Friday

October 31, 2014

October 31, 2014

Total # Posts: 19,077

**chemistry**

C6H6 --> 6*12 + 6 = 78 grams/mol so we have 1/78 mol 1/78 mol in 0.1 liter --> 10/78 molarity etc
*August 26, 2014*

**Physics - figure with angles?**

If you tried to copy and paste it, that does not work here.
*August 25, 2014*

**Math**

green on first try = 1/4 green on second try: red first = 3/4 then green = 1/3 so 3/4 * 1/3 = 1/4 green on third try red first = 3/4 red second = 2/3 green third = 1/2 3/4 * 2/3 * 1/2 = 1/4 green o fourth try red first = 3/4 red second = 2/3 red third = 1/2 green fourth = 1/1 ...
*August 25, 2014*

**Calculus-Math**

well, we know we keep the 4 :) Let z = 4(sec u)^7 and u = pi t - 6 then dz/du = 4 * 7 (sec u)^6 d sec u/du = 28 (sec u)^6 (sec u )(tan u) = 28 sec^7 u tan u dz/dt = dz/du * du/dt = dz/du * pi so dz/dt = 28 pi sec^7(pi t-6)tan(pi t-6)
*August 25, 2014*

**French**

Pourriez-vous traduire ces expressions pour moi ?
*August 25, 2014*

**9th Grade Bio**

In "respiration" by the way you are basically oxidizing organic molecules using O2 from the air, sort of like burning wood to produce energy and CO2 but at much lower temperature :) At least that is the way a physicist as opposed to a biologist sees it.
*August 25, 2014*

**9th Grade Bio**

You are welcome.
*August 25, 2014*

**9th Grade Bio**

https://www.google.com/search?q=respiration+definition&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&channel=sb
*August 25, 2014*

**Math**

y = (4/3) x - 6 3 x = 7 - (4/3)x + 6 9 x = 21 - 4 x + 18 13 x = 39 x = 3 then y = (4/3)(3) - 6 y = -2
*August 25, 2014*

**Algebra**

No, when you list ordered pair as (a,b) a is independent variable x and b is dependent variable y
*August 25, 2014*

**Algebra**

try using 0 for x and 3 for y 3 = 0 + 3 sure enough
*August 25, 2014*

**math**

10^3 * 10^3 = 10^6 = one million
*August 25, 2014*

**Algebra**

2 x^2 = 108 x^2 = 54 note: 54 = 6 * 9 = 6 * 3^2 so x = 3 sqrt 6 or x = -3 sqrt 6
*August 25, 2014*

**chem**

the gas is still about 80% N2 so 8 atm It would also be 2 atm O2 instead of 0.20 atm O2 or ten times the O2 pressure. Both the high partial pressure of N2 and of O2 cause problems for divers and for deep diving for extended times mixtures with lower O2 content and Helium ...
*August 25, 2014*

**algebra**

draw a number line put a dot at +7 go left negative one when you go left negative, you go right
*August 25, 2014*

**math**

four choices for the first three for the second two for the third one for the fourth 4*3*2*1 = 24 usually this is called permutations and is written as n! where n! = n * (n-1) * (n-2) ....*1
*August 25, 2014*

**Agebra**

you did
*August 25, 2014*

**Physical Science**

LOL You only have two significant figures in 3.0 365.25 * 3.0 = 1095.75 which to two sig figs is 11*10^2
*August 25, 2014*

**Physical Science**

100 * .2/37 100 * .3/37
*August 25, 2014*

**geography**

because it is big and you only see a tiny bit of the surface of the sphere because you are so close to the surface like an ant on a huge round balloon. If you get far away, like in an orbiting space station, you can see the curvature.
*August 25, 2014*

**business math**

markup = 25,869.57 - 11,900 = 13,969.57 13,969.57 * 100 / 25,869.57 = 54
*August 25, 2014*

**phychics**

Moreover for the sake of us physicists, please spell physics.
*August 25, 2014*

**phychics - typos**

what is the friction on this friction track you gave the speed at the top - why do you ask for it? If it is another hill, what is the height?
*August 25, 2014*

