Tuesday
May 31, 2016

Posts by Damon

Total # Posts: 26,294

science
Did it start at zero speed? If so 300 = (1/2) a t^2 = .5 a *225 a = 600/225
April 29, 2016

math
(4/3)x - 4 - (6/5)x + 9 (20/15)x - (18/15) x + 5 (2/15) x + 5
April 29, 2016

physics
The speed is constant. All you need is the vertical component. (30/4) cos 45
April 29, 2016

math
new length = 15+x new width = 12+x so the last one
April 29, 2016

Pre Calculus
L = 13 - 2x w = 11 - 2x V = (13-2x)(11-2x)x V = (143 - 48 x + 4 x^2)x V = 4 x^3 -48 x^2+143 x find where dV/dx = 0 0 = 12 x^2 - 96 x + 143 x = [ 96 +/- sqrt(9216-6864)]/24 x = [96 +/- 48.5 ]/24 x = 1.98 in or x = 6.02 (too big, no width left) so about 2 inches high
April 29, 2016

physics
.388 kg ice melt it and warm it to 45 C .388 [ 333,000 + 45(4186) ] = 202,292 Joules into what was ice = m [2256,000 + 55(4186) ] = 2,486,230 m m = 202,292/2,486,230 = .0814 kg = 81.4 grams
April 29, 2016

Maths
each pipe does one tank/12 hr call that 1 tank/12 hr pipe 1 tank/12hrpipe * 4 pipe * 2 hr = (8/12) tank = 2/3 of a tank
April 29, 2016

Math
835 cm / 15 cm = 55 2/3 55 pieces + 2/3 * 15 = 10 cm left over
April 29, 2016

maths
100 - 30 = 70 .7 * 60 = 42
April 29, 2016

Physics
I assume you made a typo and mean 1.6 * 10^15 Liters 1 liter water = 1 kg a pint is a pound the world around :) m g h = 1.6*10^15 kg * 9.81 m/s^2 * 143 m = 2245 * 10^15 = 2.245 * 10^18 Joules
April 29, 2016

Math
probability that she sees a bird on any old day = 18/30 = 0.6
April 28, 2016

huh?
180 was the answer, .3 * days 420 is days you do NOT hear thunder.
April 28, 2016

college mathematics
yes --- angle side angle
April 28, 2016

college mathematics
yes --- side side side
April 28, 2016

homework
assume you mean x^(8/9) pi y^2 dy from y = 0 to y = 1 pi x^(16/9) dy but dy = (8/9) x^-(1/9) dx so (8/9)pi x^(15/9)dx from 0 to 1 (8pi/9) (9/24)x^(24/9) (8 pi/24) = pi/3
April 28, 2016

Physics
I guess you mean north of east and east of north east = 1000 cos 40 + 500 sin 20 north = 1000 sin 40 + 500 cos 20 east = 937 north = 1113 distance = sqrt(937^2+1113^2) tan angle north of east = 1113/937
April 27, 2016

Math
width = 1.5 1.5 * 3 * 6 = 18+9 = 27 ft^3 which is one cubic yard
April 26, 2016

Science
calibrate it. Mark points on it that are he same temp as the real thermometer shows, say in cold water and hot.
April 26, 2016

Math
7 * 2.5 * h = 175 h = 10
April 26, 2016

math
Can not, sorry, rules.
April 26, 2016

math
Note above that she answered a question at 6:41 EDT
April 26, 2016

math
Your guess is as good as mine.
April 26, 2016

math
1, 89 , 67 , 89 , 7, 5 , 45 , 7
April 26, 2016

math
What do you mean? They all are except 0.
April 26, 2016

math
I suppose
April 26, 2016

math
Hi neighbor
April 26, 2016

math
1*1*5/(2*2*6) = 5/24
April 26, 2016

Math
I said 280 + 4 w = 420 so 4 w = 140 w = 35 mph wind speed now go back and get v
April 26, 2016

Math
v = 140 + w (140+2w)2 = (140 +w -w )3 = 420 280 + 4 w = 420 etc
April 26, 2016

math
we need something else with y = 16 and with x = 4 so (4,16) DRAW IT !!!!!!!!
April 26, 2016

