Friday
April 18, 2014

Posts by Damon


Total # Posts: 16,161

Chemistry
2.)What is the volume in liters of a kilogram of ice at 0 degrees Celsius? given 0.9167 g/cm3 at 0 °C which is 1.09 cm^2/g (1.09 cm^3/g)(1 L/1000 cm^3)(1000 g/kg) = 1.09 L/kg by the way : "a pint is a pound the world around" :) (VERY approximate) a pint is about ...

Chemistry
number 1 requires the gas law in one way or another at STP a mole of gas occupies 22.4 liters as a check STP is 273 K we are at 293 K I guess we are at one atm, it does not say V = 5 liters P = 1 atm T = 293 R = 0.0821 liter·atm/mol·K PV = n R T n = PV/RT = 1 * 5...

Chemistry
Great, good luck !

Chemistry
well you can do it in what I think are much more difficult ways Like say I need to go from km to cm well a km is 1000 meters and a meter is 100 cm so a km is 100,000 cm so multiply your 72 km/h by 100,000 to get 7,200,000 cm/h now deal with the hours 1 hour = 60 min and each m...

Chemistry
by the way, I use it so much that I remember 3600 s/h but (60 min/h)(60 s/min) min cancels and I have (3600 s/h)

Chemistry
if something is the same top and bottom, I call it one. for example 100 cm / 1 meter = 1 in my world, but the units change without changing the value so 72 km /h (1000 m/1km)(100 cm/m)(1h/3600s) km cancels h cancels m cancels and I am left with cm/s now do the calculation 2000...

Physics
Conservation of Momentum does not have exceptions. There are no external forces on this system. Its momentum does not change. Period. A

physics
F = m Ac = m v^2/r also F = mu m g so mu g = v^2/r mu = v^2 /(g r) in other words the ratio of centripetal acceleration to g static, tires not slipping A and C. You have a typo. They are the same

probability
Huh? if the probability of a toss being heads is .5 then it is .5 no matter what happened earlier.

math
there is one and only one value of y for each value of x so it is a function and it also is a relation between x and y

math
you do not pay fifteen cents for the first .1 mile. It is included in the 72 cents. However if it is 15 cents for 1/10 mile, then it is 1.50 per mile and I think that .15(6-.1).1 should really be .15(6-.1)/.1 anyway whoever wrote that then did the calculation correctly .72 + 1...

Science - Please Help!
You are welcome :)

Science - Please Help!
average velocity vector= displacement vector/time average speed scalar = distance traveled scalar/time a scalar only has magnitude, like miles or miles/hour a vector has BOTH speed and direction. for speed and distance you only need a speedometer and and odometer. for velocity...

Math
I thought you said x^3 + x^2 x^2 + x^2 is just 2 x^2

Math
x^2 (x+1) ????

Physics.
100 x = 50*12 x is 6 the ball went right so the person goes left It is that conservation of momentum thing.

Math ~ Check Answers ~ASAP
You are welcome :)

Math ~ Check Answers ~ASAP
but ANY even number can be divided by 2 so 2 and 4

Math ~ Check Answers ~ASAP
Now really, if in danger or in doubt, try it with a calculator. If none on your desk, use Google :)

Math ~ Check Answers ~ASAP
yes something that ends in five will not be divisible by an even number.

Math ~ Check Answers ~ASAP
A five on the right is a dead giveaway.

physics
13 degrees from vertical T = tension T cos 13 = m g so T = m g/cos 13 solve for T T sin 13 = horizontal force so T sin 13= k Q^2/(2*.17* sin 13)^2

calculus
given the student's use of strange exponent notation it might be |x^2 + 1/x^2 | http://www.wolframalpha.com/input/?i=|x^2+%2Bx^-2|

math
28/12*28/12 = 5.444 ft^2 per tile 102 * 18 = 1836 ft^2 (kitchen for a huge school I assume) 1836/5.444 = 338 tiles

Help Pleasee!!
Your team mate is skating forward. Pass the puck ahead of your forward. If you pass to where your team mate is now, it will be behind when it gets there.

