R_scott

Popular questions and responses by R_scott
  1. Chemistry

    volume is directly proportional to the absolute (Kelvin) temperature and inversely proportional to the pressure v = 20 L * [(new temp.) / (old temp.)] * [(old press.) / (new press.)]

    posted on July 1, 2020
  2. Physics

    ...teach the group?? the range is ... R = [v^2 * sin(2Θ)] / g ... v is the launch velocity ... 200 m/s ... Θ is the launch angle ... 30º

    posted on July 1, 2020
  3. Mathematics

    each team will play four games...one with each of the four other teams there are ten games in total ... five teams each playing four games ... 5 * 4 = 20 ... but ...A playing B is the same as B playing A ... so ... 20 / 2 = 10

    posted on June 30, 2020
  4. Mathematics.

    volume is, the area of the cross-section, multiplied by the length v = [π * 3.5 cm)^2] * 8 cm

    posted on June 29, 2020
  5. math

    the two dice are independent events ... the probability of both occurring ... is the product (multiply) of the individual probabilities p = (6 / 26) * (3 / 12) remember to reduce fractions where possible

    posted on June 29, 2020
  6. physics

    momentum is conserved .125 kg * 25.0 m/s = (.125 kg + .101 kg) * v solve for the horizontal velocity (v) of the arrow/apple the flight time of the arrow/apple is the time it takes to fall 1.85 m 1.85 = 1/2 g t^2 ... solve for the flight time (t) the

    posted on June 29, 2020
  7. Math

    if the bases are the same , you can add the exponents (2/9)^3 × (2/9)^(-6) = (2/9)^(3-6) = (2/9)^(-3) (2/9)^(-3) = (2/9)^(2m - 1)

    posted on June 29, 2020
  8. Physics

    Δh = [1/2 * (-9.81 m/s^2) * (2.00 s)^2] - (15.0 m/s * 2.00 m)

    posted on June 26, 2020
  9. Physics

    11.26 m = 1/2 * g * (3.17 s)^2

    posted on June 26, 2020
  10. Physics

    h = [1/2 * (-9.81 m/s^2) * (0.250 s)^2] + (.250 s * 5.00 m/s) + 40.0 m

    posted on June 26, 2020
  11. Physics

    the accelerations are the same the velocities are different

    posted on June 26, 2020
  12. math

    the sides are unchanged

    posted on June 26, 2020
  13. math

    if two cups is one pint , how many pints is five cups?

    posted on June 25, 2020
  14. Physics

    20 * 377 * (200 - t) = [(50 * 4190) + (60 * 377)] * (t - 30)

    posted on June 25, 2020
  15. geometry

    the radius of the base is ... 18 cm * (300º / 360º)

    posted on June 25, 2020
  16. math

    8 oz = 1 C 2 C = 1 pt 2 pt = 1 qt 4 qt = 1 gal

    posted on June 25, 2020
  17. mathematics

    the parabola ... y = x^2 the line ... y = 2 x + 3

    posted on June 25, 2020
  18. math

    56 kg * 9.8 m/s^2 * 1.0 m / 1.4 s = ? Watts

    posted on June 25, 2020
  19. geometry

    yup

    posted on June 25, 2020
  20. Probability

    $65k is 1.2 s.d. above the mean use a z-score table to find the % (probability) this represents

    posted on June 24, 2020
  21. math

    (s + 6) * 2 = 26

    posted on June 24, 2020
  22. science

    balancing ... 2 HCI + Na2CO3 = 2 NaCI + H20 + CO2

    posted on June 24, 2020
  23. Physics

    mass of the block = volume * density force (weight) = m * g pressure = force / area ... newton per m^2 is a Pascal max pressure when resting on smallest side ... 1.2 m x 1.0 m min pressure when resting on largest side ... 1.2 m x 1.5 m

    posted on June 24, 2020
  24. Physics

    power = work / time = m g h / t = 75 kg * 9.8 m/s^2 * 12 * .20 m / 10 s = ? W

    posted on June 24, 2020
  25. Physics

    the platform height is one significant figure all of the responses are at least two significant figures

    posted on June 23, 2020
  26. Math

    taking natural log ... x ln(10) = ln(2) + 1

    posted on June 22, 2020
  27. Mathematics

    sin(B) / sin(A) = b / a C = 180º - A - B c = b * sin(C) / sin(B)

    posted on June 21, 2020
  28. geometry

    joining the midpoints means that the smaller triangle is half the height ... and half the base length of the larger triangle use the triangle area formula to find the relationship k * [1/2 * (b/2) * (h/2)] = 1/2 * b * h ... solve for k

    posted on June 18, 2020
  29. Math

    5.4% is lost to leakage ... so (100% - 5.4%) remains in the tank 1500 L * (100% - 5.4%) = ?

