Sunday

April 20, 2014

April 20, 2014

Total # Posts: 16,179

**spanish**

Do you like to play the guitar for the teacher?

**math**

.5 (1-.8) = .5 * .2 = .1 probability that it will not rain tomorrow = 1 - probability that it will rain tomorrow = 1 - .8

**math**

.8*.6 + .5(.2) = .48 + .1 = .58 1-.58 = .42

**algebra2**

(x-4)^2 = k (y-2) x^2 - 8 x + 16 = k y - 2 k put in (-2,26) 4 + 16 + 16 = k(26) -k(2) 36 = 24 k k = 36/24 = 3/2 so x^2 - 8 x + 16 = 3/2 y - 3 2 x^2 -16 x + 32 = 3 y -6 3 y = 2 x^2-16 x + 38 y = (2/3) x^2 -(16/30 x + 38/3

**algebra**

x^2 - 4 x - 5 = -y x^2 - 4 x = -y + 5 x^2 - 4 x + 4 = -y + 9 (x-2)^2 = -(y-9) so (2,9)

**religion**

THE African religion? There is no single African religion. In the north you have Islam and Christians and Jews and as you go south you get more until you reach the Dutch Protestants in South Africa.

**Physics**

Usually you define the potential energy as zero at infinity, then it goes up as kQ1Q2/r as they are forced toward each other similarly if one were + and the other -, the potential would again be chosen zero at infinity and would be kQ1Q2/r again but since one of those Q values...

**Physics**

ten times as far apart yields 1/10^2 = 1/100 If they were d apart, now they are 10 d apart F = k Q1 Q2 /d^2

**Personal Finance**

Try here maybe: http://money.usnews.com/funds/mutual-funds/rankings/small-growth

**Rational Exponent - Formula/Equations**

You are welcome and good luck.

**Rational Exponent - Formula/Equations**

I am sorry, I do not even know the vocabulary, just how to do the problems.

**Personal Finance**

You are really better off searching with Google or other search engine. Ignore the ads that come back of course and go to the articles.

**phisecs**

v = Vi + a t a is negative (deacceleration) 0 = 19 - 2.97 t t = 6.4 seconds

**science**

F = G M m/d^2 F = 6.7*10^-11 * 80 * 4 / .01 F = 53600 * 10^-11 = 5.36 * 10^-7 Newtons

**Algebra**

A + B + C = 3400 ----------------- A + B = 1900 A + C = 2300 ------------subtract B-C = -400 B = C - 400 A + ( C-400) + C = 3400 A + 2 C = 3800 but A + 1 C = 2300 ---------------- subtract C = 1500 then A = 2300 - 1500 = 800 B = 1500-400 = 1100

**Math**

Here: http://curious.astro.cornell.edu/question.php?number=197

**Math**

so t = 1.5*10^11 / 3*10^8 = .5 * 10^3 or 500 seconds 500 seconds / 60 seconds/min = 8 1/3 minutes for a photon from the sun to get here

**Algebra**

angles of triangle add up to 180 A + (3A+8) + (A+37) = 180 all yours now

**Math**

distance = speed times time so time in seconds = distance in meters / speed in meters/second we need to know: 1. the speed of light (about 3*10^8 meters/s) 2. the distance from earth to sun (about 1.5*10^11 meters

**math**

If I were filling it with water, I would use the waterproof paint on the inside I think :) area of bottom = 4*6 = 24 ft^2 area of ends = 2 * 4 * 2.5 =20 ft^2 area of sides = 2 * 6 * 2.5 = 30 ft^2 total area of exterior (no top on it) = 74 ft^2 cost of paint = (36/12)*74 = $222...

**Intermediate Algebra**

20.00 - 9.25 = 10.75 25 q + 50 f = 1075 q + f = 30 q + 2 f = 43 divided top one by 25 q + 1 f = 30 ------------ subtract f = 13 you can do it now

**physics**

120 *10^3 meters/3600 seconds = 33.33 m/s easy way - use energy Force * distance = work = change in (1/2)mv^2 F (150) = (1/2)(3.6*10^5)(33.33)^2 F = 2000 * 10^5 = 2 *10^8 Newtons Weight = m g = 3.6*10^5 * 9.81 = 35.3 *10^5 100 * F/weight = 10^2 * 2*10^8/35.3*10^5 = .0566 * 10^...

