry

    1. What is Charles’s law? • State the definition of the law in words. • What are the assumptions of Charles’s law? • Write mathematical equations that represent the law. • What can you do with Charles’s law? • Using a gas-filled balloon as

    asked by Help needed.... Danielle
  8. language arts help please

    1. Which of the following is an example of an acronym? FAQ Mrs. Ave. won't 2. The original meaning of the word awesome is "inspiring great admiration or fear." Which of the following is the best synonym of the word s it is used most commonly today? great

    asked by Delilah
  9. Chemistry

    Sodium Azide, (NaN3), the conjugate base of hydrazoic acid, is sometimes added to water to kill bacteria. Given a 0.010 M solution of sodium azide, A) What is the [H+] concentration from the Azide base rxn? B) Given a 0.01 M NH4+, what is the [H+]? C) What

    asked by Lovey dovey
  10. chemistry

    Help plzzz Besides the major types of radioactive decay, there are two others: positron emission and electron capture. • Compare and contrast positrons with electrons. • Explain how positron emission works and how it causes transmutations. • Explain

    asked by Help!!! Maddie
  11. math

    The amount to which $5,000 would grow in ten years at 6% compounded semiannually.

    asked by Lilly
  12. Literature

    How does Kurt Vonnegut address the concept of equality differently in “Harrison Bergeron” than Martin Luther King Jr. does in “Letter from Birmingham Jail”? What relationship does Vonnegut’s story show between equality and personal

    asked by Charlie
  13. physical education

    What nutritional supplement is recommended for helping the body handle stress? A. Zinc B. Iron C. Vitamin C D. No supplements are recommended for stress management I think its a but im not sue please help

    asked by selena
  14. Math

    Sixty men working on a construction job have done 1/3 of the work in 18 days. The project is behind schedule and must be accomplished in the next twelve days. How many more workers need to be hired?

    asked by Shin
  15. Chemistry

    Hi, I am stuck on this question and would appreciate some guidance. The question states " The value of Kw decreases as the temperature decreases. Is the auto-ionization of water an exothermic or endothermic reaction in the forward direction?" I feel like

    asked by Charlotte
  16. Physics

    Which of the following is the correct relationship between the electric field strength and the potential difference?

    asked by tanya
  17. chemistry

    The skeletal structures of the two amino acids, glycine and lysine, are given below along with the values of the relevant acid dissociation constants (pKa). (b) Calculate the pI (isoelectric point) of the dipeptide, Lys-Gly, assuming that there is

    asked by bonjo
  18. American history

    Which of the following best describes the columbian exchange that occurred during the age of discovery

    asked by Annette
  19. Chemistry

    Calculate the pI (isoelectric point) of the dipeptide, Lys-Gly, assuming that there is negligible shift in the values of acid dissociation constants from the values of the constituent amino acids. Gly pkA 9.87 an pka 2.35; Lys pka 9.18, 2.16 y 10.79

    asked by guegue
  20. Physics

    when a wire of length 5m & radius 0.5mm is stretched by a load of 49N the elongation produced in the wire is 0.1cm find the energy stored per unit volume of the wire?

    asked by Sonal
  21. PHL458

    Don't really understand what the teacher want. Can you help me get a better understanding. Evaluating and Refining Resolutions Presentation (Preparation) Search for societal issues and pick one issue you would like to resolve. Obtain faculty approval of

    asked by cathy
  22. Physics

    Which of the following is correct for a step-down transformer?

    asked by april
  23. Algebra 1

    1) Find the possible values of a, if the distance between the points is 5, and the coordinates are (1, 1) and (4, a). I don't know how to solve this one. 2) in a right triangle the length of the hypotenuse is 14 and the length b of one of the legs is 8.

    asked by Eri
  24. math

    You have two job offers on the table. The first job you will earn a weekly salary of $14 per hour. The second job offers you $7 per hour plus 30% commission. Explain how you would decide which job to take. What would be the deciding factor? Explain to your

    asked by Santina
  25. maths

    an elevator descends at the rate of 8m/min.if the descent starts from 5m above the ground level,how much time will it take to reach -475m ?

    asked by kundavai.u
  26. Chemistry

    Describe the subatomic structure of the nucleus, including the structure of each nucleon. Describe the forces that hold the nucleus together Explain how beta emission works.

    asked by Maria
  27. physics

    a trailer is pulling acar with a force of 900N on a level road. The car is moving at 70km/h, how much work is done by the trailer on the car in 15mm?

