Posts by Elena

Total # Posts: 4,391

  1. Science

    Match the question with the correct conversion factor needed. Column A 1.What is the mass, in grams, of a single atom of carbon?: 2.What is the mass, in grams, of a single atom of iron?: 3.What is the mass, in grams, of a single molecule of water?: 4.What is the mass, in grams...
  2. Science

    What mass of sodium has the same number of atoms as 50.0 g of calcium?
  3. Math

    One fourth of a watermelon is divided among three friends what fraction of the whole watermelon will each person get
  4. Physics

    KE = W(fr)+PE KE = mv²/2 W(fr) =F •d=?N•d= ?mg•cos?•d PE=mgh=mg•d•sin? mv²/2 = ?mg•cos?•d+ mg•d•sin? d=v²/2g(?•cos?+sin?) = = 6²/2•9.8(0.25•0.241+0.259) = 3.67 m
  5. math

    In triangle wxy, wy is congruent to xy. the perimeter of triangle wxy is 76 inches. how many inches long is wx?
  6. Algebra 1

    Which statement best demonstrates why the following is a non-example of a polynomial? 33/16 - 62y^2xz-35z^1/3y^2 a. The expression has a variable raised to a negative exponent. b. The expression has a variable in the denominator of a fraction. ** c. The expression has a ...
  7. Algebra I math

    Which statement best demonstrates why the following is a non-example of a polynomial? 33/16 - 62y^2xz-35z^1/3y^2 a. The expression has a variable raised to a negative exponent. b. The expression has a variable in the denominator of a fraction. c. The expression has a negative ...
  8. math

    40
  9. Language Arts

    Un DER a SPREAD ing chest NUT tree
  10. Language Arts

    Okay, so what I think it is is: UNder A chestNUT tree, but I'm most likely wrong
  11. Language Arts

    Under a spreading chestnut tree which syllables are unstressed?
  12. Language Arts

    Which sentence has correct subject - verb agreement a) casey or robbie are coming to the movies with us b) swimming and skiing is my favorite sports c) sandwhiches or pizza both sounds good for a quick dinner** d) either your brother or his friend is making a lot of noise ...
  13. Math

    15/6 x 7/6
  14. math

    ugh i have the same question..
  15. Physics- Help!!

    1. What is the heat required in kilocalories to convert 2 kg of ice at 0°C completely into steam at 100°C? (I thought it was 2000 kilo cals but I think I'm wrong??) a. 80 Calories b. 1440 Calories c. 4186 Calories d. 540 Calories 2. A gaseous refrigerant undergoes ...
  16. Trigonometry- ??????

    If vector a= (10,10) and vector b= (4,5) then ||a+b|| ≠ ||a|| + ||b||. Explain. I don't understand what this question is exactly asking, and I'm not sure how to answer it. Please explain. Thank you very much!!!
  17. Chem

    How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+
  18. Chem

    How were each of the following cations utimately separated from the rest of the group and /or decorated? The use of equations may be helpful, where applicable. Ag+ K+ Nh4+ Al+
  19. science

    Your Friend is correct!! I got 100% Thank you so much Your Friend!!
  20. physics 1401

    The time of the projectile motion is t=2v₀sinα/g sinα=gt/2v₀ =9.8•3/2•300=0.05 α=arcsin0.05=2.8°
  21. PHYSICS

    If ‘v’ is the speed of the bout and ‘u’ is the speed of the stream then 48/(v+u) + 48/(v-u) = 14 4/(v+u) = 3/(v-u) 48 v =7(v+u) (v-u) 4v-4u = 3v+3u => v=7u 48•7u = 7(7u+u)(7u-u) u=1 km/h
  22. PHYSICS

    5v₁+5v₂=150 25v₁-25v₂=150 v₁+v₂=30 v₁-v₂=6 v₁=18 m/s v₂ = 12 m/s
  23. Physics

    cesium-137: half-life 30.2 years, 0.3 MeV beta and 0.66 MeV gamma-ray emitter 1 Gray (Gy) = 1 joule of ionizing energy per kilogram Energy = 400 Gy•0.25 kg= 100 J 100J/0.3•10⁶•10⁻¹⁹=3.33•10¹⁵ disintegrations
  24. science

    it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? A) microscopically, chloroplast appear similar to ...
  25. Statistics

