Saturday

August 27, 2016
Total # Posts: 26,824

**Chemistry**

Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
*August 27, 2016*

**physics**

weight = normal force = m g = 50 * 9.81 Newtons static force = .4 * 50 * 9.81 moving force = .3 * 50 * 9.81 assume use entire static force or it will not accelerate .1*50*9.81 = m a = 50 a so a = .981 m/s^2 v = a t = .981 * 5
*August 27, 2016*

**physics**

g = 9.81 m/s^2 v = Vi - g t at top v = 0 t = 25/9.81 seconds to top double that for time in air m g h = (1/2) m Vi^2 h = 625/(2*9.81) v is 0 at top of course a is -9.81 m/s^2 forever until it hits the mud.
*August 27, 2016*

**Computer Applications**

maybe something like this: n = 101 sum = 101 1 if n = 199 quit n = n+2 sum = sum + n go back to 1 quit ---> print the sum and end
*August 27, 2016*

**physics**

In the Google search engine input: 40 mph = km/h You will find 64.3738 km/h which is 62373.8 meters/h which is 62373.8 meters/h (1 h/60 min) in meters/min times 3 for 3 minutes 64.3738 km/h * 1 h/3600 s) * t = 1 km so t = 3600/64.3738 seconds
*August 27, 2016*

**Physics. Pleaseee helpppp**

calculate the potential energy in the center 4 k 2 Qe^2/half diagonal^2 then calculate it at the center of a side 2 k 2 Qe^2/ half side^2 + 2 k 2 Qe^2/diagonal^2 the difference in potential energy is the work done
*August 27, 2016*

**Physics**

short answer: 40% above water 60% below water :) long answer: volume of wood = 60 kg (1 m^3/600kg) = 0.1 m^3 volume of wood under water (see Archimedes) = 60 kg (1 m^3/1000kg) = 0.06 m^3
*August 27, 2016*

**Science**

step by step do [sqrt(16+9)]^2 = 5 sqrt(25+144) = sqrt(169) =13 or simply sqrt (16+9+144)
*August 27, 2016*

**math**

half length of diagonal = 8 look at B to center of that diagonal now have 8, 6, 10 right triangle area of that triangle = (1/2)8 *6 there are 4 of those trianges on the rhombus 16 * 6 = 96 or half product of diagonals (1/2)(16*12) = 96
*August 27, 2016*

**math**

http://www.wikihow.com/Calculate-the-Area-of-a-Rhombus
*August 27, 2016*

**Chemistry**

Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...
*August 26, 2016*

**math**

make a list take differences ---- 71 ** 16 87 ** 16 98 ** 16 110 the differences are all 16 71-16 is the answer :) 55
*August 26, 2016*

**Algebra**

It is a straight line when y = 0, x = 8 so put a dot on the x axis at x = 8 when x = 0, y = -8/5 = - 1.6 so put a dot on the y axis at y =-1.6 Draw a straight line through those two dots. The end
*August 26, 2016*

**MATH HELP**

|-3| = 3 |+3| = 3 so two numbers on a number line have the same absolute value , |-3| and |+3|
*August 26, 2016*

**Physics**

d = (1/2) g t^2 = 4.9 t^2 at t = 0, d = 0 at t = 1, d = 4.9 at t = 2, d = 4.9*4 at t = 3, d = 4.9 * 9 so from t = 1 to t = 3 it falls 4.9 (9-1) = 4.9*5
*August 26, 2016*

**Math**

60 = 10*6 = 5*12 12-5 = 7 remarkable
*August 26, 2016*

**Algebra**

(x-1)^2+(y-2)^2 = r^2 (-4-1)^2 + (-3-2)^2 = r^2 that should get you under way.
*August 26, 2016*

**Algebra**

I told you all but B and E Make sure you understand C, how to express a repeating decimal as a ratio of whole numbers (rational) using infinite geometric sequence.
*August 26, 2016*

**Algebra**

any number with pi in it is not rational. any number with sqrt 7 in it or sqrt 2 in it is not rational all the others can be expressed as a ratio of whole numbers. 13/1 3.454545454545..... = 3 + 45/100 + 45/10,000 + 45/ 1,000,000 etc = 3 + 45/100 + 1/100 (45/100)+ 1/100^2 (45/...
*August 26, 2016*

**Geomentry**

5526316/10,000,000
*August 26, 2016*

**english**

her wrist weighs 100 pounds???? LOL
*August 26, 2016*

**Physics**

you need to know how many cm of rain fell and the area of the city. 1 cm^3 = 10^-3 kg = 10^-6 tons need depth of water in cm * area of city in cm^2 to get volume in cm^3 multiply that by 10^-6 to get tons.
*August 26, 2016*

