Wednesday
August 20, 2014

Posts by Damon


Total # Posts: 17,938

math
surface area = 4 pi r^2 so dv/dt = 4 pi r^2 dr/dt dv/dt = 75 cm^3/s so dr/dt = 75/(4 pi r^2) when r = 5 dr/dt = 3/(4 pi) = .75/pi cm/s after 60 seconds volume = 75*60 = 4500 cm^3 (4/3)pi r^3 = 4500 pi r^3 = 3375 r = 15/pi^(1/3) r^2 = 225/pi^(2/3) 4 pi r^2 = 900 pi^(1/3) dr/dt...
March 27, 2014

social study
http://gloucester-ma.gov/index.aspx?nid=649
March 27, 2014

social study
here's one here: http://wgbhnews.org/post/wind-turbines-power-gloucester-city-buildings
March 27, 2014

Calculus
huh?
March 27, 2014

Calculus
x = ln 243 y = ln 32 LET Z = e^((3x + 4y)/5) ln [z ]= (3x+4y)/5 ln z = (1/5)( 3 ln 243 + 4 ln 32) = ln (243^3/5 *32^4/5) = ln (27*16) = ln(432) if ln z = ln 432 then z = 432
March 27, 2014

physics
v = Vi -7.1 t 0 = 43 - 7.1 t t = 43/7.1 = 6.06 s average speed during stop = 7.1 /2 =3.55 m/s d = 3.55 * 6.06 = 21.5 m
March 27, 2014

Physics Help
Pairs of forces probably refers to Newton's third law, for every force there is an equal and opposite force.
March 27, 2014

Physics Help
Impulse is mass times change in velocity because Force * time = change of momentum = change of m v = m * change of v if m is constant
March 27, 2014

physics
potential energy of each at start = k q^2/r at large distance that energy is kinetic so (1/2)m v^2 = k q^2/r
March 27, 2014

Chemistry
ml ranges from -L to +L If L = 0, ml = 0
March 26, 2014

Chemistry
4 is out because with L = 0 you have no choice of ml = 1. wtih L = 0 ml = 0 and spin can be 1/2 or -1/2 ml = 1 is not allowed if L = 0
March 26, 2014

Chemistry
3) is out, spin is =/- 1/2 1) is out, negative L 2) is out , biggest L is n-1 or 2 4) is out, with L=0 you only have +/- 1/2 for spin, no ml - 1 5) looks possible 6) looks possible
March 26, 2014

Alegbra
You are welcome :)
March 26, 2014

Alegbra
Yes, right :)
March 26, 2014

Alegbra
LOL -1/3 = -0.33333333333333333
March 26, 2014

Alegbra
It would really help you if you sketched these points on a graph, or at least the x values on a number line.
March 26, 2014

Alegbra
from G to H x goes from 3 to -2 or -5 easier for me to go (1/3) of 5 from H to G so -2 + 5/3 which is -6/3 + 5/3 or x = -1/3
March 26, 2014

Alegbra
You are welcome.
March 26, 2014

Alegbra
Hailey to find something halfway in between, just take the average which is the sum divided by two
March 26, 2014

Alegbra
If you men the earlier question I gave you both x and y of the point. Y is 1/2
March 26, 2014

Math
prob that next one is above 75 = .6 prob that the one after that is independently .6 again so probability of both = .6*.6 = .36
March 26, 2014

math
(2/5) * 50 = 20 tigers (1/5) * 50 = 10 leopards sum = 30 so 50 - 30 = 20 lions
March 26, 2014

Math
yes
March 26, 2014

Math
3.3636... > 3.3333...
March 26, 2014

math
x = 38 + 5 t y = 30 + 7 t when does x = y? 38 + 5 t = 30 + 7 t 2 t = 8 t = 4 hours
March 26, 2014

statistics
18 + 24 = 42 first black sock = 24/42 second black sock = 23/41 product = 24/42 * 23/41 = .321
March 26, 2014

3rd grade math missing info
Need one more fact, like how much did they spend together or how much did Luis spend.
March 26, 2014

