Friday
January 20, 2017

Posts by Scott

Total # Posts: 1,636

Algebra 2
use the quadratic formula to find the value(s) of x
November 2, 2016

physics
momentum is conserved (1200 * 14) + (2000 * 25) = ... (1200 + 2000) * v
November 2, 2016

Chemistry
8 half-lives 625 * (1/2)^8
November 2, 2016

Chemistry
3 half-lives m * (1/2)^3 = 6
November 2, 2016

Chemistry
2 days (48 hr) is 8 half-lives 10.0 * (1/2)^8
November 2, 2016

Chemistry
5 / 20 = 1/4 = (1/2)^2 2 half-lives
November 2, 2016

Algebra 2
3 half-lives 345 * 1/2 * 1/2 * 1/2
November 2, 2016

Need help with math
people who own both (b) will be counted in both groups (laptop owners and desktop owners) when you count all of the households, the "both" group is only counted once 130 + 30 + 50 + b = 250
November 1, 2016

Mathematics
the area is side times altitude 30 * 15 = 25 * x
November 1, 2016

Math
8 oz per cup
October 31, 2016

Science
switching the electrical polarity also switches the magnetic polarity
October 31, 2016

Science 7
switching the wires changes the magnetic polarity of the coil
October 31, 2016

algebra 2
3000 = 2000 [1 + (.038 / 2)]^(2t) ... t is the number of years 1.5 = 1.019^(2t) log(1.5) = 2t * log(1.019)
October 31, 2016

Physics
the gravitational potential energy becomes work driving the pipe m g h = f d 450 * g * 1.5 = f * .45
October 30, 2016

Math
y^2 + 5y - 6 = y^2 - 5y + 6 + 8 5y + 5y = 6 + 8 + 6
October 30, 2016

Math
(x + 2)^2 - x^2 = 44 x^2 + 4x + 4 - x^2 = 44 4x + 4 = 44
October 30, 2016

Math
28x - 7y = -119 ... add to 1st eqn
October 30, 2016

math
draw a Venn diagram of three intersecting circles enclosed in a box label the circles S, F, and G S/F/G -- 2 ... these are in all the two way intersections S/F -- 10 + (2) S/G -- 4 + (2) F/G -- 6 + (2) S -- 19 + (2) + (10) + (4) F -- 13 + (2) + (10) + (6) G -- 10 + (2) + (4...
October 30, 2016

Math
A = 3M A - 3 = 4 (M - 3) = 4M - 12 3M = 4M - 9
October 30, 2016

Math
18 r^5 = 2/27 9 r^5 = 1/27 r^5 = 3^-3 / 3^2 = 3^-5
October 30, 2016

Math Grade 9
square rooting implies that the yard is square ... from the result of your answer, this is not the case the "perimeter" in this problem, is only three sides A = L * W = 50 P = L + 2W a good investigation might consist of a table comparing L, W, and P ... remember, ...
October 30, 2016

Algebra
p + r = 18 35p + 49r = 728 solve the system by substitution or elimination
October 30, 2016

math
10 is a factor ... ?????0 The hundred thousands and ten thousands digit are the same and are odd ... must be less than 3, and odd ... 11???0 The sum of the hundreds and the thousands digits is 10 ... neither one can be zero The tens digit is a cube number and is one more than ...
October 29, 2016

Physics
the blocks accelerate at ... 60/18 = 10/3 m/s^2 the force necessary for b ... 15 * 10/3
October 27, 2016

Science
you think right
October 26, 2016

College Calculus
the max height is on the axis of symmetry of the parabola ... t = -b / 2a ... -96 / (2 * -16) ... plug into the equation to find s velocity is ds/dt ... solve for t when s is zero ... plug into the 1st derivative of s(t)
October 26, 2016

math
24 / 5 m = 30 / x m 24 x = 150
October 26, 2016

Math/7th
3 / 2 = 14 / x 3x = 28 x = 28/3 = 9 min 20 sec
October 25, 2016

physics
900 watts is 900 joules per sec 5 min is 300 sec 900 * 300 = 270 kJ
October 25, 2016