**math**

do you mean? | 3 7 8 | | 2 2 6 | | 7 9 3 |-| 6 7 8 | | 7 9 9 | | 5 8 6 | is | 1 5 2 | | 1 2-5 | | 2 1 3 |
*August 26, 2016*

**math**

hey, I did the one above.
*August 26, 2016*

**math**

That comes out 4,34/3,26 so I think you gave me another typo.
*August 26, 2016*

**math**

http://www.gregthatcher.com/Mathematics/GaussJordan.aspx
*August 26, 2016*

**math**

1/6 x = 1/8 y - z = -24 assume you mean 1/6 x + 1/8 y - z = -24
*August 26, 2016*

**math**

3 5 seems pretty obvious
*August 26, 2016*

**math**

a) 12 * 250 = b) 12 * 250 * 100 / 22,000 =
*August 26, 2016*

**12th grade physics**

1000cos[ sin^-1 (15/40) ] or 1000 [ sqrt(1600-225)]/40
*August 26, 2016*

**Social Studies (Check Answers) Last Time**

14 I disagree with you.
*August 25, 2016*

**Pre-calculus**

vertex at point (v,v) axis parallel to x, opening right (y-v)^2 = 4a(x-v) so (-2-v)^2 = 4 a (6-v) and ( 4-v)^2 = 4 a (3-v) ======================now plug and chug 4 + 4v + v^2 = 24 a - 4 a v 16- 8v + v^2 = 12 a - 4 a v ----------------------------- -12 +12v = 12 a or a = v-1 4...
*August 25, 2016*

**Calculus**

dV = surface area * dr for a sphere dV = 4 pi r^2 dr dV/dt = 4 pi r^2 dr/dt 5 = 4 pi r^2 (3) r^2 = 5/(12 pi)
*August 25, 2016*

**METRIC CONVERSION**

0.86 http://www.google.com/search?q=8.6+dm+meters&ie=utf-8&oe=utf-8
*August 25, 2016*

**Algebra check answers**

Choose the best definition for the following term: variable A. A letter that holds the place for some unknown value in mathematics*** Yes Question 2 Choose the best definition for the following term: substitution C. A process where if two things are equal, one can be put in ...
*August 25, 2016*

**World history.**

I vote for c. but miss e. it had tax collectors and slave drivers
*August 25, 2016*

**physics**

potential energy at top = kinetic energy at bottom m g h = (1/2)m v^2 so h = v^2/(2g) = 225/(2*9.81) about 11 meters
*August 25, 2016*

**Algebra**

yes, the second number has to be -1 :)
*August 25, 2016*

**Physics**

m = spaceship mass = 3.3*10^5 M = asteroid mass = 8.7*10^17 R = 7,300,000 m = 7.3*10^6 meters F = m a = m v^2/R F = G m M/R^2 + k |Q1| |Q2|/R^2 (both forces +, attraction) so v^2 = G M/R + k |Q1| |Q2|/(m R)
*August 25, 2016*

**math**

yes, distributive properrty
*August 25, 2016*

**MATH**

(11+x)/(15+x) = 7/8 88 + 8 x = 105 + 7 x x = 17
*August 25, 2016*

**?**

How did you go from 134.05 hp to 13.05 hp ?
*August 25, 2016*

**ALG 2**

It said the length was twice, not half.
*August 25, 2016*

**ALG 2**

4*9 = 36 so garden length is 9 so n = 4.5
*August 25, 2016*

**Math**

∫cos^6 x dx note: ∫cos^n dx=[cos^(n-1)x /n sin x]+(n-1)/n ∫cos^(n-2)x dx and ∫cos^2 x dx = x/2 + sin 2x /4
*August 25, 2016*

**SOUND**

compression wave in material
*August 25, 2016*

**Maths**

draw triangle center to bisect chord. draw altitude from circle center of to chord center. right triangle legs 5 and 4, hypotenuse is radius sqrt (25 + 16) = sqrt(41)
*August 25, 2016*

**math**

30*6.50 = 195 300 - 195 = 105 needed in tips 105 = .20 * x x = 525
*August 24, 2016*

**Math**

j = b - 2 b = .5 m so j = .5 m - 2 m = 2 b b = j + 2 etc etc etc
*August 24, 2016*