    posted on June 18, 2020
  30. Physics

    a. the work is equal to the initial kinetic energy of the block ... K.E. = 1/2 m v^2 = 1/2 * 4.0 kg * (6.0 m/s)^2 = ? Joules b. work = force * distance ... distance = (answer a.) / 88 N = ? m

    posted on June 18, 2020
  31. Math

    find f(x) for the values at the ends of the interval divide the difference in the f(x) values by the difference in the x values

    posted on June 18, 2020
  32. Physics

    2E4 C/s * 1E-4 s = ? C ? C / 1.6E-19 C/e = ? e

    posted on June 18, 2020
  33. Math

    use the quadratic formula to find the roots of the 1st equation then plug the numbers into the 2nd question

    posted on June 18, 2020
  34. Math

    $20 * .06 * 2000

    posted on June 17, 2020
  35. Physics

    1. yes ... 250 J is correct 2. kinetic energy = work ... 1/2 * m * v^2 = f * d ... find the work , then solve for the velocity ... 5 m/s seems correct ... maybe a significant figure issue? 3. similar to #2 ... work on the rocket is "net force" multiplied

    posted on June 17, 2020
  36. Calculus

    (a) differentiating ... f'(x) = -0.2 x - 0.7 (b) to find dp/dx , plug x=3 into f'(x)

    posted on June 17, 2020
  37. mathematics

    5% semiannually means 2.5% per compounding period balance = 500 * [1 + (2.5%)]^(6 * 2) b = 500 * (1.025)^12

    posted on June 16, 2020
  38. Mathematics

    18 hr : 48 hr 18 / 48 = 3 / 8

    posted on June 16, 2020
  39. math

    the coordinates are in alphabetical order ... x , y no +2 y-coordinate in the list

    posted on June 16, 2020
  40. mathematics

    t / 1.8 cm = 84 / 350

    posted on June 16, 2020
  41. mathematics

    x - 3 = k y^2 5 - 3 = 4 k ... k = 1/2 x - 3 = 1/2 * 6^2

    posted on June 16, 2020
  42. Physics

    the center of mass of the rule is at the 25 cm mark 40 g * (15 cm - 2 cm) = M * (25 cm - 15 cm)

    posted on June 16, 2020
  43. Math

    3rd and 4th days ... 18 km + 18 km = 36 km 36 km = 3/4 d after 1st day ... d = 48 km 48 km = 2/3 total d ... total d = 72 km G = 3 S G - 5 = 2 (S + 5) ... G = 2 S + 15

    posted on June 16, 2020
  44. Mathematics

    tan(Θ) = 120 / 400

    posted on June 16, 2020
  45. mathematics

    if r is a root (zero) , then x-r is a factor complex roots (containing i) occur in conjugate pairs ... if 2+2i is a root , then 2-2i is also P(x) = (x - 2 - 2i) (x - 2 + 2i) (x + 1) (x - 2) multiply the factors to find the 4th order function

    posted on June 15, 2020
  46. Chemistry

    moles H2SO4 = 10 g / (molar mass H2SO4) moles H2O = 20 g / (molar mass H2O) mole fraction H2SO4 = moles H2SO4 / (moles H2SO4 + moles H2O)

    posted on June 15, 2020
  47. Trigonometry

    distance between the exits is ... d1 = 81 km - 74 km road distance from balloon to x-81 ... d2 = 875.0 m / tan(11º) road distance to x-74 ... d3 = d1 - d2 angle of depression to x-74 ... tan(Θ) = 875.0 m / d3

