Monday
March 30, 2015

Posts by Annie


Total # Posts: 693

Physics
Have 2 identical cars each 1000kg at a speed of 20m/s. The yellow car is stopped by car's brakes in 25m while green car is stopped by concrete barrier in 1.2m. Drivers have same mass(70kg) Driver of yellow car is stopped by seatbelt in 0.150 sec. Compare impulse they ...
December 7, 2010

Chemistry
1. State specifically how you would make a conclusive test for an iron (III) salt. 2. Which test for iron (II) ions is conclusive. 3. Suppose you have a solution containing both an iron (II) salt and an iron (III) salt. How would you proceed to identify both Fe2+ and Fe3+ in ...
November 28, 2010

college algebra
9 − 34 − 3(2)
November 28, 2010

College Algebra
Perform the indicated operations 10 − 5[24 ÷ 6 ⋅ 2] 1
November 28, 2010

College Algebra
can someone tell me how to get a division symbol when posting problems in Algebra
November 28, 2010

College Algebra
perform the indicated operations 9-3[4-3(2)
November 28, 2010

Physics-Please check
I said number 4 so I was wrong- Thank you for explaining it and not thinking I'm a complete dope-
November 21, 2010

Physics-Please check
Which of the following confirms that gravitational mass and inertial mass are equal? I posted this about three hours ago and no one answered it so I'm hoping someone can look at my answer and direct me 1.Free-fall accleration is the same throughout the universe 2.Free fall...
November 21, 2010

Physic-Please help
Which of the following confirms that gravitational mass and inertial mass are equal? 1.Free-fall accleration is the same throughout the universe 2.Free fall acceleration is the same at all points where the gravitational field stength is the same 3.Newton's second llaw is ...
November 21, 2010

Algebra-Please check
Write y = 10^(x) as a logarithmic function Choices are log(x)10 = y log(y)x = 10 log(10)y = x log(x)y = 10 I think it is log (10)y = x
November 16, 2010

ap physics
A 22.7 kg mass attached to a spring scale rests on a smooth, horizontal surface. The spring scale, attached to the front end of a boxcar, reads T = 21.9 N when the car is in motion. If the spring scale reads zero when the car is at rest, determine the acceleration of the car, ...
November 14, 2010

Cal
How do you find dy/dx by implicit differentiation with respect to x? x^3 + y^5 = 1
November 8, 2010

Physics
A rotating wheel requires 9.00 s to rotate 29.0 revolutions. Its angular velocity at the end of the 9.00 s interval is 98.0 rad/s. What is the constant angular acceleration of the wheel in radians/second squared? (Do not assume that the wheel starts at rest.)
November 4, 2010

physics
Make sure you're putting the parenthesis in the correct place. Such as for part A, the formulas should be: a) (ball relative ground) = (Juan's speed)+ (ball relative to Juan) (13.6Cos(32.5))N + (13.6Sin(32.5))E =(7.8)N+(ball relative to Juan) ball relative to Juan= (13...
November 2, 2010

Algeblease check my answer
Thank you-I see where I made the mistake on the "j"
October 18, 2010

Algebra Please check my answer
It should have read please check-
October 18, 2010

Algeblease check my answer
Posted by Annie on Monday, October 18, 2010 at 7:20pm. Choose the equivalent expression(3h^-2j^3k)^2(hj^-5k^3)^-2 The signs that look like minuses are negative signs Answers: 3h^-6j^16K^-4 9h^-2j^5j^16k^-4 9h^-6j^-4k^-4 9h^-6j^-4k^-4 Please help I'm so lost right now-...
October 18, 2010

Math
I need to graph this equation y=(3/2)sin(3x+2ð)-3. What would the primary interval be for this problem and how would it appear on a graph?
October 18, 2010

Algebra
Choose the equivalent expression(3h^-2j^3k)^2(hj^-5k^3)^-2 The signs that look like minuses are negative signs Answers: 3h^-6j^16K^-4 9h^-2j^5j^16k^-4 9h^-6j^-4k^-4 Please help-I'm totally lost
October 18, 2010

English - help needed
Posted by annie on Wednesday, October 13, 2010 at 4:29pm. Are the following sentences semantically / gramatically correct? 1)Alert the supervisor to any defective material found. 2)Some equipment have been taken away for inspection. After inspection, ensure that all the ...
October 13, 2010

English - help needed urgently
After inspection, ensure that all equipment is accounted for using the checklist given. Is the above sentence acceptable?
October 13, 2010

English - help needed urgently
Are the following sentences semantically / gramatically correct? 1)Alert the supervisor to any defective material found. 2)Some equipment have been taken away for inspection. After inspection, ensure that all the equipment are accounted for.
October 13, 2010

English
Can you provide some examples on the use of shall versus should?
October 10, 2010

Chemistry
In reflux, water normally enters from the bottom of the condenser and exits from the top. What causes water to be able to rise to the top of the condenser? Also, I read from wikipedia website that in the case of the Allihn condenser, water enters from the top. Any idea under ...
October 9, 2010

