Saturday
December 10, 2016

Posts by Scott

Total # Posts: 1,574

Chemistry
you are correct
November 12, 2016

Maths
eight "3" cards gives 24 ... 7 shy of 31 replace four "3" cards with three "5" cards and a "4" card
November 11, 2016

Physics
d = 1/2 a t^2 t = ?(2 * d * a)
November 11, 2016

Physics
the period (of the pendulum) is dependent on the length the speed of the "bob" is not a factor
November 11, 2016

math- Trigonometry
looks good...TALL lighthouse
November 11, 2016

Chemistry
.325 L * .05 M/L * 55.8 g/M
November 11, 2016

Math
time is inversely proportional to the number of machines and directly proportional to the number of raviolis t = 15 min * 15/75 * 6000/500
November 11, 2016

science
would call this a "trick" question circular path means radial (centripetal) acceleration there is no tangential component
November 11, 2016

Math
d = 6 233 - 53 = 180 ... so, 31 terms s = (233 + 53) * 31 / 2
November 10, 2016

Physics
1 kcal = 4184 joules m g h = 300 * 4184 h = (300 * 4184) / (1000 * g)
November 10, 2016

Physics
the gravitational potential energy becomes kinetic energy m g h = 1/2 m v^2 v = ?(2 g h)
November 10, 2016

Physics
20º is 1/18 of a circle (20/360) the length of the arc is ... 1/18 * 2 * ? * 1 m
November 10, 2016

Physics
momentum is conserved the smaller mass is 1/3 of the larger ... so it must have 3 times the speed
November 10, 2016

Math
check the related questions
November 10, 2016

Physics
f = m a ... a = f / m a = (33 - 12) / (6 + 15)
November 10, 2016

physics
time up equals time down h = 1/2 g t^2 = 1/2 * 32 ft/s^2v * (2 s)^2
November 10, 2016

math
the x-coordinate doesn't change the sign of the y-coordinate is reversed drawing a picture can help
November 9, 2016

Math
complex roots (zeros with i) occur in conjugate pairs f(x) = (x-6+3i)(x-6-3i)(x^5)
November 9, 2016

math
i = 7400 * [1 - (1 + .06/4)^(4*4)]
November 9, 2016

algebra
try again on the 1st one the slope formula does work
November 9, 2016

physics
the frictional force is ... 5 * 9.8 * .4
November 9, 2016

Physics: Centre of Mass
(4 * 4) + (8 * 5) > 7 * 5 ... so the CM is > 0 [4*(4-x)]+[5*(8-x)]-[7*(5+x)] = 0
November 8, 2016

Math
Tom has a 40 km head start ... 80 km/h * .5 h Cindy is catching up at 20 km/h ... 100 km/h - 80 km/h
November 8, 2016

Physics
the velocity is the vector sum of the horizontal and vertical components horizontal ... 88 m / 3.8 s vertical ... time up equals time down ... (3.8 s / 2) * 9.8 m/s^2 the max height is half the initial vertical component, multiplied by half the flight time
November 8, 2016

Math
distributing the 10 ... 40x + 30 - 9x
November 8, 2016

Math
undefined slope means the line is vertical the equation is of the form ... x = ?
November 7, 2016

Physics
a = v^2 / r r = v^2 / a = (54 m/s)^2 / 90 m/s^2
November 7, 2016

Physics
the object is moving at 20 m/s when the force is removed, the object will be decelerated to a stop (over some distance) by friction find the frictional force (m * g * .2) find the deceleration ... a = f / m find the stopping time ... t = v / a = 20 / a find the stopping ...
November 7, 2016

pre-calc.
100 = 10^2 10 = 10^1 logarithms are exponents -- powers of some base regardless of the base, the logarithm of 100 will always be twice the logarithm of 10
November 7, 2016

Pre-Calc
the values for sine and cosine are limited to the range ±1
November 7, 2016

physics
h = 1/2 g t^2 40 = 1/2 * 9.8 * t^2
November 6, 2016

Physics
gravity follows an inverse square relation two radii above the surface is three times the distance from the center (of mass) to the surface so the force would be ... g / (3^2)
November 6, 2016

physics
Pi * Vi / Ti = Pf * Vf / Tf the T is absolute (Kelvin) temperature
November 6, 2016

physics
you're adding two vectors 2^2 + 4^2 = s^2
November 6, 2016

Physics
need the drawing for a solution or, at least, more data
November 4, 2016

Physics
(b) f = m a ... a = f / m = 900 / 1800 a = .5 m/s^2 so it takes 40 s to stop ... 20 / .5 ave velocity is ... (20 + 0) / 2 distance = v * t
November 4, 2016

Algebra
.12 x + .10(7500 - x) = 890 .02x + 750 = 890
November 3, 2016

Science Psysics
the gravitational potential energy at the top of the ramp becomes kinetic energy at the bottom of the ramp (minus the work done by friction) m g h - f d = 1/2 m v^2 [6 * 9.8 * 3.5 sin(31º)] - (17 * 35.) = 1/2 * 6 * v^2
November 2, 2016

Algebra 2
x^2 - 8x + 14 = 0 use the quadratic formula to find x x = {8±?[64-(4 * 1 * -14)]} / (2 * 1)
November 2, 2016

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

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