    asked by taiwo
  28. Calculus

    Evaluate the following limit, if it exists: lim h-->0 ((sqrt9+h)-3/(h)

    asked by Tyler
  29. math

    15. You are the buyer for The Shoe Outlet. You are looking for a line of men’s shoes to retail for $79.95. If your objective is a 55% markup based on selling price, what is the most that you can pay for the shoes and still get the desired markup

    asked by kim
  30. Calculus

    If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, its height in feet after t seconds is given by f(t)=95t−16t^2 Find the average velocity for the time period beginning when t=1 and lasting (i) 0.5 seconds (ii) 0.1 seconds

    asked by Abby
  31. Physics

    Which of the following is correct for the two coherent light waves to produce zero light?

    asked by Janet
  32. algebra

    You are shopping for an executive desk chair at The Furniture Gallery. You see two you like on sale. Chair A was originally $119.99 now on sale for $79.99 and Chair B was originally $149.99 now on sale for $89.99. Calculate the markdown percent of each

    asked by trish
  33. math

    A. Wyatt’s Western Wear purchases shirts for $47.50 each. A $34.00 markup is added to the shirts. What is the selling price? B.What is the percent markup based on cost for the shirts in the previous question? (Round percent to the nearest tenth.)

    asked by TISHA
  34. math

    A. . Epicure Market prepares fresh gourmet entrees each day. On Wednesday, 80 baked chicken dinners were made at a cost of $3.50 each. A 10% spoilage rate is anticipated. At what price should the dinners be sold to achieve a 60% markup based on selling

    asked by Lamar
  35. physics

    A rock is suspended by a light string. When the rock is in air, the tension in the string is 43.8 . When the rock is totally immersed in water, the tension is 26.2 . When the rock is totally immersed in an unknown liquid, the tension is 18.8 .

    asked by lungani
  36. Maths

    Prove that (2n)!/n!=1x3x5.........(2-1)x2n.

    asked by Sonal
  37. chemisrty

    The N-N bond energy is difficult to measure. Given the values of 190 kJ/mol for the N-Cl bond energy and 240 kJ/mol for the Cl-Cl bond energy, determine the maximum de Broglie wavelength of an electron capable of breaking the N-N bond.

    asked by Anonymous
  38. English

    Which is the better strategy for reading comprehension?

    asked by Lulu
  39. physics

    A large truck (m=3300kg) accelerates from 15 m/s. Neglecting any friction or air resistance, find the average mechanical power that the trucks engine must supply.

    asked by Stacy
  40. Calculus

    If a ball is thrown straight up into the air with an initial velocity of 95 ft/s, its height in feet after t seconds is given by f(t)=95t−16t^2 Find the average velocity for the time period beginning when t=1 and lasting (i) 0.5 seconds (ii) 0.1 seconds

    asked by Robin
  41. chemistry

    Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2.

    asked by Anonymous
  42. Discrete Math

    True or False? Homogeneous linear recurrence equations are linear combinations of power functions. I think the answer is false because although a homogeneous linear recurrence equation is a linear combination, it is composed of constant coefficients.

    asked by Sarah
  43. chemistry

    the skeletal structures of two amino acids.

    asked by himani.
  44. math

    Tickets to a show cost $10 for adults and $5 for children. The show was sold out, and the theatre has 500 seats. If the revenue collected from these ticket sales was $2900, how many adult tickets were sold?

    asked by ray
  45. MIT 2.01x

    The thin wall shaft is fixed at and loaded by concentrated torques at sections and of direction and magnitude indicated in the figure. The shaft is composed of three segments, and of equal lengths m, and diameters indicated in the figure. The three

    asked by Anonymous
  46. Phyics please help ms sue

    A 9 v battery is connected across a series combination of 100 W, 35 W, and 55 W resistors. The current measured in the circuit is 100 mA. What can be wrong in this circuit?

    asked by Anonymous
  47. Vectors

    A 10-kg mass is suspended by two strings of length 5m and 7m attached to two points in the ceiling 10 m apart. Determine the tension on each string. Round your result to one decimal place (include a vector and position diagrams)

    asked by samantha
  48. statistics

    The lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than

    asked by Anonymous
  49. chemistry

    I want to replace 5g per liter of nah2po4 .h2o with h3po4 at 85%. the liquid is 1.685 g/ml

    asked by sue
  50. math

    The Flour Power Bakery makes 200 cherry cheesecakes at a cost of $2.45 each. If a spoilage rate of 5% is anticipated, at what price should the cakes be sold to achieve a 40% markup based on cost?