Physics
the car goes through a quarter of a circle in 10 s, at a speed of 15 m/s so the circumference of the circle is ... 10 * 15 * 4 = 600 m ... the radius is ... 600 / 2π the centripetal force (which causes the car to travel in a curved path) is ... m v^2 / r when the car is ...
October 25, 2016

Science/Physics
n = c / (.612 c) = 1 / .612
October 25, 2016

algebra
p = 94 e^(.06 * 4)
October 24, 2016

Math
suppose that 8 of Maggie's hours coincided with Gina's 8 hours that would complete 1/3 (8/24) of the project Maggie then finishes the remaining 2/3 in 22 hours (30 - 8) so Maggie would take 33 hours alone ... she does 24/33 or 8/11 working 24 hours with Gina Gina does ...
October 24, 2016

math
3S + 10 = 2L 2S + 2L = 100 3S + 10 = 100 - 2S 5S = 90
October 24, 2016

math
S + L = 50
October 24, 2016

Physics
a = 75/360 * π * r^2 da/dt = 75/360 * π * 2r dr/dt da/dt = 75/360 * π * 2 * 6 * 0.3
October 24, 2016

math please help
42 / (r + 6) = 10 / r 42 r = 10r + 60
October 24, 2016

math please help
p = f + 8 310 / p = 270 / f ... 310 f = 270 p 310 f = 270 (f + 8) 310 f = 270 f + (8 * 270) 40 f = 8 * 270
October 24, 2016

physics
1/2 m v^2 = m g h v = √(2 * 9.8 * 1.2)
October 24, 2016

Math
looking at a polar cross section Monica's radius of rotation (r) is ... 3960 mi * sin(90 - 13) her speed is ... 2 * π * r / 24 hr
October 24, 2016

Math
one half of TWO fifths is ONE fifth 1/5 * 60 =
October 24, 2016

algbebra
cd = 1 / (5 - 2) = 1/3 t = f + 6 cd t = 2f + 3 = f + 2 ... 4th = -1 ... 1st = -1 - (3 * 1/3) = -2 ... 25th = -2 + (24 / 3) = 6 s = (-2 + 6) * (25/2)
October 24, 2016

algebra
f(x) = -1 (3x + 8)^2 the graph is tangent to the x-axis ... at (-8/3,0)
October 24, 2016

physics
v^2 = .20 m * 9.8 m/s^2 this is the tangential velocity (v) divide by the radius to find angular
October 23, 2016

Physics
two forces on the ball ... tension and gravity gravity equals the vertical component of tension centripetal force is the horizontal component m v^2 / [1.75 sin(78.0º)] = ... m g tan(78.0º)
October 23, 2016

Pure Math
(x + yi)^2 = x^2 + 2xyi - y^2 x^2 - y^2 = -5 x y = 6 i would suggest a graphical solution ... try fooplot u = 2 + 3i
October 23, 2016

physics
d = 1/2 * a * t^2
October 23, 2016

Maths GRE
TOTAL price ... 3200 + 1800 % options ... 1800 / (3200 + 1800) * 100%
October 23, 2016

Algebra
because of the absolute value ... 2x-8 = 18 ... AND ... 2x-8 = -18
October 23, 2016

Phyics
the centripetal force is ... 42/56 g v^2 / 250 m = 42/56 * 9.8 m/s^2 this is the tangential velocity if you want rpm, multiply by 60 (sec to min); and divide by the station circumference
October 23, 2016

math
d = 1/2 a t^2 = 1/2 * 2.14 * 1.79^2
October 23, 2016

physics
the mass is not a factor (8.5 * r)^2 / r = .89 g r = .89 g / (8.5^2)
October 23, 2016

