Tuesday
August 30, 2016

Posts by Damon

Total # Posts: 26,839

Physics
17 min = 1020 seconds coulomb = amps * seconds so coulombs = .526 etc * 1020 or about 536 coulombs so answer = (536 / 1.602) 10^19
January 13, 2016

chemistry
(1/2)^ 6 = 1/64 so we are talking six half lives for A is 12 hours so one half life for A is 2 hours Now I will read the problem :) well half life of B is 3 hours 1/32 = 5 half lives 5 * 3 = 15 hours Not hard, just keep your wits about you and think ! (and check my arithmetic :)
January 13, 2016

physics
define + is up Draw a picture x = 0 at A , Fa up x = 80 at C , Fc up x = 50 at CG, mg =4*9.81=39.24 down so Fcg = -39.24 N sum of forces = 0 Fa + Fc + Fcg = 0 so Fa+Fc = 39.24 N now do moments about 0 for example Fc * 80 = 39.24 * 50 Fc = 24.5 N so Fa = 39.24 - 24.5 = 14.7 N
January 13, 2016

chemistry
Oh my. How many electrons? Nickel is 58.7 grams per mole or 6*10^23 atoms which here is 6*10^23 electros so 6 g * 6.022*10^23 electrons/58.7 g = .6155 * 10^23 electrons 1.602*10^-19 coulomb/electron so the product is .986 * 10^4 Coulombs a coulomb is an amp second so .986*10^4...
January 13, 2016

physics
.3 * 55 * 9.81
January 13, 2016

Algebra
3 x + 2 y = 13.5 2 x + 1 y = 8 =================== 3 x + 2 y = 13.5 4 x + 2 y = 16 -----------------subtract - x = - 2.5 x = 2.50 for hot dog (A yes) then 5 + y = 8 y = 3.00 for soda (B no ) C yes, that is what I did D makes no sense at all
January 13, 2016

Math Help!
1 A yes 2.yes 6/11 = 84/x 6 x = 11 * 84 x = 11*14 = 154
January 13, 2016

Math Help!
well I will do the last one 22/55 = 12/h multiply both sides by the LCD which is 55 h then (22/55) (55 h ) = (12/h)(55 h) or 22 h = 12 * 55 divide both sides by 11 2 h = 12 * 5 divide both sides by 2 h = 6 * 5 h = 30 ------------------- I have gone step by step to show you why...
January 13, 2016

Algebra 1
.793 is not very good, like at least above .8 but it is not bad and it might show that you are on the right track.
January 13, 2016

algebra
(1 branch/2 inches )72 inches = 36 branches
January 13, 2016

physics
d = (1/2) a t^2 100 = (1/2) a (100) so a = 2 m/s^2 F = m a = 32.5*2 = 65 N
January 13, 2016

Huh?
You bought one apple and sold ten? suspect you bought each at 10 and sold each at 11 1/10 = 0.1 0.1 * 100 = 10%
January 13, 2016

Physics
dv/dt = -6 t^3 v = -(6/4)t^4 + 5 when it stops, v = 0 t^4 = 3.333 seconds to stop t = 1.351 and t^5 = 4.504 x = -(6/20) t^5 + 5 t x = -(6/20)(4.504) + 6.755 = -1.3512 + 6.755 = 5.4 meters
January 13, 2016

Chemistry
heat to warm copper= Ccopper * 50 *(39.3-10) heat to cool water= 4.18 * 200 * (40-39.3) set them equal and solve for Ccopper
January 13, 2016

Physics
radius = Rearth cos 41.9 omega =2 pi/(24 hrs * 1 hr/3600 s) v = r omega
January 13, 2016

Math
9. percent equivalent to 3 is... Is it 0.03%? No 3 * 100 = 300 percent
January 13, 2016

Math NO !
Oh, is 4 1/4 as a percent - 4.25%? 4.25 * 100 = 425 % More than 4 times is more than 400 percent more: 4. fraction equivalent to 0.75% is... Is it 3/4? NO!!! .75/100 = .0075
January 13, 2016

math
for the same numerator the bigger the bottom, the smaller the result surely 1/4 is less than 1/2 :)
January 12, 2016

