Wednesday
April 23, 2014

Posts by Damon


Total # Posts: 16,211

physics
4 F up at one end, F up at the other so 100 + 50 = 5 F F = 30 4 F = 120 take moments around end close to the 100 kg painter. x is from that end (the 4F=120 end) to the painter) 100 x + 2(50) = 4(30) 100 x = 20 x = .2 meters

Algebra
x (28 x^2 + 59 x + 13) x (4 x + 1)(7 x + 13)

Physics
.41 omega^2 r = g omega^2 = 9.81/(.41*4.2) = 5.7 omega = 2.39 radians/second 2.39 radians/second *30 seconds/min *1 rev/2 pi radians = 11.3 rpm

Algebra
Now let's see, 2014 - 1991 = 23 so e(23) = .42(23) + 72.6 e(23) = 82.3 well, that is encouraging :)

Algebra
e = expectancy t = year - 1991 points are (t,e) (0,72.6) (5, 74.7) slope = (74.7-72.6) /(5-0) = .42 e(t) = .42 t + b 72.6 = 0 + b so b = 72.6 e(t) = .42 t + 72.6

fractions
divide rectangle in 12 boxes entire rectangle is a cup block off 1/3 which is 4 of the 12 boxes the remaining 8 of the 12 contains 2/3 cup use 1/4 of the 8 remaining which is 2 of the original 12 which means using 2/12 = 1/6

fractions
1/4 * 2/3 = 1/6

Dividing Radicals Problem!!
You are welcome :)

Dividing Radicals Problem!!
(-3-2sr48) = (-3 -8sr3)* (70sr2+8) ---------- = --------- * ------- 14 sr50-8) = (70sr2-8)* (70sr2+8) = -210sr2-560sr6-24-64sr3 = ---------------------- = (4900*2) - 64 = 24 +210sr2 +64sr3+560sr6 = ------------------------- -9736

Dividing Radicals Problem!!
I got A

Physics
Physics - Molly, Tuesday, February 11, 2014 at 6:54pm something is wrong in the answer, can you explain it again please?.. Physics - Damon, Tuesday, February 11, 2014 at 7:15pm Ok, Original I = (1/2)(143.1)(3.01^2 + 75.3*(3.01)^26 = 648 + 682 = 1330 kg m^2 Final I = 648 + 75.3...

U.S History - Need help!!!
You are welcome :)

U.S History - Need help!!!
We both like your answers to 1 and 2.

U.S History - Need help!!!
3 and 4 I bet you would not be in favor of spreading slavery to the west so: I bet you agree with this: I call upon them to exclude it from the Territory in question. Plant not its seeds in this uncorrupt soil.

us equality essay edit
The United States DEFINES itself as one unified nation, indivisible, with liberty and justice for all. So WE ASK - are the citizens of such an independent country truly free? The Constitution of the United States does not provide equality for the people. Since the being of th...

Algebra
6 f + 9 e </= 500 6 (20) + 9 (30) = 390 hours, sure that is less than 500 hours

Algebra
135/3 = 315/7 = 45 per hour 45 * 12 = $ 540

Physics
acceleration = change in velocity/change in time = 13/6 = 2.17 m/s^2 d = 0 + Vi t + (1/2) a t^2 = 12 (6) + 1.09 (36) = 111 meters another way is that if acceleration is constant, use average velocity (12+25)/2 = 18.5 m/s 18.5 * 6 = 111 meters sure enough

Algebra
value = v purchase price = p v = p - k t 24,000 = p - 3 k 19,000 = p - 5 k ------------------ subtract 5,000 = 2 k k = 2,500 per year (part a) 24,000 = p - 7,500 p = 31,500 v(10) = 31,500 - 25,000 = 6,500

Precalculus
(sqrt2+3)^2 - (sqrt2+3) let a = sqrt 2 so a^2 = 2 (a+3)^2 - (a+3) a^2 + 6 a + 9 - a - 3 a^2 + 5 a + 6 2 + 5 sqrt 2 + 6 8 + 5 sqrt 2

Physics
Ok, Original I = (1/2)(143.1)(3.01^2 + 75.3*(3.01)^26 = 648 + 682 = 1330 kg m^2 Final I = 648 + 75.3(2.89)^2 = 1276 1330 (2.1) = 1276 omega so omega = 2.19 radians/second

Physics
conservation of angular momentum (the figure skater spins faster when she pulls her arms in I1 omega1 = I2 omega2 I of platform = (1/2)(143.1)(3.01)^2 original I of student = m r^2 = 75.3(3.01)^2 final I of student = 75.3(2.89)^2

Math
-7 and +3 for example

science
A nuclear reactor is very specialized and does involve risk particularly with storage and disposal of fuel.

