R_scott

Newest questions and responses by R_scott
  1. Maths

    change km/hr to m/s find how long for the train to pass a given point ... t length of bridge = (12 - t) * speed of train

    posted on January 16, 2019
  2. Maths

    close, but ... 14 cm is the RADIUS of the cylinder, ... while 4 mm is the DIAMETER of the wire 14^2 * 10 = (0.4 / 2)^2 * x

    posted on January 16, 2019
  3. Algebra repost

    oobleck ... and if x happens to be negative...?

    posted on January 16, 2019
  4. Algebra repost

    n > 4

    posted on January 16, 2019
  5. Science

    you are correct a temperature differential is necessary for heat transfer

    posted on January 16, 2019
  6. math

    12 compoundings (two per year) 4.5% per compounding A = 18000 (1 + .045)^12

    posted on January 16, 2019
  7. math

    3.4E9 in scientific notation

    posted on January 15, 2019
  8. Physics

    p v = n r t you can see from the gas equation that pressure and volume are inversely related like the graph of x y = constant

    posted on January 14, 2019
  9. algebra

    solve the given equation for h rearranging and simplifying ... 0 = h^2 + 2 h - 99 factor or use the quadratic formula

    posted on January 14, 2019
  10. math

    principal * interest rate * years

    posted on January 14, 2019
  11. Math

    1" / 280' = x" / 756'

    posted on January 14, 2019
  12. chemistry

    it is a constant ... like specific heat ... look it up

    posted on January 14, 2019
  13. chemistry

    heat the ice to 0ºC ... specific heat of ice? melt the ice to water at 0ºC ... heat of fusion of ice?

    posted on January 14, 2019
  14. physics

    you're correct Newton's equal and opposite reactive force

    posted on January 14, 2019
  15. Physics

    b) impulse is the change in momentum ... final minus initial ... look at your deltav value ... velocity is a vector ... magnitude AND direction this should also "fix" c)

    posted on January 13, 2019
  16. math

    12 n = n^2 + 36 0 = n^2 - 12 n + 36 = (n - 6)^2 n - 6 = 0

    posted on January 12, 2019
  17. Physics

    a = f / m divide the initial velocity by the acceleration to find the stopping time

    posted on January 11, 2019
  18. Physical Science

    both silk and rubber attract electrons from glass rubber attracts electrons from silk , so it has the strongest attraction

    posted on January 11, 2019
  19. Maths

    each of the four aces is combined with four of the other 48 cards 4 * 48C4

    posted on January 11, 2019
  20. Math

    nine total points below average , so nine total above Don scored four points above average ... Cara outscored him by one point ... 29

    posted on January 11, 2019
  21. Physics

    a. v^2 = 2 g h = 2 * 32 * 560 b. average speed is half of the initial (zero at the top) ... time = distance / speed

    posted on January 11, 2019
  22. math

    t + b = 65 3 t + 2 b = 153 solve the system

    posted on January 11, 2019
  23. Math

    subtract the equations (to eliminate y) solve for x , then substitute back to find y

    posted on January 11, 2019
  24. chemistry

    your technique should work ... not sure about the last "lowest quotient" step C ... 140.22 * .5139 / 12.011 = 5.999 H ... 140.22 * .0864 / 1.0079 = 12.02 N ... 140.22 * .3997 / 14.007 = 4.001 looks like C.

    posted on January 11, 2019
  25. Physics

    impulse is the change in momentum the velocity (parallel to the wall) is constant along its flight path the change in velocity (and momentum) is as you say ... normal to the wall ... the incoming and outgoing speeds are both ... 15 m/s * sin(45º)

    posted on January 11, 2019
  26. Math

    amount = 8000 * e^(.05 * t)

    posted on January 11, 2019
  27. Physics

    a person should land in the pool (as opposed to passing over it) ... their velocity is such that it allows the fall from 1.2 m before they clear the 3.0 m length find the time to free-fall 1.2 m ... divide the time into 3.0 m to find the max safe velocity

    posted on January 10, 2019
  28. Probability

    there are 26 red cards, and two black kings 28 possibilities in a 52 card deck

    posted on January 10, 2019
  29. Math

    volume = base area * height

    posted on January 10, 2019
  30. Science

    find the time for the stone to reach the ground ... 0 = -4.9 t^2 + 5 t + 50 multiply the time by the balloon's velocity , and add 50 m

    posted on January 10, 2019
  31. algebra

    why do you need help ... you got the correct response

    posted on January 9, 2019
  32. algebra

    I'm afraid that Henry2 has gone astray y = 2/5 x- 17 7/10 ... y = .4 x - 17.7 y = -5/2 x + 20 ... y = -2.5 x + 20 subtracting equations ... 0 = 2.9 x - 37.7 ... solve for x

    posted on January 9, 2019
  33. Chemistry

    the atomic mass of potassium is ≈ 39.1 g find the fraction of a mole in the cereal

    posted on January 8, 2019
  34. algebra

    the leading term has the greatest exponent ... 5 in this case ... you should use the "caret" symbol (^) for exponentiation 5 is odd, so the behavior at the positive and negative ends of the graph are opposite a large negative x value causes the function to

    posted on January 8, 2019
  35. Algebra

    the (2M+5) takes the place of X in the function f(2M+5) = -3(2M+5) + 1

    posted on January 8, 2019
  36. Maths

    4 Cos²B + 2 CosB - 1 = 0 use the quadratic formula to find the values of CosB

    posted on January 8, 2019
  37. Maths

    it takes 24 man-days to dig the ditch if it takes 3 days, how many men are digging?

