Monday

August 29, 2016
Total # Posts: 26,833

**math**

300/330 = .91 1 - .91 = .09 .09 * 100 = 9 %
*January 11, 2016*

**Physics**

with F = m a f cos 38 = .788 F again a = change in velocity/time = 2.2/time but time = distance/average speed = 3.4 /1.1 = 3.09 seconds so a = 2.2/3.09 = .712 m/s^2 so .788 F = 12 * .712 F = 10.8 Newtons (remarkable)
*January 11, 2016*

**Physics**

You can do it with work if you wish or you can do it with F = m a with work work done = Force in direction of motion * distance Force in direction of motion = F cos 38 = .788 F work done = .788 F * 3.4 meters = 2.68 F Joules that is the increase in kinetic energy (1/2) m v^2...
*January 11, 2016*

**so what is the question**

Are you doing geometric sequences? Fractals ? whatever ?
*January 11, 2016*

**us history**

If you go east from Florida you go to Africa.
*January 11, 2016*

**Math watch addition**

45 min for lunch so 6 hrs and 85 minutes I hour = 60 minutes so you have 7 hours 20 minutes I think 25 minutes
*January 11, 2016*

**Math**

driving 6.5 hr gas 1/6 hr lunch 3/4 hr sum = 7.41666666... hr = 7 hours + .416666.. * 60 min = 7 hours and 25 minutes so that is 5 hours to noon + 2 hours 25 minutes before noon sounds like 9:35 am
*January 11, 2016*

**Physics**

F up = 119 sin 31 = 61.3 N F x = 119 cos 31 = 102 N normal force = m g - 61.3 = 22.5*9.81 - 61.3 = 159 N friction force = .72*159 = 115 N They did not ask for the horizontal acceleration?
*January 11, 2016*

**math**

x of them were there x/4 after an hour x/4 - 20,000 after two hours that is x/12 so x/12 = x/4 - 20,000 3 x/12 - x/12 = 20,000 x/6 = 20,000 x = 120,000 big game
*January 11, 2016*

**math**

if 3 + 4 i is a solution then its complex conjugate 3 - 4 i is also a solution because when you solve a quadratic for example (- b +/- sqrt(b^2-4ac))/2a if b^2-4ac is negative then you have -b + number*i and -b - same number*i They come in complex conjugate PAIRS
*January 11, 2016*

**better link**

http://www.khanacademy.org/science/chemistry/acid-base-equilibrium/copy-of-solubility-equilibria-mcat/v/solubility-product-constant-from-the-solubility
*January 11, 2016*

**Dr Bob - Kayla needs you :)**

I am just plodding through this
*January 11, 2016*

**math/ chemistry**

so you have 1.72 * 10^-3 g /100 mL which is 17.2 * 10^-3 g/liter ten times as much because 1000mL is 1 liter how many mols is 17.2 * 10^-3 g 17.2*10^-3 g/L / 62 g/mol = .277 * 10^-3 mol/Liter 2.77 *10^-3 mols/Liter or M Now to get from there to Ksp I suggest looking at https...
*January 11, 2016*

**math/ chemistry**

there are 1000 cubic centimeters which is 1000 grams of water (close enough) in a liter which is 10 cm * 10 cm * 10 cm now I do not know what chemical you are using that is 62 grams/mol You better give me the whole problem carefully because unless you know M, the molarity, you...
*January 11, 2016*

**Math forum link**

http://mathforum.org/sum95/suzanne/whattess.html
*January 11, 2016*

**yes**

Yes, yes, yes I love it !!!
*January 11, 2016*

**Math**

4 + 5 = 9 4/9 5/9
*January 11, 2016*

**BUT**

which of those is the key to FAILURE of modern civilizations?
*January 11, 2016*

**History**

Nile, Indus, Tigris, Euphrates, Yellow, Mekong ........ Oh, Belarus Volga, Oxus ....
*January 11, 2016*

**Math**

4 s + 6 h = 52 2 h = 1 + s so 6 h = 3 + 3 s ========================= ====================== so 4 s + 3 + 3 s = 52 7 s = 49 s = 7 well that was easy
*January 11, 2016*

**Now way no way no way at all**

Now how can I be 10 years old and 4 years before birth at once :( Those are two parallel lines, they never cross. THERE IS NO SOLUTION !!!!
*January 11, 2016*

