Friday
December 19, 2014

Posts by Damon


Total # Posts: 19,957

math!!
5^9
November 26, 2014

physics
initial momentum = 0 so final momentum = 0 0 = 80*1.5 + 120 * V V = - 120/120 = -1 meter/second
November 26, 2014

math
the first place on the right is either 0 or 1 times 2^0 which is one just as in base 10 the first place on the right is 0 1,2...9 or one of those numerals times 10^0 which is one the second place on the right is either 0 or 1 times 2^1 which is 2 just as in base 10 the second ...
November 26, 2014

math
1 * 2^0 = 1 0 * 2^1 = 0 1 * 2^2 = 4 1 * 2^3 = 8 so 13
November 26, 2014

math
1.25 L + .75 s = 109.75 L + s = 105 so s = (105-L) so 1.25 L + .75 (105-L) = 109.75
November 26, 2014

Physics
Force * distance/ time 85 * 9.8 * 2.5 Joules/second or Watts
November 25, 2014

math
7 * x^.5 * x^.5 = 7 * x^1 = 7 x
November 25, 2014

math
7 x
November 25, 2014

chemistry
H is enthalpy but I do physics, not chemistry.
November 25, 2014

chemistry
And I still think it is Physics :)
November 25, 2014

chemistry
(for example solids to gasses :)
November 25, 2014

chemistry
Increasing entropy is increasing disorder. look here http://chemistry.about.com/od/workedchemistryproblems/a/Entropy-Change-Example-Problem.htm note - more spread out --> more entropy
November 25, 2014

physics
yes
November 25, 2014

physics
350/353 = .991 seconds
November 25, 2014

physics
353 m/s
November 25, 2014

physics
http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html
November 25, 2014

physics
No, you must look it up
November 25, 2014

physics
That sounds good. I did not look up the speed of sound at that temp.
November 25, 2014

physics
that is the frequency 1.3 kHz =1300 Hz period = 1/frequency
November 25, 2014

physics
You will have to look up the speed of sound in meters/s, somewhere around 350, at 35 C ,call it v distance = speed * time (a) t = 350/v (b) period = T = 1/f wavelength = speed * period lambda = v /1300
November 25, 2014

Science 1 easy question!!!!
Sure, fine. Of course I do not know the exact words your text used but suspect you got them there.
November 25, 2014

Science 1 easy question!!!!
yes, that will do.
November 25, 2014

math
pi (Rout^2 - Rin^2) = 8.68 In other words just hollow out the shaft.
November 25, 2014

Science 1 easy question!!!!
yes, those are ions, not sharing, giving and grabbing
November 25, 2014

math
https://www.mathsisfun.com/definitions/triangular-prism.html
November 25, 2014

Physics help
D is rather orderly and counter to increasing entropy by throwing them all around the room.
November 25, 2014

Maths
AB up y axis from (0,0) s to (0,s) then BC right s (s,s) then CD down s to (s,0) then DA left to (0,0) O at (x,y) a = -x i - y j b = -x i + (s-y) j c = (s-x)i (s-y) j unknown d = (s-x)i - y j c + a - b = (s-x)i +(s-y)j-y j -(s-y)j = (s-x)i - y j (Caramba) so I get d = c + a - b
November 25, 2014

finance
for normal curve calculations I use: http://davidmlane.com/hyperstat/z_table.html
November 25, 2014

Chemistry
100 * 3.46 / 3.67
November 25, 2014

Chemistry
http://www.jiskha.com/display.cgi?id=1416948226
November 25, 2014

Chemistry
did that a few minutes ago
November 25, 2014

Thermodynamics
dQ/T is negative for part of the cycle and positive for another. Of course if you include the surroundings overall entropy shows its usual tendency to increase :)
November 25, 2014

