Thursday
February 11, 2016

Posts by Damon

Total # Posts: 25,219

MATH
if y = 0, x = 3 so (3 , 0) if x = 0, y =-6 so (0 , -6) if x = 1, y =-4 so (1 , -4)
December 9, 2015

MATH
6 y - 15 = 4 x - 4 6 y = 4 x +11 y = (2/3) x + (11/6)
December 9, 2015

Algebra
2. (4/5) x = 10 4 x = 50 x = 12.5 ------------ check 10 - (4/5)12.5 10 - 50/5 10 - 10 0 yes
December 9, 2015

Algebra
1. 5 x - 1/3 = 4 2. (4/5) x - 3 = 7 3. r s = u - t s = (u-t)/r 4. n = q - m/p
December 9, 2015

Physics
force = rate of change of momentum F = 2 * 6/(7*10^-4)
December 9, 2015

physics
16*30 - 4*50 = 20 v
December 9, 2015

Physics
see above
December 9, 2015

physics
F = k x k = 2 g/6.1 cm 2.5g = (2g/6.1cm) x x = 6.1 (2.5/2) cm
December 9, 2015

math
15-8
December 9, 2015

Pre - Cal
origin at center of roadway, 40 meters from each end. and at height of road points (-40,20), (0,4)which is vertex, (40,20) (y -4) = k x^2 16 = k (40)^2 k = 16/1600 = .01 so y = .01 x^2 + 4 ============================== at x = 20 y = .01(400) + 4 = 8
December 9, 2015

5th grade math
40 (n-3) = 39 n 40 n - 120 = 39 n n = 120 each 39 (120) = 4680
December 9, 2015

math/science
yes, outer shell full
December 8, 2015

Chemistry
greater than because positively charged
December 8, 2015

Chemistry. I got the wrong answer. Plz help
NaCl = 23+35.5 = 58.5 g/mol so 234/58.5 = 4 mols of NaCl that requires 23 * 4 = 93 grams of Na
December 8, 2015

math
m squares lengthwise n squares width wise m/n = 4.5/3 n*m = 24 so m = 24/n 24/n / n = 4.5/3 24/n^2 = 4.5/3 n^2 = 16 n = 4 then m = 6 3 feet/4 squares = .75 feet on a side for the squares
December 8, 2015

Science Help
Helium is in the noble gas group because its outer shell is full despite having only two electrons. Therefore like the rest of that column it does not react with much of anything.
December 8, 2015

Trig
cos/(1-sin) - tan ??? cos(1+sin)/(1-sin^2) - sin/cos cos (1+sin) /cos^2 - sin/cos (1+sin)/cos - sin /cos 1/cos
December 8, 2015

Math
M = 1/24 puzzle/min H = 1/16 puzzle/min together 1/24 + 1/16 puzzle/min = 2/48 + 3/48 = 5/48 puzzle/min so 48/5 min/puzzle = 9.6 minutes
December 8, 2015

Chemistry. Plz Help!
do this the same way I did the CO2 problem
December 8, 2015

Math
2 w + 2(w+8) = 54 4 w + 16 = 54 4 w = 38
December 8, 2015

Chemistry. Plz Help!
C + O2 ---> CO2 Mols of C 20.4 /12 g/mol = 1.7 mol of C result is 1.7 mol of CO2 C = 12 O2 = 32 CO2 = 44 g/mol 1.7 mol * 44 g/mol = 74.8 grams
December 8, 2015

Physics Energy
Why would the power not be wasted in heat and compression of the ball to a great extent? In .7*10^-3 seconds the bat accelerates the ball from zero to final speed over a distance of .014 meters I assume the acceleration was constant during that time so the average speed over ...
December 8, 2015

Math
y = m x + b inverse x = m y + b y = (x-b)/m ----------------- 5 = 5 m + b or 5 m = 5 - b 5 = (5-b)/m or 5 m = 5 - b --------------------------- 5 m = 5 - b if m = 1 5 = 5 + b and b = 0 5 = (5-b)and b = 0 so f(x) = x should do (that should have been obvious :)
December 8, 2015

Math
(130/4) miles/gallon * 6 gallons = ?
December 8, 2015

Math
y = x
December 8, 2015

Calculus
in foot system g = -32 ft/s^2 Hi = 80 v = Vi - 32 t at max height v = 0 so Vi = 32 t at top so Vi = 32 * 2 = 64 ft/s h = Hi + Vi t - 16 t^2 h = 80 + 64 t - 16 t^2 h = 80 + 16 t^2 at top when
December 8, 2015

