# Posts by ANON

Total # Posts: 2,802

**AP Calculus**

[(3/x)-(4/y)]/[(4/x)-(3/y)]

**Science**

Female silkworm moths (Bombyx mori) attract males by emitting chemical signals that spread through the air. A male hundreds of meters away can detect these molecules and fly toward their source. The sensory organs responsible for this behavior are the comblike antennae visible...

**Science**

If you were a pharmaceutical researcher, why would you want to learn the three dimensional shapes of naturally occurring signaling molecules?

**math**

If you are trying to find the area of the triangle you could use trig to find the height of the triangle and then use the formula 1/2 base x height. So draw the Isoceles triangle with each leg 3cm and the base 4cm Draw a centre line forming two right angled triangles find the ...

**Science**

x-t graph is a displacement vs time graph..right? so you would have a vertical axis as you displacement (distance) and a horizontal axis as the time (in seconds). uniform acceleration means an object moves with a change in velocity that is equal in amount. velocity is a change...

**Change of subject formular**

in y = x-8, the subject is y. to change that is to make x the subject i.e. the equation must become x = .... here are the few rules to consider; 1. change the sign of the variable when you move it to the other side of the equation. 2. the subject must always be isolated on the...

**Chemistry**

that strange!! the amount of heat evolved for a particular substance is Q = mc?T where m is the mass of that substance c is the specific heat capacity and ?T is the change in temperature during transition change or reaction. So as the mass increased so the Q as well.

**Physics**

I think its possible. How can the toy cars are controlled with a controller? isn't that an example of electricity been carried through air? If not then am wrong.

**Grammar**

I'm sending an email to my teacher. and I wanna know how to send it like the correct way. Hi Miss rodriguez I wanted to know what's my score for reading they still haven't posted it on the portal

**Physics**

The velocity of a vehicle is uniformly reduced from 72km/h to 24km/ over a distance of 250m down a decline of 1:25 the mass of the vehicle is 1.5Mg and its tractive resistance is 400N. The retardation is uniform. Calculate the total constant braking force required so I found ...

**geometery**

one could say 8/3 = 12/height h(8/3) = 12 h = (12x3)/8 h = 4.5 or use trigonometry and say sinX= 3/8 X = (1/sin)3/8 X = 22.02 which is the angle of the incline so sin(22.02) = h/12 12sin(22.02) = 4.5

**Chemistry**

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 in the polymer at...

**Chemistry**

For each pair of structures shown below, indicate whether the two species are identical molecules, enantiomers, or isomers of some other sort.

**Chemistry**

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 in the polymer at...

**Chemistry**

At very low temperatures the carrier concentration in one of these materials appears to diminish very rapidly. Why is this? Please choose the option that BEST describes this phenomenon.

**Maths**

Hi I think this is how it should be done, not completely sure please check other scources as well For this question to be answered at least a basic shape is required, is it a rectangle, is it a circle. The optimisation of the perimeter of a rectangle or square could be found ...

**math**

the rule of fractions is when you add or subtract you need to make the denominators the same 2/3 +3/5 becomes (2x5)/(3x5)+ (3x3)/(5x3) =10/15+9/15 now add the numerators 19/15 5/6 - 3/4 =10/12-9/12 =1/12 with multiplication just multiply both top and bottom 3/5 x 2/5 = 6/25 ...

**chemistry**

Scratch what i just said out. also, out of the choices provided, which one is closest to 'trigonal pyramidal', because it definitely isn't trigonal planar.

**chemistry**

It's Tetrahedral, the others i don't know.

**Chemistry**

Nope. just checked. though there might be a third correct answer...

**chemistry**

it's wrong. why is it wrong?

**chemistry**

THEN HOW DO YOU DO A)?

**Math**

Create a 3rd degree polynomial with real coefficients that has roots -1 and 4i. Write your answer in form ax^3 + bx^2 + cx+ d .

**Math**

Create a 3rd degree polynomial with real coefficients that has roots -1 and 4i. Write your answer in form ax^3 + bx^2 + cx+ .

**Science**

Explain if quadruplets-four babies born at one birth are always identical or always fraternal, or if they can be either.

**Engineering**

Please post the answers for 1_4 and 1_5

**Civil War**

What book caused many people in the north to look at slavery as a moral issue?