**yes**

yes
*January 11, 2016*

**us history**

I love using Mother Jones as my primary source.
*January 11, 2016*

**us history**

Google Mother Jones Haiti Napoleon Louisiana I already used it today :)
*January 11, 2016*

**us history**

Google will settle that in no time :)
*January 11, 2016*

**Math**

well, 1/4 of what it all cost last week so'last week 8000 + 2040 + 8400 = 18,440 so this week 18,440/4
*January 11, 2016*

**Physics**

d is the same for both I will do F d^2 so you see which wins :) gravity Fg * d^2 = G M1 M2 = 6.673*10^-11 * (1.673*10^-27)^2 = 18.7 * 10^-65 electrostatic Fe d^2 = k Q1Q2 = 9*10^9 (1.6*10^-19)^2 = 23 * 10^-29 it is 10^-65 for gravity and 10^-29 for electricity Electricy wins ...
*January 11, 2016*

**Physics**

if a = 0 F = m g = (91)(9.8) = 892 N a = 1.7 m/s / 1.07 s = 1.59 m/s^2 Fup - mg down = m a = 91(1.59) Fup = 892+145 = 1037 N constant speed, no acceleration so back to m g = 892 892 -91(1.67/t) and 0 = 1.7 - 1.67 t t = 1.02 seconds to stop so 892 - 91 (1.67/1.02) = 743 N
*January 11, 2016*

**physics**

a = change in v / change in time = (12-2)/2 = 5 m/s^2 m Vi = 1500 * 2 = 3000 kg m/s m Vf = 1500 * 12 = 18,000 kg m/s 18,000 - 3000 = 15,000 kg m/s F = rate of change of momentum = m a do both ways F = 15,000/2 = 7,500 N or F = 1500 * 5 = 7,500 N remarkable LOL Now What Newton ...
*January 11, 2016*

**us history**

I do not think so, but you are entertaining. I am from Cape Ann where we had few slaves and 15 year old girls helped their mothers.
*January 11, 2016*

**us history**

The wrong ones are a riot !
*January 11, 2016*

**Math-Algebra**

Just try them, and did you catch the error in your previous problem way below, scroll down as for this 2(4) -5(-3) = 8 + 15 yes, ok 2(-5/3) -5(5) = 10/3-25 NO, way too small 2(5)-5(3/4) easy bigger than 6 etc
*January 11, 2016*

**us history**

yes
*January 11, 2016*

**us history**

I do not think so. You better Google Shay's rebellion. The middle two possible answers are a pretty good hint.
*January 11, 2016*

**Geometry**

LOL, just draw tow isoceles triangle, one equilateral 60 60 60 , one 90 45 45
*January 11, 2016*

**Geometry**

Two congruent triangels are similar : ALWAYS Two squares are similar : ALWAYS Two isosceles triangles are similar : SOMETIMES Two obtuse triangles are similar : SOMETIMES Two equilateral triangles are similar ALWAYS
*January 11, 2016*

**Geometry**

X^2 +(X^2 + 4 X + 4 ) = X^2 +8 X + 16 ?????? x^2 - 4 x - 12 = 0 (x-6)(x+2) = 0 x = 6
*January 11, 2016*

**math**

Hey, give me the whole problem the first time. When I did the one below you did not say angle was right angle at B
*January 11, 2016*

**math**

|AC|^2 = 40^2 + 45^2 = 1600+2025 so |AC| = 60.2 meters Now this is the same as the problem below this one draw a line through A perpendicular to AC Now with trig the problem is trivial, but I will assume you must stick to geometry let AP = x then CP = (60.2 - x) call the ...
*January 11, 2016*

**math**

I suspect you tried to paste a picture here. That will not work. I do not see it. However you need the line perpendicular to AC through point B If you have AC in algebra y = m x + b then the slope of BP is m' = -1/m and it goes through B so find y = m' x + b' for ...
*January 11, 2016*

**disagree**

I would subtract first to eliminate y 65 y is in both
*January 11, 2016*

**physics**

P V/T = n R n and R are the same for both P1 V1/T1 = P2 V2/T2 P1 V1 T2 = P2 V2 T1 T2 = T1 (P2/P1)(V2/V1) luckily using degrees Kelvin so T2 = 300 (3.5/2)(12/15)
*January 11, 2016*