    asked by brenda
  51. MIT2.01x

    We will use moment equilibrium around the x axis to calculate the x-component of the reaction torque at and the axial torque resultant at section , for these two shafts in torsion.

    asked by Anonymous
  52. physics Elena please verify

    If the resistance between the center and the outer terminal on a 20 k ohm potentiometer reads 12 k ohms, the resistance between the center terminal and the other outer terminal is i have 12kohms

    asked by Adam
  53. chemistry

    For each pair of substances listed below, identify the one with the lower boiling point. (a) Silane (SiH4) and Phosphine (PH3) answer = silane (b) Ammonia (NH3) and Phosphine (PH3) answer = phosphine (c) Lithium fluoride (LiF) and Hydrogen Fluoride (HF)

    asked by barco
  54. Physics

    A tunable capacitor (with variable capacitance) is charged by a U0=12 V battery and then is connected in parallel to a R=3 Ω resistor. The capacitance C(t) of the capacitor is controlled so that the current in the circuit remains constant at all times.

    asked by Mathslover
  55. Calculus

    Find all first partial derivatives: f(x,y)=e^(xy)cosx

    asked by Elyse
  56. math

    A. You are shopping for an executive desk chair at The Furniture Gallery. You see two you like on sale. Chair A was originally $119.99 now on sale for $79.99 and Chair B was originally $149.99 now on sale for $89.99. Calculate the markdown percent of each

    asked by Lamar
  57. chemistry

    what kind of hybridization exists for each carbon in the lattice?

    asked by himani.
  58. math

    A poll of 100 students was taken at a no-residential college to find out how they got to campus. The results were as follows: 28 said car pools;31 said buses;and 42 said they drove to school in their own car alone. In addition, 9 used both car pools and

    asked by ray
  59. SAT math

    I've really been stuck on these questions: 1. If ( x + 2 y )= -4 and am = 6, then 2amx + 4amy = ____ ? 2. The integers x and y are such that x > y > 0 and x 2 - y 2 = 31. If x – y = 1, what is the value of x + y ? 3. What is the value of a that will make

    asked by mysterychicken
  60. chemistry

    A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2

    asked by Anonymous
  61. physics please need help

    If the period of an AC sine wave is 180 ms, the frequency is

    asked by Adam
  62. SAT math

    1. Find the product of the solutions of this equation: 1 / x+1 - 6-x/6x = 0 2. If y is jointly proportional to x and z and y = 4 when x = 8 and z = 1, what is the value of y when x = 24 and z = 3? For this one I think I'm solving it wrong, because I keep

    asked by mysterychicken
  63. Chemistry

    What is the volume of a sample of helium that has a mass of 5.13x10^-3 and a density of 0.17847g/L

    asked by Addie
  64. english literature

    How does The Misfit embody both verses of Matthew 12:35? "A good man from the goodness of his good heart brings forth good things; an evil man from the evilness of his evil heart brings forth evil deeds."

    asked by joanna
  65. Math

    Can someone help me with this I figured out a similar problem P(x) = xsquare+5 over 50 for x = 1 got 0.12 But having problems on how to plug the numbers into this problem. you don't have to use these numbers but if someone could do an example for me I

    asked by Nora 5
  66. Aviation

    Does the engine of a Cessna 162 have an alternate air source? How many fuel pumps does the Cessna 162 have? Your help is very much appreciated!

    asked by Heather
  67. Physics

    Can anyone write a mathematical equation to represent Charles law?

    asked by Schylar
  68. heeeeeeeelp math

    Let x,y,z be non-negative real numbers satisfying the condition x+y+z=1 . The maximum possible value of x^3*y^3+y^3*z^3+z^3*x^3 has the form a/b where a and b are positive, coprime integers. What is the value of a+b ?

    asked by andrew
  69. physics

    an electron with velocity v=3x10 to the power 7 m/s describes a circular path in a uniform magnetic field of 0.2T perpendicular to it calculate the radius of the path?

    asked by Sonal
  70. physics

    describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump

    asked by Tanaka Mufuvi
  71. Maths

    prove that the equation of straight line which passes through the point (a cos^3a, sin^3a) & is perpendicular to the straight line x sec a+y cosec a=0 is x cos a-y sin a = a cos 2a.

    asked by Sonal
  72. Chemistry

    entropy is not a good criteria for determining the spontanecity of a process.give reason.