**Civil War**

The Fugitive Slave Law was criticized because it

**algebra**

1) how many billions of years will it take 1000 grams of uranium-238 to decay to just 125 grams? 2) a researcher had 37.5 g left from a 600 g sample of sulfer-35. how many half-lives passed during that time? 3) look at problem 2. how many days passed during that time?

**algebra**

a number cube is rolled 2 times in a row. what is the probability of rolling a number greater than 2 both times?

**Pre calc**

Projectiles are always parabolas

**physics**

A meter stick is suspended vertically at a pivot point 27 cm from the top end. It is rotated on the pivot until it is horizontal and then released from rest. What will be its maximum angular velocity (in radians/second)?

**physics**

While waiting to board a helicopter, you notice that the rotor's motion changed from 340 rev/min to 265 rev/min in one minute. Assuming that this acceleration remains constant, calculate how much longer (in seconds) it will take for the rotor to stop.

**Algebra 1**

(-2+x) (1+2x)

**Function**

Write a function rule for the area of a parallelogram whose base is 4 inches more than its height. What is the area of the parallelogram when its height is 8 inches?

**Function**

Fahrenheit and Celsius are two measures of temperature. The temperature in degrees Celsius is equal to five ninths of 32 less than the temperature in degrees Fahrenheit. What is a function rule that represents this situation?

**Functions?**

find the range of f(x) = -2x+6 for the domain {-1,3,7,9}

**Chemistry**

n is the moles of No

**Chemistry**

use your ideal gas formula, but first find the limiting reagent to find the moles of NO. Then to find volume V=(nRT)/P assume pressure to be one and temperature to be 273K R is the constant .08206. Hoped it helped. The total volume is 12.50+20 (this is true because of the law ...

**Physics Plz help me**

5.98x10^6

**Math**

Larry is 74 inches tall and his shadow is 70 inches long. At what degree is the elevation is the sun?

**algebra**

Beginning with cars made in 1981, all vehicles must contain a 17-digit Vehicle Identification Number (VIN). The first 3 positions must be letters or numbers, position 4 and 5 must be letters, positions 6 and 7 must be numbers, position 8 can be a letter or a number, position 9...

**Health**

10/10 100% raised my grade 5% thanks!

**chemistry: please check answers.**

This are all right

**social studies**

again with the articles haha "An article on Abraham Lincoln's rise to the presidency (this should NOT be about his presidency but what he had to do to become president and his struggles to become one)"

**social studies**

I'm doing a project and I need a atricle on John Brown. (Like Who was he? What did he do? What happened to him? Do I agree? and why? but I'm looking for a article and don't find one

**Algebra**

Find an equation for the line with y-intercept 3 that is perpendicular to the line 3y=2x-4. A. 2y=6-3x B. 2y=3x+6 C. 3y=9-2x D. 3y=2x+9

**Algebra**

(4x^2-2x+8) - (x^2+3x-2)=

**Chemistry**

Thanks.

**Chemistry**

Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO Quench the entire sample in water Quench half of the sample in water Cool the entire sample with air jets Cool half the sample with air Submerge the sample in a salt bath of Na2O Submerge the ...

**chemistry**

Correction, it's right. WHY it is right though, that is the question. After all, who would want to know how to do a similar question where internet access is disallowed? Anyone who hasn't just stumbled onto the question, or already knows how, that's who.

**chemistry**

it's wrong....

**Physics**

X10 are done now

**Physics**

you need to make sure you use the right value for I

**Physics**

yes i did and i also said you need to use mu/4pi

**Physics**

(I*10^(-7))/(2*(z-R))

**Physics**

mu = 4pi * 10^(-7)

**Physics**

yes but you need mu/4pi

**Physics**

correct

**Physics**

you are missing the current I in b

**Physics**

yes it is good

**Physics**

You should be using mu/4pi for answer in b

**chemistry**

Quench the entire sample in water Quench half of the sample in water Cool the entire sample with air jets Cool half the sample with air Submerge the sample in a salt bath of Na2O Submerge the sample in a salt bath of CaO

**Chemistry**

Calculate the density of atoms on plane (001) in Lithium

**chemistry**

Am i the only one to make the obvious question here? If we knew how we got the answer, we could spot a mistake that might have been overlooked this entire time. How did we get the answer?