physics
122 * 17.34/9.81

Physics
string tension T force up = T cos 30 = .866 T force horizontal = T sin 30 = .5 T radius = 0.30 sin 30 = 0.15 so .5 T = m v^2/r and m g = .866 T so T = 1.15 m g .5 (1.15) m (9.81) = m v^2/.15 v^2 = .846 v = .92 m/s

Physics
P V = n R T P/T = n R/V = constant here T1 = 273 + 9 T2 = 273 + 31 P1 = 76 + 400 P2 = 76 + x where x is new gage pressure P2/T2 = P1/T1 so P2 = (T2/T1) P1 x = P2 - 76

Physics
That sounds about right. One atmosphere is about 101,325 Pascals that is about 10 meters of water so about 10,000 Pascals/meter

Physics
rho g h = 1000 kg/m^3 * 9.81 m/s^2 * 1.6 m in Pascals depth does not matter, looking for difference

calculus I
T = angle up from center of sphere to intersection of cylinder and sphere r = 10 height of cylinder = 2 r sin T radius of cylinder = r cos T volume of cylinder = V = pi(r^2 cos^2 T)(2 r sin T) = 2pi r^2 (cos^2 T sin T) dV/dT = 0 for max = cos^3 T - 2 sin^2T cos T = cosT ( cos^...

math
ten periods at .057 per period 1.057^10 = 1.74 for five one year compoundings: x^5 = 1.74 5 log x = log 1.74 = .24055 log x = .04810984 10^log x = x = 1.117 or 11.7 %

Math
Harriet 1/4 nisha (1/2)(3/4) = 3/8 1/4 + 3/8 = 5/8 so 3/8 is left (3/8)n = 6 n = 16

Physics
time upward = 3.3/2 =1.65 s v = Vi - 9.81 t v = 0 at top 0 = Vi - 9.81 (1.65) Vi = 16.2 m/s h = Vi t - 4.9 t^2 h = (16.2)(1.65) - 4.9 (1.65)^2 h = 13.4 meters (good throw)

physics
I guess you mean on a planet with g = 17.34 m/s^2 ? 122 * 17.34/9.81 = 216 lb

physics
4 times 1/(.5r)^2 = 1/.25 r^2 = 4/r^2

Physics
Ke at beginning = (1/2)m (3.6)^2 loss in potential = gain in Ke = m (9.8)(8.3) Ke at end = (1/2) m v^2 = (1/2)m(3.6)^2 + m (9.8)(8.3) cancel m multiply by 2 v^2 = 3.6^2 + 2 (9.8)(8.3) solve for v

Science - Please Check This Answer
You are welcome :)

Science - Please Check This Answer
.45 m/s * 25 s = 11.25 yes

Algebra
You are welcome :)

Algebra
(x-4)^2 = k (y+4) from vertex put in some other point like (2,0) (2-4)^2 = k (4) 4 = 4 k k = 1 so I propose (x-4)^2 = y + 4 check with another given point like (5,5) Hey (5,5) should be (7,5) !!!Typo? Try (3,-3) and (5,-3)

Math
5 a + 3.5 c = 3750 a + c = 900 solve by substitution or elimination

Science
5. Water is water. H2O. Its state (ice, liquid, steam) is a physical property.

Science
3 - HEAT CONDUCTIVITY !!!!

Science
1. Which of the following is an example of matter? (1 point) leaves shadows light from the sun sound -------------------------- They want you to say "leaves". Being a physicist I might argue about that, but you better say leaves.

Math
You are welcome :)

Math
Your question essentially provides the answer with no further ado: y = -3 x + 2

Math
you need both a radius and an angle to convert from polar to x,y coordinates x = r cos theta y = r sin theta if you mean radius of 1 (unit vector then x = 1 cos pi/4 y = 1 sin pi/4 since cos pi/4 = sin pi/4 = sqrt 2 /2 x = 1 sqrt 2 /2 and y = sqrt 2 /2

U.S. History
For me it was Dec 7,1941 because my mother and I had to drive up to a friend's house in the mountains because our next door neighbor's house was hit and our neighborhood was all under fire by Japanese airplanes. I never got to go back to my school in Honolulu and we mo...