Science
Well, it is true, but if the solar panels are working it is daylight and you may not need the lamp. In that case you need an additional component, an energy storage device like a battery for example, that can store the power generated during the day to run the light at night.

Grade 8 math
I would multiply the two numbers greatest in magnitude as long as their product is positive. (-7)(-15) = + 105 If it had been -7 and +15, then the answer would have been negative, way to the left on the number line and therefore not greatest.

Subsitution Method Grrr
3 c + 5 a = 1025 c + a = 275 so c = (275 -a) 3 (275-a) + 5 a = 1025 825 - 3 a + 5 a = 1025 2 a = 100 a = 100 and c = 275-100 = 175

Subsitution Method Grrr
ah, andra, are you sure you did not mean: x + 5 y = 275 ???????

math
64/24 = 64/8 / 24/8 = 8/3

Rock help!
shale is generally soft compared to slate and would crumble if used as a chalkboard.

Physics
I have no idea what it looks like, sorry.

Physics
Unfortunately that file is in your computer, not on the internet.

Math
2 inches to 12 feet is one inch to six feet which is 72 inches the scale ratio is 1/72

Physics
If it weighs 36 pounds on Callisto it exerts a force of 36 pounds on Callisto toward the box from the center of the moon. Pounds is FORCE, not mass, and if you weighed it in pounds on Callisto with a scale, that is the gravitational force on it there.

Physics
d = 0.284 m in a time of 0.470 s .284 = (1/2) a (.47)^2 a = 2.57 again: .75(9.81-a)(.111) = I (a/.111) but now a = 2.57 .75(7.24)(.111) = I (2.57/.111) I = .026 kg m^2

Physics
how far between 0.470 s and 0.670 s well, I have a = 3.82 m/s^2 d = 0 + 0 + (1/2) a t^2 at .47sec d = (1/2)(3.82)(.47)^2 at .67sec d = (1/2)(3.82)(.67)^2 then subtract

Physics
I am very old and slow.

Physics
tension up on weight T = mg-ma = .75 (9.81 - a) moment = T(r) = .75(9.81-a)(.111) again Moment = I alpha but alpha = a/r so .75(9.81-a)(.111) = .0145 (a/.111) .8167- .08325 a = .1306 a a = 3.82 m/s^2 alpha = a/r = 34.4 rad/s^2

Physics
I = (1/2) m r^2 = .5*2.35*.111^2 = .0145 moment = I alpha 7.357 * .111 = .0145 alpha alpha = 56.4 radians/s^2 yes

binomial distribution
binomial coefficients for n = 5: 1 5 10 10 5 1 p = .3 1-p = .7 P(0) = .3^0 (.7)^5 = .168 p(1) = 5 (.3)^1(.7)^4 = .360 P(2) = 10 (.3)^2(.7)^3 = .309 P(3) = 10 (.3)^3(.7)^2 = .1323 P(4) = 5 (.3)^4(.7)^1 = .028 P(5) = 1 (.3)^5(.7)^0 = .002 first answer is P(3)+P(4)+P(5) second an...

algebra based physics
I am supposed to just do all of these for you? I already took the course. Let's see your attempts so someone can tell where you are having trouble.

algebra
If it has slope 0, y is constant so y = 2 is the answer.

algebra
m = slope = [ 2 - (-5) / (-6 - 8) = 7/14 = 1/2 [ y - (-5) ] / (x -8) = 1/2 2 (y+5) = x-8 2 y + 10 = x - 8 2 y - x = -18

algebra
just did this, scroll down one

algebra
m = 6 1 = 6 (0 ) + b so b = 1 so y = 6 x + 1

algebra help please
4 a^2/8 + 3 a^2/8 = 7 a^2/8 15*5 = 75 and 25*3 = 75 so 5/5 * 4 c/15 + 3/3 * 8 c/25 20 c/75 + 24 c/75 = 44 c/75

physics
.55 = Vi(2) + (1/2) a 2^2 0.55 = 2 Vi + 2 a total distance after 4 seconds = .55+.77 = 1.32 m 1.32 = 4 Vi + (1/2) a (4^2) 1.32 = 4 Vi + 8 a -------------------- so solve these two equations for Vi and a: 1.32 = 4 Vi + 8 a 0.55 = 2 Vi + 2 a

Math~~
15/10 - 12/10 = ? 5 8/9 - 1 = 4 8/9

Palm Beach State
If you mean what you typed, then -30 x^7 if you meant to type (-6 x^7)^5 then (-6)^5 x^35 - 7776 x^35

Math-CHECK ANSWERS
They are all correct

No copy and paste software
You can not paste to here. You have to type it.

