Monday
August 29, 2016

Posts by Damon

Total # Posts: 26,839

Math
u = 1 - y^2 du = -2 y dy or dy = du/-2y ((y^3)/(u^2))[du/-2y] (-1/2)y^2 du/u^2 but y^2 = 1-u so -(1/2)(1-u) du/u^2 = (u/2)du/u^2 - (1/2)du/u^2 = (1/2) du/u - .5 u^-2 du finish and check my arithmetic :)
July 24, 2016

Someone Please Help me- PreCalc
x^2 + y^2 = 1 16/49 + y^2 = 49/49 y^2 = 33/49 y = +/- sqrt (33) /7 so since in Q IV where y is negative (4/7, -sqrt(33)/7 )
July 24, 2016

physics
10 * 100
July 24, 2016

physics
potential energy at top = kinetic energy at bottom m g h = (1/2) m v^2
July 24, 2016

maths
24 + 5 - 17
July 24, 2016

Physics
Oh, do cos wt = -1/2 as well
July 24, 2016

Physics
x = X sin w t v = X w cos w t so X w cos w t = (1/2) X w cos w t = 1/2 w t = 60 degrees, 300 degrees etc or in radians pi/3 etc so what is x/X when wt = pi/3 etc x/X = sin wt x/X = sin 60, 300 etc x/X = .866 , -.866 etc
July 24, 2016

Math
x + 24 = 36 ?? -24 = -24 ---------------add x + 0 = 12 so x = 12
July 23, 2016

Math
.3(10) = 3 .3(10+10) = 3+3 = 6 .3(10+10+10) = 3+3+3= 9
July 23, 2016

physic
kinetic energy = (1/2) m v^2 that goes into heating the brakes (use Joules not calories) energy =specific heat*mass*(Tend-Tbegin)
July 23, 2016

Science
(1/2) m v^2 = (1/2)(1/2)(9) = 9/4 Joules
July 22, 2016

math
first blue: 6/16 second blue 5/15 so 3/8 * 1/3 = 1/8 = 0.125
July 22, 2016

math whoops 4/13
sorry, 4/13
July 22, 2016

math
careful !
July 22, 2016

math 11/36
http://davidmlane.com/hyperstat/A136602.html
July 22, 2016

math
Yes,note unlike the other two questions because red and spade are mutually exclusive
July 22, 2016

physicis
metal A length x metal B length (15-x) x(4.3)(pi r^2) + (15-x)(6.3)(pi r^2) = 21757 4.3 x + 94.3 - 6.3 x = 21757/(81 pi) 2 x = 8.8 x = 4.4 cm
July 22, 2016

Physics
m = 670/g = 670/9.81 = 68.3 kg F = G m Ms/(r^2) F=6.67*10^-11*68.3*1.99*10^30/7500^2
July 22, 2016

stats
http://davidmlane.com/hyperstat/z_table.html
July 22, 2016

PHYSICS
well, I am just going to estimate iron density about 8 times water 8000 kg/m^3 or 8 g/cm^3 8 L pi r^2 = 8(85)(3)(2.5)^2 about 8 * 85 *3 * 6.3 or 12852 grams 12.8 kg no problem :) less than 30 pounds
July 22, 2016

maths
n cupcskes n/6 to neighbor , 5n/6 remain (7/10)(5n/6) to sister or 7n/12 to sister (3/10)(5n/6) remain or n/4 remain so n/4 =12 n =48
July 22, 2016

Physics
How high does it go? v = Vi -9.81 t at top v = 0 0 = 14 -9.81 t so t = 14/9.81 then h = 100 + 14 t - 4.9 t^2 now fall from h v^2 = 2 g h
July 22, 2016

Algebra
x and (60-x) 2 x -.5(60-x) = 10 2 x -30 +.5 x = 10 2.5 x = 40 25 x =400 x = 16 60-x = 44
July 22, 2016

Algebra
(y-a)^2 = y^2 - 7 y + p y^2 - 2 a + a^2 = y^2 - 7 y + p 2 a = 7 a = 7/2 so p = a^2 = 49/4
July 22, 2016