Calculus AB
Well y = 3 is continuous graph it from x = 4 to x = 7 A does it have a maximum? B does it have a minimum? C is it bigger at 7 than at 4? D is 3 equal to 18?
December 8, 2015

Physics
22.4 * 3.14 Liters
December 8, 2015

Physics
It depends on the pressure inside the car. after a few minutes the car will fill with water from holes in the floor etc and only a bubble of air at ambient (water) pressure will remain under the roof (avoid leaky sun roof). At that point the door (or window) will open easily.
December 8, 2015

Physics
Enough already, what did you get?
December 8, 2015

Spanish
LOL - name is the same in US pharmacies. It is not the cat stuff.
December 8, 2015

Calculus
Let me get this right - you want me to square all these differences to save you the trouble of doing it. I already took the course. Let us see what you did.
December 8, 2015

physics
F = m a constant F constant m so constant a
December 8, 2015

math
8/225 = 2 pi r/360 :)
December 8, 2015

Science
I thought I did. Read what I write carefully.
December 8, 2015

Science
1. agree height is twice amplitude and wavelength is distance between crests 7. agree but actually not really. The frequency did not really change, only the frequency you hear changed due to Doppler effect. 9. agree. yes, sonar sends out a pulse of sound and sees how long it ...
December 8, 2015

Physics
I assume hands under shoulders x = CG to feet hands hold 268*2 = 536 N so 536 * 1.36 = 750 x x = .972 m from CG to feet 1.36 - .972 = .388 CG to hands (shoulders)
December 8, 2015

Mathxxx!!!
before I respond I would like to see your attempts. By the way if you can solve for x, there is a solution. If it is impossible to solve, there is no solution. So tell me what x is in problems one (a tricky one) and two. if you have 5 x and only 5 x on one side and 5 x and ...
December 8, 2015

math
yes
December 8, 2015

College Physics
nobody knows because you did not give me: specific heat of ice heat of fusion of water specific heat of water heat of vaporization of water Cp of steam Energy = 10 grams (or .010 kg if using kg) times the sum of: [5 deg * spec heat ice + heat of fusion of water + 100 deg * ...
December 8, 2015

Physics
300 rev/min (2 pi radians/rev)(1 min/60s) =31.4 radians/second 31.4 rad/s * 1 m = 31.4 meters/second
December 8, 2015

Physics
another way (easier) The force F times 5 meters = potential energy lost in water = m g (height above water) note no pe change below water because buoyancy is about the same as weight 5 F = 45 * 9.81 * 8 F = 706 Newtons
December 8, 2015

Physics
well, there is a rick you can use here to make it easy. If the force is constant, then the average speed is halfway between the starting speed and the final speed (which is zero here. So what is the speed when he hits the water? v final = sqrt (2 g h) =sqrt(2*9.81 * 8) = 12.5 ...
December 8, 2015

Physics
ke = (1/2) m v^2 goes until that energy is stored in spring so (1/2) m v^2 = (1/2) k x^2
December 7, 2015

Physics
kinetic energy coming to the jump = (1/2) m(121) kinetic energy at the top = (1/2) m (1) loss of Ke = (1/2) m (120) = gain of potential = m g h (note that the mass is irrelevant, big person goes as high as small one if same speeds) so (1/2)(120) = 9.81 h solve for h
December 7, 2015

math
4.44 is the biggest
December 7, 2015

whoops
yes, you need that -1 at the end
December 7, 2015

Typo
3 cos (x/2 - pi/4) That is very close to what you have except for that strange -1 at the end.
December 7, 2015

Math please help
well it ranges from -4 to +2 -4 to 2 = 6 so you are right the amplitude is 3 y = 3 cos (a x - phi) when x = pi/2 , cos (a x - phi) = 1 so a pi/2 - phi = 0 because cos 0 = 1 when x = 5 pi/2, cos ( a x- phi) = -1 so a 5 pi/2 - phi = pi, because cos pi = -1 so we have two ...
December 7, 2015

Physics Help
Re is distance from earth center first checking your paragraph force on each = F = G m ME /Re^2 dF/dr = -G m ME 2 Re / Re^4 = - 2 G m ME/Re^3 so if dr = 2a then dF = -4 G m ME a/Re^3 agree Hey, surely you mean mass = ρ(4/3) pi a^3 !!!!!!!!! Mutual Force = G m^2 /(2a)^2 = ...
December 7, 2015