Chemistry
2Zn + O2 ---> 2 ZnO Zn = 65 O = 16 ZnO = 81 g/mol 2.8 g / 81 g/mol = .0346 mol ZnO half as many O2 mols = .0173 mol O2 .0173 * 32 g/mol = .553 mol O2
November 25, 2014

programming
n = 0 1 read x n = n + 1 print x If n > 1, go down to 2 small = x large = x 2 If x</= small, then small = x If x>/= large, then large = x If n < 12 , go back up to 1 Print small Print large end
November 25, 2014

physics
P V = n R T so P1 V1 = P2 V2 2374 V1 = 14.7 * 194
November 25, 2014

Maths
You are welcome.
November 25, 2014

Maths
5/6 = 175/g 5 g = 6 * 175 g = 6 * 175 / 5
November 25, 2014

finnce100
Maybe sell calls at a strike above the present price. Use that income to buy puts at a strike price lower than present price. That limits your future gains to the amount between present and call strike but gives you protection against a catastrophic fall.
November 25, 2014

math
-2 p + 2 q
November 25, 2014

Chemistry
{OH][H] = 10^-14 [H] = 10^-14/10^-3 = 10^-14 * 10^3 = 10^-11 strong base
November 25, 2014

math
(7*5)^3 * (5*11) * 3^22 7^3 * 5^3 * 5^1 * 11^1 * 3^22 7^3 * 5^4 * 11 * 3^22
November 25, 2014

MATH
p = d p + d + q = 51 p + 10 d + 25 q = 573 cents so 2 p + q = 51 11 p + 25 q = 573 multiply the first equation by 25 and subtract 50 p + 25 q = 1275 11 p + 25 q = 573 -------------------- 39 p = 702 p = 18 etc
November 25, 2014

Math
4 sides 5 + 5 + 5 + 5 = 20 so 5 feet
November 25, 2014

Chemistry
H2 CO3 + Li OH acid + base = salt + water H+ ions are acid OH- ions are base so we have a pot with H+ and OH- ions we also have CO3-- ions and Li+ ions so we really have H2CO3 and LiOH carbonic acid and Lithium hydroxide H2CO3 + 2LiOH --> Li2CO3 + 2H2O
November 25, 2014

Chemistry
N = 14 g/mol O3 = 3*16 = 48 g/mol so NO3 is 62 g/mol so (NO3)2 is 124 g/mol 1.2017 * 124 =
November 25, 2014

Chemistry
[OH][H] = 10^-14 [OH] = (1/7.9)(10^-14/10^-7) = .127 * 10^-7 = 1.27 * 10^-8 a bit acidic
November 25, 2014

1 Math question
6+13 = 19 and it is about .60 over that
November 25, 2014

Math! Need The Help!
You are welcome.
November 25, 2014

Math! Need The Help!
12.4/6 = 2.06 10.58/5 = 2.12 14.11/9 = 1.57 15.47/8 = worse than 1.57 so C is the minimum unit price per box
November 25, 2014

Math Help! ASAP!
PsyDAG has it right. I did not read carefully enough. One in three.
November 25, 2014

Math Help! ASAP!
three homes to two cars is 3/2 I agree of course you would get the same answer if two of three homes had one car, but I suppose everyone could share :)
November 25, 2014

Chemistry
C2H4 + 3O2 --> 2CO2 + 2H2O ideally so for .0713 mol C2H4 we need 3*.0713 = .213 mol O2 so we do not have enough O2 so .156 mol O2 is limiting for .156 mol O2 we get (2/3).156 mol of CO2 or .104 mol of CO2 C = 12 g/mol O2 = 32 g/mol so CO2 = 44 g/mol 44 * .104 = 4.58 grams ...
November 25, 2014

I need help in 6th math
:), yes, I vote for 30 it is not 56 because we know Elizabeth has more than Rosalie
November 25, 2014

I need help in 6th math
E = (17/10) R E = 51 so (17/10) R = 51 R = 510/17 = 30
November 25, 2014

Math
log 45 = log 5 + log 9 = log 5 + 2 log 3 sorry, I need log 5, not log 2
November 25, 2014

pre calc
10 = (1/400) x^2 - 20 x ??? you did not use parenthesis so I assume this 4000 = x^2 - 8000 x x^2 - 8000 x - 4000 = 0 x = [ 8000 +/- sqrt(64^10^6+16000) ]/2 x = nah, impossible you must mean f(x) = x^2 /(400 - 20 x) 10 = x^2 / (400 - 20 x) 4000 -200 x = x^2 x^2 + 200 x - 4000...
November 25, 2014