Calculus
dp/dt = v = 2 t at t = 2 v = 2*2 = 4
March 26, 2014

Alegbra
yes
March 26, 2014

Alegbra
I gave you x and y y is 1/2
March 26, 2014

Alegbra
average x = (5-1)/2 = 2 average y = (-2+3)/2 = 1/2 so (2 , 1/2)
March 26, 2014

*****Help Statistic
ell, I will just do the problem a yes p(right) = .5, (1 -pright)=.5 b half of them, 5 10 trials p(k) = C(n,k) p^k (1-p)^(n-k) p(6)=C(10,6) .5^6 .5^4 =210*.015625*.0625 = .205 p(7) = 120*.5^7*.5^3 = .117 p(8) = 45*.5^8 *.5^2 = .044 p(9) = 10*.5^9*.5 = .0098 p(10) = 10*.5^10 = ....
March 26, 2014

Ms. Sue please help
SORRY, DID NOT READ THAT PERPENDICULAR WORD.
March 26, 2014

Ms. Sue please help
A (-8, -4) and B (1, -5) SLOPE = (-5 - -4)/ (1 - -8) = (-5+4)/(1+8) = -1/9 F(3,7) and G (-4, -5) SLOPE = (-5 -7)/(-4-3) = 12/7 H(-1, 0) and I (4, 6) SLOPE = (6-0)/(4 - -1) = 6/5 NOT PARALLEL AND NOT PERPENDICULAR y=4x-3 AND (2,3) 3 = 4(2) + b b = -5 SO Y = 4 X - 5
March 26, 2014

Equations Help
I decline to answer on the grounds that you can figure that out.
March 26, 2014

Equations Help
b^2-4ac = 4 + 20*12 positive so two real roots b^2-4ac = 324 -4(3)(27) = 324-324 = 0 so two identical real number roots (the graph just grazes the x axis)
March 26, 2014

American History
None of them really. http://www.huffingtonpost.com/matthew-pearl/top-five-myths-about-edga_b_334742.html
March 26, 2014

Social studies check answers ***damon***
You are welcome
March 26, 2014

Social studies check answers ***damon***
1. I have no idea. 4. A) yes 5. B) yes 6. C) yes 8. C) yes
March 26, 2014

math
7.5 * 50
March 26, 2014

American History
a is wrong b is true c wrong, started 1865 d geography is wrong or railroad is wrong :) http://railroad.lindahall.org/essays/brief-history.html
March 26, 2014

Maths
if you mean the sequence in your previous problem a = -5 -123 = 17 - 5n n = 28 or 28 terms before our first term which was 17
March 26, 2014

Maths Missing the sequence
You can not copy and paste here.
March 26, 2014

American History
http://millercenter.org/president/johnson/key-events Civil Rights Act
March 26, 2014

Algebra inequality missing
If you tried to copy and paste, that does not work here.
March 26, 2014

Maths
a = (2x+4) - (4x+1) = -2x + 3 and a = (x+3) - (2x+4) = -x - 1 so 2x-3 = x+1 x = 4
March 26, 2014

Calculus
I did one for you. Now you do this one. By the way you left the half life of carbon 14 or exponential decay function out of your statement of the problem making it impossible without looking that up.
March 26, 2014

Calculus
12 = 40 e^(-kt) .3 = e^-30 k ln .3 = -30 k -1.20 = -30 k k = .04013 so .5 = e^-.04013 t -.6931 = -.04013 t t = 17.3 years
March 26, 2014

physics
h = (1/2) g t^2
March 26, 2014

Math
1 mile (5280 ft/mile)(1 yard/3 ft) = 1760 yards so 1 square mile = (1760)^2 = 3,097,600 yd^2 3,097,600 yd^2 * 1 day/4840 yd^2 = 640 days 640 days * 1 year/365 days = 1.75 years
March 26, 2014

science
H2O2(g)+2CO(g) ----> H2(g)+2CO2(g) so ?
March 26, 2014

Math
2/12 or 1/6 cup leaks out so 11 5/6 are left 11 5/6 = 69/6 (69/6)/4 = 69/24 = 2 21/24 = 2 7/8 each
March 26, 2014

geometry
infinite number even if no curvy tops If it is rectangular then x^2 h = 28 h = 28/x^2
March 26, 2014

phy113
assuming 100 degree steam slope = (242 -22.8) /(100 -0) = 2.19 mm/degree so 22.8 + 2.19(20) = 66.6 mm
March 26, 2014