Calculus
how far apart are they ? t in hours sqrt (x^2 + y^2) =sqrt [(50t)^2 + (60 t)^2] so d = (2500 + 3600)^.5 t d = 78.1 t so separation speed is 78.1 mph all the time
April 26, 2016

math
well they have to add up to one and there are 6 sides p(1) = n prime p(2) = 2n prime p(3) = n prime p(4) = 2n p(5) = n prime p(6) = 2n sum of p s is one 9 n = 1 n = 1/9 primes are 5n or 5/9
April 26, 2016

physics
Angular momentum after = angular momentum before angular momentum before = I w = 1.4*10^-3 * .33 = .462 * 10^-3 angular momentum after = (1.4*10^-3 + 4.2*10^-3) w so w = .462/5.6 = .0835 rad/s
April 26, 2016

History
Actually I think the historical advantage of rivers is that you can float down them easily and if the wind happens to blow up river commonly, you can get up the river easily as well. (the Nile :)
April 26, 2016

History
In fact, more often than not, rivers are more like highways than barriers. Of curse as you know I feel the same way about oceans, but that is because I use them.
April 26, 2016

math
c(27)= 10 * 27 + 26 = 270+26 = 296 so (27 , 296) c(39) = 10*39 + 26 = 390+26 etc
April 26, 2016

math
just use 27 for n and do the arithmetic then do the others.
April 26, 2016

History
Yes, agree with Astral.
April 26, 2016

History
Not on my map. I also have charts of the South China Sea and Straits of Malacca and Indian Ocean that hint at serious ancient interactions. Your text was not written by a seafarer.
April 26, 2016

math
up two in x, down one in y slope = -1/2 so y = -x/2 + b 1 = -2/2 + b b = 2 so y = -x/2 + 2
April 26, 2016

maths
total time = 45 min .75 hour 72 t + 48(.75-t) = 48 etc
April 26, 2016

math
v = Vi - 32 t 0 = 96 - 32 t t = 3 s h = Vi t - 16 t^2 h = 96(3) - 16(3)^2 h = 288 - 144 = 144 ft
April 26, 2016

American history
yes
April 26, 2016

American history
Agree
April 26, 2016

Physics
Of course there is a more basic way to look at this. F = m a = -mg so a = - g = -10 so v = -gt = -10 t so+- initial speed * t - (1/2)(10) t^2 0 = 3 + 0 - 5 t^2 t = sqrt(3/5) so v = -10 sqrt(3/5) = -sqrt(60) = -2 sqrt 15 = -7.75 which we knew
April 26, 2016

Physics
sure, as it drops it picks up speed. The loss in height potential energy, m g h, turns into kinetic energy, (1/2) m v^2 In other words: (1/2) m v^2 = m g h v^2 = 2 g h v = sqrt(2gh) which is something a lot of us remember. Note that the mass does not matter. In a vacuum, a ...
April 26, 2016

Mathematics
neither 8 + 2 n = 32 2 n = 24 n = 12
April 26, 2016

Math
w+2a = 18 h+2a = 11 w h = 60 so w = 60/h (60/h) + 2 a = 18 but a = (11-h)/2 60/h + 11 - h = 18 60 + 11 h - h^2 = 18 h h^2 + 7 h - 60 = 0 check my arithmetic and solve quadratic
April 26, 2016

Mathematics
still 12
April 26, 2016

Economic
google supply and demand
April 25, 2016

Algebra
http://www.jiskha.com/display.cgi?id=1461567386#1461567386.1461580442
April 25, 2016

physics
http://www.jiskha.com/display.cgi?id=1461575534
April 25, 2016

Physcis
How many Joules are needed? power = Vi = 110*7 = 770 watts energy = power*time = 770*600seconds 462,000 JOULES needed = m g h = m (9.81)(10) so m = 4709 Kilograms of water there are 1000 kg of water/meter^2 so 4.709 cubic meters of water
April 25, 2016

Algebra I DONT KNOW HOW TO DO 3 VARIABLES
x = 2 - y - 5z 4(2 - y - 5z) -3y + 5z = 3 3(2 - y - 5z) -2y + 5z = 1 8 - 4y - 20z - 3y + 5z = 3 6 - 3y - 15z - 2y + 5z = 1 -7y - 15z = -5 -5y - 20z = -5 or y = 1 - 4z -7(1-4z) - 15z = -5 7 + 28z -15 z = -5 13 z = 2 SO I get: z = 2/13 y = 13/13 - 8/13 = 5/13 x = 26/13 - 5/13 -...
April 25, 2016