Basic tech
I assume no friction, so the thing is accelerating F = m a F = 20 a a = F/20 distance = (1/2) a t^2 10 = .5 * a * 25 a = 20/25 = 4/5 = .8 m/s^2 so F = 20 a = 160 Newtons (1) work = 160 * 10 = 1600 Joules (2) that work is the enegy used (3) power = energy/time = 1600/5 = 320 Watts
November 25, 2014

Math
y = 0 x + 60
November 25, 2014

Physics Collision problem
original x momentum = 238 * 4.8*10^5 original y momentum = 0 final y momentum is still zero 0 = 234 Vt + 4 Vhe final x momentum is still 238 * 4.8*10^5 = 234 Ut + 4 Uhe but we know Uhe = 1.2 *10^7 cos 36 = you do it Vhe = 1.2 *10^7 sin 36 = you do it Then go back and solve for...
November 25, 2014

physics
He has no kinetic energy when he starts the jump and none when he gets to the lowest point. therefore all potential energy lost m g (Ho-h) goes into (1/2) k x^2 x = 46 - 9 - h = 37 - h m g (46-h) = (1/2)k(37-h)^2 61 * 9.8 (46-h) = 38 (37-h)^2
November 25, 2014

Maths
3 * 1 = 3 3 * 2 = 6 3 * 4 = 12
November 25, 2014

maths
6*6 = 36 7*7 = 49 the total weight went up by 13 pounds when we added the seventh ball.
November 25, 2014

Physics
before North (y) momentum =2300(14) - 1600 (16) cos(270-225) = 32,200 - 18,101 = 14,098 kg m/s East(x) momentum = 0 =18,101 = -18,101 after same momentum, but mass is 2300+1600 = 3900 kg East (x) = 3900 * Vx = -18,101 North (y) = 3900*Vy = 14,098 so Vx = -4.64 m/s Vy = 3.61 m/s
November 25, 2014

U.S. History
I was not aware of a "league of friendship".
November 24, 2014

physics (would mr. sue or mrs damen answer my ques
Not unless you give us the heat of fusion of water and the specific heat of water and silver. mass silver * specific heat of silver * (107-T) = heat of fusion of water * mass of ice
November 24, 2014

liberal arts
whoops sorry, forgot that he works at night. 2 * 4 = 8 then out the next day, 5 days
November 24, 2014

liberal arts
two feet every 2 days until we get within five 2*4 = 8 in 8 days now the ninth day we go up to 8+5 = 13 so we are free after 9 days
November 24, 2014

Physics
you did not give me the frequency or anything.
November 24, 2014

math problem (please help)
2 w + 2 L = 70 so w+L = 5 and L = (35-w) 300 = w (35-w) w^2 -35 w + 300 = 0 (w-20)(w-15) = 0 w = 15 or 20 so w = 15 and L = 20
November 24, 2014

physics
10 log I1/I2 = 10 log (102/408) = 10 log .25 = -6.02 so 6 lower
November 24, 2014

physics
G M m/r^2 = m g = 50 G M /r^2 = g = 50/30
November 24, 2014

physics
a = F/m = (7-3) * 10^4 / (1.3*10^5)
November 24, 2014

physics
I2/I1 = R1^2/R2^2 = 5^2/(10^4)^2 = 25 * 10^-8 10 log (25*10^-8) = 10 [-8 + 1.4] = - 66 dB 103 - 66 = 37 dB still pretty loud
November 24, 2014

Math I need help ASAP! I'm getting timed
Which ratios form a proportion? 1. 4/12 , 6/8 2. 16/12 , 3/4* 3. 3/2 , 15/14 4. 10/16 , 5/8 10/16 = 5/8 Which ratio forms a proportion with 9/15? 1. 6/10 2. 16/21 3. 36/50 4. 45/70 9/15 = 3/5 which is 6/10 A textbook weighs 2.5 pounds. How many kilograms does the textbook ...
November 24, 2014