Physics,Mthe
mass/volume = density =100/10 = 10 but you have given no units so it could be anything at all.
July 22, 2016

math
96
July 21, 2016

math
64
July 21, 2016

math
32
July 21, 2016

Physics
I am not going to just give you the answers to these very basic questions. Try yourself and maybe someone will help if you get messed up.
July 21, 2016

No way !
No, I refuse to just answer. You say and tell us why. What do you think? What is the difference between mass and weight? Would it be different at different locations in the body?
July 21, 2016

American History
Budgets cuts in our Defense has led to inefficient weapons available to the soldiers to fight wars here in America or Overseas. ??????????????????? Please compare US defense budgets and resulting weaponry to those of other countries.
July 21, 2016

Math
For what value(s) of r is r^2+5r+6/r+2 equal to 0? A) -2 only B) -3 only C) 3 only D)-2 or -3 E) 2 or 3 I got A but it is incorrect and I'm still confused Thanks
July 20, 2016

Chemistry
How many grams of hydrogen peroxide (H2O2) must be added to 1,500 ml of water to produce a concentration of 1.33 m (molal solution)?
July 20, 2016

Math
checks at http://www.mortgagecalculator.org/
July 20, 2016

Math
payment = principal [ r/ (1 - {1+r}^-n) ] here principal = 200,000 r = .10/12 = .0083333333..... n = 25*12 = 300 = 200,000 [ .00833... / (1-{1.00833..}^-300) ] = 200,000 [ .009087 ] = 1817.40
July 20, 2016

math
7 * 9 = 63 315/63 = 5 so 7 * 9 * 5 = 315
July 20, 2016

Geometry
y = 2 x - 5 to y = 2 x moves up 5
July 20, 2016

Math
have played x have won .75 x will have won .75 x + 4 will have played x + 4 so .75 x + 4 = .80 (x +4) 4 - .8*4 = .05 x 4 - 3.2 = .05 x .8 = .05 x 800 = 5 x x = 160
July 20, 2016

Algebra
c^2 + 18 c - 175 = 0 (c + 25)(c - 7) = 0 c = 7 or c = -25
July 20, 2016

statistics
15951/13 = 1227 per yesr
July 20, 2016

Math
7 1/2 = 15/2 15/2 / 3/4 = 30/3 = 10 =============== or 10 * 3/4 = 30/4 = 7 1/2
July 20, 2016

algebra
Well, if the denominator is constant and x is alone up there (no x^2 or sin x or anything) then yes
July 19, 2016

Northwest is not 30 deg n of e
when you get the geometry figured out look at: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/forwir2.html
July 19, 2016

Nobody knows
we do not know what the dimensions were on the plans, or alternately the area. If you know the area on the plan, A in^2 then Areal = A (9 ft^2/6.25 in^2)
July 19, 2016

physics
Well, you could use Maxwell's equations, but it might be easier to make a common sense guess. If moving the magnet makes a voltage, then it is likely that moving it faster will make a bigger voltage.
July 19, 2016

Physics
ps: That is what potential is all about.
July 19, 2016

Physics
exactly as much as to slide down one mountain and up the one beside it to the same height, with no friction of course.
July 19, 2016

Math
71/163 = F/756 so F = 756 * 71 / 163
July 17, 2016

Maths
21 - 13 = 8 play only C 16 - 13 = 3 play only F 8+3+13 = 24
July 17, 2016

University of jos,physics
ROFL zero, went nowhere Now average speed is another matter.
July 17, 2016

Math
I think it is just folded three times so the short edges can be welded together. No top and bottom yet
July 17, 2016

Math
height = 20 side length = 36/4 = 9 volume = 9*9*20 cm^3 top = 81 cm^2 bottom = 81 cm^2 81 * 2 = 162 cm^2
July 17, 2016

University of jos,physics
distance = sqrt (3^2 + 4^2) = 5 sin angle north of east = 3/5 = 0.6
July 17, 2016

