Sunday
January 22, 2017

Posts by Damon

Total # Posts: 28,846

Geometry
change in x = -15 change in y = -1 distance = sqrt(225+1) = sqrt(226)
October 17, 2016

typo
I mean .131/16 = .008 mols O
October 17, 2016

Science (Chemistry) Ratio of mole
If you had used mols O you would have had .13/.16 = .008 or two mols of O for every one of Mg so it would have been MgO2 anyway :)
October 17, 2016

math
L + w = 42 L + 3 = 4 w 42 - w + 3 = 4 w 5 w = 45 etc
October 16, 2016

Physics
normal force = m g cos 30 so friction force </= mu m g cos 30 can only say less than if object is not moving. component of weight down slope = m g sin 30 so if no other forces are acting m g sin 30 </= mu m g cos 30 or mu >/= tan 30
October 16, 2016

Math
maybe 1002001 ? That is a lot of km 2000 km / (35 + 48 + 45.5) = 15.56 km/L = 6.43 L/100 km
October 16, 2016

physics
http://www.physicsclassroom.com/class/sound/Lesson-5/Closed-End-Air-Columns
October 16, 2016

Physics Force and Friction question
max static friction force = .4*981 which is more than 350 so It stays in place. 350 N might be enough to keep it moving, but is not enough to start it.
October 16, 2016

need more info
Is it barely not moving, is it moving at constant velocity, is it accelerating?
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
A = 3 x + 59 + 2*35 = 3x + 129
October 16, 2016

physics
oh my, still in feet? in this case g = about 32 ft/s^2 v = 58 - 32 t at top t = 0 t at top = 58/32 seconds total time in air by the way = 2 t = 58/16 seconds now the problem: h = Vi t - .5 * 32 t^2 H = 58 (58/32) - .5 * 58^2/32 (A.) H = 58^2/64 ft (B.) 2 t = 58/16 sec when h...
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
ah 4 8 16 32 64
October 16, 2016

Math( 7th grade advanced math so 8th grade math)
4*2^n n = 4 quarters of and hour 2^4 = 16 so 4*16 = 64
October 16, 2016

Science/Math
If it did not float then 5 mL
October 16, 2016

Math
well, I am inclined to multiply first equation by 4 and second by 3 -56 x + 60 y = 12 +63 x - 60 y + 30 ------------------- add 7 x = 42 so x = 42/7 then -14(42/7) + 15 y = 3 -84 + 15 y = 3 15 y = 87 y = 87/15 ========================= try that in the second one to check 21(42...
October 16, 2016

Social Studies
Just for fun: http://www.nationalgeographic.com/travel/top-10/ancient-highways/ http://www.bbc.com/news/magazine-33291373
October 16, 2016

Social Studies
Did historical Japan have good roads? Did the Incas? How were each governed? How did they communicate with other nations?
October 16, 2016

Math
g = number of girls 5g/7 = number of boys g - 5g/7 = 120 2g/7 = 120 g/7 = 60 g = 420 then boys = (5/7)420 = 300 and 420 + 300 = 720 total
October 16, 2016

chemistry
Do you mean in catalytic converter? Maybe read "types" section in here: http://en.wikipedia.org/wiki/Catalytic_converter
October 16, 2016

Math
using common denominator of 18: 10/18 , 7/18 and 9/18 Now you rearrange them.
October 16, 2016

physics
2.9*9.81 Newtons
October 15, 2016

chemistry
A certain wavelength or frequency corresponds to a certain photon energy which is a certain change of energy of the electron shell around the atom. In other words the frequency tells you how an electron orbit changed.
October 15, 2016

calculus
dh/dt = -9.8 t + 10 when t = 1 dh/dt = 10-9.8 = 0.2
October 15, 2016

math
x y change in y/change in x which is slope -2 9 ****** -5 -1 4 ****** -5 0 -1 ****** -5 1 -6 ****** -5 2 -11 hmmm, constant slope = -5 y = -5 x + b 9 = -5 (-2) + b 9 = 10 + b b = -1 so y = -5 x -1 answer check at last point -11 = -5(2) -1 -11 = -10 - 1 yes, good
October 15, 2016