physics
F = G M m /(r^2) = m g = G M (3m)/(.25 r^2) = 12 G M m/r^2 so 12 m g = 12 * 80 * 9.81 = 9418 Newtons

Algebra
2. 3z^2 - 22 = 56 My Work: 3z^2 - 22 + 22 = 56 + 22 = (sq root of)3z^2 = (sq root of)78 = 3z/3 = 8.831760866 = 2.94 ---------------------------- 3 z^2 = 78 z^2 = 26 z = sqrt(26) = 5.10

Algebra
1. 5x^2 - 526 = -651 My Work: 5x^2 - 526 + 526 = -651 + 526 (sq root of) 5x^2 = (sq root of) -125 = 5x/5 = 11.18033989/5 = 2.24 ----------------------------- The square root of a negative number is imaginary, not a real number anyway 5 x^2 = -125 x^2 = -25 x = 5 i

us history (please help!!)
I think the Missouri Compromise did both. It established a boundary between slave and non-slave (which did not work out all that well) and it also traded admission of Maine (free) for Missouri(slave).

physics
3/ 0.3 = 10 m/s

Math
http://kc3rd.pbworks.com/f/cylinder.pdf

MATH ALGEBRA
If a cubic always try dividing by (x-1) and by (x+1) first to see if 1 or -1 is a root. In this case: x = -1 , 1/3 , -2 1/2 if all else fails: http://www.solvemymath.com/online_math_calculator/algebra_combinatorics/polynomial_calculator/polynomial_roots.php

physics
h = (1/2)(9.8)(4.59)^2

math
FSU = .99(200) so FSU = 198 I assume no FSU people left the party, like no way they would leave a party before it was over:) 198 = .98 (people left) so people left = 194 so 6 people left the party

trig
tan 31 = h/580

PHYSICS !!
momentum before = momentum just after .045 * 165 = 2.045 * Vi solve for Vi, the inital velocity fater collision Ke = (1/2)(2.045)(Vi^2) initial kinetice energy of bullet-block system That Ke will be the work done by friction: Ke = F * d = mu m g * d m cancels so so 0.4 (9.81) ...

algebra
x - 1 > 2 x > 3 or 1 - x > 2 -x > 1 x < -1 so everything to the right of x = 3 and everything to the left of x = -1

units? " or '
are you sure it is 2 feet thick and 12 feet wide? I will assume 2" and 12" that is 2 board feet per foot (2 inches thick by 1 foot wide) so 240 board feet *80 =19,200 pesos

history
I do not think so. IWW was oriented to the rank and file workers.

Physics 130
You are welcome :)

Physics 130
Is it on a level road? If so m g + 20 sin 30 15 * 9.81 + 10

chemistry
potassium oxide as far as I know

andrew jackson
Trail of tears - bad no US bank bad or good? supported slavery - bad supported democracy and liberty (for some people) - good

Science
say specific heat of water = k (does not matter here) 10 k (100 - T) = 20 k (T - 40) 1000 - 10 T = 20 T - 800 1800 = 30 T T = 60 deg C

astronomy
m g = G M m /r^2 m gmars = G (M/10)m /(.5r)^2 = GMm/r^2 * (1/10)/(.25) = (.4) G M m / r^2

chemistry
50 g * heat of vaporization of water I do not know if you are using calories or Joules or BTU. Use whatever but convert your grams properly

Math
-8x + 28 = -36 8 x = 64 x = 8

Math
(4/5) / (20/3) ??? (12/15) / (100/15) 12/100 3/25

Algebra II
x^2 + 80 x - 500 = 0 x = [ -80 +/- sqrt (6400 + 2000) ] /2 x = [ -80 +/- 91.7 ] / 2 use + result x = 5.82 so 6

Calculus Help Please!!!
f(x+h) = (x + h) + 1/(x+h) = [(x+h)^2 + 1] /(x+h) = [x^2 + 2 x h + h^2 + 1 ] / (x+h) f(x) = (x^2+1)/x f(x+h) - f(x) =[x^2+2xh+h^2+1]/(x+h) - (x^2+1)/x = x^3+2x^2h+h^2x+x -(x^2+1)(x+h) -------------------------------- x^2 + hx divide by h x^3+2x^2h+h^2x+x -(x^2+1)(x+h) --------...

