Saturday
February 6, 2016

Posts by Damon

Total # Posts: 25,133

technoligy
Think about a parabola and a cubic y = a x^2 + b x + c and y = a x^3 + b x^2 + c x + d parabola changes direction once, either sheds water or holds it, two roots cubic changes direction twice, three roots - s shaped
November 22, 2015

Physics
at surface pressure = 1 atm gains 4 atm so at 5 atm at 40 m pressure is 1/5 so volume is 5 times at surface
November 22, 2015

Math
2/3 cup / (1/4 recipe) multiply top and bottom by 4 = (8/3) cup/recipe or 2 2/3
November 22, 2015

english
Is Antiquities not a book title? Are titles not proper nouns? Same about Pan why the comma after after foils and none after doilies ? Are you not quoting someone? "Won't you ...""
November 22, 2015

math
L w h = 168 but L w = 28 so h = 168/28 =================== (1/2) (2.5)(2)(4) = Volume
November 22, 2015

math
80% cleared something so 80 = 75 + 60 - cleared both so cleared both = 75 + 60 - 80 = 55 (that is the "intersection" of the cleared sets) That meand that 75 - 55 = 20% cleared only A and 60-55 = 5% cleared only B so 25% cleared only A or B but not both
November 22, 2015

what is the variable ?
e^(-t/r) dt or e^(-t/r) dr ?
November 22, 2015

math
r = red r/8 = green r + r/8 = 36 (9/8)r = 36 r/8 = 4 r = 32 =========== 32 + 32/8 32 + 4 36 sure enough
November 22, 2015

Science
mass of block with bullet = .5 + .050 = .55 kg momentum of block with bullet = .55*4 = 2.2 kg m/s so momentum of bullet before it hits = 2.2 so .050 Vbullet = 2.2 Vbullet = 44m/s but before we shot, the momentum was zero 0 = mass pistol * 0 + mass bullet * 0 no external ...
November 21, 2015

Physics
circumference = 2 pi r = 2 pi (640,0000) time = 80 d * 24 h/d * 3600 seconds/h so speed = circumference / time
November 21, 2015

as links so you can click (I hope)
http://en.wikipedia.org/wiki/Binomial_coefficient as links http://en.wikipedia.org/wiki/Factorial
November 20, 2015

factorials
https://en.wikipedia.org/wiki/Factorial
November 20, 2015

binomial coefficient
https://en.wikipedia.org/wiki/Binomial_coefficient
November 20, 2015

College pre calc
OIC to calculate nCr use nCr = n! / [ r! (n-r)! ] unless you have Pascal's triangle or a binomial coefficient table in front of you Google binomial coefficient i! = i * (i-1) * (i-2)..... 1 when you have a division like 19!/8! you write 10! as 10 * 9 * 8! so you can cancel...
November 20, 2015

College pre calc
10C8 = 10!/ [ 8! (10-8)! ] = [ 10 * 9 ] * 8! / [ 8! * 2! ] = 90/2 = 45
November 20, 2015

Physics
The question is meaningless ignoring gravity. In fact it is hard to say ignoring air drag as well. Because the body would presumably reach constant terminal velocity where air drag up exactly balances gravitational force down.
November 20, 2015

Math
(2x+11y) (w) = 8 x + 44 y w = (8 x + 44 y) / (2 x + 11 y) = 4 (2 x + 11 y) / (2 x + 11 y) = 4
November 20, 2015

Math 1350
x/7 = A 6/7 = (7 A + 6)/7 x/6 = B 5/6 = (6 B + 5)/6 so x = 7 A + 6 and x= 6 B + 5 7 A +6 = 6 B + 5 6 B - 7 A = 1 what multiples of 7 and 6 differe by one? 35 and 36 or 48 and 49 ? try 35 and 36 A = 5 and B = 6 x = 6 B + 5 = 41 or x = 7 A + 6 = 41 sure enough
November 20, 2015

Math 1350
12 = 2*2*3 18 = 2*3*3 lowest common multiple = 2*2*3*3 = 4*9 = 36 11/12 = 33/36 1/18 = 2/36 so 35/36 is used and 1/36 remains open fields
November 20, 2015

Algebra 2
Maybe a rectangle? 2L + 2 W =400 so L + w = 200 so L =200-w L w = 9100 (200-w) w = 9100 w^2 -200 w + 9100 = 0 w = [ 200 +/- sqrt (40000 - 36400)] / 2 w = [ 200 +/- 60 ] / 2 w = 130 or 70
November 20, 2015

Physics
Hey, I showed you how to do it. Mow use what I showed you.
November 20, 2015

Physics
Volume = pi R^2 L so mass = rho L pi R^2 rho = density = 1000 kg/m^3 * SG because density of water is 1000 kg/m^3 so mass = 1000 SG L pi R^2 if mass and R are the same then L * SG= maas /(1000 pi R^2) = constant so Ln * SGn = L1 * SG1
November 20, 2015