**Physical Science**

I do not know because I do not know the true value. However I can give the percentage range from the average of the two. (37.2+36.7)/2 = 36.95 difference = +/- 0.25 100* .25/36.95 = + or - .68%
*August 25, 2014*

**Ed Tech**

I have a sneaking suspicion that they want antivirus software if they are downloading stuff.
*August 25, 2014*

**Math**

The round one with red and blue and white stripes
*August 25, 2014*

**Calculus**

p = 2L + 2 w w = 64/L so p = 2L +128/L w can range from 0 to L if w = 0, L ---->oo and p -->oo if w = L, L = w =8 and p = 4*8 = 32 so 32 </= p </= oo
*August 25, 2014*

**Math**

I suspect you mean but did not type: 5x^7/(97x+9) and not (5x^7/97x)+9 which is too easy If my guess is right and your use of order of operations and parentheses is wrong then use (bottom derivative top - top derivative bottom )/ bottom^2 [(97x+9)35x^6 - 5x^7((97)]/(97x+9)^2...
*August 25, 2014*

**Calculus**

Kadudu, see where you posted below
*August 25, 2014*

**Calculus**

sin 2x = 2 sin x cos x so 6 sin x cos x = 3 cos x right off, if cos x = 0, we have solutions. That is when x = pi/2 and x = 3 pi/2 also when sin x=1/2 that is x = pi/6 and x = 5 pi/6
*August 25, 2014*

**Physics**

I suspect you mean meters not miles but whatever s = speed horizontal: u = s cos 30 = .866 s if t = time rising, then 2t = time in air 15,000 = u *2 t = 1.732 s t so s t = 8660 vertical Vi = s sin 30 = .5 s v = Vi - 9.81 t v = 0 at t (the top) 0 = .5s - 9.81 t t = .05096 s so ...
*August 25, 2014*

**Physics**

If it takes 5 seconds to cover that distance you will have to throw it just about straight up so it will stay up five seconds ! u = constant horizontal speed = 10m/5s = 2 meters/second in 5 seconds it goes up 3 meters 3 = Vi t - 4.9 t^2 3 = Vi(5) = 4.9(25) 3 = 5 Vi - 122.5 Vi...
*August 25, 2014*

**physics**

You can not think of any at all?
*August 25, 2014*

**Math**

A 1/15 wall / day B 1/20 wall / day together 1/15 + 1/20 = 7/60 wall/day times 4 days = 28/60 = 7/15 wall
*August 24, 2014*

**Math**

been there, done that Masood + 1.2 Masood = 550 2.2 Masood = 550 masood = 250
*August 24, 2014*

**I think Chemistry**

Sorry, can not help
*August 24, 2014*

**math**

area of base = pi r^2 = 35^2 pi volume = height*base area = 50 * 35^2 pi ft^3 gallons = 50 * 35^2 * pi * 7.5
*August 24, 2014*

**PHY SCI**

Ac = v^2/R R = 500 meters v = 90 km/h * 1000 meters/km * 1 hr/3600 s
*August 24, 2014*

**PHY SCI**

Oh my, I suppose I will use feet and inches and miles and pounds and g = 32 ft/s^2 s = speed in ft/s u = horizontal speed = s cos 42 = .743 s Vi = s sin 42 = .669 s t = time rising 2 t = time in air 300 feet = 2u t = 1.49 s t v = Vi - 32 t 0 = .669 s - 32 t t = .0209 s so 300...
*August 24, 2014*

**Math**

7/15
*August 24, 2014*

**physics**

I am going to make a lot of symmetry assumptions and assume these are hockey puck with no rotational energy initial: V = vx i call ball mass = 1 kg momentum = vx i energy = .5 vx^2 Final ball 1 V1 = V1x i assuming symmetry so V1y = 0 momentum = V1x i energy = .5 Vix^2 ball 2 ...
*August 24, 2014*