**PHYSICS**

huh? circumference = 2 pi R
*August 24, 2016*

**Math**

You are welcome.
*August 24, 2016*

**Math**

3^3 = 27 (x^4)^3 = x^12 so 27 x^12 y^3
*August 24, 2016*

**math**

n-1 , n , n+1 n+1 = .5 (n-1) + 2 I guess, English not clear n+1 = .5 n - .5 + 2 .5 n = .5 n = 1 so 0 , 1 , 2
*August 24, 2016*

**math**

If you subtract nothing from twenty you still have twenty.
*August 24, 2016*

**physics vectors**

x direction: 6 a - 8 b + 25 = 0 y direction: -8 a + 3 b + 22 = 0 ========================== 24 a - 32 b + 100 = 0 -24 a + 9 b + 66 = 0 -------------------------add - 23 b + 166 = 0 b = 7.22 a = 5.46 check my arithmetic !
*August 24, 2016*

**MATH**

LOL, yes :) good
*August 24, 2016*

**MATH**

http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html Xn = a +(n-1)d 96 = a + 13 d 173 = a + 24 d --------------- -77 = -11 d d = 7 then a = 96 - 13*7 = 5 so X19 = 5 + 18*7 = 131 etc
*August 24, 2016*

**pre calculus honors**

try a. 10+2+3 = 15 yes 70+2+3 = 75 yes 30+2-3 = 29 yes so a works, the end :)
*August 24, 2016*

**MATH**

well, a = 6, given and d = 7 given Xn = 6 + (n-1)7 X6 = 6 + 5*7 = 41 X15 = 6 + 14*7
*August 24, 2016*

**MATH**

Now you did the one above, you can do this one.
*August 24, 2016*

**pre calculus honors**

but I cheated. [ used a = dV/dt = d/dt (dx/dt) ]
*August 24, 2016*

**pre calculus honors**

which is the acceleration of gravity on earth in ft/s^2 and indeed it works ;)
*August 24, 2016*

**pre calculus honors**

I wonder if a comes out -32 ft/second^2 :)
*August 24, 2016*

**typo I think not 12 but 1/2**

You mean s = (1/2) at^2 + v (small o) t + s (small o) so 161 = .5 a + Vo + So 98 = .5 a(4) + 2 Vo + So 3 = .5 a(9) + 3 Vo + So or 1 a + 2 Vo + 2 So = 322 2 a + 2 Vo + 1 So = 98 4.5a+ 3 Vo + 1 So = 3 solve three linear equations for a, Vo So
*August 24, 2016*

**math**

upwind speed = u -w downwind speed = u+w 1650 = (u-w)(3.3 hours) 1650 = (u+w)(3) 3 u + 3 w = 1650 3.3 u - 3.3 w = 1650 3.3 u + 3.3 w = 1.1*1650 = 1815 3.3 u - 3.3 w = 1650 -------------------- add 6.6 u = 3465 u = 525 miles/hour now find w
*August 24, 2016*

**Physics**

let g = 9.8 m/s^2 weight = 2500 * 9.8 = 24,500 N Thrust - weight - drag = m a 29,000 - 24,500 - drag = 2500 (1.7) drag = 250 N at this speed and thrust Now I do not know what your class has done about drag of a sphere. However what is needed is the speed at which the drag of ...
*August 24, 2016*

**Math**

f = 3 s + 4 f = 40 so 40 = 3 s + 4
*August 24, 2016*

**algebra**

I am doing the second part first :) x^a * x^b = x^(a+b) and x^-a = 1/x^a therefore x^7 * x^-2 = x^7/x^2 = x^5 or x^7 * x^-2 = x^(7-2) = x^5 remarkable :) x^7 / x^2 = x^7 * x^-2 which we already did :)
*August 23, 2016*

**math**

405 / 15 = x/1 15 x = 405 x = 405/15
*August 23, 2016*

**Physical science check my answers**

A is correct, and I assumed you meant A and just forgot to hit Enter.
*August 23, 2016*

**Physical science check my answers**

I agree with them all.
*August 23, 2016*

**Physical science check my answers**

Yes they are.
*August 23, 2016*

**Physical science check my answers**

try # 4. again, Vx = dx/dt x = Xi + Vx t
*August 23, 2016*

**biology**

1. but ice floats. You can skate on it. 2. The water heats up slowly so the fish makes it to dusk when the sun goes down. 3. Yes, correct 4. Yes, correct
*August 23, 2016*