    posted on January 8, 2019
  38. Chemistry

    hydrocarbons generally combust to carbon dioxide and water

    posted on January 8, 2019
  39. science

    the forces acting on the crate are gravity and buoyancy what's the net result?

    posted on January 8, 2019
  40. math

    none the lines are parallel and never intersect

    posted on January 8, 2019
  41. science

    same idea as the boy kicking the ball

    posted on January 8, 2019
  42. science

    the boy exerts a force on the ball the ball exerts an equal (and opposite) force on the boy

    posted on January 8, 2019
  43. algebra

    working in decimals is easier subtract the equations to eliminate y solve for the x value, then substitute back to find y

    posted on January 8, 2019
  44. Chem

    which has more eggs...a dozen chicken eggs or a dozen goose eggs?

    posted on January 7, 2019
  45. science

    mass = force / acceleration

    posted on January 7, 2019
  46. statistics

    use a z-score table to find the lengths represented by bottom 20% and the top 15% of the population the top is ≈ 1.04 s.d. above the mean the bottom is ≈ 0.84 s.d. below the mean

    posted on January 7, 2019
  47. Physics

    the "balancing" 3rd force is the force 180º opposite the vector addition of the given forces

    posted on January 7, 2019
  48. Algebra

    multiplying by 20 ... 20y = -8x + 5 8x + 20y - 5 = 0

    posted on January 7, 2019
  49. Math

    8 = 2^3 (2^3)^x = (2^x)^3 = 10^3

    posted on January 5, 2019
  50. math

    A) displacement is the distance (and direction) from the starting point to the finishing point ... it is a vector quantity B) the average speed is the actual distance that he ran, divided by the time it took ... it is a scalar quantity C) the average

    posted on January 2, 2019
  51. Math

    A. using a planar section through the Earth from pole to pole ... construct a right triangle using the center of the Earth, the equatorial plane, and the line of 46ºN ... the hypotenuse is the radius of the Earth from the center to 46ºN ... the side

    posted on January 2, 2019
  52. Physics

    the water in the flask loses heat to the ice ... (mass of water) * (specific heat of water) * (temperature change) the ice melts , and the resulting water is heated to the final flask temperature ... (mass of ice) * (latent heat of fusion of ice) ... plus

    posted on December 23, 2018
  53. science

    there are five "stages" heat ice to 0º melt ice heat water to 100º boil water heat steam you will need the specific heats of ice, water, and steam

    posted on December 22, 2018
  54. Science

    yes they are usually called "recessive" genes

    posted on December 21, 2018
  55. Chemistry

    look up CALCIUM's electron structure

    posted on December 21, 2018
  56. Calculus

    as x becomes very large , the -8 and -6 become inconsequential the function approaches 2

    posted on December 21, 2018
  57. math

    the side length of the inner triangle is ... 9 - √3 the ratio of the areas is the square of the ratio of the side lengths

    posted on December 19, 2018
  58. math

    "within" is taken to mean "not touching a side" the center of the coin must land inside of a "nested" inner triangle whose edges are parallel to the 9 cm triangle and .5 cm inside the ratio of the areas of the inner and outer triangles is the probability

    posted on December 19, 2018
  59. Physics

    which one can't you feel?

    posted on December 17, 2018
  60. Physics

    speed = wavelength * frequency

    posted on December 17, 2018
  61. Chemistry

    P atoms ... 283.89 * .4364 / (P atomic mass) O works the same way

    posted on December 17, 2018
  62. Physics

    total ε is ... 3 * 2.20 v total r is ... 3.27Ω + (3 * 0.0100Ω) find circuit current calculate load potential

    posted on December 13, 2018
  63. Physics

    twice the voltage drop means twice the resistance

    posted on December 13, 2018
  64. Earth Science

    mass number = protons + neutrons atomic number = protons

    posted on December 13, 2018
  65. science help

    correct they are the ones that participate in chemical bonding

    posted on December 13, 2018
  66. science

    total points is greater than or equal to 420 ... 82 have already been scored ... p = points still needed p + 82 ≥ 420

    posted on December 13, 2018
  67. Algebra 1

    w + w + (2 w + 3) + (2 w + 3) = 48

    posted on December 13, 2018
  68. Algebra

    multiply 1st eqn by 7 add to 2nd eqn to eliminate x solve for y , then substitute back to find x

    posted on December 12, 2018
  69. Ap chemistry

    0.625 = 10 (1/2)^(t / 3) log(0.625 / 10) = (t / 3) log(1/2) or ... 10 , 5 , 5/2 , 5/4 , 5/8

    posted on December 12, 2018
  70. sport

    athletes from almost every country in the world participate there are many different sports (events)

    posted on December 12, 2018
  71. math

    what graph?