Algebra
(4/3)^2 = 16/9 which is less than 2 -70/110 vs -63/100 have to actually do it :( -.636 is less than -.630 (to the left of it on number line) -22/25 versus -80/100 is -88/100 is less than -80/100
November 20, 2015

science
Hmm, better look at globe - I think A
November 20, 2015

Physics
Energy stored = (1/2) I omega^2
November 20, 2015

Physics
then u , the horizontal component = sqrt (final speed^2 - Vf^2)
November 19, 2015

Physics
If you need components you need to do the vertical problem. It fell from 8 meters up Call vertical component at ground Vf fall from 8 meters (1/2) m Vf^2 = m g (8) Vf = sqrt (16 g)
November 19, 2015

Physics
I did both horizontal and vertical components Bob (not really needed of course)
November 19, 2015

Do it Bob's way :)
The way Bob Pursley did it is much easier. You do not need components at all, just kinetic energy gained by falling 2 meters total.
November 19, 2015

Physics
If you want to do that first part with energy we do NOT know Vi BUT we do know that the thing goes up 8-2 = 6 meters before gravity stops it Vi = sqrt (2 g * 6 meters)
November 19, 2015

Physics
I gave you components you have vertical component at ground = Vf and find horizontal component the way I did Watch out Bob, 15 m/s is not the vertical component but the total speed
November 19, 2015

Physics
Now you need horizontal speed. That is easy You have Vi = 10.8 and Vi^2 + u^2 = 15^2 so u = sqrt (225 - 117) and then finally speed out of cannon = sqrt (Vi^ + u^2)
November 19, 2015

Physics
Now do the second half of the vertical problem I did not notice you said use energy so I will now Call vertical component at ground Vf fall from 8 meters (1/2) m Vf^2 = m g (8) Vf = sqrt (16 g)
November 19, 2015

Physics
The mass is only included in the problem statement to confuse the student. First do the vertical problem. It had initial vertical velocity component Vi and height 2 meters It went up to 8 meters and then stopped and fell. How long to rise from 2 m to 8 m? v = Vi - 9.81 t at ...
November 19, 2015

math
9/15 = 3/5 divide top and bottom by 3 3/10 = 3/10 prime number in numerator, no luck 6/10 = 3/5 divide top and bottom by 2
November 19, 2015

Physics
I omega = constant angular momentum I/2 (2 omega) = I omega twice 4 = 8 radians/second
November 19, 2015

Math
12 miles/3 hours = 4 miles/hour
November 19, 2015

math
12 - 1 = 11
November 19, 2015

school math 3rd grader
Meg went into the store with $8.64 in her pocket She spent $4.89 on toys. How much did she have left to buy candy?
November 18, 2015

school math 3rd grader
Decimals in Grade 3 addition? 3.75 4.89 -------- 8.64 or perhaps regrouping it into powers of ten 3*1 + 7*.1 + 5*.01 4*1 + 8*.1 + 9*.01 --------------------- 7*1 + 15*.1 + 14 * .01 which is 7*1 + 16*.1 + 4 *.01 which is 8*1 + 6*.1 + 4*.01 which is 8.64
November 18, 2015

Fluid mechanics, Hydraulics
The area does not determine the pressure but only the force when the pressure is known. All that matters here is the difference in altitude. B is high A is low density * g * 1.75 meters .8 * 1000 kg/meter^2 * 9.81 * 1.75 = 13,734 Newtons/m^2 or Pascals one atmosphere is about ...
November 18, 2015

physics
I do not care how far it went to the fielder. I am only interested in the vertical problem. it spent 5.5/2 seconds rising v = Vi - g t at top, v = 0 0 = Vi - 9.8 (5.5/2) so Vi = 27 m/s so if you throw up at 27 m/s, how high? two ways: energy: (1/2) m Vi^2 = m g h so h = Vi^2/(...
November 18, 2015

algebra
2.5 - 3.5 x = 8 - 4 x - 6 4 x - 3.5 x = 8 - 6 - 2.5 .5 x = -.5 x = -1
November 18, 2015

Math (Damon Please help)
You are welcome.
November 18, 2015

Math (Damon Please help)
Yes !!!! of course 8 = 2*2*2 but that does not matter right now
November 18, 2015

Mathematics
oh, you changed a number 2 (1 -sin^2) + 4 sin - 3 = 0 2 - 2 sin^2 + 4 sin - 3 = 0 -2 sin^2 + 4 sin - 1 = 0 2 sin^2 - 4 sin + 1 = 0 (2 sin -1)(2 sin-1) = 0 sin = 1/2 angle = 30 or 150 degrees
November 18, 2015

