# Posts by Damon

Total # Posts: 29,823

**Math**

At the same store, Peter bought 2 pairs of pants and 5 shirts for $61, and jissica bought 3 pairs of pants and 2 shirts for $64. How much does 1 pair of pants cost? ~Please explain this problem to me

**Math**

60 - 24 = 36 points needed 36/4 = 9 questions needed right so n >/= 9

**Precalculus**

first do the complex conjugates (x+7i)(x-7i) = x^2 + 49 now the first two terms x^2-8x+16 now multiply using distributivee property x^2 ( x^2-8x+16 ) +49 ( x^2-8x+16 ) add

**PHYSICS**

50 = T1 cos 30 + T2 cos 60 T1 sin 30 = T2 cos 60

**Physics**

I guess 1 MJ means 10^6 Joules???? watts * seconds = Joules so 338 watts * time in seconds = 4.8*10^6 Joules t = 4.8 *10^6 / 338

**Physics**

http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/dopp.html

**help math!**

distance home to store = d total time = 1 hr d = 15 t d = 10(1-t) 15 t = 10 -10 t 25 t = 10 t = 10/25 d = 15* 10/25 d = 6 miles each waay total distance = 12 miles total time = 1 hour so average speed = 12 miles per hour BY THE way AXENMO averaging the speeds them selves is ...

**help with math!**

Very much like your other problem total distance = 15(40/60) + 10(20/60) = 10+10/3 = 40/3 miles in one hour = 13.3 miles per hour

**Math**

2/1.5 = 4/3 = 16/12 1.5/2 = 3/4 =9/12 1/3 = 4/12 No constant ratio in this whole scheme so no proportionality

**physics**

moments around pivot point at 20cm m(50-20)+50(30-20)=100(20-10) 3m + 50 = 100

**physics question**

m Ac = m v^2/r = 1700 * 400 / 55 Newtons

**PHYSICS**

8.88*9.81/.0454 = 1919 N/m if you really want kilo Newtons then 1.918 kN/m

**physics**

F = m v^2/r = m omega^2 r m = 20 v = 2 pi r/6.2 = 2 pi(1.8/6.2) r = 6.2 so solve for F, the mass times centripetal a mu = Ac/9.81 = (v^2/r) /9.81

**Mathematics**

(x-1) is the altitude I assume? if so (x-1)(1/2)(x+6+3x-4) = 119 (x-1)(4x+2) = 119*2 (x-1)(2x+1) = 119 2x^2 - x - 120 = 0 (x-8)(2x+15) x = 8

**whoops, misread**

Just TEN cars 10 log 10 = 10 so ten dB for 10 times intensity so 90 db each

**NO!!!!!**

change in dB = 10 log base ten (intensity ratio) = 10 log (100) = 10*2 = 20 db for ten times intensity so 80 dB each

**Algebra error repair**

2 g t + g = 40 t (40 -2g)t = g t = g/(40-2g)

**Physic**

t is time for ball 2 t+1 is time for ball 1 h = (1/2)g (t+1)^2 h = 20 t + (1/2)gt^2 so g(t+1)^2 = 40 t + gt^2 g(t^2 + 2 t + 1) = 40 t + g t^2 2 gt + g = 40 t t = g (2t+1)/40 t+1 = answer to 1) etc

**Math 120**

first one: 4/10 second one 3/9 third one 2/8 fourth one 1/7 now multiply :) ------------------------ ow all good first one 6/10 second one 5/9 etc

**Physics**

energy at top = (1/2)m v^2 + m g h = 75 (25/2+9.81*7) energy at bottom the same but h = 0 so 75 (V^2/2) = 75 (25/2+9.81*7) (note-- the mass does not matter) Now if he comes up to the same height on the other side he will be moving up at 5 m/s (1/2)(25) = 9.81 h where h is the ...

**wrong I think**

V = Vi (0.82)^t not times t .75 = .82^t log .75 = t log .82 t = log.75 / log.82 = 1.45 years

**angular accleration**

Hey, I did one for you. Now you try.

**angular accleration**

150 - 120 = 30 rpm 30 *2pi/60 = pi radians/second = change in angular velocity pi/30 = angular acceleration in radians/second

**MATH: Check my answers | HELP ASAP!!**

12*23 = 276 yes

**US History UGGGH**

I am inclined to agree with you on d.

**Maths**

say tthey startedd east east distance = 150 + 120 cos 45 north distance = 120 sin 45 hypotenuse = sqrt[(150+120cos45)^2+(120sin 45)^2]

**Maths**

LOL try a+b+c = 3 try a = 1 b+c = 2 let b= 1 and c = 1 (1+1+1+1)(1+1+1+1) = 4*4 = 16

**Physics**

8.99*10^9[-32*10^-12 / 5.76*10^-4] = -49.9 *10^1 = -500 agree force is attractive (opposite signs). I guess you could call that negative.