Math
.25 * 60 = 60/4 = 15 in tax 60 - 15 = $45 or just (3/4)(60) = $45

math
(x+5)(x+5) Foil x^2 + 5 x + 5 x + 25 = x^2 + 10 x + 25 or use distributive property x(x+5) + 5(x+5) = x^2 + 5 x + 5 x + 25 = x^2+10x+25 again

STATS
You are welcome :)

STATS
55% are below x z = .1 ---> F(z) about .55 .1 = (x - 75.5)/10.3 x - 75.5 = 1.03 x = 76.5

physics
Lamda = c * T T = L/c f = 1/T = c/L f1 = 348/.766 = 454.3 Hz f2 = 348/.780 = 446.2 Hz difference beat frequency = 8.15 Hz period of beat frequency = 1/8.15 = .123 s

Math(CHECK ANSWERS)
You are welcome :)

Math(CHECK ANSWERS)
5. seven pounds otherwise fine

math(HELP)
.06*350 = .25*120 = 120/4 =

Science
growing fruit, I suppose including apples

calculus
1/x is the slope of ln x which is very high when x is small and small when x is big

physics
75 sin 31

physics
75 sin 31 which is about 38 m because sin 30 = 1/2

Chemistry
MgCl2 needs 2 Chlorine atoms for every Magnesium atom so .3

chemistry
Now with that information and knowing that a mole of any chemical weighs its gram molecular mass I think you can do the rest for example a mol of water, H2O has mass 2 H + O = 2(1) + 16 = 18 grams so for water 18 grams is 6*10^23 molecules is one mole

chemistry
A mol is 6*10^23 of anything, sort of like a dozen is 12 of anything so 3.50 x 10^21 atoms (1 mol of atoms/6*10^23 atoms) = (3.5/6) 10^(-2) = .58*10^-2 mol = 5.8 *10^-3 = .0058 moles

Physics
by the way I could have done that really quickly by saying that the average speed up was half the starting speed. h = (1/2)(5)(.51) = 1.28

Physics
Vi = 5 m/s a = g = -9.81 m/s^2 v = Vi - 9.81 t v = 0 at top so 0 = 5 - 9.81 t t = .51 seconds to top h = Hi + Vi t + (1/2)a t^2 h = 0 + 5(.51) - 4.9 (.51)^2 h = 2.55 - 1.27 h = 1.28 meters

Physics
did that just below.

Physics
before you hit the brakes you go: 20*.5 = 10 meters then Vi = 20 m/s a = - 10 m/s^2 v = Vi + a t v = Vi - 10 T 0 = 20 - 10 t t = 2 seconds to stop after hitting brakes x = Xi + Vi t + .5 a t^2 d = 10 + 20 t - 5 t^2 d = 10 + 40 - 20 d = 30 meters we stopped 5 meters before the dog

Calc
integral of T dt from t = 0 to t = 256 divided by 256 [ 20 t + (5.25/1.75) t^1.75 ] at 256 - at 0 divided by 256 at 0 it is 0 [ 20(256) + 3 (256^1.75) ] / 256 20 + 3 (256)^.75 = 20 + 3(64) = 212 interesting, boiling point of water

Physics
Yes, the negative is unreal and wrong. The trajectory is a parabola. It crosses the x axis twice. However the first crossing is in our imaginations. It is before the kid dropped the bag, as if the bag had been thrown up from the ground instead of starting 34 meters up with an ...

Physics
h = 0 Hi = 34 Vi = + 2.3 (1/2) a = -g/2 = -4.9 h = Hi + Vi t - 4.9 t^2 0 = 34 + 2.3 t - 4.9 t^2 4.9 t^2 - 2.3 t - 34 = 0 t = [ 2.3 +/- sqrt(5.29 + 881) ]/ 9.8 t = [ 2.3 +/- 29.8 ]/9.8 t = 3.27 OR -2.8 the negative t was when it would have been at ground on the way up if it wer...