**math ASAP**

27/21 = 9/7 * 3/3 the others do not work
*August 23, 2016*

**math**

3*24
*August 23, 2016*

**world geography**

1. disagree 2. agree 3. agree 4. Irish is a folk and the parade is part of their culture :) I am not at all sure fast food is a habit of members of any particular religion! When it says "general population" it is not focusing on a particular folk.
*August 23, 2016*

**algebra 1**

yes equation would be c = 0.75 + 0.25 t
*August 22, 2016*

**math**

sin x/ cos x = tan x 3 - 4 tan^2 x = 3 - tan^2 x tan x = 0 x = 0, pi etc
*August 22, 2016*

**Medical dosages - no idea**

I do not know what your acronyms mean.
*August 22, 2016*

**algebra 1**

You are welcome.
*August 22, 2016*

**algebra 1**

http://www.mathsisfun.com/definitions/quotient.html
*August 22, 2016*

**algebra 1**

Yes, when you see the word quotient you are talking about division.
*August 22, 2016*

**algebra**

v = 2.8 - 9.8 t v = 0 at top so t = .286 seconds rising at top h = 12 + 2.8 (.286) - 4.9 (.286)^2 = 12.4 meters how long to fall from 12.4 ? 0 = 12.4 - 4.9 t^2 t = 1.59 seconds to fall from up there so total time = .286+1.59 = 1.88 seconds
*August 22, 2016*

**Math**

x-1 = 1/x x^2 - x = 1 x^2 - x - 1 = 0 x = [ 1 +/- sqrt (1+4) ]/2 x = .5 +/- .5 sqrt 5 since it has to be positive x = .5 + .5 sqrt 5
*August 21, 2016*

**Math 2**

see above
*August 21, 2016*

**physics**

total time = 95/1.26 + 95/3.61 total distance = 95+95 average speed = total distance/total time
*August 21, 2016*

**Calculus**

V = x (30-2x)(20-2x) multiply that out Of course part 2 will be to take the derivative and set it to zero to find the height for maximum volume.
*August 21, 2016*

**physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one**

back in his hands. It has the same horizontal velocity as the train has (ignoring air drag of course) Of course if the train speeds up while the ball is in the air, that changes it, but you can figure that out.
*August 21, 2016*

**physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one**

Hey, why ask us? You know. In a vacuum, there is no difference, mass does not enter the equations. However if you include air drag, it is like you have a parachute attached. The lead ball will go further.
*August 21, 2016*

**LOL**

Do not see graph.
*August 21, 2016*

**physics .Henry,Damon,Steve,Saed,bobpursley, And This is my question every one**

a) do r(5) b) dx/dt = u = -12.3 + 4.86 t dy/dt = v = 3.6 t - .39 t^2 c) find sqrt (u^2+v^2) at t = 5
*August 21, 2016*

**PHYSICS ASAP REPLY**

A hydrogen filled balloon is lighter than air and rises. It can also burn very rapidly (Google Hindenburg) and it is safer to use helium even though it is not as buoyant.
*August 20, 2016*

**PHYSICS topic is pressure**

If you stay there long enough to decrease the oxygen and increase the CO2 and there is no input of fresh air that could happen.
*August 20, 2016*

**PHYSICS topic is pressure**

I do not have a lot of trouble breathing with SCUBA gear under 100 feet of water. The pressure there is far greater than that in any deep well full of air that I can imagine. Perhaps this well is full of water? I suppose the increased pressure by increased density of gas makes...
*August 20, 2016*

**typo error**

average speed crossing window = 20 m/s now look at increase of speed in 2 meter drop v = Vi + 9.8 (.1) call g = 10 for simplicity v = Vi + 1 but we know (v+Vi)/2 = 20 the average v = Vi + 1 v = -Vi + 40 -------------- 0 = 2 Vi -39 Vi = about 20 at top of window so how long did...
*August 20, 2016*

**Physics**

average speed crossing window = 20 m/s now look at increase of speed in 2 meter drop v = Vi + 9.8 (2) call g = 10 for simplicity v = Vi + 20 but we know (v+Vi)/2 = 20 the average v = Vi + 20 v = -Vi + 40 0 = 2 Vi -20 Vi = 10 at top of window so how long did it fall to the top ...
*August 20, 2016*

**Maths Unitary Method**

4*12 = 48 48 ban/104 RS (48 ban/104 RS)* 6.5 RS
*August 20, 2016*

**Maths Unitary Method**

(48 boxes/6000 pens) * 1875 boxes
*August 20, 2016*

**Maths Unitary Method**

(28/550)*700
*August 20, 2016*