Physics
2.96*10^-5 /(.0028/4) = .0423 m^3/s
December 6, 2015

Physics
try 4 times that :)
December 6, 2015

Physics
A=3.14*0.03^2=.0028 !!!!!!!!!!!!!!!!!!! .03 is DIAMETER NOT Radius you want A = pi D^2/4 otherwise you have the right idea
December 6, 2015

math
sin 5 x = 0 well, zero and every time 5 x is a multiple of 180 if x = 0 , sin 5 x = 0 if x = 180/5 = 36, sin 5 x = 0 if x = 360/5 = 72 in fact for any multiple of 36 until we reach 9 9 * 36 = 324 and sure enough sin 5*324 = sin 1620 = 0
December 6, 2015

Math
y = 3 x invert x = 3 y y = x/3 sure enough you got it :)
December 6, 2015

8th Grade pre Algebra : HELP!
0.123123123... 123/10^3 + 123/10^6 + 123 /10^9 ..... = (123/1000)(1 + 10^3 + 10^3*10^3 + 10*3*10*1*10^3 ...... = (123/1000) (a + ar + 1 r^2 ..... a = 1 r = 1/1000 is infinite geometric series sum = 1/(1-r) so =(123/1000)(1/(1-1/1000) = 123/1000 (1/999/1000) =123/999 try 123/...
December 6, 2015

8th Grade pre Algebra : HELP!
question 9 Do you know how to convert a REPEATING non-terminating decimal into a quotient of whole numbers.
December 6, 2015

8th Grade pre Algebra : HELP!
Question 5 I do not understand - typo?
December 6, 2015

8th Grade pre Algebra : HELP!
First try yourself. Post what you did. The first couple I am sure you can do. like what is 5 * 5 * 5 and what is the square root of (5*5) /(8*8)
December 6, 2015

Applied Calc
Get it ?
December 6, 2015

Applied Calc
Otherwise I am agreeing with Wolfram
December 6, 2015

Applied Calc
whoop, that is 3 x^5 not 4 x^5
December 6, 2015

Applied Calc
(1-x)^6 = 1 - 6x + 15x^2 - 20x^3 etc multiply by x^2 so x^2 - 6x^3 + 15x^4-20x^5 .....etc THEN integrate (1/3)x^3 - (3/2)x^4 + 4x^5 -(10/3)x^6 ... etc
December 6, 2015

Applied Calc
The only thing I know to do is multiply (1-x)^6 out (use binary coefficients) then you have a whole string of simple ones which is why the answer at Wolfram starts with someting times x^9
December 6, 2015

Applied Calc
go to http://www.wolframalpha.com/input/?i=integrate+x%2F%281-x%29 type in: integrate x^2(1-x)^6 It is a serious mess !!!
December 6, 2015

math
f' = -2x e^(1-x^2) zero when x = 0 f" = -2x (-2x e^(1-x^2)) -2 e^(1-x^2) = (4 x^2 -2)e^(1-x^2) when is that negative ? e^whatever always + so when 2 (2x^2-1) is negative x^2 always + when x^2 <1/2 -1/sqrt 2 < x <1/sqrt 2 ?
December 6, 2015

Math
y = (-2) x
December 6, 2015

Applied Calc ah !
now go to http://www.wolframalpha.com/input/?i=integrate+x%2F%281-x%29
December 6, 2015

Applied Calc ah !
well, first multiply top and bottom by (1 - sqrt x) (1-sqrt x)^2 ------------ dx 1 - x (1- 2 sqrt x )^2 ------------ dx 1 - x dx/(1-x) - 2 x^.5 dx/(1-x) + 4 x dx/(1-x)
December 6, 2015

algebra
7 + 4/4 - (3 + 1/4) = 7 - 3 + 4/4-1/4 = 4 + 3/4 = 4 3/4 =============== check 3 1/4 + 4 3/4 = 7 4/4 = 8 whew!
December 6, 2015

physics
she loses potential energy as she falls and gains speed (kinetic energy) m g h = -70 * 10 * 2.5 Joules
December 6, 2015

mnps
2.4 m + 2.6 m = 5 m 10 - 5 = 5 m left
December 6, 2015

Algebra 1, Physics
for Muriel height at x = 10: y = - (9.8/14^2) (100) + 10 + 2 y = -5+12 = 7 meters high for Connie height at x = 10 y = -(9.8/16^2)100 + 10 + 2 = -3.8 +10 + 2 = 8.2 m high 7 meters is about 21 feet. That is not very high but will do 1 story with a slightly pitched roof.
December 6, 2015

calculus
if you are using our moon and are close to it, g = (1/6) g earth approximately I am not sure we can make those assumptions.
December 5, 2015

calculus
This could only be an MITx problem I left there in 1959 so this will only be a rough attempt. NOTE - I am using h, the height for above surface and d for total distance from center. We want f(h) first Moon center at C d = r + h distance from center of moon at P when at P, how ...
December 5, 2015

physics
I did the hard part. I assume you can do the both at the same time part.
December 5, 2015