Physics
33 * 77 + 130 answer to a divided by (1.80+ 33/60)

Precalculus
radius bottom = 1.25 radius top = 1.25 + 5 tan 4 diameter top = 2 * radius top

physics
momentum before = momentum just after Vb bullet v block and bullet .039 Vb = (2.78+.039)v = 2.82 v now work on potential and kinetic energy after kinetic just after = .5 * 2.82 v^2 potential when stopped at top = m g h =2.82 * 9.81 * .291 = 8.05 Joules so 1.41 v^2 = 8.05 v = 2...

Physics
You are welcome :)

Physics
Yes, negative acceleration = deacceleration change in velocity is negative

Physics
or reverse a boat engine while steaming forward :)

Science
d is the only chemical reaction implied so I agree with you.

statistics
p = .4 so (1-p) = .6 binomial distribution n = 6 k = 4 C(n,k) = n!/[ k! (n-k)! ] = 6!/[4!(2!)] = 6*5/ 2 = 15 P(n,k) = 15 * p^k * (1-p)^(n-k) =15 * .4^4 * .6*2 = .1152

Calc
3 (ln x) - e^x 3 ln 1 = 0 e^1 = e so e

Calc
3*integral dx/x - integral e^x dx need I go further?

intermediate algebra
(9,000 -x)(0.05) + x (0.1) = 650

math
http://www.jiskha.com/display.cgi?id=1391813662

physics
initial x momentum = 2.6 m initial y momentum = 0 final x momentum = 1.3 m cos T + V m cos A final y momentum = 1.3 m sin T + V m sin A T is theta, the cue ball angle from x and A is the 8 ball angle from x now right off we know that the initial y momentum was zero so the fina...

math
They share the point (-1,-2) the first one goes right from there with slope 2 and the second one goes left from there at slope 1

math
There is no solution involved here, that is just two straight lines that at (-1,-2)

Algebra 2
.5 * .65 + .5 *.32 = .325 + .16 = .485 check probability other player wins = .5 * .35 + .5*.68 = .515 sum = 1, good :)

algebra & trigonometry
150*eggs + 100*oz meat </= 300

Southern Union
How fast is it going when it leaves the roof? v = a T d = .5 a t^2 64 = .5 * 3.35 * t^2 so t = 6.18 seconds on roof v = 3.35 * 6.18 = 20.7 m/s leaving roof Vertical velocity leaving roof = -20.7 sin 20 deg = -7.08 m/s horizontal velocity roof to ground = 20.7 cos 20 = 19.5 m/s...

math
maybe you mean ( 3 - e)^1 dx ??? or maybe 3 dx - e^1 dx ??? anyway the power 1 changes nothing so it is maybe (3-e) dx which is (3-e) x + C ???

statistics
So if you criterion is that any student counts plus any female student or not then it is (8 + 7 + 5)/27

statistics
I have the same question but perhaps I I list the four categories that the 27 students fit into you can figure it out yourself: a) 7 males (not student) b) 8 male students c) 7 female students d) 5 females (not student) so males not student = 7/27 male students = 8/27 female s...

Precalculus
Make block matrix 6 by 6 for total of 36 possible outcomes. Then count how many satisfy your criteria. 1. I get 20/36 = 5/9 2. agree 3. 2/36 = 1/18 4. 1/6 * 1/6 = 1/36 5. 1/6 + 1/6 = 1/3

Physics
distance = rate * time calculate the two distances 98 * 2 = 64 * 2 = ------------then subtract since it says meters, not kilometers, multiply answer by 1,000

Physics
delta x = .05 * 10^-9 m m = mass of electron delta p = mass of electron * delta v delta x * delta p = hbar/2 delta x * m * delta v = h bar/2 delta v = hbar/(delta x * 2 * m electron)

Physics
weight = 5*9.81 max static friction force =5*9.81*.8 = 39.24 N 5*9.81 * .22 = 10.8 moving friction 39.24 - 10.8 = 5 a a = 5.69 m/s^2

algebra 1
6m^4/5 divided by 2m 3 m^3/5 or (3/5) m^3

algebra 1
3/a^5 divided by 3/a^2 3/a^5 -------- 3/a^2 multiply top and bottom by a^5 3 ---------- 3 a^3 so yes a^-3 or 1/a^3

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