Sunday

April 20, 2014

April 20, 2014

Total # Posts: 16,198

**Science**

Yes

**Science**

Google "photosynthesis".

**Edu 656-Education My take on it**

Well, let me see. I read "The Sea and Civilization" which reminded me to go south from Crete, then east along the North African coast, drop my wares at Alexandria, sail east to the Levant, North along the Levant to Asia Minor, west along the coast of Asia Minor to ab...

**English help explaining**

It is gibberish but I think the author is trying to say that the immigrant is isolated from the new community and remembers the old life as he/she is learning to live in the new place and its differences from the former life.

**Math**

x^2 + 8 x + 1 = -3y x^2 + 8 x = -3y - 1 x^2 + 8 x + 16 = -3 y + 15 (x+4)^2 = -3 (y-5) vertex at (-4,5) symmetric about x = -4 y = 0 when (x+4)^2 = 15 x+4 = +/- sqrt 15 x = -4 +/- sqrt 15 are the zeros

**Math**

As it is stated it is impossible to solve because you can not start at both 20 and at 1.25 feet :)

**Math**

Where did you find this problem? at t = 0, the senior has to be at 20 feet I think. however your function shows her at 1.25 feet at t = 0 That is not right. Moreover in real life h = Hi + Vi t -(1/2) g t^2 in the feet/seconds system -(1/2) g t^2 is about -16 t^2 NOT -t^2

**math**

r = 2 is positive root from http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php so w = 4

**math**

width = 2 r length of rectangle = 2 r + 2.25 area of semicircle = (1/2) pi r^2 area of rectangle = 2r(2r+2.25) total area of free throw section = (pi/2) r^2 + 4 r^2 + 4.5 r Pi/2 + 4 = 5.57 5.57 r^2 + 4.5 r = 31.28 5.57 r^2 + 4.5 r - 31.28 = 0 use quadratic equation to solve or...

**math**

V = pi r^2 h = pi (x+5)^2 x = pi (x^2 +10 x +25)x = pi (x^3 + 10 x^2 + 25 x = 1920 ???? if so then x^3 + 10 x^2 + 25 x - 611.15 = 0 find roots: http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php Only real root is at x = 5.52 then r = 10.5...

**Math**

if k+1 = 0 , then the product is 0 so k+1 = 0 k = -1 first answer if 4k+5 = 0 then product = 0 so 4k = -5 k = -5/4 second answer

**Physics**

speed up = 1.2 - .5 = .7 speed down = 1.2 + .5 = 1.7 time up = 1000/.7 seconds time down = 1000/1.7 seconds add those times in still water 2000/1.2 seconds

**Math**

I assume D x a means D a I know nothing about medicine but a) at t = 0, e^0 = 1 so C(0) = something(1-1) = 0 It has not had time to be absorbed after a long time, both e^-bt and e^-at approach zero so the concentration approaches zero. At first assuming a is much bigger than b...

**Physics**

ultraviolet is not visible for humans.

**Physics**

http://www.jiskha.com/display.cgi?id=1392230927

**Science ( Need help really bad Please!)**

F = m g or Weight = mass * acceleration of gravity m is mass, sometimes in kilograms. It is the same everywhere and depends only on which proton and neurons are there and how many. g is the acceleration of gravity. On earth it is about 9.81 meters/second^2 On the moon for exam...

**Astronomy**

See below about precession of the equinoxes. http://www.astro.com/astrology/in_praezession_e.htm

**Astronomy**

Leo

**science**

The water exerts a force up on your hand equal to the weight of water displaced. Therefore an equal and opposite force is down on the scale. Ultimately that force comes from your arm pushing the finger down into the water. In the air there will be no effect because you are not...

**physics**

a = F/m = 890/265 d = 0 + 0 + (1/2) a t^2 3 = (1/2)(890/265) t^2 solve for t v = 0 + a t v = (890/265) t

**physics**

C = Q/V 30 * 10^-12 = Q/3 Q = 90 * 10^-12 coulombs

**maths**

lcd = 3*3*5 = 45 8/45

**Algebra 2**

I do not know a better way than to say the terms are 2n/(n+2)

**Math**

(12in/36 hr)* (24*7 hr/wk) = 56 in/wk

**math**

use denominator of 36 5/6(6/6) + 3/4(9/9) = 1/18(2/2)- 6c - 2/3(12/12) + 7c + 1/9(4/4) 30/36 +27/36 =2/36 -6c -24/36 +7c +4/36 75/36 = 1 c

**Math**

15 - .75 n = 13 - .5 n .25 n = 2 n = 8

**Physics**

weight = mass * g = 9.81 m

**Physics**

gravity on earth g = 9.81 m/s^2

**Physics**

You are welcome :)

**Physics**

weight = m g = 1*9.81 = 9.81 N max friction force = .3*9.81 = 2.94 N 2.94 = k x = 29 x x = .101 meter = 10.1 cm

**physics**

P = V*i = 4.04*10^6 * 23.4 * 10^-3 94.5 * 10^3 = 94,500 watts

**PHYSICS**

By the way, I answered your roller question problem long ago.

