Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 17,557

**MATH**

2, yes 1/2 3. I guess you want p(red)which is 5/8 4. You have to specify what you want, not imply it. What if the question asked what is the probability CD is ***NOT*** scratched or of NON-fiction

**MATH**

1. Sam flips two coins. Find probability of 1 head and 1 tail. I think 2/4 or 1/2 ----------------------------- yes, 4 possibilities including h,t and t,h so 2/4 = 1/2

**what is theta ?**

to convert to rectangular form I need an r and a theta then x = r cos theta and y = r sin theta

**Science**

I never heard of a glacier flowing uphill :) They certainly do flow downhill to the ocean.

**Science**

I answered this

**Pre-Calculus**

r = sqrt (4^2+3^2) which we know is 5 because of 3 4 5 right triangle so we do not need c^2=a^2+b^2 -4 = 5 cos theta cos theta = -4/5 theta = 143 if you use your calculator but that would be wrong because we are in QUADRANT 3 where sin and cos BOTH negative cos^-1 4/5 = 36.9 s...

**math**

yes, but divisible by 4 means x/4 = whole number 4 is divisible by 2 BUT 2 is NOT divisible by 4

**math**

1 2 3 4 5 6 the only one divisible by 4 is 4 1/6

**sorry, no idea**

I never heard of it.

**Pre Calculus**

r = 3, theta = 0

**Pre-Calculus**

r cos theta = x = -2.598 = - 3(sqrt3/2) r sin theta = y = +1.5 (-2.6 , 1.5 ) or exact: (-3 sqrt 3 /2 , 3/2 )

**Science**

Try b If the pressure is high enough, the ice can be pushed uphill or in any direction toward lower pressure. This is not common but happens.

**Science**

Now wait a minute, where do you think icebergs come from (think Greenland or Alaska or Antarctica). I think c --------------------------------- agree on conservation plowing although I suppose you could also call it recycling. terracing is making various flat levels like stair...

**Science**

So yes, C

**Science**

Force times distance in direction of force If not moving in cafeteria line - no work If moving forward in line and weight of tray is down, force not in direction of motion --> NO WORK

**Science**

NO !! F = m A m is just a scalar Acceleration in the SAME direction as applied net force

**History**

A for sure B quite a few in Rome, Greek cities, Sicily C not really yet D Yes, after he crossed the Rubicon E. Like C, I think the real trouble was after Julius Caesar and his successor Augustus (Octavian)

**Phsyics**

rho g h + Pa 1000 kg/m^3 * 9.81 * 66.1 + 101,300 648,441 + 101,300 = 749,741 Pascals 7.50 * 10^5 Pascals two decimal places here only makes sense if using scientific notation

**English III**

suspect making fun of both, but I have not read the whole thing.

**English III**

I am not sure about it, like you know

**English III**

To make fun of the manner of speaking that the writer is criticizing

**English III**

Where are the limbs out on which we once walked? :)

**MATH**

1 2 3 4 5 6 primes: 1 3 5 so 3/6 = 1/2 ----------------- 5/6 YES, you got a NOT !!! :) ------------------------- yes -------------- yes

**S.S (DAMON)**

I think you can come up with answers from the definition of interdependence: http://www.vocabulary.com/dictionary/interdependence You mean for countries, but use people or plants or animals as examples.

**Physics**

density = 1000 kg/m^3 volume = 26 * 32 * 3 = 2496 m^3 so mass = 2.496*10^6 kg so weight = 9.81*mass = 24.486 *10^6 N = 2.45*10^7 N

**science motion short answer**

position for example would be meters in SI units, but could be inches or leagues or light years and you must specify units or be completely wrong. Actually in SI units your 1 hour to school was 3600 seconds. The point is that you must specify.