Physics help
Is this the same set of waves? Do you have a box where you store leftover waves? If waves go by you in deep water with high speed and long wavelength for example, they will slow down and become shorter as they approach a shallow beach. However the same number hit the beach per...
April 24, 2016

Math
m = k n/p^2 3 = k (2/1) k = 3/2 m = (3/2) n/p^2
April 24, 2016

Math, algebra 2
arithmetic sequence first term is one so a = 1 d = -1 sum =120 see http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
April 24, 2016

math
5/4 inch * 4 miles/inch = 5 miles (ignoring the change in altitude :)
April 24, 2016

math
4 + 5 + 4 = 13 unless you mean (x+20) / (x+4) which is 24/8 = 3 watch your mathematical grammar.
April 24, 2016

life orientation ?
Is it a violation of my human rights to be asked the same question time after time, day after day, week after week until I am ready to scream?
April 24, 2016

maths
a, ar ar^2 ar^3 ar^4 a r^2 + a r^3 = -4/3 a r^3 + a r^4 = -4/9 a r^2 (1 + r) = -4/3 a r^3 (1 + r) = -4/9 -4/(3 a r^2) = -4/(9 a r^3) so r = 1/3 a(1/9)(4/3) = -4/3 a = -9 so: -9 -3 -1 -1/3 -1/9 and -1/27
April 24, 2016

maths
to get -1 + 0 i z^5 = 1 cos 180 + i sin 180 That should get you started
April 24, 2016

math
9+3 8+4 7+5 6+6 and reverse
April 24, 2016

precalc
θ = 180 + cos^-1 (1/3) = 180 + 70.5 = 250.5 ϕ = 180 - sin^-1 (1/4) = 165.5 so we want tan (416) = 1.48
April 24, 2016

Calculus
I get d^2s/dt^2 = 4 sin 3 t ds/dt = v = -(4/3)cos 3 t + c when t = 0 , v = 1 1 = -4/3 + c c = 7/3 v = -(4/3)cos 3 t + 7/3 s = -(4/9) sin 3 t + 7 t/3 + k 6 = k s = (1/9)(21 t - 4 sin 3 t +54)
April 24, 2016

algebra
1/R = 1/R1 + 1/R2 or R = R1 R2 /(R1+R2) = 8*12/(20) = 4.8 Ohms
April 24, 2016

math
L = k m^(1/3) 15 = k (125)^(1/3) = k (5) k = 3
April 23, 2016

converting parabolic equations
huh? multiply x + 15= 8(y^2 - 2y + 1) 8 y^2 - 16 y + 8 = x +15 x = 8 y^2 - 16 y -7
April 23, 2016

Mathematics
maybe something like let z = ln x dz /dx = 1/x dx = x dz ∫ 1/[x(1+lnx)^2] dx ∫ dz/[ 1+z]^2
April 23, 2016

World History
Even without an invasion or nuclear bombs Japan was all done. Between the American submarine fleet and surface/air fleets, they were being strangled. Japan does not have oil or many other vital supplies. Without merchant ships to and from Southeast Asia and elsewhere, they ...
April 22, 2016

Math
Oval? If it were circular, the fence would be 2 pi R long where R is radius (in feet, three times radius in yards) If it is an ellipse, then a = half length of long axis b = half length of short axis Perimeter = 4 a E(k) where k^2 = 1 - (b/a)^2 and E(k) is an elliptic integral...
April 22, 2016

Complex number cartesian form
Well, that was entertaining :)
April 22, 2016

Complex number cartesian form
yes r^2 = 4 + 4 = 8 so r = sqrt 8 = 2 sqrt 2 - 2 - 2 i is in quadrant 3, 45 degrees below -x axis Theta = pi + pi/4 = 5 pi/4 or 180 + 45 = 225 degress so x = 8^.5 e^(5 pi i/4) now raise to power five raise (8^.5)^5 = 8^2.5 multiply angle by 5 25 pi/4 = 24 pi/4 + pi/4 which is ...
April 22, 2016

Math
-4 = x^2 - 4 x = 0 then y = -4 A
April 22, 2016

Physics
1. U = (1/2) k x^2 =(1/2)(3.792*10^2) (1.42^2)(10^-2) = 3.82 Joules 2. same 3.82 Joules 3. 3.82 + m g h = 3.82 + .294(9.81)(0.960) = 6.59 Joules 4. How long does it take to fall .96 meters? .96 = (1/2)(9.81)(t^2)
April 22, 2016

algebra!!!!
do you mean y = x^2 - 2 x - 6 ???? if so then 4 x + 10 = x^2 - 2 x - 6 x^2 - 6 x - 16 = 0 (x-8)(x+2) = 0 x = +8 or x = -2 C is looking good but check it if x = -2 does y = +2 work? yes if x = +8 does 42 work? looks good so C
April 22, 2016