**physics**

first figure out what higher frequency the wall hears that frequency emmitted from the wall toward the car at that frequency then get the still higher frequency back at the car
*January 11, 2016*

**Physics**

east momentum positive initial 4.5 * 5 - 1.5 * 3 = 18 final 4.5 V1f + 1.5 V2f = 18 now energy (elastic means same before and after) (never happen:) initial (1/2)4.5(25) + (1/2)1.5(9) = 63 Joules after (1/2)4.5(V1f)^2 + (1/2)1.5(V2f^2) = 63 there you have 2 equations and two ...
*January 11, 2016*

**tilt**

I mean when(2t-2) when v = 10 10 = t^2 -2t + 2 t^2 - 2 t - 8 = 0 (t+2)(t-4) = 0 use + t so t = 4 a = 2 t - 2 = 6
*January 11, 2016*

**Physics - probably typo**

a = dv/dt = 2 t - 2 if you really mean when v = 2 we have to go back and find the times when v = 2 2 = t^2 - 2 t + 2 t^2 - 2 t = 0 t(t-2) = 0 t = 0 or t = 2 so a = 2 t - 2 = -2 or = 2
*January 11, 2016*

**Math**

4 = x^2 + 3 x ??? x^2 + 3 x - 4 = 0 (x+4)(x-1) = 0 x = 1 , -4
*January 11, 2016*

**us history**

Nope, think what we do around Boston. We are merchant shippers.
*January 11, 2016*

**us history**

I guess I will have to go with Hamilton et al then.
*January 11, 2016*

**us history**

whoops !
*January 11, 2016*

**Hip Hip HOORAY !!!!!**

Yes !! Somebody got one !!!!
*January 11, 2016*

**MATHS**

you kidding? x^6 - x^2 + x + c
*January 11, 2016*

**us history**

remember that "well ordered militia being necessary ...." phrase in there ?
*January 11, 2016*

**physics**

V = i R
*January 11, 2016*

**Math log equation**

5^a + 20*5^b = 0 a log 5 + log 20 + b log 5
*January 11, 2016*

**us history**

I vote for that, being from Massachusetts :)
*January 11, 2016*

**algebra**

6 k /(3 h) = 2 k/h
*January 11, 2016*

**Math**

log 10 [10^(3x-8) ] = 3x-8 log 10 [ 2^(5-x)] = (5-x)log 10[2] so 3x - 8 = (5-x)(0.301)
*January 11, 2016*

**Math**

I have a sneaking suspicion you might mean 10^(3x-8) = 2^(5-x) ???????????????
*January 11, 2016*

**Math**

70 is indeed smaller than 250. I vote for Ms. Sue
*January 11, 2016*

**Physics**

well, I guess if it zipped through empty space it is an electromagnetic wave with a speed of about c = 3 * 10^8 m/s I guess it is two dimensional space since no one is mentioning speed along the z axis so Vx = .43 m/s Vx^2 + Vy^2 = 9 * 10^16 Vy ^2 = 9 * 10^16 - 18*10^-2 LOL I ...
*January 11, 2016*

**Physics**

Note I assume x axis at 0 Bob used compass from N
*January 11, 2016*

**Physics**

Vector = magnitude (cos T i + sin T j ) i is x direction j is y direction Thus R x component = 145 cos 190 + 75 cos 288 + 210 cos 85 + 105 cos 355 R y component = 145 sin 190 + 75 sin 288 etc in the end |R| = sqrt (Rx^2 + Ry^2) angle = tan^-1 (Ry/Rx)
*January 11, 2016*

**Math**

The point is that we can help if you get stuck, but will not do your work for you.
*January 11, 2016*

**Bob**

http://www.jiskha.com/display.cgi?id=1452542999
*January 11, 2016*

**Math**

(2/3) / (1/2) multiply top and bottom by 6 (12/3) / (6/2) = 4 / 3
*January 11, 2016*

**why is everyoe expecting me to do all their work today**

I can not see your drawings. I am here to help if you get stuck. I took this in 1952 and do not need practice. Let's see where you get stuck, then ask.
*January 11, 2016*

**Math**

10/6 = 1 2/3 2/3 of 12 is 8 so 1 foot and 8 inches
*January 11, 2016*

**Math**

You are welcome.
*January 11, 2016*

**Math**

.6 x = 36 x = 36 / 0.6
*January 11, 2016*

**No you have to pay for that second one.**

sorry
*January 11, 2016*

**maybe try this**

http://www.imcpl.org/cgi-bin/fullbib.pl?bibno=1401051
*January 11, 2016*

**ELA**

Well, you can read free for two weeks here: http://www.scribd.com/book/249307735/Johnny-Tremain
*January 11, 2016*