**science motion short answer**

I ran fifty (miles? degrees? millimeters?) I am sure you can come up with two more :)

**math**

[ -1 +/- sqrt (1 + 72) ] / 2 - 1/2 +/- (1/2) sqrt (73) Hey if a x^2 + b x + c = 0 then x = [ -b +/- sqrt(b^2 - 4 a c) ] / (2a)

**MATH**

19 20 21 22 23 16 17 18 so 5/8

**Damon/ Math**

You found probability that it IS white BUT It asked for the probability that it was NOT white 31/31 - 6/31 = 25/31

**S.S (DAMON)**

question 15 (5) is missing 11(1) b --> A 12(2) d is fine 13(3) A --> d 14(4) d --->a 15 missing

**S.S (DAMON)**

11 (1) Is A, Soviet Union !!!!

**science (check answer?)**

I think Aluminum is all metal. My only question would be Germanium which is considered a "semi-metal being a semiconductor. However I really think they are all metals.

**math**

That is much harder because I can not factor it. Have to use quadratic equation x = [ -1 +/- sqrt (1+16) ]/2 x = -1/2 +/- (1/2)sqrt(17)

**math**

5 x^2 + 4 x - 1 = 0 (5x-1)(x+1) = 0 x = 1/5 or x = -1

**math**

yes, that is the way dice is supposed to work.

**math**

Hey, that word NOT again !!!!!

**S.S (DAMON)**

6 (1) yes 7 (2) I think d not c hint is "helping" 8 (3) I think b not a 9 (4) yes 10(5) Carnival !!!!!!! santeria mixes but is a religion not a festival, diaspora is dispersal of a people, carnival is fun !! although before Lent, all participate, voodoo is sort of a ...

**Which compound is made up of three elements?**

H O Ca Cl H N O Na O

**math**

yes

**algebra**

6 y = - 4 x + anything y = (-4/6) x + anything else slope = -4/6 = -2/3

**math**

agree

**math**

21 + 4 + 12 + 18 = 55 so 4/55 yes

**math**

probability that it IS 23 is 1/11 probability that it is NOT is 10/11

**Physics**

specific heat of fresh water = 4186 J/kgdegC heat in = 4186*100* 20 = 8372,000 Joules = 8372 kJ

**Linear Algebra**

x-4y=12 and y=1/4x-3 a. one b. two c. infinitely many d. none ------------------------- x - 4 y = 12 x - 4 y = 12 Once again both lines are the same, infinite solutions, a y for every x

**Linear Algebra**

y=4x+3 and y=4x+4 a. one b. two c. infinitely many d. none ------------------- Those two lines are PARALLEL. They never cross!! No solutions in Euclidean geometry (There are in other systems of geometry)

**Linear Algebra**

How many solutions does the system of equations have? 2x=-10y+6 and x+5y=3 a. one b. two c. infinitely many d. none ---------------- Those two lines are THE SAME For every x there is a y infinite solutions, no intersection.

**S.S (DAMON)**

I think so.

**S.S (DAMON)**

I think so. In number 4, certainly D is a factor but I think B more usual and important.

**S.S (DAMON)**

I think the rest are ok but Costa Rica has by far the most stable democracy.

**S.S (DAMON)**

2. NO !!!! B checking the rest 1 os ok

**science**

An example of a net force of zero could be a squeeze between your fingers. If you squeezed hard enough I suppose you could split the wood. However I would tend under reasonable conditions to agree with your answer. If it had said a rubber, I would have said you could stretch i...

**science**

You can add the magnitudes of forces if they are in the same direction. However watch out. You can not just add them if they are not in exactly the same direction.

**science**

If you have two 5 Newton forces pushing a block to the right, that is a total of 10 Newtons pushing to the right. There may also be a moment due to the forces, but that is not part of the question.

**Global Studies**

YIKES !!!!

**S.S (DAMON)**

I have to see what you think first. I will check after lunch.

**science one question**

The questions are overly simplistic. It is impossible to change velocity at constant speed without acceleration. Even if going around a circle at constant speed, you have centripetal acceleration. In other words if you change direction at constant speed you need acceleration a...