**congruent**

I am sorry, no piece of furniture in this room is congruent to any other. Unless part of a set of dining chairs or something, I see no reason why it would be.

**congruent**

does it?

**math**

first cut it in half second cut half of one of the halves so 1/4 of the pizza is left 1/4 of a circle is 90 degrees so the two pieces at the end are 45 degrees each

**math**

8/22 = .36 or 36 % 36 * .26 + 77 (1-.26) = 66

**math**

she got a zero on it? if so 0 *.26 + 77 * (1-.26) = 57

**physics**

yes

**physics**

kinetic energy gained = Qelectron * 10 volts (1/2)(mass of electron) v^2 = that kinetic energy you just found

**brits orbit**

a a+d a+2d a+3d .... a+(n-1)d sixth term = a+5d = 3 fourteenth term = a+13d = 19 subtract to eliminate a -8d = -16 d = 2 then a + 10 = 3 a = -7 twenty first term = -7 + 20(2) = -7 + 40 = 33

**math**

(5/6) * 12 = 10 yards used for the 12 presents she has 14 - 10 = 4 yards left over

**Math**

20 x + 25 y </= 5,000 x and y can not be negative so our region is in quadrant 1, upper right for top of region line from where x = 0 and where y = 0 and we hit 5000. 20 x = 5000 x = 250 when y = 0 25 y = 5000 y = 200 when x = 0 so draw line from (0,200) to (250,0) shade tr...

**physic 1**

http://www.jiskha.com/display.cgi?id=1392741536

**physic 1**

I did this hours ago :(

**Math - Please check answer :)**

(11-5) / (1+2) = 6/3 = 2

**PHYSICS**

52.8 * 10^3 * electron charge Voltage is electric field E times distance Force is E q Force times distance = work = energy gain = E q * distance = V q That is why they call voltage "potential" :)

**Physics**

In both cases, magnitude is the same units however distance and speed are scalars and ONLY HAVE MAGNITUDE but displacement and velocity are VECTORS and have both magnitude and DIRECTION Your speedometer measures speed but for velocity you need a compass as well Your odometer m...

**Determining Probabilities**

Now really, which do you think? The theoretical probability of heads in a coin toss is .5 If you toss it 100 times are you not more likely to get closer to .5 on the average than if you toss it ten times? How likely are you to toss ten heads in a row? How likely are you to tos...

**Determining Probabilities**

or just nine out of ten of your slots are not one so the chances of hitting any one of them is certainly not 0.1

**Determining Probabilities**

same question as the last one really. Come on guess and say why you guessed that.

**Determining Probabilities**

What do you think the theoretical probability of a one is?

**Determining Probabilities**

You can not say experimental probability will ALWAYS be the same. That is the thing about experiments. The complement = 1 - p = 1 - .2 = .8 so I would pick theoretical complement = 80%

**ITT Tech**

but there are three :)

**ITT Tech**

I would have said -30 x^2

**phisecs**

I do not know what your questions is, do not see name on list

**phisecs**

22/2 = 11 m/s trick: during constant linear acceleration the average speed = (final speed + starting speed)/2

**Science Help! Just 2 Questions! Really Quick!**

First one No http://www.vocabulary.com/dictionary/placental%20mammal second one looks ok

**physics**

normal force = 1700*9.81*cos 15 gravity force down hill = 1700*9.81 * sin 15 Third law, Friction force up hill equal in magnitude and opposite in sign to gravity force down hill.

**physics 1**

I did that, scroll up

**physic 1**

F = G M m/r^2 Fmoon = Gm (Mmoon/(distance moon-earth)^2 Fsun = Gm (Msun/(distance sun-earth)^2 Fsun/Fearth = (Msun /Mmoon)[moon-earth)^2/(sun-earth)^2]

**physics 1**

Need to know distances, then square them remember Newton's third law to save time.