Physics
momentum is conserved in both the x and y directions the initial momentum is all in the x direction -- the moving ball PMy = 3.0 m/s * sin(60º) * 1.2 kg BVy = PMy / 7.2 PMx = 3.0 m/s * cos(60º) * 1.2 kg BVx = 3.5 - (PMx / 7.2) use Pythagoras to find BV
October 22, 2016

Physics
M1V1 = M2V2 ... M1^2 V1^2 = M2^2 V2^2 5 M1 V1^2 = 4 M2 V2^2 5 M1^2 V1^2 / M1 = 4 M2^2 V2^2 / M2 5 / M1 = 4 / M2 M2 / M1 = 4 / 5
October 21, 2016

Precalc
Ac = c^2 / 4 π triangle perimeter = Pt = 100 - c At = [Pt / (2 + √2)]^2 / 2 ... = (Pt)^2 / (12 + 8√2) ... = (1E4 - 200 c + c^2) / (12 + 8√2) A = (c^2 / 4π) + ... [(1E4 - 200 c + c^2) / (12 + 8√2)] the minimum A lies on the axis of symmetry...
October 21, 2016

algebra
x y = 6 * 3 = 18 2 y = 18
October 21, 2016

math
divide 2nd by -2 ... x = 103 + 5y subtract 5y ... x - 5y = 103 they are the same line
October 21, 2016

science
the speed of sound in air is ... 375 yd/s (approx) the speed of light is relatively instantaneous 3 * 375 = ?
October 21, 2016

physics
a) 15.9 / g = 15.9 m/s / 9.8 m/s^2 c) time up equals time down ... twice a) e) time from c) times 18.0 m/s
October 21, 2016

Math
the one with the exponent between the two
October 21, 2016

Math
let a = 22 / kg, and b = 12 / kg a + b = 20 kg 22a + 12b = 15 * 20 12a + 12b = 240 10a = 60
October 21, 2016

math
b / 12 = 75 / b b^2 = 900
October 20, 2016

chemistry
the two reactants react in equal amounts to give two products in equal amounts let x = concentration of each product Kc = 0.85 = [x]^2 / [1.00 - x]^2 .85 - 1.7 x + .85 x^2 = x^2 .15 x^2 + 1.7 x - .85 = 0 use quadratic formula to find x moles = concentration * vessel size
October 20, 2016

Precal
10^-2 = 3x + 5 -4.99 = 3x
October 20, 2016

algebra
200 (1 + .20)^3
October 20, 2016

physics
the weight is not a factor 1/2 m v^2 = m g h v = √(7 g)
October 20, 2016

Algebra
3.3E10 = 4.069E6 (1 +.026)^y log(3.3E4 / 4.069) = y log(1.026)
October 20, 2016

Science
the volume of water is ... π * 12^2 * 3 m^3 a cubic meter (m^3) of water has a mass of 1000 kg (a metric ton) the weight is the mass multiplied by the gravitational acceleration ... g = 9.8 m/s^2 the weight is in Newtons -- a unit of force
October 19, 2016

physics
s.h. = 4186 4186 * 2 * 75 = 627900 rounding or sig fig?
October 19, 2016

algebra
3^3 * (a^2)^3 = 27 a^6
October 19, 2016

physics
momentum is conserved the speed is zero
October 19, 2016

physics
the mass is not a factor horizontal speed = Sh = S cos(54.5) the flight time to the basket is ... 10.4 m / Sh = 10.4 * cos(54.5) / S vertical speed = Sv = S sin(54.5) gravity slows the vertical speed to zero at the peak, halfway through the flight Sv / g = 1/2 * 10.4 / Sh S...
October 19, 2016

math
(1.05^7 - 1) * 100%
October 19, 2016

math
a. 4000 = A [1+(.104 / 365)^(11 * 365) b. 4000 = A e^(.104 * 11)
October 19, 2016