Solved earlier link
http://www.jiskha.com/display.cgi?id=1447870446
November 18, 2015

Mathematics
I already did this today 180-30 360 - 30 270 in degrees multiply degrees by pi/180 to get radians if that is what you need
November 18, 2015

Math
Juan 1 job/32.35 minutes R 1 job/21.78 minutes L 1 job/23.18 min all three work for t minutes so (1/32.35 + 1/21.78 + 1/23.18) t = 1 job ( .119966 ) t = 1 so t = 8.34 minutes
November 18, 2015

SS plz help me plzzzzzzz
The paragraph headings are blue when I click on it too :)
November 18, 2015

Math
(1/4)^2 + 2 ? I am sure you can do that !
November 18, 2015

Physics
Kinetic energy = (1/2) m v^2 = (1/2)(4)(4) = 8 joules so you need 8 Joules to stop it F = m a 5 = 4 a a = 5/4 m/s^2 = 1.25 m/s^2 5 x = 8 x = 8/5 = 1.6 meter
November 18, 2015

Physics
m = .00417 kg distance = .0464 meter F * distance = work F = (1/2) m v^2 / .0464 b) easy way is if acceleration is constant then average speed = (initial + final)/2 so average speed = 506.1/2 distance = .0464 so time = .0464/253 = 1.83*10^-4 seconds = 0.000183 seconds
November 18, 2015

Physics
work done by puller person = F * 28 work done lifting weight = .47 * F * 28 = 13.16 F so 13.16 F = 47 * 9.81 * 7
November 18, 2015

math
When you get to Chemistry, remember how we did that
November 18, 2015

did something
12 for 8.40 8.40/12 = 0.7 Rs/egg 0.7 * 1.15 = .805 Rs/egg times 100 = 80.5
November 18, 2015

physics
Ke = (1/2) m v^2 = (1/2)(.020)(354)^2 = F * d = 0.45 F
November 18, 2015

Physics
distance up = 2.26 sin 25.6 work = m g h = 7159 * 2.26 sin 25.6
November 18, 2015

physics
Two are easy :) Force down = m g, does no work, no motion up or down Force up from floor = m g, also does no work The third is easy too work done by input force = +185 * 7.5 = + 1388 Joules Now the negative one, the friction force which is opposite to motion F = - mu m g = - ....
November 18, 2015

Mathematics
oh, forgot quadrant 4 360 - 30 = 330 degrees
November 18, 2015

Mathematics
2 cos^2 x - 3 sin x - 3 = 0 but cos^2 x = 1 - sin^2 x so 2 (1 -sin^2 x) - 3 sin 3 - 3 = 0 2 - 2 sin^2 x - 3 sin x - 3 = 0 2 sin^2 x + 3 sin x + 1 = 0 (2 sin x + 1)(sin x + 1) = 0 sin x = -1/2 or sin x = -1 x = 210 degrees or x = 270 degrees now do the second half :)
November 18, 2015

Math NEED HELP NOW! SO CONFUSED! :'(
3 would be 3 x^2 3) 3x^2y, 9x^2 3 * x * x * y and 3 * 3 * x * x 3*x*x is common to both
November 18, 2015

Math NEED HELP NOW! SO CONFUSED! :'(
5. 3 * c * d * d * d *d 4 * 3 * c * c * c * d 2 * 3 * c * c * d * d they all have 3 they all have c they all have d so 3 c d
November 18, 2015

Math NEED HELP NOW! SO CONFUSED! :'(
Now you try
November 18, 2015

Math NEED HELP NOW! SO CONFUSED! :'(
17 is a prime number. You can do nothing here
November 18, 2015

Math NEED HELP NOW! SO CONFUSED! :'(
http://www.jiskha.com/display.cgi?id=1447869016
November 18, 2015

Pre-Algebra(please help ASAP!!!!!)
greatest common factor? well, let's factor them for fun 36 = 6*6 = 2*2*3*3 81 = 9*9 = 3*3*3*3 27 = 3*3*3 well the biggest thing common to all of them is 3*3 which is 9
November 18, 2015

Geometry
around the outside turn right 6 times 360/6 = 60 so inside is 180-60 = 120
November 18, 2015

Algebra
18 </= T </= 28
November 18, 2015

I see no attempt to checkH
Maybe you just want me to try to do it? I already know how.
November 18, 2015

8th grade Pre Algebra
you need 3 ns and 4 ts n^3 t^4
November 18, 2015

Algebra 2
y^2 = 16 - x^2 y = +/- sqrt(16-x^2) There must be one and ONLY ONE value of y for every value of x However we have TWO So you are right, y is not a function of x In fact this is a circle with center at the origin and radius 4 The domain is x = -4 to x = +4 The range is y = -4 ...
November 18, 2015