**hurestics**

b+t = 74 3 t - 2 b = 87 3(74-b) -2b = 87 222 - 3 b - 2b = 87 5 b = 135 b = 27
*August 24, 2014*

**hurestics**

he had 27 available he spent 2 on 2 pencils so they were a dollar each
*August 24, 2014*

**MATHS LAH**

42 + 4 7(6) + 4(1)
*August 24, 2014*

**Calculus**

3 d/dx sin (4x) note: d/dx sin u = cos u * du/dx 3 cos (4x) * d/dx (4x) 3 cos (4x) * 4 12 cos(4x)
*August 24, 2014*

**Phsical Science**

The only real reason to stick with it in the US is the cost of conversion: http://education-portal.com/academy/lesson/english-system-of-measurement-definition-history-advantages-disadvantages.html#lesson
*August 23, 2014*

**Algebra**

I gather you mean: (2x+3)/4 or 2 x + 3 --------- 4 If so, yes
*August 23, 2014*

**chemistry**

MgCl2 HUH? Mg is +2 and Cl is -1
*August 23, 2014*

**Algebra**

yes, that is just a reversal of order which is commutative. It will work until you get to matrix multiplication.
*August 23, 2014*

**Algebra**

agree
*August 23, 2014*

**American Government**

You are welcome. I think on the average over the range of issues the bar has more influence. I personally resent all of these organizations and their influence.
*August 23, 2014*

**American Government**

I decline to give my opinion because I consider it embarrassing.
*August 23, 2014*

**chemistry**

you only have one H2O on the sulfate so I would call it a monohydrate Are you sure it is not 7H2O ???? instead of /H2O ???? the would make it D
*August 23, 2014*

**chemistry**

B is wildly wrong !!! C is also Wildly wrong for the same reason. Hydrogen reacts. Helium reacts with essentially nothing because that first level is full of its two electrons D is just crazy. Helium is our second element with two protons and two electrons.
*August 23, 2014*

**chemistry**

mass does not change in a chemical reaction
*August 23, 2014*

**Government**

You are welcome :)
*August 23, 2014*

**Government**

http://www.washingtonpost.com/wp-dyn/content/article/2009/07/05/AR2009070502770.html
*August 23, 2014*

**Physics**

does not matter what the charge on B is, call it -1 and call k = 1 To the left 2/(1)^2 + 1/(1)^2 = 3/1 to the left so we need 3 to the right Qd/4^2 = 3 Qd = 16*3 = 48
*August 23, 2014*

**College Algebra 1**

10 x^2 - 41 x + 21 = 0 (5 3) (2 7) ??? yes, 6 and 35 (5x-3)(2x-7) = 0 x = 3/5 or x = 7/2
*August 23, 2014*

**math**

yes
*August 23, 2014*

**math**

hint find common factor
*August 23, 2014*

**math**

you have 4 choices for the first digit 3 for the second 2 for the third left with one 4*3*2 = 24
*August 23, 2014*

**science**

I do not believe it can. The only thing I can think of is that you are dealing with two different isotopes of silver.(107 grams/mol and 109 grams/mol)
*August 23, 2014*

**math**

a = b/2 b = 2 a 5 b = 10 a half of 5 b = 5 a
*August 23, 2014*

**Precal**

Use your calculator cos 75 = cos 83 = cos 91 = cos 99 = cos 107 = cos 115 = cos 123 = cos 131 = cos 139 - cos 147 = now add to get a :)
*August 23, 2014*

**statistics**

http://www.alcula.com/calculators/statistics/correlation-coefficient/ http://www.alcula.com/calculators/statistics/linear-regression/
*August 23, 2014*

**statistics**

How about trying yourself instead of asking us to do them all?
*August 23, 2014*

**Algebra**

You are welcome :)
*August 23, 2014*

**Algebra**

9^ means 9^.5 or 9^2 or 9^.7315 or what? from your answer I am guessing 9^2 11 (81 - 25) /(12) = 51 1/3 yes
*August 23, 2014*

