Wednesday

July 27, 2016
Total # Posts: 26,563

**physics dimention**

y has no units r is length h is length g is length/time^2 so we have length^3/time^2 but for force we need m a or mass *length/time^2 we have g in there. I suspect we need mass :)
*January 8, 2016*

**physics dimensions**

A length B length/time or velocity C length/time^2 or acceleration
*January 8, 2016*

**Math**

Whew, we agree :)
*January 8, 2016*

**Math**

slope = (4-3)/(8-6) = 1/2 1/2 = (-2-4)/(n-8) n-8 = -12 n = - 4
*January 8, 2016*

**Math**

8 am at 0 8:18 at 4.5 8:48 at 7.5 miles ??? 18 min = .3 hour 48 min = .8 hour in first .3 hours speed = 4.5/.3 = 15 mph in next .5 hours = speed = 3/.5 = 6 mph average speed for the whole trip = 7.5 miles/.8 hours = 9.375 mph
*January 8, 2016*

**Math**

initial value = Vi after one year v = .8 Vi after two years v = .8 Vi *.88 after three years v = .8 Vi *.88 * .88 = .61952 Vi 1 -.61952 = .38048 so 38.048 percent
*January 8, 2016*

**Math**

2.04 * 10^7 = x * 1.025 x = 1.990243902*10^7 = 19,902,439
*January 8, 2016*

**Math**

3 1/5 / x = 4 1/2 ???? 16/5 / x = 9 / 2 or 9 x / 2 = 16/5 9 x = 32 / 5 x = 32 /45 --------------------- check 3.2/(32/45) = 4.5 ???? 32/45 = 3.2/4.5 heavens to Betsy, it is true :)
*January 8, 2016*

**mechanics**

You can get all of this from the first problem I did for you. I am beginning to get irritated.
*January 8, 2016*

**Math**

You are welcome :) That was fun !
*January 8, 2016*

**Math**

NOW if m = -1/m' Then it the lines are PERPENDICULR and they ARE -1/3 and 3 so it is not only a parallelogram but a RECTANGLE
*January 8, 2016*

**Math**

Get it now? Opposite sides have the same slope. GRAPH it carefully. I saw it on my quick sketch before I calculated slopes
*January 8, 2016*

**Math**

HE = (5+1)/(-3+5) = 3 GF = ((2+4)/(6-4) = 3 LOL, sketch wins, they are parallel NOW top and bottom FE = (5-2)/(-3-6) = 3/-9 = -1/3 GH = (-1+4)/(-5 -4) =3/-9 =-1/3 caramba! paralleogram
*January 8, 2016*

**Math**

sketch graph. Looks like a parallelogram but hang on. Might even be a rectangle:)
*January 8, 2016*

**now now, I already did it**

Hey, hang on and scroll down
*January 8, 2016*

**physics**

LOL, I just did most of this in your problem below.
*January 8, 2016*

**physics**

I assume that you are doing this a significant r>>Re so that you can not assume a constant g. It is easiest to do this with potential energy ---> kinetic energy define potential energy zero at infinity that way it is always negative, the more negative the faster. That...
*January 8, 2016*

**Calculus @ Henry**

dV = surface area * dh so dh/dt = dV/dt/surface area = Q/area
*January 8, 2016*

**Algebra**

http://www.jiskha.com/display.cgi?id=1452283876#1452283876.1452284419
*January 8, 2016*

**Algebra**

did I not do this right below here?
*January 8, 2016*

**Algebra help pls fast**

I assume you mean 8 by 8 on the bottom and 22 high. slant height from the center of a side of the base to top sqrt (4^2 + 22^2) = sqrt(500) = 10 sqrt 5 for altitude of one triangular side then A = 4 [(1/2) b h] = 2 (8)(10sqrt5) = 160 sqrt 5
*January 8, 2016*

**Math**

Well done John.
*January 8, 2016*

**I disagree with you.**

.7 * 500 = 350 2400/64 = 37.5 % 260/6.5 = 40% .2*140 = 28
*January 8, 2016*

**Pre-Algebra Help pls fast**

http://www.jiskha.com/display.cgi?id=1452283876#1452283876.1452284419
*January 8, 2016*

