Posts by scott

Total # Posts: 3,662

  1. Math

    chlorine is in Group 17 try the other side of the table
  2. physics

    hey ... this works the gravitational potential energy of a object at a distance r from a large body is ... G M m / r the difference in the P.E. on the surface and at altitude is the K.E. at launch (G M m / r) - [G M m / (r + h)] = 1/2 m v^2 solve for h ... might be easier to ...
  3. physics

    have you had calculus? the launch speed and low moon gravity means that the capsule goes beyond the region where g is relatively constant the force is related to the height by the universal gravitational equation ... f = G M m / (r + h)^2 force * height = energy ... ? de = ? f...
  4. Science

    the compound H2O is broken into its constituent elements, hydrogen and oxygen
  5. Algebra

    9 c - 5(30 - c) = 18 ... 14 c - 150 = 18
  6. physics

    g on the moon is 1.62 m/s^2 v^2 = 2gh ... h = v^2 / (2 g)
  7. chemistry

    the volume is directly related to the absolute (Kelvin) temperature ... also called Charles' Law ... Kelvin temp = Celsius temp + 273 final volume = initial volume * [(final Kelvin temp) / (initial Kelvin temp)]
  8. Chem

    you diluted a 210 ?M solution to 1/25 of its original 210 / 25 = 8.4 looks good
  9. Math

    B + S + D = 93 B = 4S D = S - 3 substituting ... (4 S) + S + (S - 3) = 93
  10. Math

    parallel lines have similar equations, but different x/y intercepts y = 2x + b plug in the given point to find b
  11. Math

    looks good
  12. math

    c = 2 i 7.8 i + 8.9 c = 1280 substituting ... 7.8 i + 8.9 (2i) = 1280 solve for i , then substitute back to find c
  13. Math

    |L - 12'| ? 2.88"
  14. physics

    the berg is floating , so it has already displaced its mass in water melting won't change the water level
  15. math

    M = 3/5 s M - 20 = 2/5 (s - 20) substituting ... 3/5 s - 20 = 2/5 s - 8 solve for s , then substitute back to find M
  16. Algebra 1

    x at 10%, and y at 14% x + y = 10000 .10 x + .14 y = 1280 ... multiplying by -10 ... -x - 1.4y = -12800 adding equations (to eliminate x) ... -.4 y = -2800 solve for y , then substitute back to find x
  17. math

    3/5 d + [7/8 (2/5 d)] + 1 = d 3/5 d + 7/20 d + 1 = d 12/20 d + 7/20 d + 1 = d
  18. math

    3/5 d + [7/8 (2/5 d)] + 1 = d 3/5 d + 7/20 d + 1 = d 12/20 d + 7/20 d + 1 = d
  19. Math IMPORTANT

    length is not a property directly associated with a circle
  20. chemistry

    pH + pOH = 14 pH + 9 = 14 ... pH = 5 -log[H?] = 5 ... log[H?] = -5 ... [H?] = 1E-5 pH < 7 means acidic
  21. Chem

    the pressure is directly proportional to the absolute (Kelvin) temperature Kelvin = Celsius + 273 p = .989 atm * [(45 + 273) / (71 + 273)]
  22. Science

    looks good
  23. Science

    if you google "polygenic punnett square practice", you will see "Punnett square practice and examples" at "bifidosoft" it looks like a pretty good tutorial
  24. Chemistry

    you have the letters mixed up search for GC/MS ... Gas chromatography–mass spectrometry
  25. chem

    at constant temp and pressure, the volume is directly related to the number of moles added moles = new moles - 7.51 mol = 7.51 [(15.9 / 4.11) - 1]
  26. Maths

    1.21 L W = x L * x W 1.21 = x^2 ... x = 1.1 ... a 10% increase
  27. exponential functions help please

    it looks like if you multiply X by 4, you get Y that's linear ... not exponential
  28. Chem

    the volume is directly proportional to the (absolute) temperature (ºK) and inversely proportional to the pressure v = 3.20 L * (1.50 / .989) * [(21.80 + 273) / (14.80 + 273)]
  29. Chem

    the volume is inversely proportional to the ambient pressure v = 7.0 L * (765 / 725)
  30. Physics

    work is energy is a scalar Wair = initial K.E. - final K.E. - m g h positive ... you are correct
  31. Trig

    which of the functions is 1 at ?/2?
  32. MATH

    isn't try B
  33. Math

    B' is ... (2?2 , -2?2)
  34. chem

    the volume is directly proportional to the ABSOLUTE (ºKelvin) temperature ... K = C + 273 v = 1.51E6 L * [(103 + 273) / (11 + 273)]
  35. Trigonometry

    resolve the two vectors into x and y components add the respective components find the resultant vector
  36. Math