physics
1. zero is correct 2. yes, any force up from the floor has no moment arm 3. change in Pe = m g h = (1/2) m g L Ke = (1/2) m v^2 + (1/2) I w^2 I = (1/12) m L^2 v = (L/2)w so Ke = (1/2)m(L^2/4)w^2 + (1/2)(1/12)m L^2 w^2 = (m L^2 w^2) (1/8 + 1/24) = m L^2 w^2 (1/6) so (1/2) m g L...
November 24, 2014

math calculus
agree
November 24, 2014

calculus
s = (6t+3)^.5 ds/dt = .5 (6t+3)^-.5 (6) = 3 (6t+3)^-.5 d^2s/dt^2 = 3 [ -.5(6t+3)^-1.5 *6) = -9 /(6t+3)^1.5 if t = 1 -9 / 9^(3/2) -9/27 -1/3 yes D
November 24, 2014

ratios and proportional relationships
15/100 = 75/w so w = 7500/15
November 24, 2014

trig
1. cos x = 1/2 x = 60 or x = -60 which is 300 in degrees or x = pi/3 or x = 2pi-pi/3 = 5 pi/3 in radians
November 24, 2014

physics
period = T = 18.5/23 seconds speed = 168 centi meters/ 20.21 seconds distance = speed * time = (168/20.21)(18.5/23)
November 24, 2014

Chemistry
If it weighs any number of grams it has millions of atoms even if it is URANIUM!!!!! 6.02 * 10^23 molecules/mol Avagadro's constant 7 C = 84 g/mol 8 H = 8 g/mol so 92 g/mol (74.5/92) * 6*10^23 = 4.86 *10^23 MOLECULES 7 times that many C atoms 8 imes that many H atoms
November 24, 2014

science
CO2 has just as many O atoms as O2 so the same number of mols
November 24, 2014

PLEASE HELP CHEMISTRY
Ag = 108 g/mol N =14 g/mol O3 = 3*16 = 48 g/mol so AgNO3 = 170 g/mol of which 108 is silver (108/170)(85) = 54, close enough
November 24, 2014

Calculus
y = f(x) dy/dx = f'(x) = y' first derivative d^2y/dx^2 = f''(x) = y'' second derivative
November 24, 2014

Algebra
cost = 30,000 + 42.25 x so 64.95 x = 30,000 + 42.25 x profit = (64.95-421.25)x - 30,000 = 100,000
November 24, 2014

Chemistry
Hey, Li has ONE valence electron I think you mean Li2SO4 6.02 * 10^23 molecules/mol so we have 6.78/6.02 = 1.13 mols of Li2SO4 which mean 2.26 mols of Li+ ions then we have 1.13 mols of SO4-- ions so 2.26 + 1.13 = 3.39 mols of ions in all
November 24, 2014

chemistry physics
You are welcome
November 24, 2014

chemistry physics
You get back 40 (((miles / hr) meters) / second) = 17.8816 m2 / s2
November 24, 2014

chemistry physics
Use Google for those conversions type 40 miles/hr meters/second and click
November 24, 2014

chemistry physics
looks resonable
November 24, 2014

chemistry physics
I just sent you a link for these Doppler problems.
November 24, 2014

Math Help!
That is the way I would do it :)
November 24, 2014

Math Help!
or rather 100 x = 6 * 179,000 x = 6 * 1790 = 10,740
November 24, 2014

Math Help!
yes 100 x = 6 * 179,000 = 6 * 1790 = 10,740
November 24, 2014

Math Help!
I would write 6/100 = x /179,000
November 24, 2014

Math Help!
In real life I would not have done this as a proportion. I would have said .06 * 179,000 = 10,740
November 24, 2014

Math Help!
I would not have written it your way, but your arithmetic is strange and I can not see how you got the right answer. 107400/100 = 1074 not 10740 but 10740 is correct
November 24, 2014

Math Help!
6/100 = x /179,000 yes answer is 10,740 but you method is suspect
November 24, 2014

Chemistry Physics
yes, just did this a minute ago http://hyperphysics.phy-astr.gsu.edu/hbase/sound/dopp.html#c4
November 24, 2014

math
7 + x 2 + x 7+x = 2 (2+x) 7 + x = 4 + 2 x x = 3
November 24, 2014

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