Friday
November 28, 2014

Posts by Damon


Total # Posts: 19,606

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

Math Help!
.3 * 60 = 18
November 24, 2014

math physics
yes http://hyperphysics.phy-astr.gsu.edu/hbase/sound/dopp.html#c4
November 24, 2014

calculus
You do not really need calculus. It is a parabola, find the vertex y=(x^2)-6x+10 x^2 - 6 x = y - 10 x^2 - 6 x - 9 = y-19 (x-3)^2 = (y-19) vertex at (3 , 19)
November 24, 2014

calculus
Oh y' = 2x-6 for 0, x = 3
November 24, 2014

calculus
Huh? There are values of y for each of those values of x at x = -3 y = 9 + 18 + 10 = 37 at x = 3 y = 9 -18 + 10 = 1 what is the question?
November 24, 2014

Math Help!
well, it better come out 35 :) either A or B will work. They are really the same. A is the one I would use
November 24, 2014

Physics
Yes, but multiply that by .25 to get the friction force 750 - 250 * 9.8 * .25 = 250 a 750 - 612 = 250 a
November 24, 2014

Math Help!
.8 * 20 = 16
November 24, 2014

Math
r = 6 base area = pi (36) height = sqrt (100 -36) = 8 vol = (1/3) pi (36)(8)
November 24, 2014

algebra
.14 s + .07 c = .13 (280) and s + c = 280
November 24, 2014

physics
By the way it will happen twice. The first time is when A catches up with B and is moving faster at 6 m/s the second time is as A is ahead of B but B is still accelerating and will catch up with A You want the first time I suspect. so use the - sign answer.
November 24, 2014

physics
distance A goes = 50 + distance B goes 6 t = 50 + B B = (1/2) a t^2 = .15 t^2 so 6 t = 50 + .15 t^2 .15 t^2 - 6 t + 50 = 0 does that have a positive real root? b^2-4ac = 36 - 30 = 6 sure enough so there is a time when they hit t = [ 6 +/- sqrt 6 ] /.3
November 24, 2014

math
Volume of anything with a pointy top and straight sides = (1/3) base area * height 9.00 meters square or 81 meters square, proofread !!! m is not m^2 if side is 3 then half side is 1.5 so it goes up h with base 1.5 and hypotenuse 1.76 h^2 + 1.5^2 = 1.76^2
November 24, 2014

Math Physics
yes 3 * 10^=6
November 24, 2014

physics
I just gave you a recipe below
November 24, 2014

College Physics
I am not going to do this for you. If you really do not know how to go about it here is a recipe: 1. convert 450 food calories which is 450,000 physics calories to joules. http://www.rapidtables.com/convert/energy/Calorie_to_Joule.htm Joules/second sleeping = 64.6 64.6 Joules/...
November 24, 2014

algebra 2
If you mean sqrt (a/b) / sqrt (a^2/b^2) = sqrt (a/b) / (a/b) = (b/a) sqrt (a/b) = sqrt (b/a)
November 24, 2014

Problem Solving
8 * 75 = 4 * 150 = 2 * 300 = 600
November 24, 2014

Brief Calculus
both odd functions through origin same area both sides of y axis 2 times integral 0 to 1 of xdx - x^3dx = 2(1^2/2 - 1^4/4) = 2(1/2-1/4) = 2(1/4) =1/2
November 24, 2014

Uniform Motion
downstream = 15/3 = 5 km/hr upstream = 15/5 = 3 km/hr so v+c = 5 v-c = 3 ---------- subtract 0 +2c = 2 c = 1 km/hr
November 24, 2014

Chemistry Physics
see below 10^8 /10^6 = 10^2 so 6
November 24, 2014

Math Physics
You are welcome.
November 24, 2014

Math Physics
distance = speed * time = speed/frequency so that part is fine but (3/50)(10^8/10^6) = (6/100)(10^2) = 6 meters
November 24, 2014

Physics
let x = a sin (w t + p) then dx/dt = v = a w cos (w t + p) d^2x/dt^2 = A = -a w^2 sin (wt+p)=-w^2 x then F = mA -kx = m (- w^2 x) w^2 = k/m w = sqrt (k/m) when w t = 2 pi, we have period T so w/(2 pi) = 1/T = f the frequency so f = (1/2pi) sqrt(k/m) so A. f = (1/2pi)sqrt (...
November 24, 2014