**Physics :(( help please TT**

Where is the picture?

**physics**

last option

**First-Year Physics**

Question: s22.postimg[dot]org/comasgagh/untitled.png From my calculations, option A is correct. What am I doing wrong? Also, I can't find a relationship between amplitude and energy. Attempt: s9.postimg[dot]org/8shnsrjbj/daum_equation_1366155192269.png

**social studies?**

Before the invention of the cotton gin, how were seeds removed from cotton fiber?

**Quantum Physics**

Please Q 7 and 8!

**Quantum Physics**

WORKING ON IT AR . DISTRACTED BY SOME PERSONAL PROBLEMS IN LIFE ... NOT ABLE TO CONCENTRATE

**Quantum Physics**

the above answers to 5th question is of assignment 6 problem 5 don't get misguided

**Quantum Physics**

problem 5,7 please.

**Quantum Physics**

I meant answer to question 1 is part c. -z-h- -x-h-

**Quantum Physics**

3B is Z

**Quantum Physics**

1st is part c): -z-h- -x-h-

**Chemistry**

apparently the answer is C, yet i cannot find any explanation to it...

**algebra**

in the past professional baseball was played at the astrodome in Houston, Texas. the astrodome has a maximum height of 63.4 m. the height of a baseball t seconds after it is hit straight up in the air with a velocity of 45 ft/s is given by h = -9.8t + 45t + 1. will a baseball ...

**History**

What are some of the toughest hardships that emigrants faced along the oregon trail?

**History**

Why did people move west in the 1800s?

**algebra**

solve for x: x-18 =64

**Years ?**

"In the early 1930s" what years are those like 1900-1930 right?

**Reading/Maps**

This is what I have to do "Draw a map of mainland U.S.A. and show (draw)how the mississippi river divides the country (part of the labeling) and label both sides correctly." I was wondering if you can find me a map that way I can start it off like how exactly do I do...

**Science**

what should you consider when you plan a title for a graph?

**um math**

what does a circle graph show that a bar graph does not?

**science asap**

Air pressure decreases as altitude increases ^ which one goes on the horizontal axis and which one goes vertical axis? how did you choose this scale? (This is for a line graph)

**writing**

how can i reword this differently Free will is God’s indispensable gift to humanity, and we must allow ourselves to be open to salvation in light of the choices we make.

**math**

-5 and 5/2 are both correct answers

**math**

Katie, how is that relevant to the question? We're here to answer questions, not ask them.

**geography**

Ok thanks for the help :) the answer for the 2 was A, but I do see what you were saying about C. Since everyone is the same age that would allow more cultural similarities, but I guess us being in a jungle would be more about being stranded than actually living in a jungle. I ...

**geography**

Should it be B and A? I was kind of unsure of 1 because A seemed too obvious.

**geography**

Check my answers, please? I put an asterisk next to which ever ones are my answer. Thanks! Why do you think the Inuit have retained aspects of their early culture? *A.because they are used to that lifestyle B.because such adaptations allow them to survive in their environment ...

**Algebra 8th grade**

3a + 5b = 70 6a + 9b = 135

**Chemistry**

Nvm it was -1.02*10^3 KJ

**Chemistry**

Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) <-- --> 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e- -> Ni(s) E=-0.26 Au3+(aq) + 3e- -> Au(s) E=+1.498 G= ? KJ Would it be G=1.758? •Chemistry - DrBob222, Sunday, March...

**Chemistry**

A galvanic (voltaic) cell consists of an electrode composed of magnesium in a 1.0 M magnesium ion solution and another electrode composed of copper in a 1.0 M copper(I) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 dC.

**Chemistry**

It is still wrong.

**Chemistry**

I got -1.02*10^6 but it is wrong.

**Chemistry**

Calculate the standard free-energy change for the following reaction at 25 C degrees. 2Au^3+(aq)+3Ni(s) <-- --> 2Au(s)+3Ni^2+(aq) Ni2+(aq) + 2e¨C ¡ú Ni(s) E=¨C0.26 Au3+(aq) + 3e¨C ¡ú Au(s) E=+1.498 G= ? KJ Would it be G=1.758?

**Chemistry**

So would it be X^2+ and Y^2+?