Physics
think lifting a barbell work in = Force up * distance up That is also the increase on potential energy m g h when you drop it that same value in Joules becomes (1/2) m v^2
January 12, 2016

Physics
Conservation of energy work done = increase of energy or work done = increase in kinetic energy + increase on potential energy
January 12, 2016

Math
photo area = 88 in^2 outside dimension = 8+2x by 11+2x so we want (2x+8)(2x+11) - 88 = 42 4 x^2 + 38 x - 42 = 0 2 x^2 + 19 x - 21 = 0 (2x + 21)(x-1) = 0 x = 1 inch
January 12, 2016

Math
LOL check your physics question
January 12, 2016

Math
silver back got 1 and 2 however 3 when you multiply by negative, you reverse the arrow 3. -5 p > - 30 5 p < 30 p < 6 which is b
January 12, 2016

Physics
F cos 38 = m a easy way is for constant acceleration v average = (Vi+Vf)/2 so v average = (0 + 2.2)/2 = 1.1 m/s so time = t = 3.4/1.1 = 3.09 s a = change in v / time = 2.2 / 3.09 = .712 m/s^2 so F cos 38 = 12 * .712 F = 10.8 Newtons
January 12, 2016

Math
3 (3 + 7/8) = 9 + 21/8 =11 5/8 15 4/8 - 11 5/8 = 14 12/8 - 11 5/8 = 3 7/8 He could get one more if it were not for the saw cerfs :) ------------------ check note 3 7/8 = 4 - 1/8 4 (4-1/8) = 16 - 4/8 = 15 1/2 sure enough
January 12, 2016

Math
1.12 = 8 x x = .14 or 14 % extra
January 12, 2016

Math
yes
January 12, 2016

math
2 v + 3 (v-10) = 220 5 v - 30 = 220 5 v = 250 v = 50
January 12, 2016

Math (Calculus - Limits)
(x-8)(x+b) = x^2 + 2 x + c - 8 b = c and -8 x + b x = 2 x or b = 10 so c = -80
January 12, 2016

Math
I mean 30 + 12 + 30 + 12
January 12, 2016

Math
so 20 + 12 + 30 + 12 :)
January 12, 2016

Math
1.6 x x + .6 x I guess :)
January 12, 2016

Physics help
loss of potential energy = gain in kinetic energy from 38.7 to 25.6: m g (38.7 - 25.6) = (1/2) m v^2 v = sqrt (2 * 9.81 * 13.1) = 16 m/s 12 = sqrt (2 * 9.81 * distance down) 144 = 19.62 d d = 7.34 distance of fall so 38.7 - 7.34 = 31.3 meters high at 12 m/s v = sqrt (2 *9.81* ...
January 12, 2016

physics
m = F/a = 48/3 = 16 kg
January 12, 2016

physics
both horizontal and down are 10 * sqrt2 /2 Newtons because sin 45 = cos 45 = sqrt2 /2
January 12, 2016

Math
xx 1 2 3 4 5 6 ------------- 1| 1 2 3 4 5 6 2| 2 4 6 8 10 12 3| 3 6 9 12 15 18 4| 4 8 12 16 20 24 5| 5 10 15 20 25 30 6| 6 12 18 24 30 36 well Leah's number must happen 3 times for every 2 of Sam's for example 2 happens twice (Sam) 4 happens 3 times (Leah) is there a ...
January 12, 2016

math
radius pond = 13 yds radius outside walk = 13+2 = 15 yds area of walk = pi (15^2-13^2) Got it now ?
January 12, 2016

math help please
5 (36-15)
January 12, 2016

Algebra
m + (m-15) = 44 ?? 2 m = 59 m = 29.5 s = m-15 = 14.5
January 12, 2016

math help please
20 + 5 + 20 + 5
January 12, 2016

physics
LOL - I guess unless the string breaks they better have the same acceleration force of m1 down slope = 3.7 g sin 30 = 1.85 g force of m2 the other way = 2.3 g net force = (2.3 -1.85)g = .45 * 9.81 = 4.41 N block 2 wins and heads straight down, block 1 heads up slope a = 4.41...
January 12, 2016