**PHYSICS**

energy stored in LH spring at max = (1/2)kx^2 = (1/2)130(.16)^2 same amount will be stored in the RH spring when it is compressed all the way (1/2)130(.16)^2 = (1/2)280 x^2 x^2 = (130/280).16^2 x = .11 meter = 11 cm part b (1/2)k x^2 = (1/2)m v^2 130 * .16^2 = .2 v^2 v = 4..08...

**Intermediate Algebra**

F(t) = 600 - 20 t for t </= 30

**PHYSICS**

http://www.jiskha.com/display.cgi?id=1392238771

**physics**

it starts at h = 5 it ends at h = 1.5 it fell 3.5 meters

**MATH**

You are welcome :) be sure you want mm^2, usually that would be converted to cm^2 or m^2

**MATH**

Oh well :(

**MATH**

to square 21: (20+1)(20+1) = 400 + 40 + 1 = 441

**MATH**

radius = 42.0/2 = 21.0 A = pi r^2 = 3.14159 * 21 * 21 round answer to nearest tenth

**physics**

Do the whole vertical problem first Vi = 55.2 sin 54 v = Vi - 9.81 t at top v = 0 so time to top = (55.2/9.81) sin 54 height at top = 208 + Vi t - 4.9 t^2 do that calculation now you have t at top and height at top now it falls from height H at top to ground. How long does tha...

**PHYSICS part d**

The highest speed is at the lowest point. I have to assume that is H3 of 5 meters so it started with 122,625 Joules it then dropped from the 10 meter start to the 5 meter point 3, gaining 24,525 Joules so (1/2) m v^2 = 122,625 + 24,525 v^2 = 2(147150) / 500 v = 24.3 m/s

**PHYSICS part c**

H1 = 10 H3 = 5 falls 5 meters in all m g h = 500 * 9.81 * 5 = 24,525 Joules

**PHYSICS part b**

well at H2 it had total energy of 122,625. now it goes down 20 meters to 5 meters off ground so it loses m*9.81*20 joules of potential so (1/2) m v^2 = m * 9.81 *20 v= sqrt (2 * 9.81*20) by the way if something falls from height h it is handy to remember that its speed reaches...

**PHYSICS**

If H2 = 25 then the car must have potential energy of m g H2 = 500(9.81)(25) = 122,625 Joules at start so 122,625 = m g H1 + (1/2) k x^2 122,625 = 500*9.81*10 + (1/2) k x^2 (1/2) 1500 * x^2 = 73,575 so x = 9.9 meters part b later maybe

**Math**

5,000 ft/3 min = 1667 feet/minute

**S.S**

Manifest Destiny

**S.S**

Yes

**S.S**

Please Google the years they became states. By the way Minnesota and Texas and Michigan fought hard in the US Civil War. Texas was the source of much food for the Confederacy before Grant and Farragut made it hard to cross the Mississippi River with beef.

**Sports**

You are welcome :)

**Sports**

Yes

**Sports**

Ok, well Maurie hit a shuttlecock

**Sports**

alternate name for birdie ?

**Sports**

http://en.wikipedia.org/wiki/Badminton

**Sports**

yes, soccer is played with a round ball. HOWEVER tennis is played with a tennis ball. Badminton is played with a ........

**math**

x/x = 1/1 = 1 unless x = 0

**Math**

192 w /3 min = 64 words/minute 311/5 = 62.4 words/min so average those (64 + 62.4)/2 = 63.1 or about 63 words/min obviously words are not all the same length or the keys all as easy to strike or your mood the same so a perfect answer is impossible and all you can do is make a ...

**Physics Help..**

height of top of loop = .2871*2 = .5742 meters potential energy at top of loop = m g h = m(9.81)(.5742) = 5.63 m Joules (note I am not using m, does not matter elephant or mouse) potential energy at start = m(9.81)(2.61)= 25.604 m Joules so loss of potential energy = 25.604m -...

**Physics**

angular momentum around pivot is the same before and after before angular momentum = m v r = .7*4*1.2 = 3.36 kg m^2/s after let w = omega = ang velocity about pivot angular momentum = I w I = (1/3)(3.1)(1.6^2) + .7(1.2^2) = 2.645 + 1.008 = 3.65 so I w = 3.36 3.65 w = 3.36 w = ...