    ?(9x^2 -24x +16) = 3x - 4
  37. Chemistry

    P = 5.00 mg * 1E-5 % = 5.00E-10 g P atoms = (5.00E-10 / 31.0) * 6.02E23
  38. Maths

    the equation is ... x + 24 = 36 after the semicolon is a space to fill in the x-value of the solution ... x = _____ (12, in this case)
  39. algebra

    -7 < x < 4
  40. math

    looks good
  41. Probability

    there are 6^5 possible outcomes 6 of those have all the numbers the same
  42. Trigonometry

    speed^2 = 2^2 + 5^2 ? is the angle downstream from directly across ... tan(?) = 2/5
  43. math

    c is the combined time Shannon paints c/16, and Emily paints c/20 the two fractions add to 1 (the whole room) c/16 + c/20 = 1 ... 5c + 4c = 80
  44. Math: Area of Circles

    area = ? r^2 = ? d^2 / 4 ? is pi ... 3.14159...
  45. Math

    N = 1E6 (1 - .05)^t
  46. Probability

    p(outside) = 14/29 p(not visible) = 1/29 probability of two independent events is the product of the individual probabilities
  47. maths

    w = 4 d (w - 5)(d - 5) = 175 (4 d - 5)(d - 5) = 175 ... 4 d^2 - 25 d - 150 = 0 use quadratic formula to find d ... then substitute back to find w
  48. Probability

    there are 6^3 ways to travel on the three days walking on one day leaves 5^2 options for the other two p = (3 * 5^2) / (6^3)
  49. Math

    Reiny following your pattern; if x^n is the largest term , then there are 2n+1 terms the (increasing) term coefficients are one greater than their corresponding exponent you're missing some terms/coefficients in the squaring of the smaller polynomial the easycalculation ...
  50. Math

    google "polynomial multiplier calculator" use the easycalculation application
  51. Science

    the moon's mass is about 1/6 of earth, so the gravitational potential energy is also about 1/6
  52. Physics

    momentum is conserved, and energy in an elastic collision up is positive (50 * 4.0) - (.45 * 30) = (50 p) + (.45 b) ... 186.5 = 50 p + .45 b 1/2 [(50 * 4.0^2)+(.45 * 30^2)] = ... 1/2 [(50 * p^2)+(.45 * b^2)] ... 1205 = 50 p^2 + .45 b^2 solve the system of equations for b ... ...
  53. math

    28 * 1 1/4 = 35 2 1/2 * 12 = 30 (35 - 30)/ 1 1/4 ... on another shelf
  54. math

    a. (4 * 1) + (5 * 2) = 14 = .875 p b. 10 - 5 - 4 = ? c. .125 p
  55. Math

    x^2-6x+9 is already a perfect square ... (x-3)^2 an equation is needed for a solution
  56. Science (Last question of these)

    momentum is conserved right is positive (10 * 20) - (B * 20) = (B * 0) - (10 * 20) 2(10 * 20) = B * 20
  57. Math 30-2

    6C3 * 5C4
  58. Math 30-2

    A. 150^3 B. 150 * 149 * 148
  59. math

    160 / 4 = 40 41 , 39 , 43 , 37
  60. Alg I

    arithmetic ... the difference is 6 (1536 - 12) / 6 = ? 12 is the 2nd term ... 1536 is the (?+2) term geometric ... the ratio is 2 12 * 2^? = 1536 1536 is the (? + 2) term
  61. maths

    2y + 5x = 4 2y = -5x + 4 y = -2.5x + 2 algebra, right??
  62. maths

    I answered that correctly 2/25 1:34pm why do you think it was wrong
  63. physic

    f = m a net force = -[(8m/s^2)/(2.26 kg)]i + [(6m/s^2)/(2.26 kg)]j subtract F1 and F2 from the net force to find F3
  64. Trig Math

