Friday

September 30, 2016
Total # Posts: 27,213

**Social studies**

the vice president also serves as the ?

*January 20, 2016*

**Physics**

initial momentum = .021 *195 final momentum = (.021+1.6)Vi Vi = 2.53 (1/2) m Vi^2 = m g h h = Vi^2/2g

*January 20, 2016*

**Math**

Maybe you mean triple? if so 3 = (x)^5 log 3 = 5 log x log x = .095424 x = 1.2457 so 24.6 %

*January 20, 2016*

**maths**

4*3*9 = 108 50 + 12*25 = 350 350 - 299 = 51 10^6/10^3 = 10^3 = 1000 8cm / 8 km so 1 cm / 1 km

*January 20, 2016*

**Precalculus**

any point on the perpendicular bisector of AB satisfies your requirement. what is the slope of AB ? slope = (8-2)/(7+5) = 6/12 = 1/2 so the perpendicular has slope m = -2 It must go through the midpoint of AB which is at: x =(7-5)/2 = 1 y = (8+2)/5 = 2 or (1,2) so 2 = -2(1) + ...

*January 20, 2016*

**physics**

what again ? Google Einstein e = m c^2

*January 20, 2016*

**math**

(46 + 35 + 46 + 35) / 100

*January 20, 2016*

**Physics**

Google Einstein e = m c^2

*January 20, 2016*

**physics**

Defining z axis up: area of base of cylinder A= pi r^2 where r = 20 cm = .20 meter height of cylinder = .10 meter volume of cylinder V= pi r^2 h = pi (.2)^2 (.1) weight of cylinder W = g V = 10 V in Newtons b) +W c) -W d) W/A in Newtons/meter^2 or Pascals

*January 20, 2016*

**Physics**

the plane and the shell cover the same horizontal distance in time t T = angle up from horizontal u = 1100 cos T = 600,000/3600 m/s so T = 81.3 degrees so Vi = initial speed up = 1100sin 81.3 = 1087 m/s up how long to reach 2500 meters high? 2500 = 1087 t - 4.9 t^2 4.9 t^2 + ...

*January 20, 2016*

**Math**

10 a + b a + b = 7 so a = (7-b) 10 a + b - 10*2 - 7 = 10 b + a 10(7-b)+b-20-7=10b+(7-b) 70 -10b+b-27=9 b+7 36 = 18b b = 2 then a = 5 so 52

*January 20, 2016*

**actually math - series need math teacher**

Not physics until he jumps

*January 20, 2016*

**Calculus**

∫(2x^5+6x)^3(5x^4+3)dx becomes ∫(u)^3 du/2 = (1/2) ∫u^3 du BUT remember to change b = -1 to 2(-1)^5 +6(-6) =-2 -36 = -38

*January 19, 2016*

**Calculus**

lets' try u = 2 x^5 + 6 x then du = (10 x^4 + 6)dx = 2 (5 x^4+3)dx that looks more promising :)

*January 19, 2016*

**Calculus I think not**

du=x^5+3x+C ?? what is that all abot You add a constant to integral is no constraints on it. BUT NOT to the derivative if u = 5 x^4 + 3 then du = 20 x^3 dx period, the end but that is not what you want to do anyway

*January 19, 2016*

**Calculus**

I assumed you were integrating from 0 to x

*January 19, 2016*

**Calculus**

-(x+1)>0 x+1 < 0 x <-1 I seem to agree but try http://www.wolframalpha.com/input/?i=+integrate+6%2F%281%2B2x+%2B+x^2%29 Which agrees

*January 19, 2016*

**Geometry**

5' 4" = 63 " 3' = 36" 14' 3" = 171" 64/36 = h/171 36 h = 64 * 171

*January 19, 2016*

**Math**

I guess you mean y = (3/4) x + 4 and not y = 3 /(4x) + 4 if so then the slope = (3/4) y = (3/4) x + b 7 = 0 + b so b = 7 y = (3/4) x + 7

*January 19, 2016*

**i dont know how to solve this**

add 2 to both sides 3 x > 12 divide both sides by 3 x > 4 the only one greater than 4 is 5

*January 19, 2016*

**i dont know how to solve this**

If you mean: 6 + (2/3) x = 9 then (2/3) x = 3 x = 9/2 If you mean: 6 + 2/(3x) = 9 18 x + 2 = 27 x 2 = 9 x x = 2/9 If you mean: (6+2)/x = 9 x = 8/0 USE PARENTHESES

*January 19, 2016*

**Math**

The tens and the ones add to 16 ?