**Physics**

first stage v = a t = 1.4 * 8 = 11.2 m/s x = .5 a t^2 = .7 * 64 = 44.8 meters stage 2 Vi = 11.2 Xi = 44.8 a = 0 x = 44.8 + 11.2*6 = 112 went 112 meters in 14 seconds 112/14 = 8 meters/second average

**physics 1**

weight = 103 (big guy!) * 9.81 = 1010 N F = .729 * 1010 = 737 N F = m a -737 = 103 a (negative because stopping) a = - 7.15 v = Vi + a t 0 = Vi -7.15 (1.27) Vi = 9.08 m/s

**physic 1**

F along crutch angle T from vertical (I assume) F normal = F cos T Fmax friction = .937 *Fnormal = .937 F cos T F along floor = F sin T so for max F sin T = .937 F cos T Tan T = .937 T = 43.1 degrees from vertical

**physic 1**

HUH? If the rope is horizontal from box 2 to the pulley then the table is just carrying the weight of boxes 1 and 2 F = 52.4+38.4

**Physical Science-Can someone check my answers?**

4 ---> 12.5 Joules 5 ---> v = 0 at the top

**physics 1**

Without the drawing I have no idea of directions of these force vectors. I do not do magic :)

**physics**

force down = 2.27* 9.81 .79* F = 2.27*9.81 F = 28.2 N

**Science**

You are welcome, now let me think, what comes just to the right of Oxygen :)

**Science**

a) if neutral number of protons = number of electrons b) 17 c) look at periodic table

**science**

extinct

**science**

I suspect that you are right.

**science**

I know nothing about this science but do not understand why intensity would impact my triangulation to find the location.

**physics - no idea**

Hard to say with that little information about masses.

**physics**

u = 36 cos 30 = 31.18 m/s forever d = u t = 41 so t = 41/31.18 = 1.315 seconds in air Vi = 36 sin 30 = 18 m/s h = Hi + Vi t - 4.9 t^2 h = 1.4 + 18(1.315) - 4.9 (1.315)^2 = 16.6 meters high

**Geometry**

Yes

**Geometry**

V = L w H new V = (2/3)L * (1/10) w * (1/4) H = (2/120) LwH = (1/60) LwH

**science**

D - because F = G Mm/d^2 Newton did not know about Einstein

**statistics**

if n units are independent and the probability of each being up is 2/3 then the probability of all n being up is (2/3)^n HOWEVER I can not see your flow chart and therefore can not evaluate parallel paths if there are two ways to get from A to B and the probability of failure ...

**stat**

Looking at a Venn diagram I suspect true

**geometry**

add six feet at the end tan 25 = h/(x+10) tan 36 = h/x h = (x+10)(.466) h = x(.727) so .727 x = .466 x + 4.66 .261 x = 4.66 x = 17.9 ft so h = .727 (17.9) = 13 13 + 6 = 19 ft

**Algebra**

L = w+4 h = 2w 450 = w L h 450 = w * (w+4) * 2 w 450 = 2 w^2 (w+4) = 2 w^3 + 8 w^2 w^3 + 4 w = 225 w^2 (w+4) = 225 guess w around 200^.3 or 4.9 then w^2(w+4) = 213.8 not bad guess try w = 5 25(9) = 225, we are there check w = 5 L = 9 h = 10 sure enough

**scince**

scavengers ?

**MATH**

area = constant * length ^2 1/4 area = constant * (length/x)^2 x^2 = 4 x = 2 divide all lengths by 2 area scales with square of length ratio if photo is 10 by 20, area - 200 divide lengths by 2 5 by 10 , area = 50 which is 1/4 of original area

**MATH**

FOR ALL SIMILAR GEOMETRIES: all lengths including perimeter scale with the length scale so if you multiply lengths by 1.5 then you multiply perimeter by 1.5 Area is proportional to lengths squared so multiplying lengths by 1.5 multiplies areas by 2.25

**Geometry**

You are welcome :)

**Geometry**

V = (1/3)base area * height new V =(1/3) (4 base area)(height/9) so 4/9 of original

**math pre algebra**

Good luck !