    posted on December 12, 2018
  72. Math or Algebra

    (1.8 * 3.6) x (10E-2 * 10E4) multiply the number part ... sum the powers of 10

    posted on December 12, 2018
  73. Math

    x is GREATER than -5 ... to the right of -5 on the number line

    posted on December 12, 2018
  74. Physics

    the ambient pressure increases by one atmosphere for every 10 m of depth nitrogen (≈ 80% of the air) goes into solution in the blood at elevated pressures , and acts as an intoxicant ... air mixtures where the nitrogen is replaced by helium and/or argon

    posted on December 12, 2018
  75. chemistry

    K.E. = 3/2 k t k = 1.38E-23

    posted on December 12, 2018
  76. Algebra 2

    from 1st eqn ... y - 1 = 7x substitute for 7x in the 2nd equation

    posted on December 12, 2018
  77. Science

    some of the individuals in the population may have traits that will allow them to cope with the changing climate a population can only change itself over time by producing new individuals with new traits...it's a slow process for trees

    posted on December 11, 2018
  78. Math

    looks good

    posted on December 11, 2018
  79. pre-algebra

    .24 * w = 3.6

    posted on December 11, 2018
  80. Math

    I think you're correct ... I'm pretty sure

    posted on December 11, 2018
  81. Math

    100 cm = 1 m ... (100 cm)^3 = (1 m)^3 1000 g = 1 kg

    posted on December 11, 2018
  82. Math

    divide the cost by the minutes

    posted on December 11, 2018
  83. Science

    P.E. = m g h if h is twice as large , then ...

    posted on December 11, 2018
  84. Science

    the point where the diver's center of mass is the highest

    posted on December 11, 2018
  85. Physics

    system momentum is conserved they have equal and opposite momenta before the collision

    posted on December 11, 2018
  86. science help

    three of the questions are mood/opinion...

    posted on December 10, 2018
  87. physical science

    density = mass / volume

    posted on December 10, 2018
  88. Algebra

    you sure the 6 is not a G??

    posted on December 10, 2018
  89. Physics

    the record has a smaller radius 1/2 * 2 * .17^2 * 50 rpm = 1/2 * ω * [(2 * .17^2) + (1.3 * .16^2)]

    posted on December 10, 2018
  90. math

    8 * 30 = (8 + g) * 20

    posted on December 10, 2018
  91. Physics

    the center of mass of the stick is at 50 cm , 20 cm from the balance point a. 15 cm * 200 g = 20 cm * m b. the normal force equals the weight of the stick and the 200 g mass ... n = g (m + 200 g)

    posted on December 10, 2018
  92. Math

    double ... 2 = [1 + (.07 / 3)]^(3 y) ... ln(2) = 3 y ln[1 + (.07 / 3)] ... solve for y continuously ... 2 = e^(.07 y) ... ln(2) = .07 y

    posted on December 9, 2018
  93. math

    0 ≥ 4 x^2 + 8 x - 5 0 ≥ (2 x + 5) (2 x - 1) for their product to be positive (>0), both factors must have the same sign both ≥ 0 ... x ≥ 1/2 both ≤ 0 ... x ≤ -5/2

    posted on December 9, 2018
  94. Physics

    the wheel had an initial vertical velocity, and was then accelerated by gravity for 8.5 s final vel y = init vel y + (8.5 s * g) ave vel y = (final y + init y) / 2 ave vel y * 8.5s = height horiz dist = x vel * 8.5 s init K.E. + (m g h) = fin K.E. (init

    posted on December 9, 2018
  95. Physics

    (1) + (3) = 14 N @ 270º (2) + (4) = 0 resolve 50 N @ 60º into 0º and 90º components combine with 14 N @ 270º the equilibrium force will have the same magnitude, but opposite direction

    posted on December 8, 2018
  96. Math

    start with 2 and work your way up 540 / 2 = 270 270 / 2 = 135 135 / 3 = 45 45 / 3 = 15 15 / 3 = 5 2^2 * 3^3 * 5

    posted on December 8, 2018
  97. Physics

    distance = average velocity * time d = [(0.0 m/s + 42 m/s) / 2] * 5.9 s

    posted on December 8, 2018
  98. Chemistry

    Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(s) + 2NH3(g) water is the limiting reactant ... 75.0 g / 18.0 g/mole = 4.17 moles expected NH3 ... 4.17 / 3 = 1.39 moles ... molar mass NH3 ... 17.0 g % yield ... 15.0 g / (1.39 mol * 17.0 g/mol)

    posted on December 8, 2018
  99. algebra

    parallel means same slope only one fits ... not the one you chose

    posted on December 7, 2018
  100. Physics

    6Ω total resistance , so 2A current potential difference = current * resistance

    posted on December 7, 2018