Chemistry
In reflux, water normally enters from the bottom of the condenser and exits from the top. What causes water to be able to rise to the top of the condenser? Also, from the following website, it is stated that in the case of the Allihn condenser, water enters from the top. Any ...
October 9, 2010

English
1) Do we say "The information is correct as of 28 September 2010." or "The information is correct as at 28 September 2010."? 2) "I spoke with him yesterday." or "I spoke to him yesterday."? Someone mentioned to me that both sentences are...
October 9, 2010

Chemistry
I found the following procedure to prepare starch indicator solution on a website:- To prepare starch indicator solution, add 1 gram of starch (either corn or potato) into 10 mL of distilled water, shake well, and pour into 100 mL of boiling, distilled water. Stir thoroughly ...
October 6, 2010

Algebra
Is the answer -6? I think I got it
October 6, 2010

Algebra
How do you solve 2x^2 - 20 = 3x Thank you
October 6, 2010

Algebra
Thank you
October 6, 2010

Math help please
calculate missing dimension. square based pyramid has height 92cm and volume 5.4 m cube.
September 30, 2010

Teachers Aide/Language and other Barriers
my answer is A
September 27, 2010

Chemistry
How would you usually prepare starch indicator solution for iodine titrations? Can the solution be stored for a few months in the fridge? I noticed that sometimes the starch indicator solution in the fridge has turned cloudy, in which case we should prepare a new solution?
September 25, 2010

physic
The angular position of a point on the rim of a 45.8 cm rotating wheel is given by θ(t) = 3.6 t2 − 2.8 t +7.5, What is the instantaneous speed v of the point at time t = 6.5 s?
September 20, 2010

Chemistry problem
I refer to my earlier post on v/v versus w/w. I would be very grateful for any advice provided. For 95% ethanol purchased from manufacturer, we normally take it as 95%v/v. For 98% sulphuric acid, it seems like it is normally 98% w/w. I have also seen a potassium hydroxide 85...
September 20, 2010

Chemistry - v/v versus w/w
Thanks a lot:) So just to confirm: normally for any chemical bought from manufacturer, if it is not stated, the % usually means v/v? Seems like for conc sulphuric acid, when it is stated 97% sulphuric acid, it means 97% w/w sulphuric acid? Thank you very much. Posted by annie ...
September 20, 2010

Chemistry -repost thank you in advance
I have a bottle of 95% ethanol purchased from the manufacturer. Normally, when it is not stated, does it mean 95% w/w ethanol? I need to prepare 100ml of 40% v/v ethanol solution from 95% ethanol. Please show me the calculation steps. Thanks.
September 20, 2010

Chemistry- urgent help needed
How do I prepare 40% v/v from 95% ethanol? When we say 95% ethanol, do we usually mean 95% w/w ethanol unless otherwise stated? Please show me the calculation steps to prepare 40% v/v from 95% w/w ethanol. Thanks.
September 19, 2010

Chemisty - urgent
Hi, how do I do the calculation? Thanks
September 15, 2010

Chemisty - urgent
How do I prepare 30% v/v ethanol from 95% ethanol? Thanks.
September 15, 2010

Chemistry
Sorry,please ignore my earlier post. Light sensitive materials are sampled in a room with yellow lighting. How is it different from normal white light?
September 14, 2010

chemistry
Light sensitive materials are samples under yellow lighting. Please explain what yellow lighting means.
September 14, 2010

history
what presidents make up mt rushmore
August 26, 2010

ecology
Explain atmospheric circulation and seasonal changes in the sun's orientation to earth to explain the highly seasonal rainfall in the tropical dry forest and tropical savanna biomes.
August 9, 2010

ecology
Why does the rainy season in the tropical dry forest and tropical savanna biomes come during the warmer months?
August 9, 2010

math
Oh wow, yes. you are right. That does make perfect sense! Sometimes I read to much into a problem. Thank you for simplifying for me Mrs. Sue. :)
July 30, 2010

math
yes, but .49 does not seem realistic. I may be doing something wrong. Thanks
July 30, 2010

math
Ok. I pretty much have this one solved but the final answer has me stumped. The probability that Luis will pass his statistics test is 0.51. Find the probability that he will fail his statistics test. This is what I have so far. P(fail)=.51; =1-.51. But I am not sure of the ...
July 30, 2010