    asked by Sonal
  73. chemistry

    sulfuryl cholorie decomposes toSo2 and cl2

    asked by himani.
  74. chemistry

    calculate surface energy of 100 plane of niobium.

    asked by himani.
  75. chemistry

    a pressure vessel contains a large volume of cn2 gas at 10atm pressure.

    asked by himani.
  76. chemistry

    you have 333 ml of alkaline solution at pH=11.1

    asked by himani.
  77. math

    The mean attendance of spectators at ball games is 120, the median is 125...what is the total attendance in 20 games?

    asked by Debbie
  78. Chemistry

    What is the approximate ratio in conductivity of silicon doped with 37 ppm to silicon doped with 5 ppm?

    asked by zzzz
  79. Calculus

    A helium balloon rises vertically at 3.5m/s as the wind carries it horizontally at 5.0m/s. What is the resultant velocity of the balloon?

    asked by Alice
  80. math

    If a - b , a , a + b are zeros of polynomial x3-3x2 + x + 1 the value of(a+b) is:

    asked by sapna
  81. Chemistry

    What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding

    asked by jo
  82. math

    how do I set up this problem. John has bag of candy, gives 1/2 to his brother and 1/3 of remaining to his sister and has 15 left? how many did he start with?

    asked by george
  83. Mathematics Ms Sue help

    A high pass filter with a cutoff frequency of 250 kHz is placed in a circuit after a low pass filter with a cutoff frequency of 150 kHz. Together, these filters create which type of filter?

    asked by Adam
  84. Chemistry

    I don't understand this question, thanks to whoever tries to help!! (This homework question was removed due to a copyright claim submitted by k12.com.)

    asked by So confusing.. Anyone help??? Kylie
  85. Law

    __________ is an act declared by statute to be a crime because it violates the standards of behavior expected of children. A. Delinquency B. Vandalism C. Violating curfew D. A status offense is it A

    asked by Amy
  86. Math (Please help ASAP?)

    I have this weird question that has to do with linear equations (I think), and this is what it says. Let f(x) = 4x - 5 A. Find f(3) B. Find x when f(x) = -21 Can somebody help me understand this??

    asked by Alan
  87. SAT math

    1. x^2 + 4x + 1 = 0 has how many solutions? 2? 2. What is the greatest common factor of the polynomial 8y + 2x^3 y^2 - 2y^3? 2y? 3. The product of powers rule states that for any number a, and integers q and p, (a^q)(a^p)=a^q+p True 4. True or False: The

    asked by mysterychicken
  88. physics

    the speed of 90 hm/hr is equal to.... m/s

    asked by arowosafe
  89. physics

    the speed of 90 hm/hr is equal to.... m/s

    asked by arowosafe
  90. SAT math

    1. True or False: The y -intercept of the linear equation x – y = 4 is (0, 4). False?...I think its -4 2. If 10 a > 17, then 30 a + 2 > ____ ? 53? 3. Which of the points below will satisfy the given system of inequalities? 2y>-2 and 15x

    asked by mysterychicken
  91. math

    looking for the pattern in these sequences: -2,0,1,4,4,8,_ , _ , _, _, and so forth

    asked by ray
  92. math

    A graph is given with the line going from (-2, 2) to (2,8). a) Find the length of this line. b) Find the midpoint of the line. c) write an equation for this line. my answers- a) 2√10 b) 0,5 c) y = 1.5x + 5 please check these answers.

    asked by Anonymous
  93. chemistry

    You have 333 mL of alkaline solution at pH = 11.1. You wish to neutralize this by reacting it with 222 mL of acid. What must be the value of the pH of the acid?

    asked by barco
  94. Math

    A house mouse has a mass of 12 grams. If you put a mouse on a scale, how many paper clips would be needed to balance it if a paper clip has a mass of 12 grams?

    asked by Anonymous
  95. language arts

    1. Where should you put one or more hyphens in the following sentence? The cake was freshly baked and was an irresistible temptation for my four year old cousin. between "freshly" and "baked" between "irresistible" and "temptation" between "four" and

    asked by Delilah
  96. Biology

    How does the structure of Earth’s interior affect seismic waves?