**health and pe**

yes detox
*January 8, 2016*

**Physics typo**

typo 147.05 J for #4
*January 8, 2016*

**Physics**

Take potential = 0 at ground level as instructed. 1. m g h = 4 * 9.81 * 1.25 =49.05 J 2. (1/2) m v^2 = .5*4*49 = 98 J 3. No friction so PE + Ke = constant = 49.05 + 98 = 147.05 J by the way that means when it stops at the top it should have potential energy of 147 J 147 = m g ...
*January 8, 2016*

**Algebra**

10- 3 = 7 8 - 3 = 5 6 - 3 = 3
*January 8, 2016*

**physics**

centripetal acceleration = v^2/r = 9/7.5 = 1.2 m/s^2 weight down = 9.81 m tension up = 495 so 495 - 9.81 m = m (1.2) 495 = m (11.01) m = 45 kg
*January 8, 2016*

**Not finished yet Mel?**

Hey, where are you ?
*January 8, 2016*

**What do you plan to do while I do your calculus?**

At least show some effort before asking some poor old retired guy to do it all.
*January 8, 2016*

**Calculus**

hint dh/dt * surface area = 4 cm^3/min
*January 8, 2016*

**Calculus**

find ds/dt when it reverses ds/st = 0 find the acceleration d^2s/dt^2 then
*January 8, 2016*

**Calculus**

L = 30 - 2 h w = 16 - 2 h V = L * w * h V = (30-2h)(16-2h)h take dv / dh and set it to zero use only resulting h values that do not give you negative w when you subtract 2 h from 16
*January 8, 2016*

**Calculus**

if y = 3x^(1/3) + 6x^(4/3) then dy/dx = x^-(2/3)+ 8 x^(1/3) and d^2y/dx^2 =-(2/3)x^-(5/3)+(8/3)x^-(2/3) extrema or inflection where dy/dx = 0 note slope undefined when x = 0 dy/dx = x^-(2/3)+ 8 x^(1/3) = 0 or 1/x^(2/3) = - 8 x^(1/3) 1 = -8 x x = -1/8 so what is d^2/dy^2 when x...
*January 8, 2016*

**History**

Well, best read up on it but I might be inclined to pick the first.
*January 8, 2016*

**History**

I am sure it is not C. Although John Smith did sail around here and actually named parts of Cape Ann in Massachusetts, he is known mainly for hanging out down around Virginia. Neither of those people was particularly easy to get along with.
*January 8, 2016*

**p.e**

I am going to contest my heredity and see if it helps.
*January 8, 2016*

**Aluminum powder Separation**

Is any of that stuff magnetic? Does any of it dissolve in anything handy?
*January 8, 2016*

**science**

Well, yes, but I would be more like does not absorb as much as dark colors do.
*January 8, 2016*

**History**

D is correct.
*January 8, 2016*

**maths**

volume of anything pointy with straight sides = (1/3) height * area of base so V = (1/3)(8)(4) pi for sphere V = (4/3) pi r^3 so (4/3) pi r^3 = (1/3)(32 pi) r^3 = 8 r = 2 diameter = 2 r = 4 cm
*January 8, 2016*

**Math**

http://www.mortgagecalculator.org/
*January 8, 2016*

**History Help pls**

I would be inclined to go with A
*January 8, 2016*

**History Help pls**

check out http://www.sciway.net/afam/slavery/houses.html
*January 8, 2016*

**History Help pls**

well, google slave plantations maybe
*January 8, 2016*

**History Help pls**

The pictures I have seen of plantation life show rows of small slave cabins. I have a sneaking suspicion that (A.) s correct but your text book must tell you.
*January 8, 2016*

**History**

Remember all that about 4/5 of a person for each slave?
*January 8, 2016*

**Checked it - ok**

-5 x^2 - 10 x - 5 = y x^2 + 2 x + 1 = -y/5 (x+1)^2 = -(1/5)(y-0) sure enough it works :)
*January 8, 2016*