Quick Math Question
You are welcome.
March 26, 2014

Quick Math Question
3 ln x = ln x^3 ln x^3 + ln|x+1| = ln [x^3(x+1)] = ln [x^4 + x^3]
March 26, 2014

physics
no motion in direction of force ----> no work done
March 26, 2014

physics!!!!!
Ac = v^2/R at bottom T = tension in rope T = m g + m v^2/R 28 = 1.8(9.81) + 1.8 v^2/1.55 10.34 = 1.16 v^2 v = 2.98 m/s at top if T = 0 then g = v^2/R 9.81 = v^2/1.55 v = 3.9 m/s
March 25, 2014

Rosaline have you got it ?
If you are still stuck, look at the graphs Steve linked you to carefully and see three areas between the curves on the x axis. Those are values of x where your original function is between the limits. The last area on the right is not feasible because the width would be ...
March 25, 2014

ALGEBRA
go back to where Steve is helping you as well and look at the graphs. Watch out though, the third region makes the box higher than half the width so will not work.
March 25, 2014

ALGEBRA
I did the two equations at the limits and said look between them
March 25, 2014

ALGEBRA
I set them equal to 1512 and then to 2176 THEN I subtracted 1512 from the first both sides AND I subtracted 2176 from the second both sides PLEASE calm down and think
March 25, 2014

algebra
By intervals he means BETWEEN the zeros of the two functions
March 25, 2014

algebra
the plate is only 25 cm wide so the big x interval will not work I got results in the middle of the first two intervals though
March 25, 2014

algebra
http://www.jiskha.com/display.cgi?id=1395791951#1395791951.1395793571
March 25, 2014

algebra
Look at my last reply to you
March 25, 2014

math
It is two functions and there are three regions where they cross the x axis Any x between the curves on the x axis should work. However the third region on the right has too big an x so the width will come out negative however when I tested in the middle of the first two ...
March 25, 2014

math
Oh well 4 x^3 - 130 x^2 + 1000 x = 1512 is the same as 4 x^3 - 130 x^2 + 1000 x - 1512 = 0
March 25, 2014

math
ok, I tried x = 3 and it works now for x = 7 which is between those last roots 7(40-14)(25-14) = 7*26*11= 2002 so that region also works
March 25, 2014

math
then: http://www.solvemymath.com/online_math_calculator/algebra_combinatorics/polynomial_calculator/polynomial_roots.php I get 21.85, 2 and 8.65 and 22.4 4 and 6.06 well x between 2 and 4 works 21 and 22 are too big you might try between 8.65 and 6.06
March 25, 2014

math
use http://www.webmath.com/_answer.php to get 4 x^3 - 130 x^2 + 1000 x or just FOIL the last two and multiply by x Then 4 x^3 - 130 x^2 + 1000 x -1512 = 0 and 4 x^3 - 130 x^2 + 1000 x - 2176 = 0
March 25, 2014

Phys
10 = x * 1.6*10^-19 10 * 10^19 = 1.6 x x = 6.25 * 10^19 well, quite a few, but less than a mol (6*10^23)
March 25, 2014

Physics
Been there, done that scroll down .
March 25, 2014

Physics
well if you started out with everything neutral and one got negative then the other got positive (the rod stole electrons from the wool, becoming negative. That left the wool with an excess of protons, becoming positive)
March 25, 2014

physics
tan Theta = 50/100 Theta = 26.6 degrees
March 25, 2014

math
1 kilogram = 1000 grams so we have 1000 + 600 = 1,600 grams or 1.6 kilograms
March 25, 2014

math
the hour hand moves from 6 to 7 in one hour It will not be half way between until 6:30 So it is still closer to 6
March 25, 2014