Algebra II
well, I suppose I would check -125^4/3 -125^1/3 = -5 then(-5)^4 = 625 so it looks like you are right to me
January 12, 2016

Calculus AB
Ah, so you have heard the words "mean value theorem" now let's see what the slope is from x = 1 to x = 2 y(2) = |(-2)(6)| = 12 y(1) = |(-5)(3)| = 15 so slope = -3/1 = -3 Mean value theorem says slope must be 3 at least once between = 1 and x = 2 lets look at ...
January 12, 2016

Calculus AB
Here you go http://www.sosmath.com/calculus/diff/der11/der11.html (mean value theorem)
January 12, 2016

Calculus AB
DRAW A GRAPH !!! somehow a smooth curve has to get from 4 at -3 back to 4 at +4 It could be a horizontal line, but that is a trivial case It could start up, but then would have to come down. SO HAS TO HAVE SLOPE of ZERO in here at least once if it started down, it has to come ...
January 12, 2016

us history. Plz help!
Well where is Louisiana and the Mississippi valley on your map ?
January 12, 2016

us history. Plz help!
3 is wrong. The United States did not exist when France was fighting England and us in the north east. I suspect they mean Louisiana purchase 5 wrong remember slavery etc at the time period 7 - I do not remember, assume you are right 9 I guess 11 no 12 - need for strong ...
January 12, 2016

math help
45 min + 30 min = 75 min = 1 hour and 15 min = 1.25 hr 9 - 1.25 = 7.75 which is 7:45 am
January 12, 2016

Math
2.5 gal (4 qt/gal) = 10 qt
January 12, 2016

math help
70/2
January 12, 2016

math
3 * 5.5 = 16.5 = 17
January 12, 2016

math
if n is 12 then n+6 is 18
January 12, 2016

Conversion
if it is 10 seconds I suspect 110 yards :) 1760 yd/mi 3600 s/h 110 yd/10 s (1 mi/1760 yd)(3600s/h) = 22.3 mi/h
January 12, 2016

PHYSICS 1
if your angles are math convention, counterclockwise from x axis and not compass angles from north then just use what Steve gave you for A Ax = 145 cos 190 Ay = 145 sin 190 etc
January 12, 2016

math
4.5 / 60
January 12, 2016

6 is right
You got one, enough already
January 12, 2016

Random selections?
4 C Hey have you just picked random answers?
January 12, 2016

Math
3D wrong, solution is y = 0 but what about 0 x = 0 in 2C ?
January 12, 2016

Math
2. Same mistake 5 x = + 40
January 12, 2016

Math
1) no 16 - 9 = +7
January 12, 2016

Please try to do these before asking
We are here to help, not to do your work for you. Try first
January 12, 2016

math
I just answered this http://www.jiskha.com/display.cgi?id=1452632926
January 12, 2016

Math
2 L + 2 w = 30 L = 4 w ======================== 2(4 w) + 2 w = 30 10 w = 30 w = 3 so L = 12 and A = 3 * 12 cm^2
January 12, 2016

Language Arts - Please Help!
1. I would pick B. It follows line by line the poem. 6. It says rhythym, not rhyme 7. I have no idea. 9. the second half can stand independently.
January 12, 2016

Grade 5 math
16 * 75 = ??? cm divide cm by 100 to get meters
January 12, 2016

msth
10 x + y x = 3+5 = 8 8 = 2 y so y = 4 80 + 4 = 84
January 12, 2016

Math
yes, you are welcome.
January 12, 2016

Math
2.6 + 6.03 + 2.6
January 12, 2016

Algebra
I do not see your answers.
January 12, 2016

maths
LOL you need more than that side side side? side angle side? angle side angle? or something
January 12, 2016

Math
1. yes 2. yes 3. no 9-12 = ? 4. five less is x-5 it can be equal to 9 or x-5 = 9 or it can be greater than 9 or x-5>9 so x - 5 >/= 9 which I believe is A
January 12, 2016