**Math**

9 --> 0 is down 9 and then down more 0 ---> -6 = down 6 total down = 15
*January 11, 2016*

**HEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEELPP**

16 - Do you seriously not know what an isotope is ? 15 also ridiculous
*January 11, 2016*

**humm, some very easy ones**

I bet you know the answer to question 23 perhaps even 21 and 20 Please answer those then try the rest. I am not taking this course. I am only here to help you if you get stuck, not to do all the problems.
*January 11, 2016*

**Algebra**

y = m x + b m is the slope. b is the y axis intercept.
*January 11, 2016*

**Math**

function 1 is y = 3 and slope = 0 function 2 has slope = 3 3/0 is UNDEFINED
*January 11, 2016*

**Please scroll down**

Please stop asking the same questions over and over.
*January 11, 2016*

**Math**

I did this one, scroll down.
*January 11, 2016*

**math help..STEVE**

a 4 x 5 grid with 6 blocks shaded (1 point) 6 over 25, 30% 3/50, 6% 6 over 25, 24% 3/10, 30% ********* 6/20 = 3/10 = 30% --------------------- 11 B yes 10, not c 9 typos 8 D right 7 not B 6 not A 5 not D 4 not A 3 not C
*January 11, 2016*

**Math**

x = 65 - 2 y 2 (65 - 2 y) + 3 y = 105 solve that for y
*January 11, 2016*

**Math**

-3 x + 6 y = 18 - x + 6 y = 18 -------------------subtract -2 x = 0 x = 0 y = 3 So I get x = 0
*January 11, 2016*

**Math**

Well, usually increasing means going up to the right. (positive slope) Decreasing means going up to the left (negative slope) The question is poorly worded since the English words "goes up" really do not tell you the mathematical direction :)
*January 11, 2016*

**Math**

x + y = 90 x = 2 y - 30 (use that for x) ------------------------------ (2 y - 30) + y = 90 3 y = 120 y = 40 so x = 50
*January 11, 2016*

**Ms.Sue, Reed**

I do not see your answers. Try *******
*January 11, 2016*

**Chemistry-Dr.Bob**

Huh - who says? diesel is usually ignited (except when starting cold) by the increase in pressure and temperature resulting from compression in the cylinder. Gasoline generally requires a spark plug. (unless the cylinder or deposits in the cylinder get so hot they ignite ...
*January 11, 2016*

**PHYSICS**

ah - cute demo : http://www.youtube.com/watch?v=az1_4WjadlU
*January 11, 2016*

**PHYSICS**

Well, I suppose, but only in the sense that it is hard to change the direction of the axis of rotation. A bicycle is also stabilized by the rotation of the tires. The faster the spin, the more torque is needed to turn or tip the wheels. (torque = rate of change of angular ...
*January 11, 2016*

**math**

Do you mean the distributive property of multiplication? http://www.mathsisfun.com/definitions/distributive-law.html
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

For the Mayan one you only need the title
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

http://www.tulane.edu/~woodward/olemiss.htm
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

http://www.motherjones.com/rights-stuff/2011/01/no-haiti-no-louisiana-purchase
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

http://www.gilderlehrman.org/history-by-era/imperial-rivalries/timeline-terms/encomienda-system-established
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

http://mayantimeline.blogspot.com/p/science-and-technology.html
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

Miranda, I would be happy to help if you demonstrated any sign of having read about this at all. Please Google the subjects if you do not have a text book. It would do more harm than good for me to just tell you my answers. This is not even my subject.
*January 11, 2016*

**HISTORY HELP ME FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

Hey, you try first, then we help if needed. I do not needed for most of them. The Maya one is pretty funny !
*January 11, 2016*

**algebra**

fn = a + d(n-1) f(7) = a + 6 d = 72 f(10) = a + 9 d = 90 so 3 d = 90 - 72 = 18 d = 6 a + 6*6 = 72 a = 36 so our sequence is f(n) = 36 + 6(n-1) f(2) = 36 + 6(1) f(2) = 42
*January 11, 2016*

**incomplete**

into what size sections?
*January 11, 2016*