Technology
Hard to say. If you tried to copy and paste, that does not work here.
April 22, 2016

Precal
log x + log (x-3) = 1 log (x^2 -3x) = 1 10^log (x^2 -3x) = 10^1 = 10 x^2 -3 x -10 = 0 (x-5)(x+2) = 0 x = +5 or - 2
April 22, 2016

Physics
a) m g h = 110 * 9.81 * 200 Joules (you left the mass out) b) m g h = (1/2) m v^2 c) The work done by gravity is the same, force of gravity times distance down. The work done by friction makes the kinetic energy (speed) less at the bottom. It does not change the change in ...
April 22, 2016

already know how
I see a long string of what seem to be standard end of semester questions and I am being asked to do them despite having done so half a century ago. I see no attempt by the student or students to do the problems or any indication of what the difficulty is. All I see is an ...
April 22, 2016

College Algebra
v = Vi c^t .692 = c^3 c = .692^(1/3) c = .884 every year the car loses (1-.884) = .116 or 11.6% of its value value = initial value * .884^t
April 21, 2016

Math
9:45 do you not have a clock?
April 21, 2016

math
a lot of different things for example 6 (4+4) = 24 + 24 = 48 (2+2+2)(8) = 16 + 16 + 16 = 48 (1 + 5)(2 + 6) = 1(2+6) + 5(2+6) = 8 + 5*8 = 8 + 40 = 48 etc etc etc etc .......
April 21, 2016

Geometry
so divide your 85,403 by 9 9,489
April 21, 2016

Math
(1/2)(4/3)pi r^3 a little bigger than (2)(4^3) 2 * 64 128 a
April 21, 2016

english
Both are correct. The first means she has it now. The second means she had one in the past.
April 21, 2016

english
The police on the street and even the courts seem to employ different interpretations of the "innocent until found guilty" principle depending on the race of the suspect.
April 21, 2016

math- pre calc
x is negative in Q 2 (n/13)^2 + (5/13)^2^2 = (13/13)^2 12=n so x = 12/13
April 21, 2016

HELP PHYSICS PLS :)
In an elastic collision energy is conserved. NOT if it is inelastic. What is conserved in both cases is momentum. The total kinetic energy at the bottom = (1/2) m v^2 where m = 2.1 + .015 = 2.12 kg so your PE at top = (1/2)(2.12)v^2 solver for that v at the bottom. Then use ...
April 20, 2016

Physics
constant speed means no acceleration F = m g = 608 N W = force * distance = 608*4*5 = 12,164 Joules same but force opposite to motion for gravity -12,164 signs reverse if going down
April 20, 2016

math
3 x^3 (x-2)
April 20, 2016

math
if a circle of radius r then pi r^2
April 20, 2016

Physics
total R = 28 so i = EMF/28 = 1.5 so EMF = 1.5*28 = 42 volts voltage drop internal = 1.5*3 = 4.5 volts so terminal V = 42 -4.5 = 37.5 volts power waste = i^2R = (1.5)^2 * (3) = 6.75 Watts
April 20, 2016

Math
a + (3a+12) = 90 4 a = 78 a = 19.5 degrees 90 - 19.5 = 70.5 check 3(19.5) + 12 = 70.5 ok
April 20, 2016

math help pls pls pls
at x = 4 h = -16 +32 + 2 = 18 ft at x = 1 h = -1 +8 + 2 = 9 ft so from x = 1 to x = 4, the water went up 9 feet the average speed = 9/3 = 3 feet/second so yes c
April 20, 2016

ethics
My cat pretty much decides what he is going to do next.
April 20, 2016

Physics
if speed o sound = V meters per second then 2 V
April 20, 2016

science help PLS
Yes, the first choice is most likely.
April 20, 2016

Maths
conditional: If a cow, then a mammal Draw a small circle with a cow in it completely inside a big circle with other mammals in it. Alligators and dinosaurs are way outside even the big circle converse: If a mammal, then a cow (maybe, false) In big circle, maybe not in little ...
April 20, 2016

nah
0.00
April 20, 2016

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