Saturday

February 13, 2016
Total # Posts: 25,219

**maths**

A -- 1 tank/ 12 h = .08333 tank/hr B -- 1 tank/ 15 h = .06666 tank/hr C -- 1 tank/ 20 h = .05000 tank/hr time t hours .08333 t + .06666(t/2) +.05000(t/2) = 1 tank .14167 t = 1 t = 7.06 hours
*January 10, 2016*

**Physics**

How long to do 2 pi radians ? (a full circle) 1.06*10^-7 t = 2 pi t = 5.93 * 10^7 seconds how many seconds/day 1 day = 24*3600 s = 86400 s = 8.64*10^4 s 5.93 *10^7 / 8.64*10^4 = 6.86 * 10^2 days = 686 days
*January 10, 2016*

**dips international Jalandhar**

(360 km / 6 hours) * 9 hours = 540 km
*January 10, 2016*

**MATHS**

the slope of your line is 1/4 so the slope of any line parallel to it is 1/4 the slope of a line perpendicular to it is -1/(1/4) = -4
*January 10, 2016*

**Physics**

energy before hit = m g h = .2 * 10 * 20 = 40 J energy after hit = 10 J m g h = 10 2 h = 10 h = 5 meters
*January 10, 2016*

**maths**

Do you know how to copy a triangle congruent to the one in front of you? If you do that, you have your angle :) http://www.wikihow.com/Construct-Copy-of-a-Triangle
*January 10, 2016*

**mathematics**

sin Theta = 1/2 Theta = 30 degrees ( Very unsafe )
*January 10, 2016*

**physicss**

I can not be more mathematical than to say if you double the distance you divide the force by 4 2^2 = 4
*January 10, 2016*

**physicss**

force inversely proportional to distance squared (1/4)5 You can only do the second part if you know that the charges are equal. then as you pointed out Q^2 = 5/k
*January 10, 2016*

**math**

maybe sin (theta/2 ) = r/h
*January 10, 2016*

**Math!!!**

.78 http://stattrek.com/online-calculator/normal.aspx
*January 9, 2016*

**science**

Nah, how about oxidation of a hydrocarbon, particularly combustion? http://www.intel.com/content/dam/www/program/education/us/en/documents/project-design/react/react-presentation.pdf
*January 9, 2016*

**Math**

41.25/75 = 0.55 = decimal fraction of original price 0.55 * 100 = 55 % = percent of original price 100 - 55 = 45% = percent discount off original price
*January 9, 2016*

**Math**

You are welcome.
*January 9, 2016*

**Math**

1-0.40 = 0.60 0.60 * 475 = $285
*January 9, 2016*

**Maths**

c = a + n k 820 = a + 80 k 1040 = a + 124 k -----------------subtract -220 = -44 k so k = 5 820 = a + 80*5 = a + 400 a = 420 so c = 420 + 5 n if n = 180 then c = 420 + 80(180) c = 420 + 14,400 c = 14,820
*January 9, 2016*

**Geography**

If they drop their languages and customs and take up yours, they are more likely to be assimilated.
*January 9, 2016*

**Geography**

That is what your paragraph says.
*January 9, 2016*

**Maths**

11/x - 6/x = 3-3 5 = 0 x x = 5/0 which is undefined
*January 9, 2016*

**Algebra**

You are welcome.
*January 9, 2016*

**Algebra**

yes, y is 8 but it asked for z z = y-3 = 5
*January 9, 2016*

**Algebra**

3 cent = x 12 = y 15 = z x = 3 y z +3 = y 3 x + 12 y + 15 z = 243 3 (3y) + 12 y + 15 (y-3) = 243 get it ?
*January 9, 2016*

**Social Studies**

So what was number 1?
*January 9, 2016*

**Social Studies**

I guess so: http://www.pinterest.com/pin/520095456946189750/
*January 9, 2016*

**Social Studies**

Inuit dried tea leaves????
*January 9, 2016*

**Social Studies**

3.which groups make up Canada aboriginal population (select three) a.Quebecois**** NO WAY !!!!
*January 9, 2016*

**Geography**

what does this have to do with religious fundamentalism for example?
*January 9, 2016*

**Geography**

Sounds like a hierarchy to me.
*January 9, 2016*

**Who knows?**

We do not see your drawing.
*January 9, 2016*

**History. Please Help!**

You 2 b answer amuses me though because I am from Massachusetts.
*January 9, 2016*

**History. Please Help!**

I do not think so.
*January 9, 2016*

**History. Please Help!**

http://www.georgiaencyclopedia.org/articles/history-archaeology/mary-musgrove-ca-1700-ca-1763
*January 9, 2016*

**History. Please Help!**

1. No No No !!!!! wrong end of the continent
*January 9, 2016*

**Geography**

Yes.
*January 9, 2016*

**Physics- just verfiying an equation**

m r omega^2 is exactly the same as m v^2/r but the second may be an easier way to understand it. remember v = omega * r where v is tangential velocity (along the circumference if a circle)
*January 9, 2016*