**math pre algebra**

Yes, as Brady said m = slope = change in y / change in x which is exactly rise/run

**math pre algebra**

if something is proportional to something else plus a constant, you can draw a straight line of form y = m x + b where m is the slope and b is that constant that y has when x = 0

**Physics**

But if you do that do T = 0 to 90 so 2T is from 0 to 180

**Physics**

Go back to the earlier problem I just did. "range = u (2 T) = Vo cos T (Vo/4.9) sin T = (Vo^2/4.9) cos T sin T " plot range versus (cosT sinT) which is (1/2) sin 2 T so plot versus sin 2T

**Physics**

Go back to the earlier problem I just did.

**Physics**

shoot straight at the target with a little up angle for drop or shoot almost straight up so it gets the target on the way down. There are two solutions for the equations that yield time for given height of target. ( Fire the ball or lob it :) Vi = Vo sin T u = Vo cos T v = Vi ...

**Physics**

LOL 45 degrees u = Vo cos T Vi = Vo sin T at top v = 0 0 = Vo sin t - g t t = (Vo/g) sin T where t is time up time to fall is also t = (Vo/g) sin T time in air = 2 t = (2 Vo/g) sin T range = u (2 Vo/g) sin T range = Vo cos T (2 Vo/g) sin T Vo and 2 Vo/g are constants given we ...

**physics**

NO!! Newton's Third Law !!! Yes, Newton #1 Yes, Newton #2

**physics**

If no friction, same force half mass --> twice acceleration v = a t so twice the speed in the same time half d = (1/2) a t^2 twice as long --> 4 timmes distance a = twice with half the mass and same force d = (1/2) a t^2 twice a ---> twice distance

**Physics**

a liter of water is a kilogram 1500 t = Joules in if t is seconds 1500 t = specific heat water * 2 kg *(100-5)degrees K + heat of vaporization* 2 kg

**physics**

weight = 80*9.81 Newtons I do not have your diagram but assume a fulcrum and two lever arms in which case weight * lever arm from weight to fulcrum = tension * lever arm from fulcrum to tendon

**phsics**

m g = G M m /r^2 so m does not matter if we only want ration G M is constant r = earth radius (any units) but be consistent. You might use 6.38*10^6 kg R = r + d .85 G M/r^2 = G M/(r+d)^2 r^2 = .85 (r+d)^2 r = .922 (r+d) r - .922 r = .922 d d = r (1-.922)/.922 = .0846 r

**Calculus II - Trapezoidal Rule**

Oh by the way, here is the recipe for the indefinite integral . put in (1+x^3)^.5 dx http://www.wolframalpha.com/input/?i=int+x^5+dx&lk=3

**Calculus II - Trapezoidal Rule**

Get it ?

**Calculus II - Trapezoidal Rule**

8 trapezoids --> delta x = 1/8 x ______ y * f 0.0 1 * 1/2 ->.5 1/8 1.000976 1/4 1.00778 3/8 1.02603 1/2 1.06066 5/8 1.11541 3/4 1.19242 7/8 1.29225 8/8 1.41421*1/2 --> 0.707106 add them and multiply by 1/8 8.902633/8 =1.113 now do for rel int (1+x^3)^.5 dx = 1.11145 N...

**Calculus II - Simpson's Rule**

LOL you can do this one, i just did the trapezoid here 1_ 4_ _2_ _4__ 2_ _4_ _2__ 4_ 1 * values of (1+x^3)^.5 at 0 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1 You will find those y values at the trapezoid problem that I already did and use (1/8)/3 = 1/24 times sum I am a Naval Architect. I ...

**Physics**

(1/2) m v^2 = .5 * 2473 * 9 Joules

**Physics**

I am sorry. I need a picture. in general each leg must take weight/6 if 37 is from vertical then Tension* cos 37 = weight/6

**Physics**

Hey, learn how to do the last one, then do this one. I took the course (in 1954) and do not need the practice.

**Physics**

1. u = 25 cos 13 forever 2. Vi = 25 sin 13 up at start 3. top means zero velocity up 4. (1/2) m Vi^2 = m g h h = Vi^2/(2g) 5. v = Vi - g t 0 = Vi - 9.81 t t = Vi/9.81 6. same amount of time it took to go up 7. 2 t 8. - Vi 9. same old u 10. R = u (2 t) where t is the time up or...

**Physics**

zero

**Calculus II**

3 equations, three unknowns if they are co linear though, one equation will be a constant times another and there will be no unique solution.

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