    posted on June 15, 2020
  48. Math

    sin^2(θ) = 3 / 4 ... sin(θ) = ±√3 / 2

    posted on June 15, 2020
  49. math

    n-2 , n-1 , n , n+1 , n+2 , n+3 6 n + 3 = 519

    posted on June 14, 2020
  50. trigonometry

    the downhill angle of the fence is 110º ... 90º + 20º using the law of sines ... sin(Θ) / 2.5 = sin(110º) / 6.3

    posted on June 14, 2020
  51. mathematics

    oobleck is correct

    posted on June 14, 2020
  52. mathematics

    tan(Θ) = 2.1 / 15.9

    posted on June 14, 2020
  53. Physics

    heat = mass * specific heat * temperature change 25 * x * (100. - 27.5) = 85 * 4.19 j/g⋅ºC * (27.5 - 25.0)

    posted on June 14, 2020
  54. Algebra

    guessing a pie with a piece missing the outside circular perimeter is 5/6 of the circumference ... 5/6 * π * 2 * 7 the inside perimeter of the mouth is 2 radii ... 2 * 7

    posted on June 13, 2020
  55. Chemistry

    sample volume * molarity = moles .0284 L * 0.185 moles/L = ? moles

    posted on June 11, 2020
  56. Chemistry

    to find the moles of glucose in 54.30 g , divide by the molar mass

    posted on June 11, 2020
  57. Math

    2k + 8k + 10k = 180º ... k = 9º smallest angle is 2k

    posted on June 11, 2020
  58. Math

    the general circle equation is ... (x - h)^2 + (y - k)^2 = r^2 (h,k) is the center of the circle , r is the radius the equations of the two points should NOT be equal ... and they should have the correct format

    posted on June 11, 2020
  59. Physics

    work = force * distance 1210 = f * 20.0 ... f = 60.5 N 60.5 N = 75 N * cos(Θ)

    posted on June 11, 2020
  60. Physics

    the work (energy) is the difference in kinetic energy at the two speeds work = 1/2 (62 kg + 12 kg) * [(12.7 m/s)^2 - (8.2 m/s)^2] ... Joules

    posted on June 11, 2020
  61. Math

    gradient is also known as slope ... the change in y, divided by the change in x the general slope-intercept equation is ... y = m x + b ... m is the slope , and b is the y-intercept (where the line crosses the y-axis) solving the given equation for y ...

    posted on June 11, 2020
  62. mathematics

    divide by e^(kt) ... y / [e^(kt)] = y0

    posted on June 8, 2020
  63. Physics

    the ultraviolet end of the spectrum is higher energy than the infrared

    posted on June 8, 2020
  64. Physics

    the weight (force) of a 3.15 kg mass is ... 3.15 * g find the spring constant (k) by dividing the force by the extension ... (3.15 * g) / (13.40 cm - 12.00 cm) stored energy is ... 1/2 * k * x^2 ... find x ... add it to 12 for Joules , the extension is in

    posted on June 8, 2020
  65. Science

    distance and orbital velocity are inversely related the area of the orbital ellipse swept by a planet is a constant

    posted on June 7, 2020
  66. Mathematics

    draw the diagram and use the law of sines

    posted on June 7, 2020
  67. Math

    π * d * h ... is the lateral surface area

    posted on June 7, 2020
  68. algebra

    q - 17

    posted on June 6, 2020
  69. Maths

    7 * 5 = 35 ... man-days to dig hole half a hole takes 35/2 man-days (35/2) / 3 = 35/6 man-days for half a hole ... almost six days

    posted on June 5, 2020
  70. mathematics

    40 * (1 - .20) * (1 + .05)

    posted on June 4, 2020
  71. mathematics

    how many ways can you get 8? 6-2 ,5-3 , 4-4 , 3-5 , 2-6 there are 36 possible outcomes ... 6 sides * 6 sides

    posted on June 4, 2020
  72. science

    electrostatic force is an inverse-square relation 6.0 / d^2 = 15 /(2.0 - d)^2 solve for d 15 d^2 = 24 - 24 d + 6 d^2 9 d^2 + 24 d - 24 = 0 ... 3 d^2 + 8 d - 8 = 0

    posted on June 4, 2020
  73. Physics

    the ramp (frictionless) is a longer distance, but a lower effort (force) the work is the same

    posted on June 4, 2020
  74. Physics

    the gravitational force is constant over this short distance the change in gravitational potential energy (work) is ... m * g * h ... the work is negative (against gravity) FYI ... technically, the answer sig fig is the smallest of the input data ... the

    posted on June 4, 2020
  75. Physics

    how big is the loop?