**science one question?**

You are welcome, hardly a challenge though. Inches are certainly not SI :)

**science one question?**

SI: meter , kilogram , second so meter is distance unit in SI system We used to call it the MKS system.

**Physical Science**

Visible light photons are not energetic enough to penetrate skin and flesh.

**math You have a typo**

6" = .5 ft 3" = 3/12 ft = .25 ft 13.25 * 12.5 = 165.625 typo somewhere :( I bet it is 11' s" by 12' 6" because that gives140.625

**Physics**

weight down = m g = 97*9.81 = 952 N friction up = 810 N net force down = 142 N 142 = 97 a a = 1.46 m/s^2 v = a t 3.7 = 1.46 t at bottom so t = 2.54 seconds d = (1/2) a t^2 d = .5 (1.46)(2.54)^2 d = 4.69 meters long

**Check my social studies(PLEASE)**

I am no expert on this subject but: 1. I think B 2. ? not sure 3. ? not sure 4. I think d 5. I think a 6. I think c 7. I think c 8. I think c 9. I think a 10. I think c Perfect, we agree on not a single question ! Nada !!!

**Plz help me.**

I am a naval architect and a little touchy on the subject of the scientific world forgetting about the ocean and its basic importance :)

**Plz help me.**

By the way, all of this seems to leave the world oceans out. They fix more CO2 out of the atmosphere than anything else with phytoplankton photosynthesis. http://en.wikipedia.org/wiki/PI_curve

**Plz help me.**

1. D yes agree 2. D yes agree 3. C I believe 4. I think A, disagree with you. I am not entirely sure that trees fixing CO2 out of the atmosphere is a comprehensive solution though, but it would help. It certainly hurts to cut forests down and burn them up filling the sky with ...

**Physic II**

Q = V C V = i R i = - dQ/dt so i R = Q/C -dQ/dt = Q/(RC) -dQ/Q = dt/(RC) -ln Q = - t/(RC) Q = k e^[- t/(RC) ] as we all knew when t = 0 Q = Qi so Q = Qi e^[-t/(RC)] when is Q = .55 Qi ?? .55 = e^[-t/(RC)] ln .55 = -.5978 = -t/(RC) so t = 0.5978 R C

**Physic II**

C = Q/Vc so Q = CVc = integral i dt so Vc = (1/C) int i dt Vc = 0 at start 25 = i R + Vc 25 = i R + (1/C) int i dt 0 = R di/dt + i/C di/dt = -i/(RC) di/i =-dt/(RC) ln i = -t/(RC) i = e^[-t/(RC)] when t = 0, Vc = 0 and i = V/R i = (V/R) e^[-t/(RC)] Remember from above Vc =(1/C)...

**College math**

area = pi r^2 = 16 pi = 50.26548246 m^2 approximately circumference = 2 pi r = 25.13274123 meters

**College math**

You are welcome :)

**College math**

c^2 = a^2 + b^2 the hypotenuse is always the longest side.

**Maths**

two yellow and 10 total 2/10 = 0.2 or 1/5

**I give up**

I tried this with algebra a day or two ago and was unable to find the lower limit. I suspect it is zero but was unable to prove it with algebra.

**math**

b = shoe price s = sock price 2 b + 4 s = 125 times 3 3 b + 5 s = 182 times 2 6 b + 12 s = 375 6 b + 10 s = 364 ----------------- subtract 2 s = 11 s = $5.50

**Science question, only 1**

Only water not present in oceans is available for living things to use. Almost all of the water on earth is salt water in oceans.

**Physics**

5*200 = 1,000 watts = 1 kw 1 * 8 = 8 kw hr 8 cents/kw h * 8 kw h = 64 cents every 8 hours

**physics**

y = A sin 2 pi f t y"=-A(2 pi f)^2sin 2pift = -(2 pi f)^2 y -k y = m y" - k y = - m (2 pi f)^2 y (2 pi f)^2 = k/m f = (1/2pi)sqrt(k/m) f = (1/2pi) sqrt (200/50) f = 1/pi = .3183098852 Hz call it 0.318 Hz

**Science check my answers**

Fresh water is scarce but we have oceans full of salt water. 2 is C I believe.

