# Posts by Damon

Total # Posts: 29,830

**Physics**

F = G Mm m /Rm^2 F/m = G Mm/Rm^2 = 6.67×10-11 m^3 kg-1 s-2 * 1.08*10^16kg/[1.35*10^4]^2m^2

**history**

No way !

**Math**

4/-2 = -2 -2/-2 = 1 1/-2 = -1/2 (-1/2)/-2 = 1/4

**math**

(35/64)a = 2450 a = 2450*64 /35

**Math : ratio and proportion**

(2 L/80km) 1 km = 1/40 liter

**Geometry**

north wind due to boat speed at 16 kn west wind at 10.4 kn magnitude = sqrt(16^2+10.4^2) tan angle west of north = 10.4/16 compass angle= 360 - that angle

**Math**

5 * .0625 * 7150 = interest due total = interest due + 7150

**Mathmaybe something like:s**

7 , 8, 9 , 11 , 11, 11

**MS. SUE! World History (Absolutism and Revolution)**

The second one, Peter the Great's accomplishments,is correct. Do not forget he established a Russian port, called St. Petersburg, on the Baltic. I do not know much about Maria T. However from what little I know I would vote for #3.

**History**

http://www.britannica.com/event/United-States-presidential-election-of-1860

**History**

10 a is correct 3 see http://www.carolana.com/SC/1800s/antebellum/educational_opportunities.html 7. D is correct 8. http://www.geni.com/projects/Southern-Fire-Eaters/4715 9. Good grief, no slavery did not become legal in Massachusetts. However in theory after that decision, a ...

**Maths**

two years at 3% = .03*2 = .06 so .06 times original deposit = 72 so 72/.06 which is 1200

**Maths**

.06 v = £72

**C**

Sometimes: "Code of Ethics"

**dynamics**

v = -k ln x + c 15 = -k ln .6 + c 9 = -k ln 1.2+ c -----------------subtract 6 = -k ln(.6/1.2) etc

**Math m1**

600 = 400 a so a = 600/400 total force = 400 a + 1000 a = 1400 a

**physics**

and add heat of vaporization to steam

**Geologic Time and Earth's History Unit Te**

I would be happy to do it but need WhiteRain's text book.

**ah --**

hey - only the component in the k direction passes through your loop :)

**set maths**

You have to do this with a Venn diagram, which I can not really draw here but using that you should be able to figure it out.

**So where is your work?**

So where is your attempt to do this? There are two common ways, I do not even know which you are using since I see no work.

**History**

1. agree 2. agree 3. agree 4. agree Hey, you know the answers perfectly well :)

**Math--Matrix**

http://matrixcalc.org/en/vectors.html

**Math--Matrix**

http://www.sosmath.com/matrix/eigen1/eigen1.html

**physics**

Newtonian Gravity, objects of mass M and n: F = force of attraction on each F = G m M/r^2 if M is earth mass, call it Me and r is earth radius, call it Re then G Me/Re^2 = 9.81 m/s^2 approximately so F = 9.81 m F/m we call acceleration of gravity on earth, g = about 9.81 If ...

**physics**

now F = m g work done against gravity = integral F*dr or m g dr or m * integral g dr m 9.8 Re^2 integral dr/r^2 from Re to 4 Re integral dx/x^2 = -1/x so here 1/6,400,000 - 1/25,600,000 = 1.17 * 10^-7 so work done in Joules - m 9.8 Re^2 * 1.17* 10^-7 = m (47,040,000) Joules ...

**trick question**

Although g may be about 9.8 m/s^2 at the surface of earth, it is not 9.8 at 4 Re and therefore you can not assume it is constant g = 9.8 (Re^2/r^2)

**calculus**

yes

**backwards**

sorry P(0 broke) = 1* 1 * .82^11 P(1 broke) = C(11,1).18^1 .82^10 P(2 broke) =C(11,2).18^2 .82^9

**stats**

p yes broke = .18 p not broke = .82 P(0 broke) = 1*.18^11 * 1 P(1 broke) = C(11,1).18^10 .82^1 P(2 broke) =C(11,2).18^9 .82^2 C(11,1) = 11 C(11,2) = 55

**physics**

Once again you have not given the moment arms Torque or moment is force * distance from axis

**algebra**

(6-4)/(2-3) = 2/-1 = -2

**dumb error**

4(-4)+7 = k(-4) + 10 -19 = -4k k = 19/4

**Math Cal 1**

4(-4) + 7 = k(-4) - 4 -4k = -5 k = +5/4

**magic difficult**

I have no idea about directions or moment arms. The force furthers from the axis exerts the greatest moment, if and only if they are normal to the door.

