Saturday
February 6, 2016

Posts by Damon

Total # Posts: 25,127

Social Studies
Hmmmm ....... Sort of, but it is a tough argument to make. Perhaps because the cotton gin made a vast spread of cotton plantations possible and therefore made slavery a bigger factor in the economy of the United States than it would have been otherwise, it was a contributing ...
November 16, 2015

physics
.03*600 = ? Newtons
November 16, 2015

Chemistry
Hmm, well try to write a balanced equation C2 H4 + 3O2 ---> 2CO2 + 2H2O seems ok so for every mol of C2H4 I get 2 mol water C2H4 = 2*12 + 4*1 = 28 grams/mol so 2 grams is 2/28 = 1/14 of a mol so I get 1/7 mol of water water is 16+2 = 18 grams/mol 18/7 = 2.57 grams of water
November 16, 2015

Social Studies
You "think" that New Mexico has many Hispanics? OR You know perfectly well and it is well documented that New Mexico has many Hispanic residents? If someone "thinks" it, then it is opinion. if it is simply true and documented, then it is a "fact" ...
November 16, 2015

math
60 + 180 = 140 km journey length time at x = 60/x time at y = 180/y total time = 60/x + 180/y = 10 now interchange total time = 180/x + 60/y = 8 2/3 = 26/3 two equations 60 y + 180 x = 10 x y 180 y + 60 x = 26 x y /3 multiply bottom equation by 3 60 y + 180 x = 10 x y and 540y...
November 16, 2015

Science
I agree with those I know. I do not know if this one is right or not. My guess would be that you are correct.: Earth's oceans, atmosphere, and continents began to form during the first several hundred years of Precambrian time. A. True* B. False
November 16, 2015

History
I guess, although a bit trite. The other possible answers are silly though.
November 16, 2015

Physics
r = .32 meter c = 2 pi r n = 5200 meters / (2 pi r meters)
November 16, 2015

word problem math
18 / 15 = 6 / x multiply both sides by 15 x (or "cross multiply") 18 x = 15 * 6 x = 15 * 6/18 = 15/3 = 5 feet
November 16, 2015

SS
Joan of Arc (Thinking of France today)
November 16, 2015

Algebra 2
h(t) = 500 - 16 t^2 opens down (sheds water) if the ground were not at h=0 the tool would keep falling into negative h. (down a deep hole) The tool is at its maximum height, h = 500 at the beginning when h = 500 and t = 0 It is also below 500 feet in the imaginary time before ...
November 16, 2015

Physica
h = (1/2) a t^2 500 = 2.5 t^2 t = 14.1 seconds accelerating up Vi = 5 t = 5 * 14.1 = 70.7 m/s at 500 m then coasting up v = Vi - 4.9 t^2 v = 0 at top 4.9 t^2 = 70.7 t = 3.8 seconds coasting up beyond 500 m v average coasting = 70.7/2 = 35.4 m/s average for 3.8 seconds h = 500...
November 16, 2015

algebra
34 - 8 = 26 34 + 8 = 42 26 </= n </= 42 or |34 - n| </= 8
November 16, 2015

AP physics 1
Throw it in the direction opposite from the ship. Let momentum be conserved :)
November 15, 2015

Physics
north = 6 - 4 = 2 and distance 10 west 4-4 = 0 and distance 8 so distance = 18 km displacement = 2 North
November 15, 2015

Physics 1
The whole deal is drawing the picture. the wheel is 1 meter down slope from the center line of the vehicle g is x meters from the road normal to road surface along that center line so tan 47 = x/1 x = tan 47 = 1.07 meters but do not put passengers on the roof. (I am a ship ...
November 15, 2015

Algebra
savings <= 1800-1250
November 15, 2015

Physics
v = Vi + a t v = 0 at stop and Vi = 160,000/3600 = 44.4 m/s so 0 = 44.4 - .4 t t = 111 seconds how far in 111 seconds You can use d = Vi t + (1/2) a t^2 but it is easier just to use the average speed during the stop. Vav = (44.4 + 0)/3 = 22.2 m/s d = 22.2 * 111 = 2467 meters ...
November 15, 2015

Physics
The weight of the car is m g Newtons 1380 * 9.81 N moreover rea are talking about pressure over the area of pistons here, proportional to SQUARE of radius 1380 * 9.81 * .029^2 / .24^2
November 14, 2015

Calculus 1
Look, I took this subject back in 1956. I am not going to do half a million Newton's method approximations for you. I do not need the practice, you do. Sketch it, draw tangents. Try, then if you have trouble post.
November 13, 2015