*January 19, 2016*

**I do not know**

I am having the same trouble and do not see the trick.

*January 19, 2016*

**Math - Help! ASAP**

looks fine to me

*January 18, 2016*

**social studies hurry**

In history? The Tigris and Euphrates rivers. Google Mesopotamia.

*January 18, 2016*

**social studies hurry**

I think everything you need to know is here: http://en.wikipedia.org/wiki/Iraq It is mainly Shia and Kurd and has both rural and urban populations. If I had to choose I might say urban because of Baghdad, Mosul and other big cities.

*January 18, 2016*

**social studies hurry**

What specific region?

*January 18, 2016*

**social studies help**

LOL - yes, Saddam Hussein of Iraq invaded Kuwait to get their oil. There was a war about it.

*January 18, 2016*

**social studies help**

Google Kuwait industry but really, watch the news

*January 18, 2016*

**help on math**

(3*12.5 + 17) * 1.06

*January 18, 2016*

**physics**

initial momentum = 7.05*8.24 + 0 final momentum = 7.05 * v + 1.53*13.2 final momentum = initial momentum

*January 18, 2016*

**social studies hurry**

Post them But you have not been watching the news much if you are having trouble with what Arabia and Iraq (Mesopotamia) look like.

*January 18, 2016*

**math help please**

.8*36.95 + .667*21.42

*January 18, 2016*

**Physics**

orbit circumference = 2 pi *1.9*10^7 miles time for orbit trip = 2.9*10^7 s speed = 2 pi *1.9 / 2.9 miles/second = 4.12 miles/second You did not say what units in miles per hour, multiply by 3600 and get 14,820 miles/hour

*January 18, 2016*

**physics**

Xray or Gamma ray

*January 18, 2016*

**physics**

E = h f = 6.626 *10^-34 f Joules 1 ev = 1.6 * 10^-19 J so E is 15*10^3 *1.6*10^-19 J = 24 * 10^-16 Joules so 24 * 10^-16 = 6.626*10^-34 f f = 3.62 * 10^18 Hz now go look at your spectrum if it is by wavelength lambda = 3*10^8/(3.62*10^18) = .828 * 10^-10 = 8.28 * 10^-11 meters

*January 18, 2016*

**math help please**

1.2 * 7.65 * 40

*January 18, 2016*

**Math fourth grade**

1 and itself

*January 18, 2016*

**math**

x and y in first quadrant if sin x = 1/4, we will need cos x sin^2 x + cos^2 x = 1 cos x = sqrt( 1-1/16) = sqrt (15/16) = (1/4) sqrt 15 similarly if cos y = 1/5 sin y = sqrt (1- 1/25) =sqrt (24/25) = (1/5)sqrt 24 now with sin x = .25, cos x = .25 sqrt 15 and sin y = .20 sqrt ...

*January 18, 2016*

**Physics**

The package has the same horizontal velocity component as the plane. (Note- if you drop a bomb at low altitude, turn your airplane immediately after release) Fall of 235 m 235 = (1/2)g t*2 = 4.9 t^2 t = 6.93 seconds to fall horizontal problem d = u t d = 69.4 * 6.93 = 481 ...

*January 18, 2016*

**Physics**

First vertical problem: Vi = 75.2 sin 34.5 = 42.6 m/s v = Vi - g t g = 9.81 m/s^2 so v = 42.6 - 9.81 t at the top, v = 0 t = 42.6/9.81 = 4.34 seconds to top 2 t = 8.68 seconds total in air range = 8.68 * 75.2 cos 34.5 at t = 1.5 v = Vi - g t = 42.6-9.81(1.50) = 27.9 m/s u = 75...