    A criminologist is studying school violence, she selects a random sample of 25 adolescents aged 12 to 15 from a local middle school and asks the following,"How many times within the past school year have you been physically assaulted at school? She calculated the ...
  26. Statistics

    Suppose we would like to estimate the mean amount of money spent on books by students in the fall semester. We have the following data from 400 randomly selected students: mean=$205 and s=$40. Assume that the amount spent on books by students is normally distributed. Compute a...
  27. math

    are the following a function 1. y=x/2 my guess is yes 2. y=2x+1 my guess is yes 3.y=x^2 my guess is yes 4.y=mx+b im not sure
  28. math

    Does a machine that takes one quarter at a time into its input and produces one gumball in its output act like a function? my guess is YES
  29. math

    An equation is not a function if even one x value produces ____ corresponding y value(s). one less than one more than one zero for a my guess is more
  30. math

    classify the following number as rational or irrational: 4.1 My guess is Rational
  31. math

    the associative property allows you to change the order of terms in an expression. true or false my guess is True
  32. math

    okay thank you I don't know what an inverse is lol
  33. math

    I don't understand. so is it or is it not a function
  34. math

    Is y=3x^2-2 a function? my guess is NO
  35. math

    thank you!
  36. math

    Which relationship would most likely have a positive correlation? The amount of memory in computer, and the number of keys on the keyboard. The rate at which a train travels, and the time it takes for it to reach its destination. The number of tickets sold for a baseball game...
  37. Math

    5
  38. Physics

    the charge on a pith ball was measured as +40 nC. if the charge on an electron is -1.6 x 10^-19, how many electrons have been added or removed from the ball?
  39. Chemistry - PLEASE HELP!!!

    A 5.0 g n2o (laughing gas) that is inside a 12 mL cylinder used used to fill up a 800 mL whipped cream container. Beforehand, the container had air in it at 760 torr atmosphere pressure at 25 degrees celsius. Then, we will add the n2o/air mix to balloon until the pressure in ...
  40. math

    Does the Commutative Property apply to this situation? I ate dinner and read a book. I got = Yes.
  41. math

    If Jim is twice as old as Jerry plus six, Jerry is three years older than Tom, and Tom is 12, how old is Jim? I got = Jim is 36
  42. Math

    if x-7=14 what is the value of x-2 Can someone help me with this. I know the answer, I just want to know how something like this is solved.
  43. earth science

    the Julian calendar is the calendar we currently use. True or false. my guess is true
  44. earth science

    one reason the moon might be a better place than earth to study the universe is there is almost no atmosphere. True or False MY guess is false
  45. earth science

    During the summer _________ in India, wet air from the Indian ocean brings heavy rain to India.
  46. earth science

    air pollution in pennsylvania causes ______ in new england because the wind blows the pollution into new England. can someone please help, I cant find this anywhere.
  47. SCIENCE

    The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE
  48. EARTH SCIENCE

    Smog is the worst in.. A. Chicago B. New York C. Los Angles MY GUESS: C. LOS ANGLES
  49. Earth science

    THANKS
  50. Earth science

    TRUE OR FALSE The burning of fossil fuels cause the earth to get warmer by putting carbon dioxide in the atmosphere and the carbon dioxide traps heat. MY GUESS: TRUE Isobars help meteorologists find fronts on weather maps. MY GUESS: FALSE A CLOUD IS A COLLECTION OF WATER ...
  51. Geography

    Thank you!
  52. Geography

    I have an essay that says.. "It has been said that Eastern Europe is a political region more than a physical region. Would you agree or disagree with this statement? You must provide a solid argument for your position." since it asks me for my opinion how do I write ...
  53. Math

    the average of five numbers is 16. Suppose 10 is added to five numbers. What is the average of the six numbers?
  54. chemistry