**math**

k x^2 - 10 x - 5 = y k x^2 - 10 x = y + 5 x^2 -(10/k)x = (1/k)(y+5) x^2 -(10/k) x + 25/k^2 = y/k+ 5/k +(5/k)^2 (x-5/k)^2 = (1/k)(y+5 +25/k) vertex at x = 5/k and y= -5-25/k I want k negative so that the function is negative for large +or - x I want the vertex at y = 0 -5 - 25/...
*January 8, 2016*

**geography tourism maths literacy languages**

When I was a student entering college I wanted to be a Naval Architect. However it was 1955 and physics was really, really exciting. Solid state physics and electronics was just happening and the space program was happening.... so I became a physicist. However I still wanted ...
*January 8, 2016*

**maths**

(x-a)^2 + (y-b)^2 = r^2 (5/2-a)^2 + (1/2-b)^2 = r^2 25/4-5a+a^2+1/4-b+b^2 = r^2 but a^2+b^2 = r^2 for (0,0) so 26/4 -5a - b = 0 5 a + b = 26/4 center lies on 2y=3x or through(a,b) 2 b = 3 a so 26/4 = 5 a + (3/2) a 26 = 20 a + 6 a = 26 a a = 1 b = 3/2 take it from there
*January 8, 2016*

**math**

altitude is max when angle is 90 degrees area = (1/2) base * altitude
*January 8, 2016*

**science and technology**

density of water = 1 gram/cm^3 1. weight in water is 0 2.volume = 100 cm^3 because it displaced 100 grams of water Therefore if neutrally buoyant it weights 100 grams in air. 3. Buoyant force = 100 grams . That was given. 4. volume = 100 cm^2 as we said
*January 8, 2016*

**maths**

sin theta = sqrt(62)/12
*January 8, 2016*

**Physics**

.25(6+14) = 5 5/.02 = 500/2 = 250 N a = F/m = 250 N/.25 = 1000 m/s^2 I get d.
*January 8, 2016*

**Physics**

change in momentum / 0.02
*January 8, 2016*

**physics**

g = v^2/r
*January 8, 2016*

**Geometry**

In other words if I am not carrying an umbrella, it is not raining. The biconditional would be I carry an umbrella if and only if it is raining. However you might carry one even on a sunny day.
*January 7, 2016*

**Geometry**

Right, if the statement is true, the contrapositive is true. statement If a cow, then a mammal converse If a mammal then a cow who knows? Inverse If not a cow, then not a mammal who knows? Contrapositive If not a mammal, then not a cow TRUE
*January 7, 2016*

**math**

http://www.jiskha.com/display.cgi?id=1452214976
*January 7, 2016*

**Physics**

F up m g down F = m a Fup - m g = m a so Fup = m (g+a) = 5.2 (9.81 + 4) Newtons
*January 7, 2016*

**math**

xxxxx xxxxx xxxxx xxxxx 4*5 = 20
*January 7, 2016*

**Math**

If you walk fist to school, then to the shop 3.25 *5280 = 17160 feet 17160 + 900 = 18060 feet or 3.42 miles
*January 7, 2016*

**math and science both**

I do not understand your question.
*January 7, 2016*

**Physics**

F = m a mg - Ffriction = m (3) so F friction = m(g-3) = 39 (7) = 273 Newtons
*January 7, 2016*

**science**

well, you are correct if you say displacement = 0 because vector is from 0 to 0 and distance = 1 mile
*January 7, 2016*

**helpe plese**

Well I suppose because people can plan evil deeds on social media and you can make your plans with others world wide. The practice raises questions of privacy though. I am not sure privacy appears in the first 10 amendments though although there certainly are laws defining and...
*January 7, 2016*

**Math**

maybe something like this. I do not see your picture. d = 3 h 2 d + 2 h = 64 feet 6 h + 2 h = 64 8 h = 64 h = 8 feet d = 3 h = 24 feet = 8 yards
*January 7, 2016*

**Math**

8 feet * 12 = 96 inches so ceiling is 96 + 2 = 98 98 - 64 = ?
*January 7, 2016*

**math**

four dimes = 40
*January 7, 2016*

**Huh**

Please check for typos and if you have presented the entire problem Obviously if you double the mass you double the gravitational force. Now do you maintain the same angle of the circumference to the hand? do you still have 50 N or do you have a new angle and rotational speed?
*January 7, 2016*

