Answers by visitors named: bobpursley

I don't understand your logic. The projection of the area on the ground is ab*cos60, which is not .75m^2

(ai+bj)X (ci+dj)=ad k + bc (-k) so the cross product is only in the third direction.

surface area of a six sided box: 10x5*2+5x5*2+10x5*2 which is 250. So you need the excess added, Amount-waste=250 .9amount=250 amount=about 278cm^2 check: 278*.9=250 I wonder if the box is supposed to have a lid, I put that in the calculations.

Interesting question.

This is not a projection of a vector, it is a projection of area.

given the three dimensional unit vectors, i,j,and k, the cross product of ai+bj with ci+dj is as I calculated. See http://en.wikipedia.org/wiki/Cross_product

To me, if the author said it well, quote and cite. If the author said it well but you need to put it in the context of your remarks, paraphrase. If you want to put it in your words, summarize. Consider: " Damn the torpedeos, full speed ahead" David Farragut, in the battle of Mobile Bay. Paraphrase example....Farragut in the Battle of Mobile Bay was not concerned with limited visibility in the mined entrance, he wanted to proceed quickly to battle. Summary example...Farragut in the Battle of Mobile Bay did not hesitate to put his gunships into battle, and often ignored dangers to do so. In the battle of Island number 10, in the Mississippi River, he risked the entire fleet by transversing shallow narrow water within the enemy's cannon range. His orders to his ships were clear: Move quickly to gain position.

wouldn't it depend on the reaction, and the metal? There is not a lot of surface area on a cube.

OH- ion.

vapor pressure is dependent on the mole ratios. vapor pressusre=100.84*Molebenzene/total moles moles benzene=26/molmassBenzene moles biphenyl=16.6/molmassBiphenyl total moles add those two.

500=8000*.06+M*.08 solve for M.

how long does it take to hit the ground? 182=1/2 g t^2 solve for time t. then, how far does it go horizontally. d=61*t

Personally, I like gaussian reduction as a choice method, becausing my TI83 does it very quickly and accurately. But for your methods, graphing on a graphing calc is fast. In school, often variables are assigned whole number values, which make elimination easy, but in real life (engineering), few answers are even rational numbers, much less whole numbers.

The relative velocity is the distance divided by the time. Now subtract the train moving 90km/hr, and you have the other train velocity. Watch units.

2W+2L=21 but L=2W or 2W+4W=21 W=21/6 meters

You could have 42,500. In the stands, you have 31,750+10,475 spectators. so players, radio, newspaper,stadium workers would be=41,500 - spectators in stands. Why are not TV reporters counted?

a. calculate the moles of LiOH in 155grams, then half of that moles it the moles of CO2, convert that to grams. b. convert 102 grms CO2 to moles. What percent of the moles of CO2 in a is that?

the products are CO2 + H2O C57 h110 O6 + O2 >> 57 CO2 + 55 H2O now to find the O2: on the right, we have 114+55 O=169O or 84.5 O2 C57 h110 O6 + 84.5O2 >> 57 CO2 + 55 H2O Now since small minds cannot comprehend non whole numbers in balanced equations (what is exactly the cause of that?) we double all in the equation. 2C57 h110 O6 + 169O2 >>114 CO2 + 110 H2O Now check it.

Nuts to the note. The sum of heats gained is zero. (some of the heats gained will be negative). Heat gained by ice to zeroC+heatgained by melted ice at 0C +heat gained by water in cup+ heatgained by aluminum=0 Now the algebra: .850*Cice*(0 - (-20)) + M*Hf+1.1cwater*(0-7)+.250Calum*(0-7)=0 where M is the mass of ice melting. Now if it comes out negative, that means ice was made from the water. Hf is the latent heat of fusion of water/ice. It should be a heat gained. My gut feel and head thinking...ignore the aluminum...is that ice is formed from the water, M will be negative, but it is close in my head. Happy computing

Hf for aluminum oxide is -1669.8 kJ/mole Why are you making this so complicated? Oxygen as an element is O2, and of course, its heat of formation is zero. If you had asked what is the heat of formation from atoms, the question would be quite different.

acceleration=changevelocity/time forcefriction=mass*a you know a, and mass force friction=mu*mg mu*g=a solve for mu.

resistanc=resitivity*length/Area * coeffThermal*deltaTemp setting resistance the same resisitive1*length1/area1*coeff1*dettaT1=resistivity1*length2/area2*cxoeff2*deltatT2 areas, deltatemps are same, so in my head.. length1/length2=coeff2/coeff1 * resisitive2/resisitivity1 check my thinking.

well 50-9times z or = 50-9*z so that is thhe change: 50-9z if z=3, change=50-27=23 dollars

The theory is that there is dependency in math models, something varies, and it effects an outcome.