Oh - I bet this is the problem
http://www.jiskha.com/display.cgi?id=1360959210
March 25, 2014

math
If the state department of transportation says so, we are supposed to believe it.
March 25, 2014

Trig Identities
If hypotenuse is 1 opposite = sin T adjacent = cos T 1^2 = (sin T) ^2 + (cos T)^2 as we know and sin^2 T = 1 - cos^2 T sin T = +/- sqrt (1-cos^2 T) well, that is not much of an identity if the sign is arbitrary. BUT if we use the negative root then we know that cos^2 T is ...
March 25, 2014

Algebra
L = w+5 2 L + 2 w = 66 or L + w = 33 so w + 5 + w = 33 2 w = 28 w = 14 etc
March 25, 2014

chemistry
yes 1 Ba , 2 H , 2 O
March 25, 2014

Oh, sorry
I did not read carefully.
March 25, 2014

chemistry
Google it eg http://www.webqc.org/balance.php?reaction=BAO+%2B+H2O+%3D+BA%28OH%292
March 25, 2014

physics 1
Hey, wait a minute. If there were no gravity it would have taken less time to stop. The total force up including gravity = change of momentum so there is no change to the force in part b due to gravity.
March 25, 2014

physics 1
force = rate of change of momentum = 88.1*3.53 / .00356 = 87,358 N = 88.1*3.53/.199 = 1,563 N with gravity add 88.1*9.81 = 864 N
March 25, 2014

Geometry
x = (-2 + -3) /2 = -5/2 = -2.5 y = (1+2)/2 = 1.5 so ( -2.5 , 1.5 ) (which you could see on a quick sketch)
March 25, 2014

algebra
point at (0,1) then right 1 and down 4
March 25, 2014

Physics
gain in energy = m g h = 1.2 * 9.81 * 34.2 = 403 Joules 403 = (1/2) m v^2 + (1/2)I omega^2 I = m r^2 = 1.2 (.09) = .108 omega = v/r = v/0.3 so 403 = (1/2)(1.2)(v^2) +(1/2)(.108)(v^2)/.09 403 = v^2 ( .6 + .583) v = 18.5 m/s I agree with you
March 25, 2014

physics
initial momentum = 1000 m final momentum = 910(m-1,000) + 10^7 90 m = .091*10^7 + 10^7 = 1.091*10^7 m = 121,222 kg
March 25, 2014

algebra
(x-0)(x-7)(x+4)(x-5) = 0 (x^2 -7x)(x^2-x -20) = 0 x^2(x^2-x-20)-7x(x^2-x -20) = x^4 -x^3 - 20 x^2 - 7x^3 + 7x^2 + 140 x = x^4 - 8 x^3 - 13 x^2 + 140 x
March 24, 2014

Physics( Explain and choose right answer)
The tension is smallest at the top, if the speed is in fact enough to make the top without the tension going to zero. At top: Tension + m g = m v^2/R tension = m (v^2/R - g) if the centripetal acceleration is not greater than g, the rope goes slack.
March 24, 2014

Physics( Explain and choose right answer)
actually speed rather than velocity because directions are opposite.
March 24, 2014

Physics( Explain and choose right answer)
initial momentum = 0 so final momentum = 0 0 = 3*Vcat + 1.5*Vcardboard so Vcardboard = 3 Vcat/1.5 = 2 Vcat
March 24, 2014

4th grade math
(3/4)8 = 3 (2) = 6
March 24, 2014

History 8th
Yorktown, Virginia
March 24, 2014

Treaty of Paris, quick question, thanks! ☺
Britain had little choice. That is what it was all about.
March 24, 2014

Math
(24 b/ 10 s) (60 s/ min) (3 min) = 432 b
March 24, 2014

math
1.0/2 = 0.5
March 24, 2014

Treaty of Paris, quick question, thanks! ☺
Sign tied to the rock wall in front of my house says "We miss Bobby"
March 24, 2014

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