# 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

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)]

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?

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)

-7 < x < 4

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

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

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

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

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

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 * ?

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

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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