**Math**

15 (77.28/4)
*January 9, 2016*

**Math**

4.5 hours 180 miles speed = 180/4.5 miles/hour
*January 9, 2016*

**English**

Please use one name and look up the Bill of Rights.
*January 9, 2016*

**English**

Go ahead. I will stick to quoting the Fourth.
*January 9, 2016*

**English**

The Fourth Amendment to the Constitution of the United States. Google Fourth Amendment
*January 9, 2016*

**English**

4. The right of the people to be secure in their persons, houses, papers, and effects against unreasonable searches and seizures shall not be violated and no warrant.....
*January 9, 2016*

**math10**

.9*.9 = .81 19%
*January 9, 2016*

**history**

They kept everyone out but a few Dutch traders. They particularly evicted the Catholic missionaries. It was the United States that finally opened the country up, and they did not have imperialistic motives. They adopted modern weaponry from the West as soon as they saw it. ...
*January 9, 2016*

**math10**

can you do better than 3+2 </= 6 ?
*January 9, 2016*

**math10**

LOL a^2 - b^2 = (a+b)(a-b) so 23 - 408 = (sqrt(23) -sqrt....
*January 9, 2016*

**math10**

x = 2^100 log x = 100 log 2 y = 3^60 log y = 60 log 3 z = 10^30 log z = 30 log 10 which log is lightest?
*January 9, 2016*

**math10**

well if x = 0 that is 3
*January 9, 2016*

**math10**

that is always + because even power is + so if we find a plus x, its negative mate will also work x^6 + x = 7 x(x^5 + 1)= 7 if 0<x<1 no way if x = 2, way too big so between 1 and 2 1.2 ---> 4.18 1.3 ---> 6.12 So there is one between 1 and 2 that works, and its ...
*January 9, 2016*

**physics dimension**

I showed you what to do yesterday. Try it yourself and I will try to remember to come back and review.
*January 9, 2016*

**Science**

I guess they never heard of a sonogram :)
*January 9, 2016*

**science**

It is impossible to answer. The way sonar works is that you determine how far away a reflecting object is by the time the pulse takes to get there and back. Without giving the time between ping and return, the question is meaningless.
*January 9, 2016*

**Math**

Now you should be able to do this one with the methods I showed you. In fact, just solve it.
*January 8, 2016*

**Math**

34 is not 32 but the slopes are the same so they are parallel, never cross NO solution
*January 8, 2016*

**Math**

y = -(5/6) x + 4 and y = -(2.5/3) x +6 -(5/6) is equal to -(2.5/3) so these two lines are the same line. There is a solution for every x, an infinite number.
*January 8, 2016*

**physics dimention**

y has no units r is length h is length g is length/time^2 so we have length^3/time^2 but for force we need m a or mass *length/time^2 we have g in there. I suspect we need mass :)
*January 8, 2016*

**physics dimensions**

A length B length/time or velocity C length/time^2 or acceleration
*January 8, 2016*

**Math**

Whew, we agree :)
*January 8, 2016*

**Math**

slope = (4-3)/(8-6) = 1/2 1/2 = (-2-4)/(n-8) n-8 = -12 n = - 4
*January 8, 2016*

**Math**

8 am at 0 8:18 at 4.5 8:48 at 7.5 miles ??? 18 min = .3 hour 48 min = .8 hour in first .3 hours speed = 4.5/.3 = 15 mph in next .5 hours = speed = 3/.5 = 6 mph average speed for the whole trip = 7.5 miles/.8 hours = 9.375 mph
*January 8, 2016*

**Math**

initial value = Vi after one year v = .8 Vi after two years v = .8 Vi *.88 after three years v = .8 Vi *.88 * .88 = .61952 Vi 1 -.61952 = .38048 so 38.048 percent
*January 8, 2016*

**Math**

2.04 * 10^7 = x * 1.025 x = 1.990243902*10^7 = 19,902,439
*January 8, 2016*

**Math**

3 1/5 / x = 4 1/2 ???? 16/5 / x = 9 / 2 or 9 x / 2 = 16/5 9 x = 32 / 5 x = 32 /45 --------------------- check 3.2/(32/45) = 4.5 ???? 32/45 = 3.2/4.5 heavens to Betsy, it is true :)
*January 8, 2016*

**mechanics**

You can get all of this from the first problem I did for you. I am beginning to get irritated.
*January 8, 2016*

**Math**

You are welcome :) That was fun !
*January 8, 2016*

**Math**

NOW if m = -1/m' Then it the lines are PERPENDICULR and they ARE -1/3 and 3 so it is not only a parallelogram but a RECTANGLE
*January 8, 2016*

**Math**

Get it now? Opposite sides have the same slope. GRAPH it carefully. I saw it on my quick sketch before I calculated slopes
*January 8, 2016*

**Math**

HE = (5+1)/(-3+5) = 3 GF = ((2+4)/(6-4) = 3 LOL, sketch wins, they are parallel NOW top and bottom FE = (5-2)/(-3-6) = 3/-9 = -1/3 GH = (-1+4)/(-5 -4) =3/-9 =-1/3 caramba! paralleogram
*January 8, 2016*