*January 18, 2016*

**Math ASAP**

-6w - 30 - 9 = -6 w - 39 ========================= 2 x + 3 x - 3 x = 2x -6 + 18 = +12 so 2 x + 12

*January 18, 2016*

**Pre-Calc**

1/sin^2x = 4 so sin^2 x = 1/4 so sin x = +1/2 or -1/2 four solutions, yes

*January 18, 2016*

**Physics**

It fall more than a meter? checking Yes, 1.129 m ========================== sorry, I am used to y up Vi = 250 sin T u = 250 cos T t = 120/u = 120/250 cos T h = Hi + Vi t - 4.9 t^2 here we on the same level so h = Hi 0 = Vi t -4.9 t^2 t (4.9 t - Vi) = 0 obviously it is at ...

*January 18, 2016*

**Physics**

momentum before = momentum after 50 * 10 + 100 * 0 = 150 * v

*January 18, 2016*

**Chemistry**

The pressure depends on the average (1/2)mv^2 of the gas molecules but it is (1/2) m v^2 that you get from kinetic theory and not (1/2) v^2 the gas has the same kinetic energy at temperature T no matter what its mass might be. see: http://hyperphysics.phy-astr.gsu.edu/hbase/...

*January 18, 2016*

**Physics**

in time t vehicle A travels distance d vehicle B travels distance (d-819.017) 93.602 t = d 44 t = d-819.017 so 44 t = 93.602 t -819.017

*January 18, 2016*

**Chemistry 101**

12.52 lbs = 5.68 kg = 5680 grams well first of all the volume of water does not change. The same water is still there unless it splashed out. However the final volume of stuff in the cylinder increases by the volume of lead which is 5680 grams (1 cm^3/11.3 grams) = 503 cm^3 = ...

*January 18, 2016*

**ap physics**

m2 g = m1 v^2/r

*January 18, 2016*

**AP Physics**

Vi = 4 sin 25 down so = -1.69 m/s u = 4 cos 25 forever = 3.63 m/s Hi = 1.2 h = Hi + Vi t -4.9 t^2 0 = 1.2 - 1.69 t - 4.9 t^2 4.9 t^2 + 1.69 t - 1.2 = 0 t = [ -1.69 +/- sqrt(2.86+23.5)]/9.81 t = .815 seconds d = u t = 3.63 * .815 = 2.96 meters

*January 18, 2016*

**check earlier volume of pipe **

Check earlier problem. diameter not radius was given

*January 18, 2016*

**Chemistry 101**

r = 6.5/2

*January 18, 2016*

**Physics**

same as any other distance = speed * time problem time = (.97/20) seconds of course we did not use the diameter bit but perhaps there is a part B ?

*January 18, 2016*

**Math**

You are welcome.

*January 18, 2016*

**Math**

ok BOTTOM/SIDE = bottom/side 9/x = 4/2 which happens to be what we did.

*January 18, 2016*

**Math**

well you do not show it but perhaps 4/2 = 9/x in which case x = 4.5 but I do not know what your triangles look like if the corresponding sides are not as I assumed then the right answer could be 18

*January 18, 2016*

**typo**

I mean -1/(-1/4) = +4

*January 18, 2016*

**Algebra (Urgent)**

the slope must be 1/(-1/4) which means m = +4 the first one is a yea y = +4 x - 2 the second one is a yes y = +4 x + 0 the third one is a no y = (1/4) x - 6 the fourth one is a yes y =+4 x + 3 Please check your reply Lady P

*January 18, 2016*

**Math**

3x+4 = 16 and 3x+4 = -16 x = 4 and x = -20/3

*January 18, 2016*

**Physics**

10.5 u = (10.5+104) v F = m a = -.658 m g so a = -.658(g) work done = F d = m (.658)(g) (6.66) work done = Ke after collision so (1/2) m v^2 = m(.658)(g)(6.66) v^2 = 2(.658)(g)(6.66) solve for v then u = (10.5+104) v/10.5

*January 18, 2016*

**MATHS**

a = X a r = X+1 so r = (X+1)/X a r^2 = X+4 so X [(X+1)/X ]^2 = X + 4 (1/X)(X^2 + 2 X + 1) = X + 4 X^2 + 2 X + 1 = X^2 + 4 X X = 1/2

*January 18, 2016*

**Math**

say base is a 6 by 6 square then 4 blocks will sit on it then another layer fits so 8

