# Posts by ANON

Total # Posts: 3,083

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!

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?

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

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

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?

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 ...

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+?

Chemistry
X^2+ + 2e- -> X(s) E=1.73V Y^2+ + 2e- -> Y(s) E=0.40v Which pair of species would react under standard conditions? X^2+ and Y^2+ X and Y^2+ X and Y X^2+ and Y Would it be X and Y because the E is positive?

1)b 2)d 3)b 4)a 5)c 6)c 7)b 8)a 9)d 10)c

Chemistry
Calculate the cell potential for the following reaction as written at 59 ¡ãC, given that [Cr2+] = 0.763 M and [Sn2+] = 0.0170 M. Standard reduction potentials: Sn2+(aq) + 2e¨C ¡ú Sn(s) E=¨C0.14 Cr2+(aq) + 2e¨C ¡ú Cr(s) E=¨...

Chemistry
Which of the following reagents would oxidize Cr to Cr2 , but not Fe to Fe3 ? Ca Co Ca2+ Br2 Co2+ Br- Which of the following reagents would oxidize Cu to Cu2 , but not Cl– to Cl2? Br2 Ca Co2+ Co Br- Ca2+

Chemistry
A current of 5.61 A is pass through a Ni(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 9.00 g of nickel?

Chemistry
A current of 4.60 A is passed through a Pb(NO3)2 solution for 1.20 hours. How much lead is plated out of the solution?

chemistry
a) deprotonation of the alcohol

Checking algebra answers, Is it correct 320km/1hr ↓ 320km /1hr →1m/1.609km =320m/1.609hr÷=199.3mph Answer: Round to nearest 10th =198.9mph

Chemistry
^^ these are all correct, just took the quiz!

Physics
A 85-kg snow skier is being pulled up a 17 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.4 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.6 x 10-4 m. A frictional ...

Pre calculus
How do I solve this exponent problem? I understand the exponent rules, but I getting 1 but 1 is not the answer! I don't want anyone to solve the problem for me, I want to learn how to solve this type of problem. Thank you! Solve the equation: -8=-3-6 (3sqrtx^2) Thanks again!

maths
This is a question from Brilliant dot org.

Science
Are compounds chemical or physical changes of matter?

what gets hot and cold faster, solid or gas and why?

Math
Right so, we already know that the area of the rectangle would be 170x90=15300 And the area of one circle of diameter 8 would be; 16xpi We can't estimate the amount of space wasted in between circles but we can tell through the diameter the amount of circles that will fit ...

Quantum Physics

Biology
To take the energy from an exergonic reaction and use it to power an endergonic reaction, a cell can: create the energy for the endergonic reaction to occur. Why is this false? I thought a exergonic reaction create energy for the endergonic reaction to occur?

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by selective ...

Chemsitry
The Ksp of PbBr2 is 6.60× 10^–6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0.500 M KBr solution? What is the molar solubility of PbBr2 in a 0.500 M Pb(NO3)2 solution?

Chemistry
At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 °C? Is the ksp=1.38*10^-11?

Chemistry
My calculator only show up to the 1.0*10^-9 not 1.46*10^-9. Thanks

Chemistry
The answer is wrong. ksp is not 1.00*10^-9

Chemistry

Chemistry
What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 Is the concentration of SO32- = 4.69*10^-12?

Chemistry
At 25 °C only 0.0610 mol of the generic salt AB2 is soluble in 1.00 L of water. What is the Ksp of the salt at 25 °C? AB2(s) <- -> A^2+(aq)+2B^-(aq) Is the answer ksp=9.08*10^-4?

Chemistry
At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.49. What is the Ksp of the salt at 22 °C?

Chemistry
Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by selective precipitation?

Chemistry
The Ksp of magnesium hydroxide, Mg(OH)2, is 5.61 × 10^-12. Calculate the molar solubility of this compound. Is the answer 1.1*10^-4 M?

History
1.d 2.c 3.b 4.d 5.d

English
It is wrong. COMPOSED