University of jos,physics
h = (1/2) g t^2 if g = 9.81 h = 4.9 (25)
July 17, 2016

Physics
The link tells you right off. 2.25*10^8 instead of 3*10^8
July 17, 2016

Physics
http://www.google.com/search?q=velocity+of+light+in+water&ie=utf-8&oe=utf-8
July 17, 2016

Physics
What are you using for c? The velocity of light in water is lower than in a vacuum, which you know I am sure from your experience trying to shoot fish with a bow and arrow. If you are using about 3*10^8 m/s, that is wrong.
July 17, 2016

typo ?
"perimeter 10 meters " I guess maybe you mean ten times but it is still nonsense 1000 = 25 L so L = 40 m 1000 = 10 ( L+w) 100 = 40 + w so w = 60 area = L * w obviously there is something wrong. width bigger than length
July 17, 2016

math
5 maybe ?
July 17, 2016

pre cal
well g = x^2 + anything will work. Steve used zero
July 17, 2016

pre cal
where are the zeros of this parabola? x^2 + 6 x + 18 = 0 x = [-6 +/- sqrt (36-72)]/2 = -3 +/- 3 vertex is at x = -3 g has it at at x = 0 how high is it? roots are not real so above x axis y = (-3)^2 -18 +18 = 9 so to be even g(x) = x^2 + k when x = 0, y must be 9 so g(x) = x^2...
July 17, 2016

math
7!/[ 3! * 4! ] 7 * 6 * 5 / 3*2 35 all right
July 17, 2016

Math
total approach speed = 127 km/h 635 / 127 = 5 hours
July 17, 2016

Chemistry
choices A. H>0, S>0 , G<0 B. H<0, S>0 , G<0 C. H>0, S>0 , G>0 D. H<0, S<0 , G>0
July 16, 2016

Chemistry
Marcela dissolves 80.0 g of ammonium nitrate in 50.0 mL of water at room temperature and notes that the temperature of the solution decreases by 5.0°C. Which correctly designates the signs of changes of G, S and H for this reaction?
July 16, 2016

Missing data for binomial distribution problem
We need to know how many she planted. Given n, use binomial distribution with p = 0.95 and 1-p = 0.05
July 16, 2016

math
http://www.jiskha.com/display.cgi?id=1468692682
July 16, 2016

math
red each is 3/20 green each is 4/40 which is 1/10 so 10(3/20) + 50(1/10) = 1.50 + 5.00 = 6.50 ah well, not on the list. Typo?
July 16, 2016

math
let me see 5 7 11 13 I think mean = (5+7+11+13)/2 = 36/4 = 9 median = (7+11)/2 = 9 When there are an even number of items it is impossible to pick the same number above and below any particular one. Therefore you take the average of the two middle ones.
July 16, 2016

physics
original is r v = 5 r then later same v = 4 (r+2) so 5 r = 4 r + 8 r = 8 ohms
July 16, 2016

no, physics :)
9 because 3^2 = 9 or because 3 s has 1 3 p has 3 3 d has 5 and 1 + 3 + 5 = 9 Note, each of those orbits can have electrons with spins of + or - 1/2 so total of 18 electrons for n = 3
July 16, 2016

statistic
3 b 2 b, 1 g 1 b, 2 g 3 g so 4 possible outcomes, all equally likely p of each is .25
July 15, 2016

Geometry
6.75 in (1 ft/.25 in) = 27 ft 4.50 in (1 ft/.25 in) = ?????
July 15, 2016

calc
Angle to what? Not knowing do not know sin or cos F (cos 48 or sin 48)(0.45) = 175
July 15, 2016

Physics
Ah yes, just noticed you said 5, good
July 15, 2016

Physics
C =q/V so x = q/68 that q is all the charge we have now for both capacitors total C = 12*10^-6 + x q = 20 (12*10^-6 + x) 68 x = = 240*10^-6 + 20 x 48 x = 240 * 10^-6 x = 5 *10^-6 Farads or 5 µF
July 15, 2016

You are right, impossible
Force is change of momentum / time = change in m v / t You have to know the time
July 15, 2016

