# Posts by Damon

Total # Posts: 29,612

**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

*March 23, 2017*

**angular accleration**

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

*March 23, 2017*

**angular accleration**

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

*March 23, 2017*

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

12*23 = 276 yes

*March 23, 2017*

**US History UGGGH**

I am inclined to agree with you on d.

*March 23, 2017*

**Maths**

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

*March 23, 2017*

**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

*March 23, 2017*

**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.

*March 23, 2017*

**Physics**

v^2/R = 100/80

*March 22, 2017*

**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 ...

*March 20, 2017*

**math**

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

*March 19, 2017*

**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 ...

*March 19, 2017*

**math question**

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

*March 19, 2017*

**American Government**

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

*March 18, 2017*

**maths period help**

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

*March 18, 2017*

**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...

*March 18, 2017*

**Physics**

The same as the original momentum.

*March 18, 2017*

**Physics**

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

*March 18, 2017*

**math**

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

*March 18, 2017*

**math**

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

*March 18, 2017*

**Chemistry**

17600 = 4.184 * 350 (T-24.1)

*March 18, 2017*

**Math**

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

*March 18, 2017*

**sorry, misleading word**

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

*March 18, 2017*

**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

*March 18, 2017*

**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 ...

*March 16, 2017*

**physics**

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

*March 16, 2017*

**physics**

That was heroic Elsa tony !

*March 16, 2017*

**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)

*March 15, 2017*

**Algebra**

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

*March 15, 2017*

**Social Studies 6th grade**

The smallpox story was standard until very recently.

*March 15, 2017*

**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-...

*March 15, 2017*

**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

*March 15, 2017*

**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?

*March 14, 2017*

**Science**

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

*March 14, 2017*

**History**

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

*March 14, 2017*

**History**

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

*March 14, 2017*

**Physics**

sorry 3/2 the way it is phrased

*March 14, 2017*

**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

*March 14, 2017*

**chemistry**

Do you have Google where you live?

*March 14, 2017*

**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)

*March 11, 2017*

**Math**

LOL :)

*March 11, 2017*

**Math**

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

*March 11, 2017*

**Math**

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

*March 11, 2017*

**Chemistry**

heat comes out when you convert water to ice

*March 11, 2017*

**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 :)

*March 11, 2017*

**Physics**

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

*March 11, 2017*

**Accelerated Math**

c = 7 s c depends on s

*March 10, 2017*

**math**

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

*March 10, 2017*

**math**

(568+102-57) * 1.10 =

*March 10, 2017*

**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

*March 10, 2017*

**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

*March 9, 2017*

**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

*March 9, 2017*

**Physics**

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

*March 9, 2017*

**Hope someone know this Math**

The original reply that the terms are irrational is rational.

*March 9, 2017*

**Math - Calculus**

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

*March 9, 2017*

**Math**

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

*March 9, 2017*

**Math**

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

*March 9, 2017*

**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

*March 9, 2017*

**math**

yes

*March 9, 2017*

**math**

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

*March 9, 2017*

**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

*March 9, 2017*

**Math**

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

*March 9, 2017*

**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

*March 9, 2017*

**Math**

your second problem statement makes no sense.

*March 9, 2017*

**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 :)

*March 9, 2017*

**PE**

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

*March 9, 2017*

**PE**

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

*March 9, 2017*

**PE**

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

*March 9, 2017*

**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

*March 9, 2017*

**Physics**

q * E charge times electrical field strength proportional to charge

*March 9, 2017*

**Physics**

k Q1 Q2 / d^2 charge and distance

*March 9, 2017*

**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

*March 8, 2017*

**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

*March 8, 2017*

**Physics**

yes

*March 8, 2017*

**Physics**

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

*March 8, 2017*

**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)

*March 8, 2017*

**no idea**

do not see picture

*March 8, 2017*

**physics**

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

*March 8, 2017*

**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

*March 8, 2017*

**Physics**

200(1.5) = .5 w w = 600 Newtons

*March 8, 2017*

**incomplete**

What is the question? a = (13.4-0)/5 m/s^2 = r*alpha v = 0 + a t = r*omega d = 0 + 0t + (1/2)(5)t^2

*March 7, 2017*

**Hot math questions**

LOL :)

*March 7, 2017*

**English**

well, "he" is a person :) Had got no business to be there After the day was done — "It's very rude of him," she said, "To come and spoil the fun." So who does she think the night belongs to?

*March 7, 2017*

**Algebra math 150**

height times average of a and b

*March 7, 2017*

**Physics**

The increase in gravitational potential energy = m g h where h is the HEIGHT change, the increase in distance from the center of the earth. Work = distance times force IN THE DIRECTION OF MOTION 200 * 4 = 800 Joules alternatively force component up slope * 4/sin 20 = 200 sin ...

*March 7, 2017*

**math 1**

when you typed 1/3x + 4 I assume you mean (1/3)x + 4 and not 1/(3x) + 4 or 1/(3x+4) y = (8-x) so (8-x) = (1/3) x + 4 24 - 3 x = x + 12 4 x = 12 x = 3

*March 6, 2017*

**Math**

a = 3 m b = 8 m c = 6b = 48 m a/c = 3 m/ 48 m = 1/16

*March 6, 2017*

**Chemistry**

(a) but when she opens the bottle the air inside is still at 1 atm so must escape out the open top--> whoosh !

*March 6, 2017*

**math 73**

.22 c + .02 m = .04(20) c + m = 20 so m = (20-c) so .22 c +.02(20-c) = .8

*March 6, 2017*

**Physics**

omega is angular velocity in radians/second omega R = 5 m/s so omega = 5/.3 = 16.7 radians/second Ke = (1/2)I omega^2

*March 6, 2017*

**Math**

You are welcome.

*March 6, 2017*

**Math**

Make a number line on a piece of paper. Draw the situation on it. Left 8 from -20 -20-8 = -28

*March 6, 2017*

**you need limits**

infinite as stated

*March 6, 2017*

**Calculus**

assuming that your answer is correct dy/dx = x^2 e^(x^3/3) but e^(x^3/3) = y-2 so dy/dx = x^2 (y-2) hummm I'll try dy/(y-1) = x^2 dx ln(y-1)= x^3/3 + c (y-1) = e^[x^3/3 + c] y-1 = e^(x^3/3) e^c y-1 = Ce^(x^3/3) y = 1 + Ce^(x^3/3) 3 = 1 + C C = 2 so y = 1 + 2e^(x^3/3)

*March 6, 2017*

**Science**

1. wrong 2. right 3. wrong 4. both mass and distance G M1M2/d^2 5. both (or they would bash each other) 6. right 7. It is near the poles that you have darkness at noon when the sun is above the other Capricorn or Cancer :) 8.Right 9. WRONG!!!! (google moon landing) 10. Wrong...

*March 6, 2017*

**English**

Nope. None of them are.

*March 6, 2017*

**Social studies**

Nope, remember that 3/5 of a person thing?

*March 6, 2017*

**Math**

(1/4) 16 = 4 lettuce (1/8) 16 = 2 punpkin (1/2) 16 = 8 red tulips 4+2+8 = 14 16-14 = 2 rows of carrots

*March 5, 2017*

**math**

recursive means you get the value from an earlier value or values. An+1 = An + 5 for example Explicit means you calculate it without reference to the former value A = 5 n for example

*March 5, 2017*