    posted on June 4, 2020
  76. Mathematics

    (105º / 360º) * 2 * 6 cm * 22/7

    posted on June 4, 2020
  77. Math

    the 7 rounds up to 10 ... 1010

    posted on June 3, 2020
  78. Chemistry

    3970 g / 7.86 g/mL = ? mL 100 mL = 1 dL

    posted on June 3, 2020
  79. algebra

    angle + complement = 90º

    posted on June 3, 2020
  80. physics

    5.00E2 N * cos(29º) * 20 m = ? Joules

    posted on June 3, 2020
  81. Physics

    the centripetal force (tension in the string) ... keeps the ball moving in a circle the force necessary is ... m v^2 / r = .167 * 4.9^2 / .98 ... Newtons ... this is the tension at the sides of the circle at the top and bottom of the circle ... the weight

    posted on June 3, 2020
  82. physics

    m * g * h / t = 32 kW ... m * g * h / 32 kW = t ... seconds

    posted on June 3, 2020
  83. Maths

    let x = 3^n x^2 + 1 - (4 x + 4 + 9) = 0 ... x^2 - 4 x - 12 = 0 (x - 6) (x + 2) = 0 ... x = 6 , x = -2 3^n = 6 ... 3^n = -2 is an impossible solution n log(3) = log(6)

    posted on June 3, 2020
  84. physics

    time = distance / rate 8 km / v = 9 km / (v + 2) multiplying by [v ( + 2)] ... 8 v + 16 = 9 v speeds are ... 16 kph and 18 kph convert to m/s ... multiply by 1000 m/km and divide by 3600 s/hr

    posted on June 3, 2020
  85. Mathematics

    6 * 5/8 = ?

    posted on June 3, 2020
  86. Physics

    see Bill at 6:58 yesterday

    posted on June 3, 2020
  87. Physics

    your mass is ... 588 / g the force (391 N) accelerates your mass for 0.576 s find the acceleration ... f = m a ... a = f / m find the distance during acceleration ... d = 1/2 a t^2 find your final velocity ... v = a t time to shore = acceleration time +

    posted on June 2, 2020
  88. Algebra

    s equals zero on the ground 0 = −16t2 + 2120 16t2 = 2120 ... t^2 = 132.5 ... this is the SQUARE of the time take the square root to find the fall time

    posted on June 2, 2020
  89. Algebra

    the max is on the axis of symmetry of the parabola x = -b / 2 a = -10 / (2 * -5) = 1 1 second up, one second down ... 2 sec flight time plug one into the original equation to find max height

    posted on June 2, 2020
  90. math

    D time = distance / rate = 20 km / 10 kph = 2 hr M has covered ... 20 km - 4 km = 16 km ... in 2 hr ... 16 km / 2 hr = 8 kph M has 4 km to go ... 4 km / 8 kph = 1/2 hr

    posted on June 1, 2020
  91. Physical Science

    m * g * Δh = 80 kg * 9.8 m/s^2 * (700 m - 400 m) = ? Joules

    posted on June 1, 2020
  92. PreCalculus

    these identities are helpful cos(u) = 1 / sec(u) cos(u/2) = ± √{[1 + cos(u)] / 2} cos(u/2) = ± √({1 + [1 / sec(u)]} / 2) ​

    posted on June 1, 2020
  93. Mathematics

    h + t + u = 6 h = 2 u t = h + u ... 2 t = 6 ... t = 3 h + u = 3 ... 3 u = 3 ... u = 1 h + 3 + 1 = 6 ... h = 2

    posted on May 30, 2020
  94. Algebra

    p^4 + 4 p^3 q + 6 p^2 q^2 + 4 p q^3 + q^4

    posted on May 29, 2020
  95. physics

    hz = cycles / seconds

    posted on May 29, 2020
  96. physics

    looks good

    posted on May 29, 2020
  97. science

    bingo

    posted on May 29, 2020
  98. science

    how are plant cells different from animal cells?

    posted on May 29, 2020
  99. Algebra

    4000 * e^(rt) 4000 * e^.328

    posted on May 29, 2020