Physics
horizontal speed u = 30 forever so what is vertical speed v? v = g t v = 9.81(3) that is also around 30 m/s so speed = sqrt(u2+v^2) = sqrt 1800) = about 42 do it all better with calculator
July 15, 2016

physics
Tricky pulse speed increases as you toward center at every r, acceleration, a, which is like a variable g for us a = omega^2 r This is like the plse on a hanging rope problem see: http://www.usna.edu/Users/physics/mungan/_files/documents/Scholarship/HangingPulse.pdf
July 15, 2016

physics
Suspect speed is 33.3 m/s average speed during stop = 33.3/2 =16.65 time to stop = t = 30/16.65 = 1.80 s d = .5 a t^2 30 = .5 a 1.8^2 so a = 18.5 m/s^2 so F = m a = 1000*18.5 = 18,500 Newtons
July 15, 2016

Math
so 11 girls, so what is the question?
July 15, 2016

hey, I do not need this much practice, already passed subject
now wait a minute, this is too much like the last one. You try for a while. I already know how.
July 14, 2016

physics
Well, now we seem to be back in the dark ages of some king's feet. v1 = 42*5280/3600 ft/s v2 = 58*5280/3600 ft/s assuming constant acceleration we can use average v va = 50*5280/3600 ft/s so t = 660/va a = (v2-v1)/t
July 14, 2016

physics
26.8 m/s = 60 mph You do not say but I assume you mean 60 mph or 26.8 m/s v = a t 26.8 = a (3.2) a = 26.8/3.2 d = (1/2) a t^2 = .5 (a) (3.2)^2
July 14, 2016

Math
I guess you mean log base b of a = c log a = c b^(log a) = a = b^c if a<1 and b >1 then fraction = big number^c hmm it would be helpful if c <0 like fraction = b^c = 5^-2 = 1/25 if a<0 and b >1 then logb (-something) oh my, we are trying to take the log of a ...
July 14, 2016

Math
You are welcome.
July 14, 2016

Math
d = 2 n q = .5 n 5 n + 10 d + 25 q = 30,000 cents 5 n + 20 n + 12.5 n = 30,000 37.5 n = 30,000 n = 800 so q = 400 D
July 14, 2016

MATH
You want the inverse of: y = (1/3)^x ????? hmmm maybe try x = (1/3)^y ln x = y ln(1/3) y = ln x /ln(1/3) = -ln x ln 3 y = - 1.1 ln x approximately
July 14, 2016

Chemistry
You are welcome namesake :)
July 14, 2016

Chemistry
thanks dude !
July 14, 2016

Chemistry
mols N2H4/ mols H2O2 = 1/2 mols N2H4/mols water = 1/4
July 14, 2016

Chemistry
N2H4 + 2H2O2= N2 + 4H2O What are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water
July 14, 2016

pre cal
u dot v = revenue which is sum of number of each times price of each so 1.05 ( u dot v )
July 14, 2016

physics
1 km * 1000 m/km * 1 s/4 m * 1 min/60 s = 250/60 = 25/6 minutes
July 9, 2016

physics
factors: 1609 m/mi 3600 s/h 1000 m/km 24 hr/d ======================= (.9mi/.5h) = 1.8 mi/h =========================== now (1.8mi/h)(1609m/mi)(1h/3600s) = (1.8*1609/3600) m/s ==================== (1.8*1609/3600)m/s (1km/1000m)(3600*24 s/d) = 1.8*1.609*24 km/d
July 9, 2016

physics
70 mi/h *1 h/60 min = (7/6)mi/min (7/6)(mi/min)(24 min) = 7*4 mi = 28 miles
July 9, 2016

Math (money)
c > 17+ 8 or c > 25
July 9, 2016

Math
pi radians = 180 degrees so 47.1 deg (pi rad/180 deg) = 0.822 radians
July 9, 2016

Mathematics
3 pi/9 + pi/9 or pi/3 + pi/9 180/3 + 180/9 60 + 20 80 or simply (4/9)(180) = 80
July 9, 2016

no - supplement
pi not 2 pi 13 pi/13 - 11 pi/13 = 2 pi/13 so d
July 9, 2016

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>