**Math**

sketch graph. Looks like a parallelogram but hang on. Might even be a rectangle:)
*January 8, 2016*

**now now, I already did it**

Hey, hang on and scroll down
*January 8, 2016*

**physics**

LOL, I just did most of this in your problem below.
*January 8, 2016*

**physics**

I assume that you are doing this a significant r>>Re so that you can not assume a constant g. It is easiest to do this with potential energy ---> kinetic energy define potential energy zero at infinity that way it is always negative, the more negative the faster. That...
*January 8, 2016*

**Calculus @ Henry**

dV = surface area * dh so dh/dt = dV/dt/surface area = Q/area
*January 8, 2016*

**Algebra**

http://www.jiskha.com/display.cgi?id=1452283876#1452283876.1452284419
*January 8, 2016*

**Algebra**

did I not do this right below here?
*January 8, 2016*

**Algebra help pls fast**

I assume you mean 8 by 8 on the bottom and 22 high. slant height from the center of a side of the base to top sqrt (4^2 + 22^2) = sqrt(500) = 10 sqrt 5 for altitude of one triangular side then A = 4 [(1/2) b h] = 2 (8)(10sqrt5) = 160 sqrt 5
*January 8, 2016*

**Math**

Well done John.
*January 8, 2016*

**I disagree with you.**

.7 * 500 = 350 2400/64 = 37.5 % 260/6.5 = 40% .2*140 = 28
*January 8, 2016*

**Pre-Algebra Help pls fast**

http://www.jiskha.com/display.cgi?id=1452283876#1452283876.1452284419
*January 8, 2016*

**health and pe**

yes detox
*January 8, 2016*

**Physics typo**

typo 147.05 J for #4
*January 8, 2016*

**Physics**

Take potential = 0 at ground level as instructed. 1. m g h = 4 * 9.81 * 1.25 =49.05 J 2. (1/2) m v^2 = .5*4*49 = 98 J 3. No friction so PE + Ke = constant = 49.05 + 98 = 147.05 J by the way that means when it stops at the top it should have potential energy of 147 J 147 = m g ...
*January 8, 2016*

**Algebra**

10- 3 = 7 8 - 3 = 5 6 - 3 = 3
*January 8, 2016*

**physics**

centripetal acceleration = v^2/r = 9/7.5 = 1.2 m/s^2 weight down = 9.81 m tension up = 495 so 495 - 9.81 m = m (1.2) 495 = m (11.01) m = 45 kg
*January 8, 2016*

**Not finished yet Mel?**

Hey, where are you ?
*January 8, 2016*

**What do you plan to do while I do your calculus?**

At least show some effort before asking some poor old retired guy to do it all.
*January 8, 2016*

**Calculus**

hint dh/dt * surface area = 4 cm^3/min
*January 8, 2016*

**Calculus**

find ds/dt when it reverses ds/st = 0 find the acceleration d^2s/dt^2 then
*January 8, 2016*

**Calculus**

L = 30 - 2 h w = 16 - 2 h V = L * w * h V = (30-2h)(16-2h)h take dv / dh and set it to zero use only resulting h values that do not give you negative w when you subtract 2 h from 16
*January 8, 2016*

**Calculus**

if y = 3x^(1/3) + 6x^(4/3) then dy/dx = x^-(2/3)+ 8 x^(1/3) and d^2y/dx^2 =-(2/3)x^-(5/3)+(8/3)x^-(2/3) extrema or inflection where dy/dx = 0 note slope undefined when x = 0 dy/dx = x^-(2/3)+ 8 x^(1/3) = 0 or 1/x^(2/3) = - 8 x^(1/3) 1 = -8 x x = -1/8 so what is d^2/dy^2 when x...
*January 8, 2016*

**History**

Well, best read up on it but I might be inclined to pick the first.
*January 8, 2016*

**History**

I am sure it is not C. Although John Smith did sail around here and actually named parts of Cape Ann in Massachusetts, he is known mainly for hanging out down around Virginia. Neither of those people was particularly easy to get along with.
*January 8, 2016*

**p.e**

I am going to contest my heredity and see if it helps.
*January 8, 2016*

**Aluminum powder Separation**

Is any of that stuff magnetic? Does any of it dissolve in anything handy?
*January 8, 2016*

**science**

Well, yes, but I would be more like does not absorb as much as dark colors do.
*January 8, 2016*

**History**

D is correct.
*January 8, 2016*

**maths**

volume of anything pointy with straight sides = (1/3) height * area of base so V = (1/3)(8)(4) pi for sphere V = (4/3) pi r^3 so (4/3) pi r^3 = (1/3)(32 pi) r^3 = 8 r = 2 diameter = 2 r = 4 cm
*January 8, 2016*

**Math**

http://www.mortgagecalculator.org/
*January 8, 2016*

**History Help pls**

I would be inclined to go with A
*January 8, 2016*

**History Help pls**

check out http://www.sciway.net/afam/slavery/houses.html
*January 8, 2016*

**History Help pls**

well, google slave plantations maybe
*January 8, 2016*