**Physics**

mass = 2166 * (4/3)pi r^3 weight = 9.81 (2166)(4/3)pi r^3 balance weight with Stokes force weight = 6 pi ? r v so 6pi? r v=9.81 (2166)(4/3)pi r^3 9 ? v=9.81 (2166)(2)(9*10^-6)^2 9 ? v=9.81 (2166)(2)(9*10^-6)^2 v = 382472 *10^-12/? have to know ? to estimate v, see part b v =...

**physics**

ah come on 2 pi rad/22.8 s so what is the circumference? C = 2 pi R = 22.8s * 37.3m/s = 850 meters around the track so R = 850/(2 pi)

**MATH PLEASE CHECK AND HELPPP**

Always draw a picture !

**M1-math**

Nope, say F = ma a = 400/t so t = 400/a d = Vi t -(1/2)a t^2 d = 400 t - (1/2)(400/t)t^2 d = 400 t - 200 t = 200 t t = d/200 = .01/200 = 5*10^-5 s again a = 400/t = 8*10^6 F = m a = .02*8*10^6 = 160,000 N again :)

**M1-math**

momentum = m v = .020*400 = 8 kg m/s stops in 1 cm = .01 meter average speed during stop = 200m/s so time to stop t = .01/200 = 5*10^-5 seconds Average force = change of momentum/time = (8/5)10^5 = 160,000 Newtons

**physics**

Well, if you get a few million miles above the north pole and look down, the earth spins counterclockwise about its axis and also orbits counterclockwise around the sun, so take that as positive,clockwise looking up :) (sun rises in the east :) so daily spin: 2 pi rad/24 h * 1...

**Social studies**

Bethlehem Steel gave me an engraved watch at the launching. It is here in my desk drawer.

**Social studies**

My mother and I flew to California on China Clipper seaplane after bombing. Father went to sea.

**Social studies**

Yes, on bridge of Cruiser San Francisco off Guadalcanal Nov 12-13 1942, Iron bottom Sound

**Social studies**

Google Destroyer Escort 643

**Social studies**

Yes, scary then. Long story.

**Social studies**

( I lived there until January 1942.)

**Social studies**

Hawaii annexation was before the Spanish American war, agree

**math**

120 sin 8 degrees

**physics**

(1/4) as far because 25 cm/100 cm = 1/4

**physics, science!**

Oh my, I just noticed the Bob Pursley answered an almost identical question for you. note w^2 r = v^2/r and READ THE CHAPTER in your text on centripetal acceleration !

**physics, science!**

circumference = 2 pi r = 2 pi(.2) speed = v = distance/time = 2 pi (.2)/36 Ac = v^2/r F = m Ac = 37 v^2/r

**No idea**

If it is in a triangle, 72+113+x=180 otherwise I have no idea what sort of drawing you are talking about.

**PHYSICS**

fall 45 m: (1/2) m v^2 = m g h so v = sqrt(2 g h) = sqrt(90*9.81) = 29.7 m/s Vi = 29.7 average speed during stop = 14.9 so stopping time = 4.10/14.9 = .279 seconds a = dv/dt = 29.7/.279 = 106 m/s^2 looks like E, what are you using for g I wonder

**science**

I would guess pretty much constant thrust. So pretty much constant acceleration. a = F/m v = a t x = (1/2) a t^2

**science**

2^n bacteria where n is the number of periods You did not say how long a period was or how many is half full or how many is full.

**Maths: Surds**

Oh, did no. notice the "in half"

**Maths: Surds**

a(a+b) = 100 but b = 2a/(1+sqrt5) a [ a + 2a/(1+sqrt5) ]=100 a^2 [ 1 +2/(1+sqrt5) ] = 100 etc

**Maths: Surds**

I do not see your picture but suspect you are talking about what is often called the "golden ratio". http://en.wikipedia.org/wiki/Golden_ratio

**Chemistry**

if you have 2 moles of B you need 6 moles of A In other words you do not have enough A I guess I just said 2) :)

**algebra**

conversion factor is (14 gal/340 mi) (14 gal/340 mi)(544 mi) = 22.4 needed for whole trip so 22.4-14 = 8.4 more needed ============================= with proportions (I do physics not math so not my thing) 14/340 = x/544 so x = (14/340)544 again

**Physics**

a = change in velocity/time = 105/1.2*10^-3 = (105/1.2)10^3 x = 40(1.2)10^-3 - (1/2)at^2 = 40*1.2*10^-3 -(105/2.4)10^3 (1.2)^2 10^-6

**physics**

u = 42 cos 36 horizontal speed so t = 27/(42 cos 36) Vi = 42 sin 36 initial speed up h = Vi t - 4.9 t^2

**Physics**

0.5 m^3 * 2.70 * 10^3 kg/m^3 = 1.35 *10^3 kg = 1350 kg

**Calculus**

I do not see how it could be otherwise. If there were a singularity at infinity resulting in an undefined limit, then how could the domain include plus and minus infinity?