Cousino
speed upstream = 8 - u speed downstream = 8 + u time upstream = 5/(8-u) time downstream =5/(8+u) so 5(8-u) + 5/(8+u) = (4/3) hr 5(8+u) + 5(8-u) = (4/3)(64-u^2) 15(8+u) + 15(8-u) = 256(64-u^2) etc, solve quadratic
October 15, 2016

be careful with parentherses
do you mean 1/(2a) or (1/2)a 1) f(-2) = 4 a^2 +2a + 3b = 4 a^2-b+8 f(-3) = 9 a^2 +3a + 3b = 7a^2-b+14 so 2 a + 3 b = - b + 8 2 a + 4 b = 8 a + 2 b = 4 or a = 4 - 2 b and then 2 a^2 + 3 a + 4 b = 14 2(16 - 16 b +4b^2) + 3(4-2b) +4b=14 32 -32b +8b^2+12 -6b +4b = 14 30 + 8b^2 -...
October 15, 2016

physics
v = velocity up = 30 sin 30 - 9.81 t u = velocity horizontal = 30 cos t if t = 1 v = 15 - 9.81 u = 30(.866) speed = sqrt (u^2+v^2) tan angle up = v/u
October 15, 2016

math
as y--->0 cos y = 1 - y^2/2 + ........ numerator: 2 - 1 +(1/2)(9)x^2 -1 +(1/2)(16)x^2 0 + (25/2)x^2 oh my now divide by x 25 x/2 goes to 0 as x goes to 0
October 15, 2016

math
by the way tangent of small angle approaches sine of that small angle :) theta + theta^2/2 .......
October 15, 2016

math
Hey, I did the other one, try series approach on this one too.
October 15, 2016

math
m = math only s = science only b = both = 10 31 = m + b = m + 10 so m = 21 s+b = 36 - m s + 10 = 36 - 21 s + 10 = 15 so = Answer all science students s = 5 only science ======================== check 21 + 10 = 31, yes all math students 5 + 10 = 15 , yes all science students 21...
October 15, 2016

Pre-calculus
This is what it is about: http://www.youtube.com/watch?v=zw0waJCEc-w sin 45 = (1/2)sqrt 2
October 15, 2016

Pre-calculus
well, 7 = 6 + 1 so it is really sin (6 pi/12 + pi/12) sin(a+b) = sin a cos b + cos a sin b (just like your other problem) sin 6 pi/12 = sin 90 = 1 cos pi/12 = cos 15 deg cos 90 = 0 so cos 15 degrees
October 15, 2016

Math
y = k/x^3 new y = k/(x/2)^3 = 8 k/x^3 8 times as big
October 15, 2016

english
I have made 100 ship models in my life. I had made 100 ship models when they told me to stop and start doing physics problems.
October 13, 2016

Maths
9 km/(3/2)hr = 18/3 = 6 km/hr
October 13, 2016

Math- Please check my answer!
6/8 = 60/80 8/10 = 64/80
October 13, 2016

Math
2 driveways/day * 5 d/w = 10 driveways/week 10 driveways/week * 50 work weeks/yr = 500 driveways/year Now as Myah said, what is the question?
October 13, 2016

physics
heat of fusion * 150 g + 150 * heat capacity* (T-0) = 300 * heat capacity*(50-T)
October 13, 2016

Physics
normal forces 5 kg block: 5(9.81) 10 kg block 5*9.81 and 15*9.81 forces 5 kg block .2 * 5 * 9.81 right T left no acceleration so T = .2 * 5 * 9.81 = 9.81 N (answer to part C by the way) 10 kg block T left .1 * 15 * 9.81 left 45 N right so 45 - 9.81 - .1*15*9.81 = 10 a the end
October 13, 2016

physics
h = 1 = (1/2)(9.81)t^2 (a)solve that for t, the fall time u t = 1.5 (b)so u = 1.5/t v = g t = 9.81 t speed = sqrt (u^2+v^2) tan angle below hor = |v|/u
October 13, 2016

8th Grade Math
y = k x -12.5 = 50 k -25 = 100 k k = -1/4 y = -x/4 y = - (47/4) / 4 = - 47/16
October 12, 2016

math
(5)(3/13) - 2(10/13) = -5/13 You better stay away from this game. There are 13 cards in each suit of which 3, the jack, queen and king are winners. The other 10, ace through 10, are losers
October 12, 2016