Hey, check and see if I have already done it before posting again
http://www.jiskha.com/display.cgi?id=1449357347
December 5, 2015

physics
Ah, I just did this about an hour ago.
December 5, 2015

gifted ELA
If I did English and not physics I would strike for more pay.
December 5, 2015

physics
Weight number 1: 48 + 8 + 19.5 = 75.5 kg on the wagon 19.5 kg back at 9 relative to ground and girl so 75.5 u = 19.5 * 9 u = 2.325 forward now weight number 2 before throw: momentum = 75.5 * 2.325 = 175.5 relative to ground after throw missile momentum back relative to ground...
December 5, 2015

no way - typo?
on what planet is 1 atm = 2 atm ?
December 5, 2015

Physics/Science
delta T = 30 - 420 = - 390 delta t = 50 min so -390/50 = 7.8 degrees per minute
December 5, 2015

Math Nunbers
call it A*100 + B*10 + C then we know A + B + C = 19 B + 4 = 2 A C*100 + B*10 + A + 99 = A*100 + B*10 + C now plug and chug
December 5, 2015

Physics
well, we have .035 kg of ice at -14 we have .4 kg of water at 0 If those really are the numbers, the answer is that some of the water gets frozen by the ice which is 14 degrees BELOW freezing. At least 35 grams of ice will be left. How much water can we freeze? How much heat ...
December 5, 2015

Statistics
I get .5393
December 5, 2015

Statistics
100 trials probability of success = .9 probability of failure = .1 we need P(86) P(87) P(88) etc down to P(91) This is a binary distribution problem Then add them all I will do one of them P(86) = 100C86 * .9^86 * .1^(100-86) 100C86 = 100! /[ 86!(14...
December 5, 2015

Chemistry (Gas)
Yes, assume 1 atm and around 0 to 20 C the water would be frozen at 0 (unless salt :) and is probably not much more than 20 that range is small compared to 273 so close enough for your scuba tank calculation.
December 5, 2015

algebra
192 = 112 t - 16 t^2 or 16 t^2 - 112 t + 192 = 0 t = [ 112 +/- sqrt ( 12544 - 12288)]/32 t = [112 +/- 16 ]/ 32 t = 3 seconds on the way up and t = 4 seconds on the way down
December 5, 2015

hj
mary + 3 mary = 480 4 mary = 480 mary = 120
December 5, 2015

Physics/Science
17 degrees in 45 minutes = 17/45 = .378 degrees/minute
December 5, 2015

science
Well, Silver Sulfate is relatively insoluble and I suspect it is the precipitate. Calcium Nitrate is soluble.
December 5, 2015

Calculus
I have a hunch that f is in MILLIONS f(t)= (1/2)(1.498) t^2 + 1.626 t + c to find c put in year 2 8.893 = (1/2)(1.498) (4) + 1.626 (2) + c
December 5, 2015

science
Well, it is certainly not from over on the right there where the Halogens live. Since Cl is a halogen, group 7 which is missing an electron in the outer shell and wants to grab one to become a Cl-1 ion, we really want something with an extra electron easily removed. That means...
December 5, 2015

Algebra
You are welcome.
December 5, 2015

Algebra
jordan worked n maria worked (8/5) n (8/5) n - n = 15 8 n - 5 n = 75 n = 25 (8/5)n = 40
December 5, 2015

social studies? i think idk
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=14&cad=rja&uact=8&ved=0ahUKEwjr5422qMXJAhVFmh4KHW3bBoQQFghdMA0&url=http%3A%2F%2Fhenryfordchangingtpm.weebly.com%2Feconomic-impact.html&usg=AFQjCNHncn7Vo0UvgMcMiqaThUZeGZh_rA&sig2=6FSowIEVir_5jW55Bu1m4Q
December 5, 2015

social studies? i think idk
Henry Ford at his Ford manufacturing plant was responsible for some pretty interesting concepts in economics and manufacturing technology. Google Henry Ford maybe.
December 5, 2015

Mathematics
write x^2 + 10 x add half of ten squared 5^2 = 25 so x^2 + 10 x + 25 is a perfect square so we need to add 2 to 23 to make 25 and then (x+5)^2 = x^2 + 10 x + 25
December 5, 2015

Math 7
Oh well, all right, just this once.
December 5, 2015

Math 7
7 th math - are you there? How do the rest come out? I have worn out my pencil and paper.
December 5, 2015

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