Physics
centripetal acceleration = v^2/R Lift of wings = F weight = m g = F cos 20 so F = m g/cos 20 centripetal force = F sin 20 = m g sin 20 / cos 20 = m g tan 20 centripetal force = m Ac = m v^2/R so m v^2/R = m g tan 20 so R = v^2/(g tan 20)
November 13, 2015

Physic
A at 25 B at 40 B is faster than A by 40 - 25 if you look at B from A then A is going at 15
November 13, 2015

Science
Well, yes, the wavelength of an electron is shorter than that of a visible light photon and therefore you can resolve smaller objects.
November 13, 2015

History
You are welcome.
November 13, 2015

History
I agree with them all although Question 11 was a short lived success.
November 13, 2015

physics - Huh?
I do not know. It depends how long you sustained the 50 N force.
November 13, 2015

physics
20 N = 9.81 * m m = 2.04 kg volume = 2.04 kg/7800 kg/m^3 = .000261 m^3 mass of fluid displaced = .000261*830 = .217 kg mass metal - mass fluid displaced = 1.82 kg metal mass metal weight = m g = 1.82*9.81 = 17.9 Newtons
November 13, 2015

Math
present pay rate = 567/45 = 12.6 $/h new salary = 567*1.1 = 623.7 new hours = .9*45 = 40.5 new pay rate = 623.7/40.5 = 15.4 $/h change = 15.4 - 12.6 = 2.8 $/hour
November 13, 2015

Math 141
p none on first draw = 48/52 now I have 4 aces in 51 cards p none on second draw = 47/51 so 48/52 * 47/51 = .851
November 13, 2015

Math
A does
November 13, 2015

math
1.3 means it grows 30% per week 345 (1.3)^4 = 985
November 13, 2015

Chemistry
You need 3*1.6 = 4.8 mols of stuff it is 8 mols/liter 4.8 mols ( 1 liter/8 mols) = .6 liters of the strong stuff so mix 0.6 liters of the 8 M stuff with 1 liter of water
November 13, 2015

Math
yes number of boxes * number of cookies/box
November 12, 2015

Math
Yes, you did not need help after all :)
November 12, 2015

Math
x = 8 + 2 y right x = -2 y right so 8 + 2 y = - 2 y because both are equal to x so -4 y = 8 y = -2 then x = -2 y = 4 so I get they hit at ( 4, -2)
November 12, 2015

Math
4.00 * r = .32 r = .08 or 8%
November 12, 2015

chemestry
Use P V = n R T to find n, the number of mols in a liter (around 1/22.4 moles/liter but the temp is not zero) then y N2 weighs 2*14 = 28 grams/mol so using my 1 mol/22.4 liters You would have 28 grams/22.4 liters = 1.25 grams/liter you probably want grams / cm^3 though. there ...
November 12, 2015

Algebra
well for example - 2 - 12 x < -14 -12 x < -12 x > 1
November 12, 2015

Math
I agree with 1 through 8
November 12, 2015

Pre calc
check - should be close to continuous compounding 1.375 = e^rt ln 1.375 = 5r r = .0637 or 6.37% sure enough
November 12, 2015

Pre calc
let x = 1+r 1100 = 800 (x)^(5*365) 1.375 = x^1825 log 1.375 = 1825 log x log x = .1383/1825 = 7.57823 *10^-5 x = 1.00017451 r = x-1 = .00017451 per day 365 r = .0637 nominal per year = 6.37 percent
November 12, 2015

Algebra 2
60 x = 45 x = .75 1.00 - .75 = .25 which is 25% down
November 12, 2015

Maths
any real number squared is positive so -(x+5)^2 is negative now go left two on the number line and you are even more negative :)
November 12, 2015

Physics 101
circumference = 2 pi R = pi D = 31.4 meters 45 deg = 360/8 so 31.4/8 meters 45 rad = 45/(2 pi) circles = 7.162 circles 7.162 * 31.4 = 225 meters 45 circles 45 * 31.4 = 1413 meters
November 12, 2015

Vocab
well, stocks are pieces of paper representing something valuable but a commodity like a barrel of oil is actually goods with value.
November 12, 2015

Vocab
I am sorry. I do not know what an "actual" manner means. Perhaps we are talking about a poem that describes a specific story which is likely a ballad (I do not know what a ballard is either)
November 12, 2015