    asked by ale
  97. Calculus

    If 2x-2¡Üf(x)¡Üx^2-2x+2, determine limx-->2f(x)= (Use squeeze theorem)

    asked by Penny
  98. english

    “I always wear my lucky hat when the Atlanta Braves play; thanks to me, they won the World Series!” This is an example of (Points : 1)

    asked by Anonymous
  99. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you

    asked by K
  100. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you

    asked by K
  101. PHL458

    Please!!!! He really confuse me now. Your project is approved. Submit it informally to the Assignments forum ('informally' means with a Cover page and then a request with the statement of the topic.

    asked by cathy
  102. English

    what does it mean to follow in someones footsteps exceedingly?

    asked by katie
  103. chemistry

    a comparision of density value bx x-ray reveals that % of Al are 0.07% at 923 K and 0.009% at 757 K

    asked by himani.
  104. Citing

    In Chicago, when you are citing two things from the same source how do you cite it?

    asked by emma
  105. physical education

    is too much exersise and sports training without any rest good for health?

    asked by kundavai.u
  106. language

    what is for thankyou in korean

    asked by kundavai.u
  107. art

    According to the lesson, most African art was created for all of these purposes EXCEPT:

    asked by Anonymous
  108. chemistry

    a pressure vessel

    asked by himani.
  109. math

    looking for the pattern in these sequences: -2,-1,4,1,4,9,14,27,_,_,_,_

    asked by ray
  110. chemistry

    for each pair of substance listed below identify one with lower boiling point

    asked by himani.
  111. chemistry

    for each pair of structure shown below indicate two species are identical molecules.

    asked by himani.
  112. chemistry

    diffraction from an unknown cubic metal is observed to occur at following value using cu radiation.

    asked by himani.
  113. english

    I think that rainy days are just awful, is this suitable to form the basis of a single persuasive paragraph.

    asked by michael
  114. Geometry

    given 18 feet of fencing what is the largest area that you can enclose with the fencing.

    asked by Tahirah
  115. Geometry

    given 18 feet of fencing what is the largest area that you can enclose with the fencing.

    asked by Tahirah
  116. SCI/220 HUMAN NUTRITION

    I would like a thesis, and a general answer to the questions

    asked by Fertina
  117. english

    Im doing a 8 paragraph project report on cherokee indians, i need a introduction, final draft, six body paragraphs and a conclusion for a total 8 paragraphs please help me it due the 12

    asked by jesse
  118. Finance

    What does "loan amortization requirements" mean?

    asked by K
  119. SAT math

    True or False: The least common denominator of each denominator in the following rational expression is -2(x-3)(x-1) : 8 / x^2-4x+3 = 1 / 3-x + 1 / 2 FALSE? True or False: The least common denominator of each denominator in the following rational

    asked by mysterychicken
  120. SAT math

    1. If square root of 3x-11 +10 = 17, find the value of 10 x . I don't know how to solve with square roots. I subtracted 10 from both sides, so I'm left with square root of 3x-11 = 7...How do I solve for x?

    asked by mysterychicken
  121. Math Linear function help?

    How do you write an equation of a line in slope intercept form if two points are given? Ex. Say you were given the points (0,6) and (4,3)? What would you do?

    asked by Lily
  122. geometry

    how to solve angle D is 90 degrees and angle E is 25 degrees side DE is 8 cm and side DF is 6 cm what is side ED

    asked by carlos
  123. More math linear equation help?

    I'm looking at this graph where I see a line AB with the points (-2,2) and (2,8). Then I have to do the following: a) Find the length of AB b) Find the midpoint of AB c) Write an equation for the line going through AB I don't understand how to do part a

    asked by Lily
  124. physics please need help

    A parallel RL circuit has a reactance of 250 W and a resistance of 125 W. The phase angle of the circuit impedance is

    asked by Adam
  125. Phyics help please varify the answer is correct

    A parallel circuit has value of RT = R1 // R2 // R3. If one resistor opens, RT RT increases?

    asked by Adam
  126. math

    ___% of 3.75 =2

    asked by larry
  127. Law

    1. Many social scientists argue in favor of diversion programs because: A. they are sociologically effective, even though they do not reduce court backlog. B. they increase the costs of criminal processing, but are worth it in the long run. C. although the

    asked by Amy
  128. math linear equations

    would the equation in slope-intercept form of the line which passes through 0,6 and 4,3 be y = -3/4x + 6?

    asked by Anonymous
  129. SAT Math

    True or False: The least common denominator of each denominator in the following rational expression is (z-4)(z+4)(z-1)(z+1): 8 / z^2+5z+4 = 1 / z-4 + 1 / z-1 I am stuck on this one...

    asked by mysterychicken