Physics
If they stick together then momentum is conserved x momentum before = m v y momentum before = m v x momentum after = 2 m U cos theta y momentum after = 2 m U sin theta so 2 U cos theta = v 2 U sin theta = v or cos theta = sin theta so theta = 45 degrees cos theta = cos 45 = sq...

Physics
ritzi as in spikey sea urchins? If a collision is elastic, no kinetic energy is lost. That is what an elastic collision means.

maths
nope , four times area = pi r^2 NOT pi r (2r)^2 = 4 r^2

English
I would have said: The team members are .....

English
How about The book club likes.... or The book club like.... Seen in that perspective, the book club appears to be singular :)

English
If you can drop it out and the remaining sentence still is reasonable, it is subordinate. eg: Brett is class president. Bonnie is also studying computer science. Ann just started working here today

gibberish
Whatever font you are using is not showing up properly on my screen.

Geometry A
( y - (-4) ) / ( x -(-6) ) = 3 y+4 = 3(x+6) y = -4 + 3 x + 18 y = 3 x + 14

Math
3/Which food makes up the largest part of most American's diets? About how much of that food does the average Americaneat in 4 years? Answer: Dairy products 582 Round. 600 *. 4 4 600* 4= 2,400 -------------------- 582 * 4 = 2328 round to 2000

Math
2/ About how much fish does an average American eat in 3 years? Answer : 51 Round. 50 * 3. * 3 50* 3= 150 ----------------------------- 51 * 3 = 153 yes 150

Math
1/ About how much chocolate does an average American eat in 5 years? Answer: 13 Round 10 * 5 *5 10 * 5= 50 ------------ Round at the end 13 * 5 = 65 so I get 70

Math
Ruby and Marielle are working on a project. If ruby finishes 4/8 of the project and Marielle finishes 3/8 , how much of the project is left? Answer: 4/8_3/8= 1/8 ------------------- Well, your answer is right but for the wrong reason together they did 4/8 + 3/8 = 7/8 that leav...

Navier-Stokes eq
by the way, results are not a function of angle a (theta). All partial derivatives wrt theta are assumed zero.

Navier-Stokes eq
You have got to be kidding :) That is far too much for me to produce here but below is a link to the subject worked out: http://faculty.kfupm.edu.sa/CHE/usamah/CHE204/CHE204-HD22%20-%20Flow%20Through%20Circular%20Pipe.pdf

physics - Huh ?
I have no idea because I do not know the mass or the spring constant.

algebra
1 < x < 4

physics
(a) rotation around sticky hinge (b) rotation of screw (c) rotation around fulcrum of lever

Math
[ 7 +/- sqrt (49 - 12) ] / 2 = 3.5 +/- .5 sqrt (37) 6.541 or .459

algebra
6|6-4x| = 8 x + 4 + sign 6 (6x-4) = 8 x+4 36 x - 24 = 8 x + 4 28 x = 28 x = 1 negative sign 6(4x-6) = 8 x + 4 24x - 36 = 8 x + 4 16 x = -40 x = 5/2 so 5/2 or 1

algebra
(19.88 + 20.12) /2 = 20 middle of range can be + or - .12 from there | w - 20 | = distance from middle so | w - 20 | < .12

math
.15 x = 435 so x = 435 / .15

math
.38*560 paste that into a Google search boxsw

physics
177 (12+32)/32 = 243 I get but anyway 177 (32 -32) = 0

Physics
60 *1000/3600 =16.7 m/s average speed during stop = 8.33 m/s time to stop t = 35/8.33 = 4.2 s acceleration = - 16.7/ 4.2 = 3.98 m/s^2 m a = mu m g mu = a/g 3.98 / g = .405

physics
r^2/rearth^2 = 4/3 r = rearth *sqrt (1.33) = 1.15 rearth height = r - rearth = .15 rearth

algebra
T e = 3 u T e/3 = u

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