    C = 25000 cos(?) plug in the various values of ? to find the corresponding C
  65. science

    force equals mass times acceleration force is directly proportional to both quantities
  66. Algebra 1

    x = 6 + 2 (6 + 2)^3 - 1 = ?
  67. Algebra

    the profit is the difference between the student fees and the studio rental cost P = (N * F) - C F = (P + C) / N
  68. Math

    t = 1161.87 - (1161.87 / 1.02)
  69. math

    [87 (p - 1)] + 82 = 86 p
  70. math

    P E M D A S
  71. Math

    halving the height, halves the volume doubling the radius, quadruples the volume 1/2 * 4 = 2 ... volume is doubled
  72. Algebra

    for annual compounding total value = initial (1 + interest)^years t.v. = 2800 (1 + .0265)^7
  73. Chemistry

    NO ... not one of the choices ... remember the sig fig hint
  74. Chemistry

    2.10 * 530 * (-15.0 - -45.0) = ? J careful with sig fig
  75. math

    m - m/3 - 5 - 3/5(m - m/3 - 5) - 9 = 45 m - m/3 - 3m/5 + m/5 = 56 15m - 5m - 9m + 3m = 840
  76. Physics

    oops...got the fraction inverted
  77. Physics

    accel = force / mass = 32 / 20 = 1.6 m/s^2 (9.0 m/s - 4.0 m/s) / 1.6 m/s^2 = ? s
  78. Physics

    3.6 / .45 = ? hz
  79. Algebra

    J = a/2 - 3
  80. Maths

    200% more means three times as large the length and width of the projector screen are three times the length and width of the television screen this means the area of the larger screen is nine times the area of the smaller nine times means 800% more
  81. math

    mag = ?[(-7 - -4)^2 + (3 - 1)^2] tan(?) = (3 - 1) / (-7 - -4) ... Quad II
  82. maths

    easy technique for this format of problem swap the coefficients ... 2y - 5x = ? change one sign ... 2y + 5x = ? plug in point ... 2(7) + 5(-2) = 14 - 10 = 4 equation is ... 2y + 5x = 4
  83. AP-B Physics

    2.00 rad/s * 1.7 s = ? rad
  84. Physics

    work = force * distance = 30 N * 6 m ... answer is in Joules work = m g h = 50 * 9.8 * 300
  85. Perimeter and fraction,Grade 6th Maths

    perimeter = 2 length + 2 breadth 80 = (2 * 32) + 2 breadth 80 = 64 + 2 breadth 16 = 2 breadth ... 8 = breadth
  86. Science

    A. K.E. = 1/2 * mass * (velocity)^2 B. work and energy are the same thing ... measured in Joules
  87. Math

    looks good
  88. Math

    D = k v^2 ... 90 = k * 70^2 ... k = 9 / 490 D = (9/490) * 71^2
  89. physical science

    force times distance equals work (energy)
  90. physical science-asap

    work (energy) = force * distance 10 J = 10 N * ?
  91. Math

    looks good
  92. Physics

    momentum is conserved the mass is doubled, so the velocity components are halved ... 1 m/s N and 5 m/s E magnitude of v ... v^2 = 1^2 + 5^2 direction ... tan(?) = 1 / 5 ... ? is the angle north of east
  93. Math

    R = .1639 V^2 R = .1639 * 215^2
  94. physics

    the tension in the string provides a horizontal force of 5.8 lb, and a vertical force of 10 lb tan(?) = 10 / 5.8
  95. Math

    A = k B^2 a) 45 = k * 3^2 ... k = ? b) A = ? B^2 c) A = ? * 6^2
  96. physic

    f = G * M1 * M2 / r^2 7.30E25 = 6.67E-11 * M1 * M2 / 1.50E12^2 solve for (M1 * M2) M1 + M2 = 6.00E30 substitute to find M1 and M2
  97. algebra 2

    f(x) = (x + 1)(x + 1)(x - 6) multiply the binomials
  98. Math

    yes
  99. Science

    the gravitational attraction of the masses is what holds the moon in orbit gravity provides the centripetal force for the circular (mostly) path
  100. Geometry

    you're doing fine plug in all the numbers you have, and solve for the missing side (the only non-number)
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