**math**

2.2222 + 4.375 = 6.6 so p = 13.2

**math**

4 3/8 * w = 9 13/18 35/8 * w = 175/18 9/9 (35/8) * w = 4/4 (175/18) 315 w = 700 w = 140/63 = 2.222...

**Technology HURRY**

It is not B

**stats**

keep this link handy: http://davidmlane.com/hyperstat/z_table.html

**Algebra 2 help its urgent please(:**

tan 62 = h/112 so h = 112 tan 62

**physics**

u = 24 m/s forever x = u t where t is time to fall 124 m h = (1/2)g t^2 124 = 4.9 t^2 t = 5.03 seconds so x = 24 * 5.03 = 121 meters

**Chemistry**

22.4 liters /mol at STP so the real question is how many mols of H2 produced wise to balance equation: Mg + 2HCl ----> MgCl2 + H2 so One mol of H2 for every mol of Mg Mg = 24.3 g/mol 4.8 g/24.3g/mol = .198 mol of Mg so .198 mol H2 .198 mol (22.4 liters/mol ) =4.42 liters H2

**proportion and percentages problems**

conversion factor is (£396.00/12 w) a) 1 w(£396.00/12 w) = £33 b) 9 w(£396.00/12 w) = £198 c) 25 w (£396.00/12 w) = £825

**Language**

You are welcome.

**Language**

where do you see petals? On a fl---- ?

**proportion and percentages problems**

You are welcome.

**proportion and percentages problems**

4 dozen = 4*12 = 48 letters so 1.200 kg/48 letters is our conversion factor, same top and bottom a) 1 let (1.2 kg/48 let) = .025 kg or 25 grams b) then 10 let = .25 kg = 250 grams c) 38 let(1.2kg/48 let) = .95 kg = 950 grams

**Language**

oh, of course :)

**Language**

what is the opposite to host? Maybe enemy? Evil landlord? I am not going to type the politician's name ?

**MATH**

distance = speed * time here 38 mi = 2mi/h * t t = 38/2 hours or 19 hours

**math help plz really urgent**

8 = log I1/s 6 = log I2/s 8-6 = log I1/s - log I2/s so 8 -6 = log (I1/I2) = 2 10^log(I1/I2) = I1/I2 = 10^2 = 100 so I1/I2 = 100

**Algebra**

14 x^2 -12 x^2 = 2 x^2 3 x + 11 x = 14 x 4 - 3 = 1 so 2 x^2 + 14 x + 1 ============================ 4 x^2 - 2 x^2 = 2 x^2 -5 x + 1 x = - 4 x +4 + 8 = 12 so what do you think ?

**social studies**

You have no 3 proofread what you typed please.

**social studies**

1. is indeed C The rest makes little sense; proofread.

**physical science**

C is your hard drive Hi. We can not get there from here.

**Physics**

call unknown vector U U = 0 i + |C| j = [bx+cx] i + [by+cy]j |C| = sqrt(7.1^2+3.1^2) so bx + cx = ux = 0 bx = -cx = -7.1 and by + 3.1 = uy = |C| so by = |C| - 3.1 B = bx i + by Jj

**Us history**

Well first of all what do you mean by "Annual rights"? A right is a right, it does not expire after a year even if there is an election. Now if you are looking for rights, the best place to start is not the Declaration but the first ten amendments to the Constitution...

**Chemistry**

you want 2 mols (half a liter of 4N) H3PO4 = 3+31+4(16) grams/mol

**Chemisty**

.300 * 5 = 1.5 mols HNO3 = 1 + 12 + 3(16) grams/mol

**Science**

fossil record?

**Grade 11 Physics: Forces**

.55 m g = 140 m = 140 /[ .55*9.81 ]

**nobody knows**

meaningless, area of what?

**Math**

9 - 8*7 + 6/3 = 9 - 56 + 2 = -45

**Math**

length = 4 x width = 3 x area = 12 x^2 = 4800 so x^2 = 400 x = 20 3x = 60 4x = 80

**maths**

area = 96 * .75*.75 = =96*9/16 =6*9 = 54 m^2 54/9 = 6

**math**

6(10) + 5(1) = 65

**Algebra**

-4 -2 +2

**algebra**

(-3)^2 -5(-3) + 1 = 9 + 15 + 1

**math**

65