**science**

A chemical bond was broken in separating H2O into hydrogen and Oxygen. New chemical bonds were made between the 2 hydrogen atoms and between the two Oxygen atoms.

**science, pls explain this!**

Hydrogen and oxygen 2 H2O ----- > 2 H2 + O2 in other word 4 H+ ions gain an electron and combine to make 2 neutral hydrogen molecules 2 O ions lose 2 electrons each to become a neutral O2 molecule

**Algebra - Functions**

1811 - 1200 = 611 commission .05 * sales = 611 sales = $12,220

**Math**

P= N [ 1 - (1+r)^-n ] /r P = present value, what he pays N = payment amount r = interest rate/period n = number of payments here n = 120 months need compound interest rate per month, not quarterly .045/4 = .01125 1.01125^4 = 1.045765 per year (1+r)^12 = 1.045765 (1+r) = 1.0037...

**math**

(1/30)hour/entry * 630 entries = 21 hours 21 hours * $7.50/hour = $157.50 They are not paying her enough.

**Alegbra**

(2x+3)(x+2) = (2 x^2 + 7 x + 6) now use distributive property to multiply that by (x-3) x (2 x^2 + 7 x + 6) = 2 x^3 + 7 x^2 + 6 x -3(2 x^2 + 7 x + 6) =-6 x^2 -21 x -18 add and get sum = 2 x^3 + x^2 -15 x -18

**Pre Algebra**

10/51.3 = .1949 .1949/8 = .024366

**Alegbra**

area= (2x+6)(3x-2) - (3x-4)(x+3) = 6 x^2 + 14 x -12 -[ 3x^2 +5 x -12 ] = 3 x^2 + 9 x You did not say what x is so cost = 4.75(x)(3x+9) = 14.25 (x)(x+3)

**Algebra ll**

You are welcome, good luck :)

**Algebra ll**

sum of logs is log of product log3 (4 x^2 + 7 x -2) = 5 base ^logbase(z) = z so 3^[log3 (4 x^2 + 7 x -2)] = 3^5 or (4 x^2 + 7 x -2) = 243 4 x^2 + 7 x - 245 = 0 (x-7)( 4x+35) = 0 x = 7 or x = -35/4

**a**

The side is (2x+3)? then the area is: (2x+3)(2x+3) = 4 x^2 + 12 x + 9 if x = 6 then Area = 4(36)+12(6)+9 = 144 + 72 + 9 = 225, too big :(

**Alegbra**

9.3*10^7 3.4 * 10^-7

**business math**

to reduce by 12 % multiply by 1-.12 = 0.88

**S.S**

Did you indeed Google to find out why Napoleon was willing to sell the gigantic Louisiana territory to Thomas Jefferson?

**S.S**

Google Louisiana Purchase

**physics**

- (3000)(891) Joules

**Chemistry**

Sulfur chlorate I suppose

**Physics**

Do it all over very carefully is all I can suggest.

**Physics**

CHECK MY ARITHMETIC !!! It came out awful coincidental though.

**Physics**

initial momentum = m V1 + 3m V2 final momentum = 4 m V3 same final momentum as initial so V3 = (V1+3 V2)/4 initial Ke = .5 m( V1^2 + 3 V2^2) final Ke = .5 (4m) (V3^2) = 2 m(V3^2) = 4 (.5m)V3^2 so change = .5m (V1^2+3V2^2 - 4 V3^2) but V3^2 = (V1^2 + 6V1V2 + 9V2^2)/16 4 V3^2 = ...

**math**

9 kilometers in 60 minutes = 9 kilometers/ hour

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