Social Studies
China is over 90% Han. As for the rest, think !
November 24, 2014

Algebra Huh ?
Please check for typos. If you have a line y = m x + b then the line perpendicular to that will have slope = -1/m so y = -(1/m) x + c and they cross at right angles
November 24, 2014

physics
I do not know what this means. Nothing is ever perfect, but after rounding off experimental results such as 1.51 and 1.52 to two significant figures they are both 1.5 so the difference would be zero (0.0) although it is not zero in real life.
November 24, 2014

Physics
Well, you need to ignore friction. If so then: Initial velocity up = Vi v at top = 0 so 0 = Vi - 9.8 t where t it time at top so t at top = Vi/9.8 so Vi = 9.8 t total time in air = 2 t = Vi/4.9 You measured 2 t evidently so divide your total time by 2 to get rise time t height...
November 24, 2014

physics
180 km/hr = (180/3.6) m/s so to run 1000 meters takes 1000 (3.6/180) = 20 seconds energy used = 560,000 Joules/s * 20 sec = 11,200,000 Joules 165 km/hr = (165/3.6) m/s 1000 (3.6/165) = 21.8 seconds energy used = (783) *21.8 = 17,083 Joules so 11,200,000 - 17,083 I do not ...
November 24, 2014

math
q = 2 d .25 q + .10 d = 3.6 .25(2 d) + .1 d = 3.6 .6 d = 3.6 6 d = 36 d = 6 so q = 12
November 24, 2014

physics
work = force * distance in direction of force so power = work/time = force * speed in direction of force 2.5 * 10^7 Watts This ignores and interaction between the flow around the plane in free stream and the propulsion system.
November 24, 2014

Physics
u = 40 forever so x = 40 t Vi = 0 v down = 0 + 9.8 t = 9.8 t z = height at top - 4.9 t^2
November 24, 2014

science
Vi = v sin 27.7 0 = Vi - 9.8 t t = v sin 27.7 /9.8 that is time to the top total time in air = 2 t = 2 v sin 27.7/9.8 u = v cos 27.7 d = (v cos 27.7)(2 v sin 27.7 /9.8) d = (2 v^2/9.8) cos 27.7 sin 27.7 but 2 cosA sinA = sin 2A d = (v^2/9.8) sin (55.4) either do d for v = 7.6 ...
November 23, 2014

add error
24 c = 360 c = 15 t = 20
November 23, 2014

algebra
t = c + 5 8 t + 16 c = 400 ================= 8 t - 8 c = 40 8 t + 16c = 400 ----------------- subtract -8 c = -360 c = 45 etc
November 23, 2014

physics
nope the frequency does not change. The speed of the wave changes so the length changes. There is no place to store leftover crests and troughs if you try to get five out one end per second while putting four in the other end
November 23, 2014

physics
Pe1 = 1.5 * g * h Pe2 = 4.5 * g * h so Pe2 = (4.5/1.5) (7)
November 23, 2014

PLEASE HELP PHYSICS
I think 1 is true. I can change the frequency of the sound waves from my lips by changing the frequency I generate them at. In fact the wave frequency is the generator frequency.
November 23, 2014

PLEASE HELP PHYSICS
1. sure, whistle different notes. 2. I agree false. 3. I agree true.
November 23, 2014

Physics
The paper runs out when the child has run 40 meters. The rest is irrelevant. 40 = (1/2) at^2 80 = .35 t^2 t = sqrt (80/.35)
November 23, 2014

Trig- math
You are welcome.
November 23, 2014

Trig- math
http://www.mathopenref.com/heronsformula.html
November 23, 2014

physics
work in = drag force * length of ramp (in other words the work done by the person dragging) gain in PE = m g h = 65 * 9.8 * 2 efficiency = 100(gain in PE/work in)
November 23, 2014

trig
need to know mu, friction coef if there is no friction, let mu = 0 F - mu (70) cos A = (70) sin A if mu is zero then F = 90 sin A so sin A = 36/90
November 23, 2014

Statistics
http://davidmlane.com/hyperstat/z_table.html
November 23, 2014

Physics
so what is the question?
November 23, 2014

science
well, baking soda and vinegar make models go fast. Vinegar is acid, baking soda is what you want. Lye soap is pretty caustic. Bleach maybe Borax. Mostly stuff you use for cleaning.
November 23, 2014

Math
60 - (-29) = 60 + 29 = 89
November 23, 2014

Physics
well, not quite the last part after you find t, the time, is d = (1/2) a t^2
November 23, 2014

Physics
Now that is quite enough. You are asking really the same question over and over again.
November 23, 2014

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