Physics
If it is moving to the left, the frictional force is pushing right. 0.6 * 90 * 9.81 yes, looks about right but stick to 3 significant figures.
October 12, 2016

algebra
(0,13) (13,0) and (0,0) completes triangle that is half a 13 by 13 square area = 169/2
October 12, 2016

environmental science
Ah, almost but your understanding of feedback is backwards. Negative feedback means the output is fed back and inhibits further growth in the output, stable Positive feedback means the output is fed back and INCREASES growth in the output, UNSTABLE. This is what they are ...
October 12, 2016

environmental science
well, I guess natural gas is higher quality than most of what you find in a landfill :) It all depends on their definition of "near" the surface though.
October 12, 2016

History
LOL - yes, stamps and tea are different from each other.
October 12, 2016

Physics
total energy at top = (1/2)(1530)(36) + 1530(9.81)(115) total energy at bottom = (1/2)(1530)(27)^2 work done = energy at top - energy at bottom average velocity = (27+6)/2 time = 4400/average velocity power = work done/time
October 12, 2016

Statistics
binomial distribution p(n,k) = C(n,k)p^k (1-p)^(n-k) p(3,1) = C(3,3) .38^3 * .62^0 = 1 * .38^3 * 1 do c next because b is 1 - c p(3,0) = 1 * 1 * .68^3 now b = 1 - c = 1 - .68^3
October 12, 2016

Science
The word "compound" is a dead giveaway.
October 12, 2016

Physics
ice is about 2.03 Joules/ gram deg c so 2030 J/kg deg c 1.2 kg *2030 J /kg degC (-15-T) = 20,000 J
October 12, 2016

Physics
v cos 30 = 110
October 12, 2016

Chemistry
.37* 500 = .96 x where x is the amount of strong stuff you put in 500 - x is the amount of water
October 12, 2016

Science
which answer uses the word "compound"?
October 12, 2016

Math. please help
-1/2 = -3/6 +1/3 = 2/6 does that help ?
October 12, 2016

Differential Calculus
find radius of surface as a function of height h r/h = 5/10 = .5 then surface area = pi r^2 = pi (.25 h^2) change in volume dv = surface area * dh dv = pi (.25 h^2) dh and dv/dt = .25 pi h^2 dh/dt 4 = .25 pi (9) dh/dt solve for dh/dt
October 11, 2016

algebra 1
50 mi/h * 5280 ft/mi *1 h /3600 s mi cancels h cancels we are left with 50 * 5280/3600 ft/s = 73 ft/s
October 10, 2016

error !
french alone = f history alone = h both = 8 f+8 - 10 = h+8 or f-h = 10 and f+h + 8 = 40 or f+h = 32 so 2f =42 f = 21 h = 11 so f+8 = 29 study french or both h+8 = 19 study history or both
October 10, 2016

Venn Diagram
french alone = f history alone = h both = 8 f+8 - 10 = h+8 or f-h = 8 and f+h + 8 = 40 or f+h = 32 so 2f =40 f = 20 h = 12 so f+8 = 28 study french or both h+8 = 20 study history or both
October 10, 2016

American Governement
I would be inclined to favor A, balance of power.
October 10, 2016

American Governement
Yes, right, A
October 10, 2016

Chemistry
.12 * 207 grams
October 10, 2016

value
(1/2)(100)(64) Joules
October 10, 2016

Chemistry
LOL, not observable I am sure h/(mv) = 6*10^-34 / (.05*40)
October 10, 2016

Math
Two problems: 1. x-8 -15 = -6 2. -x+8 -15 = -6
October 10, 2016

algebra
3000 = 1000 e^10 k 3 = e^10k ln 3 = 10 k solve for k n = 1000 e^5k with same k do e^5k on your calculator
October 10, 2016

social studies
They are in it !!!
October 10, 2016

Math/ Algebra
I did not miss a sign. 1/3x is not x/3
October 10, 2016

Math/ Algebra
well, if it is actually 14 = (1/3) x + 5 or 14 = (x/3)+ 5 then that is 14 = (1/3)27 + 5 14 = 9 + 5 yes however 14 is not 1/ (3*27) + 5
October 10, 2016

