Wednesday

April 23, 2014

April 23, 2014

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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