*January 18, 2016*

**Physics**

how long to fall from 50 m? h = (1/2) g t^2 t = sqrt (2 h/g) = srt (100/9.81) = 3.19 seconds d = u t = 40 * 3.19

*January 18, 2016*

**math multiply binomials by trinomials ( really need help)**

Now the only trinomial is at e) (x-2y)^2 = x^2 - 4 x y + 4 y^2 now we multiply that by (3x-6y) use distributive property (a+b)(c+d+e) = a(c+d+e) + b(c+d+e) so we have +(3x)(x^2 - 4 x y + 4 y^2) -(6y)(x^2 - 4 x y + 4 y^2) = +3 x^3 - 12 x^2y + 12 xy^2 -0 x^3 - 6 x^2 y + 24 xy^2...

*January 17, 2016*

**math multiply binomials by trinomials ( really need help)**

well, we do not need the distributive property if you know FOIL I do not dare to do a) because I do not know if you mean (1/5)x or 1/(5x) when you write 1/5x b) (2a-3)(2a-3) = 4 a^2 - 12 a + 9 -(3a+4)(3a-4)= -9 a^2 + 0 a +16 2(3a+1)(3a+1)= 18a^2 + 12 a + 2 add 13 a^2 + 27 etc

*January 17, 2016*

**Physics pleasse use ^**

Ms = 2.13 * 10^5 Me Me = Me Ms x = Me (d-x) x/(d-x) = Me/Ms = 1/ (2.13*10^5) x<<<< d so assume x/d = 1/(2.13*10^5) x = 7.87 *10^8/(2.13*10^5) x = 3.69 * 10^3 = 3690 km check 3690 is indeed <<<< 7870*10^5 :)

*January 17, 2016*

**Science Help**

The number of molecules and their mass does not change however the volume increases if the balloon expands so mass/ volume decreases

*January 17, 2016*

**algebra**

F = k * w * v^2 /R 182 = k (1800) (900)/600 k = .0674 F = .0674 (1800) (2025)/650 = 378 pounds

*January 17, 2016*

**math**

3/8 + 1/3 = 9/24 + 8/24 = 17/24 24/24 - 17/24 = 7/24 but are you sure you did not spend 1/3 OF THE REMAINDER on snacks?

*January 17, 2016*

**Calculus/ Application Of Derivative**

I get A = pi r^2 = 75 pi r = 5 sqrt 3 so dV = pi (75) dh dV/dt = 75 pi dh/dt so dh/dt = .5 m^3/min / (75 pi m^2) .5/(75 pi) = .00212 m/min

*January 17, 2016*

**Calculus/ Application Of Derivative**

http://www.jiskha.com/display.cgi?id=1453063814#1453063814.1453064668

*January 17, 2016*

**scroll down**

I JUST DID THIS !!!

*January 17, 2016*

**algebra**

d = k t^2 64 = k (2)^2 so k = 64/4 = 16 then d = 16 (15)^2 d = 16 * 225 d = 3600 feet ============ check g = 32 ft/s^2 h = (1/2) g t^2 = 16 t^2 yes

*January 17, 2016*

**History**

We seem to be talking about the era of Cyrus etc well, back then most religions had gods for just about everything.

*January 17, 2016*

**algebra 2**

we want 10 y in both so mutiply the whole first equation by 2 -12 x + 10 y = +8 +7 x - 10 y = -8 -----------------------add - 5 x = 0 well, x = 0 then 5 y = 4 so y = 4/5 or -10 y = -8 so again y = 4/5 (that was a check) the lines intersect at (0 , 4/5 )

*January 17, 2016*

**Maths**

Trick: at depth h the volume increase with delta h = the surface area * delta h draw that and remember it. surface area = pi r^2 what is r of surface at h = 5 ? that takes some geometry triangle from center 5^2 + r^2 = 10^2 r^2 = 75 r = 5 sqrt 3 so dV = pi (75) dh dV/dt = 75 ...