Math
m marbles in bag 2m/5 are red so 3 m/5 = b+y m = r + b + y b/y = 5/7 or y = 7b/5 3 m/5 = b + 7b/5 3 m/5 = 12 b/5 4 b = m b = (1/4) m
October 10, 2016

physics
I gave you the frequency and the rotational speed because I do not know what "rotational frequency" means.
October 10, 2016

physics
v^2/r = 6 m/s^2 so v^2 = 86.5 *6 v = sqrt (86.5*6) T = pi d /v = pi(173)/sqrt(86.5*6) f = frequency = 1/T omega = 2 pi f = 2 pi/T = 2 sqrt(86.5*6) / 173
October 10, 2016

Science
no F = m a big F is big m times big a
October 10, 2016

TECH ED HELP
I agree with kara.
October 10, 2016

Math
agreed on the first 2, there is no answer for number 2 but the third 2y = 2x-6 y = x-3 slope = 1 your -3 is b in y = m x + b, the y axis intercept
October 10, 2016

Calc I (@Reiny)
Reiny already did this for you. Yes, right.
October 10, 2016

physics
vertical force = m g - F sin 38 horizontal force =.42*vertical force - F cos 38 when the horizontal force is zero, it is about to accelerate so when F cos 38 = .42 (85*9.81-F sin 38) solve for F
October 10, 2016

math
3/24 = 1/8 = .125
October 10, 2016

Statistics
http://davidmlane.com/hyperstat/z_table.html
October 9, 2016

ashworth
Google subjunctive of was: http://www.google.com/search?q=subjunctive+of+was&ie=utf-8&oe=utf-8 he approves not we approve
October 9, 2016

computer
LOL, this depends on the level of detail. I am not going to do an entire flow chart for Turbotax deluxe :)
October 9, 2016

chemistry
to raise the temperature of 1 kg of Aluminum one degree centigrade you must put in 900 Joules of heat energy.
October 9, 2016

math(Quantitative) ...Pls help me
(b) maybe time of year, exchange rate for currency
October 9, 2016

math(Quantitative) ...Pls help me
well, your guess is as good as mine but (a) number of football games, depth of snow (b) Legon Ghana? (c) number of hurricanes in past 12 months, number of arrests of bank officers (d) month of the year, number of weddings scheduled for week
October 9, 2016

Maths
(1/2) g/cm^3 or 500 kg/m^3
October 9, 2016

chemistry
http://www.google.com/search?q=ch3oh+lewis+structure&ie=utf-8&oe=utf-8
October 9, 2016

math
pi/2 3 pi/2 and I suppose -pi/2 -3 pi/2
October 9, 2016

math
so she buys all red ribbon ! 20/1.59
October 9, 2016

Physics
zero, it came back
October 9, 2016

physic
.5 (840)(T-16) = 2(4200)(25-T)
October 9, 2016

Physics
zero Displacement is a VECTOR this ball moved up, then down. It therefore moved zero meters in no direction. They did NOT ask for DISTANCE
October 9, 2016

Math
C(16,4) = 16! / [ (16-4)!(4!) ] =16*15*14*13/(4*3*2) = 4 * 5 * 7 * 13 = 1280 Oh well
October 9, 2016

math
21/2 = 10.5 so try 10 + 11
October 9, 2016

physics
143 = m g + m a = m (9.81+0.762) m = 143/(9.81+.762) weight = m g
October 8, 2016

physics
g(Re/r)^2 = (1/4)(9.81)
October 8, 2016

physics
6.5 * 10^5 I expect you mean and 1.8*10^7 F = m a 6.5 * 10^5 = 1.8*10^7 a a = 3.61*10^-2 m/s^2 90 km/h (1 h/3600s)(1000 m/km) = 25 m/s v = a t 25 = 3.61*10^-2 t t = 6.93 *10^2 s = 693 s = 11.5 min
October 8, 2016

Interferometry carried to an unimaginable (for me) extreme
You better Google LIGO, but that is the whole thing. There is no simple reply really.
October 8, 2016

physics
6 g - T = 17 a T - mu(11 g) = 11 a what is a? d = (1/2) a t^2 1 = (1/2)a(1.48)^2 a = .913 m/s^2 6 g - T = 15.5 so T = 6 g - 15.5 so 6 g - 15.5 - 11 g mu = 10.0 let g = 9.8 and solve for mu
October 8, 2016

Math
LOL, cost / number of sprays
October 8, 2016

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