Here are the factors: (x+(1+sqrt(1+4k))/2) (x+(1 -sqrt(1+4k) )/2) You ought to recognize where these came from: the quadratic equation

It is possible to teach carpentry without tools, or a lab, as long as the test doesn't require any skills being demonstrated. I am not a fan of AP classes for many reasons, the principle reason being that kids think they are getting college experience, and in fact, many are not getting any experience at all.

I agree four is the best answer, but after image may or may not be "your brain automatically seeks the complements.. " I agree four is the best answer, but after image may or may not be "your brain automatically seeks the complements.. "

We will be happy to critique your work or thinking on this.

You have the slope. y= slope*x + intercept put what you have in the equation... 1= (-1/9)*19 + intercept solve for the intercept.

Post what you have done. Getting a theoretical yield of 176 grams out of 40 grams of reactants is visionary.

http://www.jiskha.com/display.cgi?id=1152569548

change the function to 1/sinTheta. Now: Horizontal Asy...when i the numerator zero? Ans: never Vertical Asy..When is the denominator zero? Ans: At multiples of Theta equal to 180 (0, 180, 360, ..). change the function to 1/sinTheta. Now: Horizontal Asy...when i the numerator zero? Ans: never Vertical Asy..When is the denominator zero? Ans: At multiples of Theta equal to 180 (0, 180, 360, ..).

Yes, correct. I would have done it this way.. n*PI n=0,1,2,3,...

The instructions are pretty clear. This will take some time in planning on your part. However, start by picking the exhibit theme. Have you considered orchids? Orchids require trees to support them, and each type of orchid has a specific insect/animal that pollinates it, and each of those has specific food needs (orchids only bloom annually), and the trees have specific canopy height requiements, and fish spread the tree seeds, ... The instructions are pretty clear. This will take some time in planning on your part. However, start by picking the exhibit theme. Have you considered orchids? Orchids require trees to support them, and each type of orchid has a specific insect/animal that pollinates it, and each of those has specific food needs (orchids only bloom annually), and the trees have specific canopy height requiements, and fish spread the tree seeds, ...

Use the formula.. Amount= Principal(1+i)^n where i is interest rate and n is years. Use the formula.. Amount= Principal(1+i)^n where i is interest rate and n is years.

http://www.mapsofworld.com/usa/states/alabama/maps/alabama-river-map.jpg

Your question makes no sense to me.

x-2xy=1 x(1-y)=1 1-y=1/x subtract one from each side.

Anna, it is not allowed in this world to post material without attribution. http://www.austmus.gov.au/geoscience/earth/jenolan.htm

Bile emulsifies fats so the wont clump in the intestines. What about the mouth, what does it do?

|TimeGabe= leaving time + stopping time Time Aaron= leaving time + stopping time.

recheck 1,3 I don't understand 2

Much better.

Your teacher ought to meet some of the folks at the textbook publisher who write and edit the textbooks. Wiki has a much better editing and proofing process.

If stealing hubcaps on Tuesday through Sunday is ok, then nothing is wrong with it.

This is not much of a topic sentence, it is cryptic. All I can think of is the old stage term center stage, so perhaps the term means putting the US into the center of the stage and measuring all else to what happens on center stage. Otherwise, I don't know.

Frankly, if you planned it, and I were the students, I would hold you accountable for the loss. And you want my goodwill? Ha. Fat chance.

By your question, it is evident you missed the point of Le Chatelier: Reaction dynamics tend to undo a reaction in equilibrium if a reaction condition (temp, pressure, concentration) has been altered. This article explains it well, somewhat wordy, but well: http://en.wikipedia.org/wiki/Le_Chatelier's_principle

Is this stump the teacher? There are standard distances for flanged elbows measured from center line, and in fact, the distances vary by type of elbow and thickness (pressure rating). Of course, you know that.

http://whale.wheelock.edu/archives/ask01/0212.html

Hmmm. The IMPOSSIBLE quiz?

You spent six hours to take a trip of distance twice 78km/hr*2hrs velocity= 2*78*2/6 km check my thinking.

That is the answer above. 2*2*78/6=52 km/hr

I will be happy to critique your thinking.

We will be happy to critique your work, all of these are straightforward use of formula. We are not going to do the work for you.

we will be happy to critique your thinking.

2. Isn't a1=-3, and d=+6 ? 3--I have no idea what the question is asking. 5. Sum= sigma(k=3,8) of (40-3k) (40-3*3)+(40-3*4) + ... as you wrote the terms. It will break down to 40*(8-2) - 3(3+4+5+6+7+8)=240-3*33=240-99= 141 as upi determined. =

What is your thinking on this? I will be happy to critique your thinking.

It makes no sense the way it is written. I wonder if it is meant to be f(x)=3(2x2(5x +1)) But without clarification, it is not possible to find the derivative.

Paste that math expression into the google search window, then write the answer to two significant digits.

on the first, the direction of travel is not specified, so it could be either. On the second, gravity is always acting downward, is it not?