physics
a) after 1 s the vertical velocity is 2 m/s ... so the average velocity is 7 m/s for the 1st sec b) similar to a) ... the object reaches its peak after 1.2 s ... the average velocity is 6 m/s c) time up equals time down ... 1.2 + 1.2
October 19, 2016

physics
time up equals time down h = 1/2 g t^2 = 4.9 m/s^2 * (2 s)^2
October 19, 2016

physics
60 = 1/2 k x^2 x = √(120 / 460)
October 18, 2016

physics
1/2 k x^2 = 1/2 m v^2 k = m v^2 / 4.5^2 convert 60 km/hr to m/s and calculate
October 18, 2016

Arithmetic progression
10 is not correct ... the 10th term is 23 the difference between terms is 2 27 is (5 + 22) ... the 1st term plus 11 differences ... 27 is the 12th term
October 18, 2016

math
57 (60 - 3) are M, E, or ME ... E + M + ME = 57 ... E + M = 48 M + ME = 2 (E + ME) ... M + 9 = 2E + 18 ... M = 2E + 9 substituting ... E + 2E + 9 = 48 ... E = 13 (i) M + ME (ii) E + ME (iii) M (iv) E
October 18, 2016

Physics
he has a constant velocity (zero acceleration) so the net force on him is zero the frictional force must equal his weight
October 18, 2016

algebra
(4y + 1i)(4y - 1i)
October 18, 2016

Physics
if his last turn is to the south he will be 70 m S and 12 m W of his starting position use Pythagoras to find the displacement
October 18, 2016

GENERAL PHYSICS
100 * 2π / 60 / 2 sec
October 18, 2016

math
36 / 47 = x / 120
October 18, 2016

Chemistry
mole = 6.02E23 particles 5.43E24 / 6.02E23
October 18, 2016

math help
1/2 * b * h = 10 b = h + 1 substituting ... h^2 + h - 20 = 0 (h + 5)(h - 4) = 0 h - 4 = 0
October 18, 2016

Physics
A) 2 * 7 * 10 N to the left B) 2 * 1/2 * 10 * 7^2 J C) the PE from B is converted to KE ... v = √[2 * B / m]
October 18, 2016

math
a = 2 pt, b = 4 pt, c = 5 pt a + b + c = 28 2a + 4b + 5c = 100 a = 2c 2a + 2b + 2c = 56 ... substituting ... 3a + 2b = 56 4a + 8b + 10c = 200 ... substituting ... 9a + 8b = 200 subtract the equations (after multiplying) to eliminate b
October 18, 2016

Physics
a faster stop (because concrete is hard) means a greater impulse
October 18, 2016

physics
the ball's speed is being converted to gravitational potential energy 1/2 m 6.4^2 = ... m g (2.2 - 1.5) + 1/2 m v^2 6.4^2 = 1.4 g + v^2
October 17, 2016

Math
s + b + w = 42 s = 4b 3s + 2b + 1.5w = 102 substituting ... 5b + w = 42 ... 14b + 1.5w = 102
October 16, 2016

Math
2 ft^3 = 2 * 12 * 12 * 12 in^3 24 * 144 / 231
October 16, 2016

phy 101
momentum is conserved so they "trade" velocities
October 16, 2016

Math
64, 32, 16, 8, 4, 2, 1, 1/2
October 16, 2016

Physics
a. weight = mass * g b. normal force equals weight ... but in opposite direction c. Newton's 2nd law ... f = m a ... in this case ... a = f / m d. correct
October 16, 2016

Chemistry
molar mass of acetone ... 58.08 g moles of acetone ... 1.920 / 58.08 molar enthalpy is energy per mole
October 15, 2016

Physical science
(A) m g h = 15 m g (B) m g h = 1/2 m v^2 ... v = √(2 g h) = √(30 g)
October 15, 2016

Math
it takes 12 min (the LCM of the numbers) divide by their rates to find the number of laps
October 15, 2016

Math 1105
yes
October 14, 2016

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