*January 17, 2016*

**I do not know**

rounding to what? nearest whole number (4,3) to one decimal place? ( 4.3 , 3.3 ) to two places (4.35 , 3.33) etc etc etc

*January 17, 2016*

**Math**

(0,0) is the origin. I do not know where you drew it on your piece of paper :) (it might be way over on the lower left :)

*January 17, 2016*

**math**

b/g = 8/7 so b = (8/7) g b + g = 195 (8/7) g + (7/7) g = 195 15 g = 7 * 195 g = 7 * 195 / 15 etc

*January 17, 2016*

**what?**

I can not figure out what you mean. y = 6 * 4^2x + 2 or y = 6 * 4^(2x + 2) or y = 6 * 4^2 * x + 2 or y = 6 * 4^2 * (x + 2) and none of the above ca be expressed as y = A b x as far as I know

*January 17, 2016*

**Physics**

The horizontal speed of the supplies during the fall is the airplane speed (if you drop a bomb, then turn, because if you go straight it hits under you :) so how long to fall 160 meters? (1/2) g t^2 = 60 t^2 = 120/g = 120/9.81 t = 3.5 seconds

*January 17, 2016*

**already answered**

heat depends how far vertically down the ramp d sin theta

*January 17, 2016*

**please define terms - typo???**

total cost ? = 1200 = 2 * 600 so q = 600 ? Total revenue? = 3 q = 1800 ?? Makes no sense Perhaps cost = 1,200 PLUS 2 Q ???

*January 17, 2016*

**for what**

6 a + 3 c = what is the question

*January 17, 2016*

**physics**

According to the de Broglie hypothesis, every object in the universe is a wave, a situation which gives rise to this phenomenon. The position of the particle is described by a wave function \Psi(x,t). The time-independent wave function of a single-moded plane wave of ...

*January 17, 2016*

**physics**

Look here maybe: http://en.wikipedia.org/wiki/Uncertainty_principle particularly the wave probability stuff.

*January 17, 2016*

**physics**

If you are into modern physics, there is a low but finite possibility of anything. In fact you might not be there where you think you are at all. Luckily you usually are on the same side of the wall you were before you did not move.

*January 17, 2016*

**Math**

Yes 80 gal * (8 pints/gal ) = 640 pints

*January 17, 2016*

**Math**

80 gallons is indeed more than 350 pints

*January 17, 2016*

**Math**

2/9 boys b 7/9 girls g b = (2/7) g or g = (7/2) b g - 250 = b (7/2) b - b = 250 (5/2) b = 250 5 b = 500 b = 100

*January 17, 2016*

**Math link to sinking fund formula**

for example http://www.math.utep.edu/Faculty/cmmundy/Math%201320/Worksheets/Sinking%20Funds%20&%20Annuities.pdf

*January 17, 2016*

**Math**

.052/4 = .013 = r so multiply by 1.013 every quarter year n = number of quarter years Google amount of a sinking fund S = 250 [(1+r)^n - 1 ] /r 6500 /250 = 26 = [(1+r)^n - 1 ] /r 26 = [ 1.013^n - 1 ]/.013 .338 = 1.013^n - 1 1.338 = 1.013^n so n log 1.013 = log 1.338 n (....

*January 17, 2016*

**Math**

Yes :)

*January 17, 2016*

**Math**

NO!!!! the whole point of my reply was .625 < .626

*January 17, 2016*

**Math**

but 5/8 = .625

*January 17, 2016*

**Maths lit, geography ,agricultural science. Life science**

How is a retired physicist in the United States supposed to be able to help with this? You must talk to the guidance person in your own school in your own country and follow your own wishes, not mine. If you have a math or physics problem, that is another matter :)

*January 17, 2016*

**math,eng,phy,chem,bio,geography,economics**

You used 8.99 - 3.65 = 5.34 g O2 for 8.99 g of Sc 5.34 + 8.99 = 14.33 g total Sc2O3 5.34 / 14.33 = .373 or 37.3 % ============================ check O3 = 3 * 16 = 48 Sc2 = 2 * 45 = 90 total molecular mass = 138 48/138 = .347 or 34.7 % looks like the experiment was a little off :)

*January 17, 2016*

**sorry, do not understand experiment**

What is the reaction you mean?

*January 17, 2016*

**Physics**

together we make 7+5 = 12 opposite we make 5-7 = -2

*January 17, 2016*