What is your thinking on these? I am not much inclined to do them for you, but will be happy to critique thinking.

I don't understand you mM abbreviation, but I am certain you can find it from the fresh water solubility charts here; http://www.engineeringtoolbox.com/oxygen-solubility-water-d_841.html

How long does it take for the owners to meet? time= 10/(2*1.3) seconds What velocity did the dog travel during this time? distancedog=velocitydog*timedogran

divide the number of squares by 25 to get cm2

areacircle=PI*radius^2

65000 is standard notation. .00034 is standard notation. http://www.aaamath.com/B/g6_71hx1.htm

Would this be the layers? 7, 6, 5, 4, 3,2,1 or counting down, 1,2,3,4,5,6,7 What if you had n layers? Notice the number of people is layers Number 1 - 1 2 - 3 3 - 6 4 - 10 5 - 15 6 - 21 7 - 28 Can you see a pattern?

I would do this by experiment. It will depend on air currents, and humidity, and the material the ice is sitting on.

for the mass of iron, take the percent composition of iron in iron hydroxide times the mass. for the mass of feNO3, you have the mass of iron, use percentage composition agian to get the mass of the iron nitrate.

yes on the given percentages, get the empirical formula first. Now determine the mass of the OH, and the moles OH in the base, that is the m oles of H in the acid.

electric chair. Transmission of electrical power through the atmosphere (Tesla coil)

Do Google searchs on Tennessee art museums Tennessee opera tennessee music festival Those would be fun to me.

I don't know what the / mark in the denominator means.

Paste this into your google search engine window: 8.9*3.87 The google calculator, available in the search engine window, saves a lot of time.

3. Change 30km/hr to m/s 30km/hr*1hr/3600sec*1000m/km then distance=vi*t + 1/2 at^2

4. You need to work the units. Chang 30km/hr to meters/second. Then work it, keeping the units in the problem until you find out what your answer is, numerically, and the units.

The first is a function of x as there is one y value for all x. At any x, y=3. The second is not a function because there is no value of y defined for any x. At x=3, y can be any value, and at other x values, y is undefined.

what about mileage vs gasoline consumption? Or electric power bill vs elec consumption? Or gasoline consumption/mile vs speed driven?

Please don't multiple post.

Notice the lines have the same slope: they are parallel.

Temperature is an exponential function

I don't know that you can get a single answer to the question, nor can Christian moralists agree on the answer. Take the death penality, abortion, child labor, war as examples. Just on the basics of Christianity... http://www.biblegateway.com/passage/?search=Matthew+25:31-46 In practice, many of those who want to list the morality of Christian behaviour will ignore the requirements of Matt 25. Such is life.

Multiply out the fractions, gather the x to one side. I will be happy to critique your work.

Look at this example: http://www.sosmath.com/algebra/factor/fac01/fac01.html

defrost zone?

one hour is sixty minutes, 60+35=95

Isn't it a red herring? Having some proven prevention of AIDS does not stop an action to reduce AIDS transmission. Having to prove absolutely prevention by use of condoms is a red herring to avoid the subject of reducing the transmission of AIDS. http://www.kspope.com/fallacies/fallacies.php There probably is some diversion here also, the church is against the use of condoms for another reason....

correct, and correct.

3. No. distane= vi*t + 1/2 a t^2 I will be happy to critique your work. Be certain to change km/hr to m/s 4. No. vf= sqrt (vi^2 + 2*a*d) be certain vi is in m/s units. I will be happy to critique your work or thinking

set them equal, and solve for x x^4-2x^2=2x^2 x^4-4x^2=0 (x^2-2x)(x^2+2x)=0 x^2(x-2)(x+2)=0 and now you have four solutions (two zeroes).

2W+2L=20 l-2=w solve.

a+zero=a

Both are pretty good. Accuracy is off less than a third of one percent, and precision is almost perfect. I am wondering how you measured and calculate precision, but you did get near one hundred percent of the expected value.

3[-7+2(-5+2)]= 3[-7+2(-3)]= 3[-7+2-3]= 3[-8]= -24

(1+4k) > 0 remember the quadratic formula? sqrt (b^2-4ac) ?

Each time spheres are touched together, one gets on each sphere 1/2 the total charge. When A meets B, then each leave with -1/2 q. So continue this until the touching has ended. The total charge at the end should equal the total charge one began with (-1q)

Find out what the problem is. Is it reading skills? Here is the best system of improving your study skills ever made, it works, and it will change your life. Ask your mom to help you on this site. http://www.pinkmonkey.com/electricdesk/elec-desk.asp

Why are you posting under various names, questions without any proposed answers or thinking? We will be happy to critique your thinking, but not so happy to do your homework for you.

Wouldn't it depend on the genetic mutation rate? If mutations occur frequently, then the local climate could favor some of the mutations reproduction fitness, and "select"those mutations. Otherwise, no.