**Physics**

v^2/R = 100/80

**science, maths**

the work done on a test charge q moving in an electric field is the force q*E times the distance moved IN THE DIRECTION of the force. The only direction that has NO component of force in the direction of motion is in the direction perpendicular to the force. The force is in ...

**math**

small = 47/22 - 11/22 = 36/22 = 18/11 large = small + 40/11

**modern physics**

I looked through this list of questions. They are cookbook questions and the recipes are in the student's text. for example if we know a half life in seconds and it is exponential decay then amount = original amount *e^-kt if amount/original amount = 1/2 then 1/2 = e^-kT ...

**math question**

.75*2400 = 1800 = value after first year .25*1800 = 450

**American Government**

Did Washington have a Health and Human Services department? A housing and Urban Development? .....

**maths period help**

when theta/4 = 2 pi you have gone once around the circle theta/4 = 2 pi theta = 8 pi

**physics 1**

Well, whatever we do we will be wrong because when you have a ship in water there is an effect called usually "added mass" due to having to accelerate water around the ship when you accelerate the ship. However your book did not know that so: F = m a -8*10^4 = 3.6*10...

**Physics**

The same as the original momentum.

**Physics**

sqrt(450^2+725^2) Hey - you are asking the same question over and over with different numbers.

**math**

864 - 702 = 162 You calculated how much she paid for the good deal but you were asked how much she SAVED.

**math**

75% off is 25% = 1/4 full price = 200*4 * 1.08 deal price = (200*3 + 50) * 1.08 subtract

**Chemistry**

17600 = 4.184 * 350 (T-24.1)

**Math**

70 (1- 1/14) = 70 (13/14)

**sorry, misleading word**

gain per period = 1+r not per year gain per year = (1+r)^n gain per 6 years = (1+r)^6n

**math**

r = .035/n where n = times per year yearly gain = 1+r final amount = 2750 * (1+r)^6n so for example for 1000 times per year: r = .035/1000 = .000035 1+r = 1.000035 and amount = 2750 *(1.000035)^6000 = $ 3392.60

**incomplete statement**

I assume it is sticking out horizontal from wall. I assume the weight is in the middle I assume the string is vertical, if not divide T by cos angle where angle is angle of string from vertical. moments about hinge 100 (1/2) -T (1) = 0 T = 50 N then you also need 50 N up at ...

**physics**

I mean I often answer physics questions here and you saved me a lot of work :)

**physics**

That was heroic Elsa tony !

**sir damon steve damon damon help maths**

integral T dt = .1 t^3 + 2 t^2 + 10 t at t = 12 = .1(1728) + 2(144) + 120 at t = 9 = .1(729) + 2(81) + 90 subtract value at 9 from value at 12 divide by (12-9)

**Algebra**

If 2x+1 = 5 then x = 4/2

**Social Studies 6th grade**

The smallpox story was standard until very recently.

**Social Studies 6th grade**

It is traditionally believed that smallpox was the killer, but recently that hypothesis has been challenged and cycles of drought and rainfall leading to waves of rodents carrying indigenous fevers might be the culprit. See: http://blogs.plos.org/publichealth/2013/07/30/guest-...

**calculus**

integral of F dx assuming that F is in exactly the direction of motion 7 integral dx/x^2 at 19 - at 1 -7 (1/x) at 19 - at 1 7/1 - 7/19 = 12/19

**Social Studies**

If you see a solution to the problem in that paragraph, you are magical. I have no doubt about the different religions, but by the way wonder about the claim of ethnic differences. What does that mean?

**Science**

1. right 2. right 3. WRONG X has greater energy/freequency, just below Gamma

**History**

...and this survivor of the Pearl Harbor attack is not happy either.

**History**

Of course it is correct! The others are just plain crazy. Admiral Mitscher is upset with you.

**Physics**

sorry 3/2 the way it is phrased

**Physics**

rotational: omega = v/r = angular velocity I = (2/3) m r^2 Ke = (1/2)I omega^2 = (1/2)m (2/3)mr^2 v^2/r^2 = (1/2)m (2/3)v^2 but translational Ke = (1/2) m v^2 so 2/3

**chemistry**

Do you have Google where you live?