**physics**

stops in .011 meter average speed during deacceleration = 7.3/2 = 3.65 m/s so time to stop = .011/3.65 = .00301 second momentum change = 9.5 * 7.3 = 69.4 kg m/s so F = d (mv)/dt = 69.4 kg m/s / .00301 s = 23012 kg m/s^2 or Newtons Note - I used Newtons original second law whic...

**Calculus-Help Please**

LOL, too easy Steve :)

**Calculus-Help Please**

nope, also continuous try y = x+a for x>0 and y = -x-a for x</=0

**Calculus-Help Please**

oh, sorry, that is continuous how about y = x for x >0 y = -x for x <0

**Calculus-Help Please**

y = x^2 ?

**maths**

I can not do much for you. just take some values of x like - 90,-60, - 45, -30, 0 , 30, 45 etc and do your graphs

**Physics**

by the way I believe this is in the ultraviolet

**Physics**

.58*10^-7 meters or 58 nm

**Physics**

http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/wien3.html plug in there

**physics**

dm = .7 (1+1.41 x^2) dx m = .7 [ x + 1.41 x^3/3] 0 to .89 = .854935 etc yes check cg = (integral x dm)/m = .7[ x + 1.41 x^3] dx /m = .7[x^2/2 + 1.41 x^4/4 ]/m 0 to .89 = .43205147/.854935 =.50536 I = integral x^2 dm = integral x^2[ .7 (1+1.41 x^2) dx] = .7 int [x^2 + 1.41 x^4 ...

**science**

refraction, diffraction, and interference can all be explained using Huygens' principle, see: http://farside.ph.utexas.edu/teaching/302l/lectures/node150.html Polarization on the other hand requires electromagnetic principles. (E cross H)

**physics**

say c = 3 * 10^8 so v = 1.5* 10^8 moving away so looks longer delta lambda/ lambda = v/c d L = 500 nm (.5) = 250 nm so 250 + 500 = 750 nm

**HELP! HELP! HELP! Physics**

Oh, perpendicular axis theorem might help: http://hyperphysics.phy-astr.gsu.edu/hbase/perpx.html

**HELP! HELP! HELP! Physics**

I tried this but got a major mess. x^2+y^2 = r^2 luckily I = integral r^2(14+9r^2)(2 pi r dr) but the limits are a serious mess and I was unable to figure it out, sorry

**Math ~CHECK MY ANSWERS~**

1) 1.3 = 13/10, so rational or 1.333333...... = 1 1/3 = 4/3 which is rational 2)agree 3) agree

**Help - physics**

gain in kinetic energy = (1/2) I omega^2 + (1/2) m v^2 omega r = v so omega = v/r gain of Ke = (1/2) (.0061) (1.129/.06)^2 + (1/2) .74(1.129)^2 loss of potential energy = .74 (9.81)(.69) if there were no friction the loss in potential energy = gain in kinetic energy. if the Ke...

**physics**

force down slope = 5*9.81* sin 30 = 5*9.81*.5 = 24.5 N

**Physics - please help me..**

Same question as the one below. Please look it up.

**please help me.. physics**

Do a Google search for " natural frequency of spring mass system" You should know it by heart.

**physics**

force = change of momentum/change of time change of momentum = -61 * 11.6 = - 708 kg m/s time: moved .69 meters at average speed of 11.6/2 so .69/5.8 = .119 second so force = -(708 kg m/s) / .119 s = 5948 kg m/s^2 or Newtons

**physics**

then on crate force of weight increased by F sin 34 90*9.81* cos 24 + 596 sin 34 = 1065 N

**physics**

oops. I did not see force had to be horizontal F up slope = F cos 30 F cos 34 = 90 * 9.81 * sin 34 F = 90*9.81 * tan 34 F = 596 N

**physics**

90*9.81 * sin 34 90*9.81 * cos 34

**Calculus I**

You mean on this circle find vertical component of velocity. 2 x dx/dx + 2 y dy/dx = 0 y dy/dx = -x y dy/dx * dx/dt = -x * dx/dt dy/dt = -(x/y) dx/dt here x = 3 then y = +4 or -4 if y is +, dy/dt is + for -dx/dt if y is -, dy/dt is - for -dx/dt so dy/dt = -(3/4)(-8) = 6 in fir...

**physics**

a) d = 60(25.7*8.82+29.6*4.09+7.14*4.09) b) speed = d/[ 60(25.7+29.67.14) ]

**physics**

F = m g dF/dg = m dF = m dg percent error in F =100 dF/F = 100 m dg/(m g) = 100 dg/g

**physics**

F = m a double m, half a

**science- physics**

phase inversion

**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.

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