    Use activity coefficients to find the concentration of hydrogen ions in a solution of 90.0 mM butanoic acid and 0.05 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. How do I calculate the ionic strength ...
  55. math

    two students are playing a math game . the object of the game is to make the least possible number by arranging the given digits inside absolute value bars on a card . in the first round , each player will use the digits 3,5,and7 to fill in the card. One student arranges the ...
  56. Whats this

    middle East
  57. chemistry

    4.62kj
  58. Law

    2. http://en.wikipedia.org/wiki/Diversion_program
  59. physics

    Here, u1 = 30 km/h t = 2 s u2 = 33.6 km/h a = (u2 – u1)/t a1 = (33.6 – 30)/2 = 1.8 ms-2 Similarly, a2 = (37.2 – 33.6)/2 = 1.8 ms-2 The acceleration of the vehicle is 1.8 ms-2
  60. MATH

    B. 5/51
  61. MATH

    I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ...
  62. MATH

    I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ...
  63. business

    This site will show you what you need http://www.opengroup.org/public/arch/p4/bus_scen/bus_scen.htm
  64. algebra

    This site shows you how to find terms of the sequence http://www.math-magic.com/sequences/next_term.htm
  65. I may fail the 8th grade?

    1. Take a deep breath. 2. I may be able to help. 3. post questions on your homework here and either ms.sue will help or me. BTW HELP we wont give you the answers but we will ensure help and explanations and you will get it right
  66. Biology

    A virus is a rudimentary biosystem that has some of the aspects of a living system such as having a genome (genetic code) and the ability to adapt to its environment. A virus, however, cannot acquire and store energy and is therefore not functional outside of its hosts. ...
  67. biology

    A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. A prion is an infectious agent composed of protein in a misfolded form.
  68. Psychology

    Read this and find your answer http://www.sirc.org/publik/drinking3.html
  69. Psychology

    What may ultimately make an abnormal behavior into a genuine mental disorder is if the behavior: 1. is maladaptive (harmful to self or others) 2. causes significant social impairment 3. causes significant occupational impairment 4. causes great personal pain and emotional ...
  70. biology

    The basic difference is their components. Viruses contain both nucleic acids (DNA or RNA) and a protein coat. Viruses cause infection by inserting their genetic material in a host cell. The host cell then replicates and reads the genetic material, making new viruses that ...
  71. Algebra

    there are 56 ways
  72. Algebra

    use the 8C3.now, can u evaluate the value of 8C3 ?.nCr = n!/r!(n-r)!it is the general formula of combination. also u have know about the "factorial", like 3! = 3 * 2 * 1 = 6 8C3, in this case knowed n=8 and r=3. by using the formula above, it can be 8C3 = 8!/3!(8-3...
  73. Measurment

    To answer this question, you'll need to find the surface area of the top of the container (which is a circle), along with the surface area of the side of the container.Note that the diameter of the container is given and is 6 inches; therefore, the radius is ... what? Note...
  74. english

    I think its either A. or C. but im not sure. Maybe A
  75. english

    In "A Man Called Horse," After his wife leaves him, Yellow Robe Behaves recklessly in battle because he A. would rather die than live with the bitterness he feels as a result of his lost pride B. is trying to gain membership in the society known as the foxes C. ...
  76. english

    I think its D
  77. english

    writers portray the personalities of characters A. only through revealing the characters private thoughts. B. through plot complication. C. only if the plot is not important to the story. D. through a variety of methods.
  78. 7 grade math

    Thank you @Bobpursley!!
  79. 7 grade math

    Consider two types of nonlinear equations. What unique quality does each possess and how does that quality cause the graph's unique shape? Name two unique examples of these shapes in real-world situations.
  80. URGENT Physics help

    F=kq₁q₂/r² q₂= F r²/kq₁= 7.2•10⁻²/9•10⁹•4•10⁻⁶= =2•10⁻⁶ C = 2μC Cpper rod is an electrical conductor; the others are insulators.
  81. Physics