**Algebra**

Correct
*August 23, 2014*

**Algebra**

You are welcome.
*August 23, 2014*

**Algebra**

yes, order does not matter.
*August 23, 2014*

**Earth Science Continued**

For 1 I would have picked B but if B is wrong go with D 3. B yes 5. C yes, it is an example of the theory in action
*August 23, 2014*

**College Algebra 1**

1 = 1^2 25 z^2 = (5z)^2 so (1-5z)(1+5z)
*August 23, 2014*

**Algebra**

well, yes, but they asked for the expression: $25 + 6($14) not the result: answer = $109
*August 23, 2014*

**Algebra**

You are welcome :)
*August 23, 2014*

**Pre-cal**

one way: cos 75 + cos 83 + .....cos 147 = a sin 75 + sin 83 + .... sin 147 = b tan theta = b/a r = sqrt (a^2+b^2)
*August 23, 2014*

**Algebra**

.01 x + .04 (5-x) = .02 (5)
*August 23, 2014*

**nitw - Incomplete question**

You need the coef of friction or the time or the deceleration
*August 23, 2014*

**American Constitutional Law**

I assume we are talking about the national guard which is usually run by the state but can be called up by the federal government if needed. Therefore I think C see: http://www.arng.army.mil/aboutus/history/Pages/ConstitutionalCharteroftheGuard.aspx
*August 23, 2014*

**American Constitution Law**

see answer above http://www.arng.army.mil/aboutus/history/Pages/ConstitutionalCharteroftheGuard.aspx
*August 23, 2014*

**Math**

1 Mas + 1.2 Mas = 550 Mas = 550 / 2.2
*August 23, 2014*

**physics**

x axis from center A to center B Ball A before Vx = 10 cos 60 = 5 sqrt 3 Vy = -10 sin 60 = -5 let m = 1 kg Ke = (1/2)(100) = 50 Joules Ball B before Vx = 0 and Vy = 0 and Ke = 0 Ball 1 after Vx1 Vy1 Ke1 =(1/2)(Vx1^2+Vy1^2) Ball 2 after Vx2 Vy2 (has no Vy because hit in x ...
*August 23, 2014*

**physics**

Negative wavelets. The original Huygens Principle does not clearly account for the wave direction. The important point is that the wavelet phase must be considered. However, the diagram below shows that additional negative wavelets easily solve this problem. The use of black ...
*August 23, 2014*

**PHYSICS**

F cos 30 = 30
*August 23, 2014*

**Physics**

F = G M1 M2 / d^2
*August 23, 2014*

**maths**

6/20 = 30/100
*August 23, 2014*

**Math**

multiply both sides by 6 y 8 + 15 = 6 y 6 y = 23 y = 23/15
*August 23, 2014*

**algebra**

I bet you mean 5 x^2 / (x^3-x^2) 5 x^2 /[ x^2(x-1) ] 5 / (x-1)
*August 23, 2014*

**math**

5^2 = 2.5^2 + h^2 h^2 = 25 - 6.25
*August 23, 2014*

**science**

I have no idea. There are two naturally occurring isotopes of silver, 107 and 109, but that is not enough difference.
*August 23, 2014*

**Algebra**

If you meant to type (3/5)^3 then you are right.
*August 23, 2014*

**math**

pi r^2 - 9 4 pi - 9 about 3.566370614
*August 22, 2014*

**I have a pretty hard one**

5600/27 is a common fraction
*August 22, 2014*

**I have a pretty hard one**

there is a trick to finding the fraction for a repeating decimal by the way. Google repeating decimal in this case for example .407407407 ---- 1000 x = 407.407407407..... x = .407407407.... so 999x = 407 x = 407/999 = 11/27
*August 22, 2014*

**I have a pretty hard one**

oh 70 / (45/100 *75/100) 70 * 100 *100 / (45 * 75) 14 * 20 * 100 / (9 * 15) 14 * 4 * 100 / (9 * 3) 5600 / 27 = 207 11/27 because 207 * 27 = 5589 and 5600 - 5589 = 11
*August 22, 2014*

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