Tuesday

July 22, 2014

July 22, 2014

Total # Posts: 17,486

**What is the question ?**

If both are true, then ay = ax and therefore y = x

**algebra**

x = year -1940 if x = 0 , y = 23,800 if x = 60, y = 113,100 slope = m = (113,100 - 23,800)/60 y = 1488.33 x +23,800 when year = 2040 x = 2040 - 1940 = 100 years y = 1488.33 (100) + 23800 = 172,633 so the last one

**Physics**

height = x sin theta potential energy = m g h = m g x sin theta assuming x is zero at the bottom and positive up ramp potential energy + kinetic energy = total energy = constant if ignoring friction potential = m g x sin theta kinetic = (1/2) m v^2 sum is constant so as x get...

**science pls help**

This is all the same question, Newton's second law. Force = mass * acceleration THINK !!!

**Math**

sum of 1 + 3 + 9 + 27 ..... 3^(n-1) geometric series a = 1 r = 3

**physics**

distance flown if level = d tan 78.6 = 5900/d d = 1190 meters in ten seconds so 119 meters/second

**Social studies check answers ***damon*****

largest cities ? Look at map, coastlines I would say A for the second one. Look at Brazil and Argentina and Columbia. The joke is that Peruvians descend from the Incas but Argentinians descend from the boat :)

**math**

8+8+8+8+8+8+8+8 = 64

**science URGENT so need help**

F = m a

**Needs plant biologist**

Hey, my degree is in Physics :)

**math**

yes yes assuming only one of them is white which is implied by the grammar.

**Dividing Polynomial**

2. yes 3 x^2 + 2 x + 3 R = -2

**Dividing Polynomial**

1. yes 5 x^2 - 4 x + 4 R = -11

**math**

2*6*6 ?

**not sure Writeteacher**

I do not know of anyone here who can help off hand. I think Jenny had best ask at the University of Chicago :)

**OK, I did it**

http://www.jiskha.com/display.cgi?id=1394740694#1394740694.1394743546

**please check(Social studies)**

I would not have thought of that answer but I would certainly include it. I would also include specifics such as trade connection between Byzantine Empire and the Vikings (I say that because it is very important in the news right now but no one knows that except historians and...

**Science**

Hey, go Google Periodic table. Table was invented before protons and electron valence effects were known about. It is D historically.

**math**

yes. 1/10 for breakfast bars

**math**

yes 1/10 for the breakfast bars strange, most of your problems are easy but the two coins was a level higher

**math**

four possibilities h h h t t h t t only ONE of the four is two heads so 1/4 NOT 1/2

**physics**

take an element d A where A is the angle around the cylinder tension T to the left tension T + dT to the right then normal force toward center = (T+dT)(dA/2) + T(dA/2) = T dA for small dA so friction force = mu T dA so dT = mu T dA dT/T = mu dA ln T = mu A T = c e^mu A at A = ...

**8:01 X ?**

Now where might this question come from ?

**MATH**

Yes

**math**

I tried to tell you, you must give the whole question. do you want probability of scratched CD or unscratched CD? for example 1/4 ARE Fiction but 3/4 are NON-Fiction You did not say which you wanted.

**ah - good luck**

I have never taken business economics. I hope there is someone here who has but have not run into them.

**math**

Yes, assuming the mashed potatoes are not well known to be lumpy and the heart surgeon said French fries are ok.

**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.

Pages: <<Prev | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | **21** | 22 | 23 | 24 | 25 | 26 | 27 | Next>>