**Math**

yes, 77 - 75 = 2
*January 7, 2016*

**Math**

5'11" = 60 + 11 = 71 inches 71 + 6 = 77 inches which is how much longer than his bed?
*January 7, 2016*

**Math**

(14 + 14 + 7 + 7)8
*January 7, 2016*

**Algebra**

So am I. cost = 50 + 170 t where t is the time in hours however you show nothing on the benefit or value side of the equation. Obviously your lowest cost per hour is to use the maximum of four hours, spreading the 50 cleaning fee out over as many hours as possible. However ...
*January 7, 2016*

**math**

2 and 4 maybe ?
*January 7, 2016*

**Physics**

check below :)
*January 7, 2016*

**Physics**

energy in = i^2 R * t i^2 = 12.25 t = 4*60 = 240 seconds so energy in = 2940 R Joules energy to boil = 60 g * 540 cal/g = 32400 calories 32400 calories(.239J/calorie) =7744 Joules so 2940 R = 7744 R = 2.63 Ohms
*January 7, 2016*

**Math**

h = -9 + 16 h = 7
*January 7, 2016*

**Math**

What you typed is 11 h - 25
*January 7, 2016*

**Do you mean 37 and 38 percent maybe?**

This makes no sense as written.
*January 7, 2016*

**History/social studies**

I guess I would ask: "Why did the new US Government decide that it was important to spread west toward the Pacific from the Atlantic Coast? What would the US look like if that had not happened? This might help: http://www.ushistory.org/us/21b.asp
*January 7, 2016*

**math**

18 servings = 4+8+12 = 24 cups so there are (4/3)cups/serving 108 cups (3 servings/4 cups )=81 servings 8 cups oj/12 cups sel = (2/3) oj/sel
*January 7, 2016*

**Maths**

I think that is the height, not the distance, but it does not matter because with 45 degrees they are identical :)
*January 7, 2016*

**Maths**

The hypotenuse is 4 and the angle is 45 degrees? You can do it.
*January 7, 2016*

**Math**

here: http://davidmlane.com/hyperstat/z_table.html
*January 7, 2016*

**math**

4.6 - 3.8 = .8 5.4 - 4.6 = .8 we have a constant slope, straight line with slope of .8/1 = .8 so a - 5, 6, 7, 8, 9, 10 , 11 b - 3.8, 4.6, 5.4, 6.2, 7.0
*January 7, 2016*

**P.E.**

You are welcome :)
*January 7, 2016*

**P.E.**

Well, certainly physical :) http://en.wikipedia.org/wiki/Twerking
*January 7, 2016*

**Math - Ms. Sue, Check!**

Yes, that is the only choice that makes any sense.
*January 7, 2016*

**Math - Ms. Sue, Check!**

That would be 3870.80 though which is not one of the choices so I do not think whoever wrote the question thought that through :)
*January 7, 2016*

**Math - Ms. Sue, Check!**

1.06^3.5 = 1.226 1.226* 3250 = 3985.23
*January 7, 2016*

**Physics**

one revolution is 2 pi radians so one Rev/second = 2 pi radians/second
*January 7, 2016*

**Intro to Chem**

24.3/40.3 = x/12.1 trick question, no need to calculate mols or anything, just proportion.
*January 7, 2016*

**Check My work ( math)**

LOL, you plug the data into the software and ask for correlation coef.
*January 7, 2016*

**Check My work ( math)**

http://www.mathportal.org/calculators/statistics-calculator/correlation-and-regression-calculator.php
*January 7, 2016*

**MATH**

u = 5 c t = time upstream (5-t) = time downstream (u-c)t = 48 (u+c)(5-t) = 10 4 c t = 48 so t = 12/c 6 c (5-t) = 10 6 c (5 - 12/c) = 10 30 c - 72 = 10 30 c = 82 c = 2.7333 u = 5 c = 13 2/3 miles/hour ----------------------------- by the way t = 12/2.73333 = 4.4 hours so 5 - t...
*January 7, 2016*

**History**

..... maybe not to wage it of course :)
*January 7, 2016*

**History**

I am sure Ms. Sue knows much more about this than I. Go with her suggestions.
*January 7, 2016*