**Chemistry**

delta U = heat in - work out delta U = Q - W in physics HOWEVER chem texts sometimes use delta U = Q + W with W = work IN so maybe that is what you have here. in that case if delta U is - then Q < -W heat in less than work out which is c)

**Math**

LOL :)

**Math**

-4 (4) < 4x < 5(4) -16 < 4x < 20 -16 + 5 < 4x+5 < 20 + 5 -11 < 4x+5 < 25

**Math**

proof read perhaps 30% of x is 87 ? .3 x = 87 x = 87/.3 = 870/3

**Chemistry**

heat comes out when you convert water to ice

**physics!**

Ac = v^2/R = omega^2 R well circumference = 2 pi R = 22.6 pi meters does that circumference in 16.6 seconds so v = 22.6 pi/16.6 meters/second so Ac = (22 pi/16.6)^2 / 11.3 the mass has nothing to do with it unless you want the tension in a string :)

**Physics**

leg of right triangle 5^2 + x^2 = 169 x^2 = 144 x = 12 this is a 5, 12, 13 right triangle

**Accelerated Math**

c = 7 s c depends on s

**math**

0.80 p = 65 p = 65/.8 = 650/8

**math**

(568+102-57) * 1.10 =

**All subjects**

EXPRESS all lengths in METERS, not cm for example I do not believe your well is radius of 3 cm Volume of well = V = pi r^2 * 21 Q = flow rate Q = width * depth * 2 m/s V = flow rate Q * time t

**Chemistry**

humm 2H2 + O2 ---> 2H2O O is 16 g/mol so O2 is 32 grams/mol so we have 384/32 = 12 mols of O2 That will yield 2*12 = 24 mols of H2O a mol of H2O is 2+16 = 18 grams/mol so 24 mols = 24*18 = 432 grams water

**calculus**

F = k x 4 = k (.1) k = 40 pounds/foot Energy = Work = (1/2) k x^2 = (1/2)(40)(.6)^2 foot pounds to get that with calculus work in = F dx = k x dx = k x^2/2 + constant if W = 0 when x = 0 than the constant is 0 so W = (1/2) k x^2

**Physics**

the wavelength is determined by the difference between high and low energy levels in the material emitting the photons.

**Hope someone know this Math**

The original reply that the terms are irrational is rational.

**Math - Calculus**

only if it is horizontal there. http://www.google.com/search?q=critical+point+of+function&ie=utf-8&oe=utf-8

**Math**

but I think you wanted GREEN (9/14) (70) = 45

**Math**

now try that 25/70 = ? 5/14 whew !!!

**Math**

another way multiply both sidees of this equation by the least common multiple of 14 and 70 I think 140 is close enough 140(5/14) = 140(x/70) 10 * 5 = 2 * x 5 * 5 = x 25 = x

**math**

yes

**math**

The area is four times the original and no I am retired.

**math**

double the scale of a two dimensional figure and area is multiplied by 2^2 = 4 times eg rectangle 2 x * 2 y = 2^2 x y = 4 x y

**Math**

multiply both sides by 100x 5 x = 300 x = 60 now try that 3/60 = 30/600 = 5/100 yes

**Math**

that makes NO SENSE. You have no unknown there and it is wrong anyway 5/100 = 0.05 30/6 = 5 they are not the same you must have an x somewhere

**Math**

your second problem statement makes no sense.

**Math**

multiply both sides by 100 x 100 x (3/100) = 100 x (30/x) 3 x = 3,000 x = 1,000 or simply multiply the left side by 10/10 30/1,000 = 30/x :)

**PE**

That is correct if your order is from simple to complex. The original question was from complex to simple

**PE**

most complex ---> simplest systems -> organs->tissues->cells

**PE**

ah, most complex is supposed to be first I think.

**math**

the area of a trapezoid is the average length of top and bottom (L1+L2)/2 times the height http://www.google.com/search?q=area+of+trapezoid&ie=utf-8&oe=utf-8

**Physics**

q * E charge times electrical field strength proportional to charge

**Physics**

k Q1 Q2 / d^2 charge and distance

**Physics**

no

**Algebra2**

(x-0)^2 = 4a(y-0) a = distance vertex to focus or to directrix if a is +, parabola holds water here directrix is below vertex, so a is +5 x^2 = 20 y

**Chemistry**

.055*.5 = .0275 mols of H2CO3 You need half as many mols of Fe2SiO4 .5*.0275 = .01375 mols now add up gram molecular mass of Fe+Fe+Si+16+16+16+16 to get grams/mol and multiply by .01375 to get grams

**Physics**

yes

**Physics**

http://en.wikipedia.org/wiki/Interference_(wave_propagation) note: [2A] cos (kx- wt) cos(phase angle/2)

**math**

By up I suppose you mean up in y because you have no z coordinate. Just increase all the y locations by 3 and leave the x coordinates the same. eg: S(4,4)

**no idea**

do not see picture

**physics**

Spaceship 2 has it all:) 300*0 = 0 300*4 = 1,200 kg m/s

**physics, vectors**

If a unit vector in the x or east direction is i, the y direction or north is j, and the z direction or up is k, then: momentum vector=12,000 i + 0 j + 0 k magnitude = sqrt (12,000^2+0^2+0^2) =12,000 kg m/s