    C=q/Δφ q=C Δφ
  82. engineering

    In the question I have some strenths and w/c ratios of some specimens and it is asking me about the range,molds?Also,How many specimens should be taken for each batch of concrete? This is a question before we learn it,so really have some understanding problems.
  83. engineering

    Hello guys.I got a homework and seem like I am stocked. a)What type of experiments should be done to find the relationship between the strength of concrete and water/cement ratio. b)what will be the range of the water/cement ratio? It would be great if you help.Thank you!
  84. Math

    To Damon: thank you so much for your help :))))))
  85. Math

    To Steve: I just copy that from my child's textbook as it is. Thank you for your great advice, I'll forward it to his math teacher.
  86. Math

    Hector has $450 and saves 20 per week. Tim has $1200and spends $30 per week.write a system equation for this situation
  87. Physics 194

    d•sinφ=kλ, tanφ=x/L. => d•x/L=kλ λ₁=dx₁/Lk λ₂=dx₂/Lk λ₁/λ₂=dx₁Lk/dx₂Lk= x₁/x₂ λ₂=λ₁x₂/x₁=630•0.21/0.26=508 nm
  88. Physics

    bsinφ=k λ sinφ=kλ/b, a) sinφ=1•630•10⁻⁹/0.020•10⁻³=0.0315 φ=1.8° b) sinφ=1•630•10⁻⁹/0.20•10⁻³=0.0035 φ=0.18° c) sinφ=1•630•10⁻⁹...
  89. physics

    a=ω²R, F(fr)=μN=μmg, ma =F(fr) => mω²R₁= μmg m(2ω)²R₂=μmg ω²R₁=4ω²R₂ R₂=R₁/4
  90. Physics

    E=0
  91. physics

    Imagine that F₂ is along the x-axis, F is along y-axis, and F₁ is directed to the “north-west”. The angle between F and F₁ is α. sin α = F₂/ F₁=1/2 α=30° Thus, the angle between F₁ and F₂ is 90°+30°...
  92. Physics

    W=mg
  93. physics

    1/λ₁ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/1²) –(1/3²)] λ₁=2.56•10⁻⁸ m 1/λ₂ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/2²) –(1/...
  94. physics

    E=5eV=8•10⁻¹⁹ J λ=h/p = h/sqrt(2mE) = =6.63•10⁻³⁴/sqrt(2•9.1•10⁻³¹•8•10⁻¹⁹)=5.5•10⁻¹⁰ m
  95. physics

    S=Energy per unit time/Area = Nhf/A= =4Nhc/πD²λ= =4•1.42•10¹⁸•6.63•10⁻³⁴•3•10⁸/π•(1.82•10⁻³)²•524•10⁻⁹= =2.07•10⁵ W/m² Electric ...
  96. physics

    (a) 1/do+1/di =1/F 1/di=1/F-1/do=1/48.5•10⁻³- 1/3.85•10⁸. di≃48.5•10⁻³m x/di=D/do x=D•di/do =3.48•10⁶•48.5•10⁻³/3.85•10⁸.= =4.38•10⁻⁴ m (b) 1/do₁+1/di₁...
  97. physics

    tan(α/2) =x/L => x=L tan(α/2) Coordinate of the second dark fringe is x=(2k+1)Lλ/d L tan(α/2)= (2k+1)Lλ/d d/λ =(2k+1)/tan(α/2)= (2•2+1)/tan3.6°=79.5
  98. Physics

    (i) h=gt²/2 t=sqrt(2h/g)=sqrt(2•10000/9.8)=45.2 s. (ii) v=800000/3600 = 222.2 m/s s=vt =222.2•45.2 =10044 m (iii) x=0 (since the horizontal speed of the cargo is constant)
  99. Physics

    The speed of sound at 20°C v=343 m/s s=vt=343•3=1029 m
  100. Physics

    If the detector (radar)is at rest and the source (moving car that reflects the sound)) is moving away from the detector, the observed frequency f is less than the actual frequency f₀. The speed of sound v =343 m/s f=f₀v/(v+V) V=v(f₀-f)/f =343•(1.5-1.4)&#...
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