Math
1.29/0.3 = 12.9 /3 = 129/30 the middle one is easy 4.3
November 12, 2015

Physics
175 sin 20 The way to remember this is to think of the box on a level floor. Then the component parallel to the surface is obviously zero. and sure enough sin 0 = 0 the normal component is the entire weight when the surface is level and sure enough cos 0 = 1
November 12, 2015

physics b
4 to 6 is 2 degrees 6 to 12 is 6 degrees, three times as much change in T so 3 Q
November 12, 2015

physics b
one kg water falls 100 meters potential energy loss = m g H = 1 * 9.81 * 100 = 981 Joules so 981 Joules goes to heat that 1 kilogram 981 J = 1 kg * 4.186*10^3 * delta T so delta T = 981 /(4.186*10^3)
November 12, 2015

Math
C = 11 n yes but you do not buy a fractional DVD so I think d
November 12, 2015

Maths
take out 1/4 and try no way :( 4x-1 not a factor of 4x^3 -24 x^2 - 4 x + 120 where did you find this problem?
November 12, 2015

Maths
long division I get x^2 -4 x + 8
November 12, 2015

physics
http://www.acoustics.salford.ac.uk/feschools/waves/diffract3.php
November 12, 2015

physics
more http://physics.about.com/od/mathematicsofwaves/a/interference.htm
November 12, 2015

physics
Yes, I bet this will help: http://physics.about.com/od/mathematicsofwaves/a/huygensprincipl.htm
November 12, 2015

physics
You watched that double slit video and do not understand what diffraction is? Maybe look up "Huygen's Principle" I will try.
November 12, 2015

physics
LOL - first do the diffraction video :)
November 12, 2015

physics b
8950 J = .174 kg (delta T)[452 J/(kg deg C)] so delta T = 8950 /(.174*452)
November 12, 2015

physics
Yeah, cool, that is a pretty good U tube
November 12, 2015

physics
ah, here is a U tube for double slit. I bet that helps http://www.youtube.com/watch?v=iZdWQKaykvs
November 12, 2015

physics
Here is a diffraction grating Note that the angle of the first maximum depends on the wavelength of the light, which allows you to separate wavelengths by their angle. http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/grating.html Probably the easiest one to understand though ...
November 12, 2015

physics
Oh my, where to start. Any time a wave encounters something of size the same order as the wavelength, diffraction happens. It does not matter if it is an ocean wave at the tip of a breakwater or a light wave hitting a diffraction grating. Maybe google single slit diffraction
November 12, 2015

Math
subtract is subtract, algebra or not.
November 12, 2015

Geometry
(Y2-Y1)/(X2-X1) = (-2 -3)/(5 + 2) = -5/7 I think you have a sign typo
November 12, 2015

Maths
y = 6 - x so y^2 = 36 - 12 x + x^2 so 2 y^2 = 2 x^2 - 24 x + 72 so 3 x^2 - 24 x + 72 = 36 3 x^2 - 24 x + 36 = 0 x^2 - 8 x + 12 = 0 (x-2)(x-6) = 0 x = 2 or x = 6 x = 6 is trivial because then y = 0 if x = 2, y = 4 so (6,0) and (2,4)
November 12, 2015

physics
if in meters/ second^2 v = Vi - 9.81 t at the top v = 0 so 0 = 29.4 - 9.81 t t = 3 seconds drifting upawrds Now you could do the 4.9 t^2 thing but it is easier just to use the average speed up which is (1/2)29.4 m/s = 14.7 m/s height = 1.8 m + 14.7 m/s * 3 seconds = 1.8 + 44.1...
November 12, 2015

physics
and what units ? Yikes ! what do you use for g? 9.81 m/s^2 or 32 ft/s^2
November 12, 2015

huh?
Thrown at what angle to horizontal? In furlongs / month? It has to do with distance = initial position + Vi t + (1/2) a t^2 but that may not be the easy way to do it. conservation of energy is faster if the max height is all you need.
November 12, 2015

precalc
log5 (25) 5^(log5(25) = 25 but 5^2 = 25 so log5(25) = 2
November 12, 2015

Physics
Now I have done several of these. You try. a = dv/dt
November 11, 2015

Math
(4 oz/serving )(1 pound/16 oz) = .25 pounds /serving 238/.25 = 952 servings that is exact but you must have a typo. No salmon is that big, maybe a bluefin tuna :)
November 11, 2015

math
y - 3 x = 3 4 x -y = 2 ------------------add 1 x + 0 y = 5 or x = 5 4(5) - y = 2 y = 18
November 11, 2015

Math
1.62 ---- times 10/10 = 16.2/8 0.8 .0162 ------ times 1000/1000 = 16.2/8 etc 0.008
November 11, 2015