Physics
all you need to know is the speed of a hunk of water headed up. Q = flow rate = hose area * v Q = pi (.0159)^2 /4 * 2.4 Q = .000477 m^3/second but Q = flow rate = nozzle area * speed Vi = initial speed up .000477 m/s = pi r^2 Vi .000477 = pi (.0064)^2 Vi Vi = 3.7 m/s Now we ...
November 18, 2015

directions
east 80 + 100 + 120 = 300 north 20 + 60 = 80 sqrt (300^2 + 80^2) = 310
November 18, 2015

math
1 3/4 = 4/4 + 3/4 = 7/4 3 * 7/4 = 21/4 = 5 1/4 or maybe 1 3/4 = (2 - 1/4) 3 ( 2 - 1/4) = 6 - 3/4 which is 5 1/4
November 17, 2015

Science
The one with the two metals on the right :)
November 17, 2015

math
http://davidmlane.com/hyperstat/z_table.html
November 17, 2015

Pre-Algebra
No You multiply both sides by 4.9 a/4.9 = 8.33 (a/4.9) * (4.9) = 8.33 * 4.9 a = 8.33 * 4.9
November 17, 2015

Math
shadow/height = constant at this time of day 10/6 = 150/x
November 17, 2015

Maths
I would be inclined to do it in meters though r = 0.1 meter
November 17, 2015

Calculus
Thanks, hope so :)
November 17, 2015

Calculus
w = (5 x^2 + y^2 - 4 z^2)^.5 dw/dx = (5 x)/(5 x^2 + y^2 - 4 z^2)^.5 dw/dy = y/(5 x^2 + y^2 - 4 z^2)^.5 dw/dz = -4/(5 x^2 + y^2 - 4 z^2)^.5 now just plug in 2, -4, 6
November 17, 2015

Calculus
do this just like the one above for example df/dx = 3 x^2 + 2 y^3 df/dy = 6 x y^2 - 9 d/dx (df/dx) = 6 x etc
November 17, 2015

Polynomial
I will do one, then you try x (x^2 - 3 x - 4) = 0 x (x-4)(x+1) = 0 so x = 0 , 4 , -1
November 17, 2015

physics
Lift == k v^2 Lift at 250 km/h = 400,000 g 100 * 140 = 14,000 kg so lift needed = (400,000 -14,000) g Newtons = 386 g Newtons 250^2/400,000 g = v^2 / 386,000 g v^2 = 250^2 (386/400) v = 250 sqrt (.965) v = 245.6 km/h
November 17, 2015

math
change in y /change in x = 5 y = 5 x + 3
November 16, 2015

Algebra
sue = s Jill = 3 s Jane = (1/4) s so s + 3 s + s/4 = 36 4 s + s/4 = 36 16 s + s = 144 17 s = 144 s = 144/17 Jill = 3 s = 432/17 Jane = s/4 = 36/17
November 16, 2015

Social Studies
General P.G.T. Beauregard attacked Fort Sumter. I suspect he gets the credit.
November 16, 2015

Quick English check- ms sue
I think: 4 is replicate 10 is contend
November 16, 2015

algebra
There is no unique answer. You have defined a straight line. y = (3/4) x - 10/4 slope is .25 hits y axis at -2.5
November 16, 2015

Geography
There are so many :(
November 16, 2015

Geography
Well, that term was used to describe people who fled Vietnam by boat after the war there. However it could apply to people who fled Cuba or fled Syria or fled ........
November 16, 2015

Math
red + brown = 24 total = 24+18 = 42 so 24/42
November 16, 2015

Math
9 * 2 = 27 BUT 5 * 5 = 25 !!!!! but still not enough :)
November 16, 2015

math
L^2 10.5^2 = 110.25 in^2
November 16, 2015

PHYSICS
5.7 * 1025 = 5842.5 kg of water displaced by ice submerged mass of ice = 5.7 * 917 = 5226.9 kg mass additional to submerge = 5842.5-5226.0 = 615.6 kg mass of maximum bear then weight in Newtons = 615.6 *9.81 N
November 16, 2015

Calculus
wait a minute that ignored the up parts 32 + 16 + 16 + 8 + 8 + 4 + 4 ..... 32 + 2 ( 16)/.5 = 32 + 64 = 96
November 16, 2015

Calculus
infinite geometric series a1 = 32 r = .5 sum = a1 (1 - r^n) / (1-r) = 32 (1 - .5^oo) /(1 - .5) =32 /.5 = 64
November 16, 2015

Physics
The real question is how long does it take anything to fall to the floor from a 2.1 meter table h = (1/2) g t^2 2.1 = 4.9 t^2 solve for t then 16 = u * t
November 16, 2015

PHYSICS
R1^2/R2^2 = 2180/73.6 so sqrt (2180/73.6)
November 16, 2015

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