Algebra
y = (-3/4) x + 2 y = (+3/4) x + 2 slopes are -3/4 and +3/4 if they were the same, then parallel if one were - 1/the other, then perpendicular so neither
January 12, 2016

math
45 x = 100 + 25 x
January 12, 2016

SS HELP!
yes
January 12, 2016

SS HELP!
Which answer uses the word "Rights".
January 12, 2016

SS HELP!
1. No 2. yes 3. yes 4. I am not familiar with Georgia constitution but wonder if the conduct negotiations with Germany
January 12, 2016

History
neither
January 12, 2016

History
The assumption that "Most people know ... " is a hint of bias of course.
January 12, 2016

History
No, but we do not see what is in the article you read.
January 12, 2016

Math
yes
January 12, 2016

Social studies
Look at a globe or map !!!!!
January 12, 2016

Social studies
I would not pick d. That covers all of Europe and Africa :)
January 12, 2016

Social studies
For example: Israel, Jordan, and Lebanon. Saudi Arabia, Iraq,Iran Egypt, Turkey. ============================= find them :) by the way I am sure that they are all south of the arctic and north of the south pole, but that does not locate them satisfactorily.
January 12, 2016

Math
13891885.31 approximately
January 12, 2016

Math
220/8 = 27.5 225/5 = 45 do the others the same way and see which is the most words/minute
January 12, 2016

Math
Which ratio is equivalent to 4/16 A. 2:4•• B. 6 to 20 C. 8:32 D. 12 to 64 ===================== no 2/4 = 1/2 4/16 = 1/4 the only one with a denominator four times the numerator is 8/32 C.
January 12, 2016

I am not sure
I guess I would start with a Google search, maybe on napkin dye safety or just paper dye safety or something. I am not sure they are any more dangerous though.
January 12, 2016

Wait a minute
What am I thinking? The RANGE is the amount in the account. The DOMAIN is the date :)
January 12, 2016

Algebra 2
However it would not include 51.473 so 100 * entry is integer
January 12, 2016

Algebra 2
Why would it be integers? $ 51.47 for example I suppose it could be negative if your bank has some sort of policy covering your bad checks.
January 12, 2016

math
2 x^2 = 100^2 ? x^2 = 5,000 x = 70.7 feet if you want the sides of a square with 100 ft diagonal
January 12, 2016

I do not understand
Is this the diagonals of a square or something and you want the sides?
January 12, 2016

Math
(3/7)(3/3) = 9/21 sure enough :)
January 12, 2016

Math
Cute problem :)
January 12, 2016

Math
log 2 (-3sin x) -log2 (cos^2) x =1 log 2 [ -3 sin x/cos^2 x = 1 -3 sin x / cos^2 x = 2^1 = 2 sin x/cos^2 x = -2/3 well the sin must be negative so x is between pi and 2 pi well try sin x/(1 - sin^2 x ) = -2/3 let z = sin x z/(1-z^2) = -2/3 3 z = -2 + 2 z^2 2 z^2 - 3 z - 2 = 0...
January 12, 2016

Math
5h - 9 = -16 + 6h subtract 5 h from both sides - 9 = - 16 + 1 h add 16 to both sides 7 = h the end
January 12, 2016

Social studies
LOL - I would have picked A. Jews, Christians of all sorts in Syria and Lebanon and Armenia (if any survive) and Egypt .... But probably C is the expected answer.
January 12, 2016

of
1 12/60 hours = 1.2 hours 50 km/h * 1.2 h = 60 km
January 12, 2016

math
so A total = 32 x^2 sqrt 3/.75 so 32 x^2 sqrt 3/.75 = 19200 sqrt 3 x^2 = 450 x = 21.2 check my arithmetic
January 12, 2016

math
If you draw it you can see that An = An-1 * .25 or a , .25 a , .25^2 a etc we have a sum of a geometric series here with r = .25 see http://www.mathsisfun.com/algebra/sequences-sums-geometric.html the first term a is area of triangle with 8 x sides a = 2 * 4x * 4x sqrt 3 = 32 ...
January 12, 2016

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