Math
L w = 3/5 but w = 2/5 so L (2/5) = 3/5 L = 3/2 w L/w = (3/2) /(2/5) = 3/2 * 5/2 = 15/4
November 11, 2015

Math
Use a number line by the way
November 11, 2015

Math
now you changed it 12 to 13 = 2.7 13 to 14 = 3.6 13 to 15 = 6.8 + 2.7 + 3.6 = 13.1 so 14 to 15 = 13.1 - 3.6 = 9.5 which is 13 to 15 - 13 to 14
November 11, 2015

Math
12 to 13 = 2.7 13 to 14 = 3.6 13 to 15 = 6.8 + 2.7 + 3.6
November 11, 2015

chemistry or physics
about 3*10^8 m/s
November 11, 2015

Math/ Proportions solve using unit rates
( First my way, then your way :)
November 11, 2015

Math/ Proportions solve using unit rates
the unit rate is 25/5 minutes rest/hour = 5 minutes rest /hour so 8 hours * 5 minutes rest/hour = 40 minutes rest
November 11, 2015

Math/ Proportions solve using unit rates
8 hours ( 25 minutes rest / 5 hours ) = 40 minutes rest
November 11, 2015

Physics
a = change in velocity / change in time = (15 - 5 ) /15 = 10/15 m/s^2 = 0.667 m/s^2
November 11, 2015

chemistry
distance = speed * time and period = 1/f 413 *10^-9 meters ?=?? 3*10*8 m/s / (6.26 * 10^14) 413 * 10^-9 = .479 *10^-6 ???? 413 = 478 ??? not really
November 11, 2015

Math
(15+16+17+14+19+x)/6 >/= 16 81 + x >/= 96 x >/= 15
November 11, 2015

Physics
v = Vi + 3 t 40 = 30 + 3 t t = 10/3 seconds d = 35 (10/3)
November 11, 2015

physics
a = -2 m/s^2 v = Vi - 2 t v = 30 - 2*5 = 20 at the end so average v = 25 m/s 25*5 = 125 meters
November 11, 2015

Math
5.Which number is a perfect cube? 5**** 100 125 150 ah 125 = 5 * 5 * 5
November 11, 2015

Physics
figure at http://i.gyazo.com/47dc49d5ec1eebe950472dba5f692e70.png I will only do the right half (symmetry) 5 kg down on the right half 5 kg * 9.81 = 49 Newtons so tension below B: call it TL TL cos 30 = 49 so TL = 56.6 N so component of TL to the left at B TL left = 56.6sin 30...
November 11, 2015

Algebra
66/101 = .653 so 65.3 %
November 11, 2015

Math
Look Princess, we went through this when you were trying to simplify fractions. 22 for example is 2 * 11 2 and 11 can not be factored any further. They are "prime" then 44 = 2 * 22 that is NOT Enough (not prime factors) because 22 can be factored as we know so 44 = 2...
November 11, 2015

Algebra
here are 4 styles each has possible 5 colors 4*5 = 20 there are 5 colors so 1/5
November 11, 2015

Math
b + 49/8 = 23/4 = 46/8 so b = 46/8 - 49/8 b = -3/8
November 11, 2015

physics
3881 = 4.9 t^2 t = 28.1 seconds v = g t = 9.81 (28.1) = 276 m/s
November 11, 2015

ALGEBRA
the minimum of function 2 is 0 at (-1,0) for the first function 1 y = 4 x^2 + 8 x + 1 4 x^2 + 8 x = y - 1 x^2 + 2 x = (1/4) y - 1/4 x^2 + 2 x + 1 = (1/4)y + 3/4 (x+1)^1 = (1/4) (y+3) so vertex at (-1, -3) SO A
November 11, 2015

top ville college
2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) You one mol of CO2 for each 2 mols of soda so we have .25 mol of Co2 a mole of ideal gas at STP is 22.4 liters so 22.4 / 4 Liters
November 11, 2015

math
maybe try 87,000 and 98,000
November 11, 2015

science
pressure = 4 N/2 cm^2 = 2 N/cm^2 force = pressure * area = 2 N/cm^2 * 16 cm^2 = 32 N NOW area is cm^2 , not cm cm is distance along a line cm^2 is area of a surface
November 11, 2015

Math
2750 /(5*3600) = .15277 which is .15 there are 3600 = 60 * 60 seconds in an hour
November 11, 2015

math
2.5 cm ( 2 m/1 cm) = 5 m That is one long window !
November 11, 2015

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