Math
Yeah, I thought so just wasn't sure. Thank you!
July 30, 2010

Math
Ok. I have one more question. The mean height of 5 students is 59.4. If one of the students leaves, the mean height becomes 61. What is the height of the absent student? I have this so far but still having problems solving it: 5(59.4)=4(61)+1(X);X=? Thank you so much.
July 30, 2010

math/ algebra
ok, so my final answer is h=2, k=0, r^2=64, then r=8, is this right?
July 30, 2010

math/ algebra
Yup. That is what I got reiny. :) Thanks again.
July 30, 2010

math/ algebra
Thank you for your help! The question is what is the center and radius of the circle. (x+2)^2+y^2=64. Thank you so much.
July 30, 2010

math/linear equation
Yes, you are right! Thank you
July 30, 2010

chemistry
calculate the number of moles of carbon dioxide in a volume of 50.0 mL of carbon dioxide, assuming a pressure of 1.00 atm and a temperature of 23.0C
July 27, 2010

chemistry
dot and cross diagram of a molecule of HOCL
July 11, 2010

COLLEGE
IN A CLASS OF 100 57 STUDENTS RECEIVED A GRADE A WHAT FRACTION DID NOT RECEIVE AN A
June 4, 2010

Algebra
Evaluate a+b/10 for a=66 and b=4 a+b/10 = (simplify the answer)
May 26, 2010

math
Three pieces of wood are needed for a project. They are to be cut from a 90-cm-long piece of wood. The longest piece is to be 3 times as long as the middle-sized piece and the shortest piece is to be 10 cm shorter than the middle-sized piece. Can this be done with two cuts? If...
May 23, 2010

spanish
comer=to eat, tengo=have, yo=I
May 16, 2010

statistics
Bellevue Hospital in New York City uses 100.6 °F as the lowest temperature considered to indicate a fever. a. (0.1 point) What percentage of normal and healthy adults would be considered to have a fever? : b. (0.1 point) Does this percentage suggest that a cutoff of 100.6...
May 10, 2010

space
Will a lightbulb pop in space?
April 19, 2010

chemistry
A 1.00 L volume of helium gas is cooled from 50.0 degrees celcius to 25.0 degrees celcius. If the pressure remains constant, what is the final volume?
April 19, 2010

social studies
The religion of Islam (Muslums) and Christians are two different groups and cultures. Muslims are strict--can't speak to a woman until they they are engaged, yave to pary 5 times per day, women wear veils, marriages are arranaged, etc...women can't wear bathing suits...
April 16, 2010

6th grade
what is a word for what happens when you are confused?
April 15, 2010

math
If Titanic hit an iceberg at 11:40 p.m and 2 hours and 40 minutes later it sank, what time did it sink at?
April 14, 2010

social studies
What social classes existed in Aryan culture?
April 6, 2010

math
would (3x^4/15)^2 be x^8/25 when finally simplified?
February 24, 2010

math
if you had m^0g^0 would you leave it in that form or would the simplified version be 1?
February 22, 2010

mathy
if you had m^0g^0 would you leave it in that form or would the simplified version be 1?
February 22, 2010

math :(
Last year you mowed grass and shoveled snow for 10 households. You earned $200 per household mowing for the entire season & $180 per household for shoveling the entire season. If you earned a total of $1880 last year, how many households did you mow and shovel for?! How would ...
February 9, 2010

math
I totally understand now! i had the 2x+4y=100...i just was blanking out about how to set up the 2nd part but I see now! Thank you so much! :)
February 7, 2010

math
Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. How many of each type of question are on the test? How would you set this up?
February 7, 2010

Math
Use systems of lineear equations to solve: An airplane flew for 6 hours with a 22-km/h tail wind. The return flight against the same wind took 8 hours. Find the speed of the plane in still air. I know the answer is 154 km/hr (back of book resources :) )...I just don't ...
February 4, 2010

physics
20(2090)(20+6)=1086800 J
January 27, 2010

Science
What is a bogus analysis using quasi-scientific jargon, but has little or no objectivity.
January 26, 2010

L.A.
is this a good beginning?!??! The movie, "Swing Kids", is not a light hearted, family film, but rather one that provokes deep emotions and thoughtful thinking within the viewer. This movie contains interesting information that shows the viewer how difficult it was ...
January 25, 2010

space
What is the force of gravity at 220 miles above Earth's surface? Calculate how much of a g force the astronauts are actually experiencing. The solution for this math problem is a percentage. You can calculate it using the Algebraic equation: gr = R2/r2 x g R = the radius ...
January 21, 2010

which of the folling values repesents an index of
which of the folling values represents an index of refraction of an actual material
January 11, 2010

Trig
How do you find csc 163degrees 20minutes? (I didn't know how to insert the degree and minute marks)
January 10, 2010

6th grae math
how can you add and multiplication at the same time
January 4, 2010

precalculus
convert the equation y^2 = 2x -x^2 into polar form. convert the equation r = 2tan(theta) into rectangular form. I'm not really sure what either of these mean. I vaguely understand polar coordinates, but I'm not sure how to convert equations back and forth between polar...
December 6, 2009

precalculus
Two people standing 30 feet apart look east at the top of a tree. The first person looks up at an angle of 78 degrees. The second person looks up at an angle of 62 degrees. How tall is the tree (to the nearest foot)?
December 6, 2009

Algebra
Sixty-two percent of the students at Kennedy High School are involved in extra curricular activities. If 152 students are not involved in extra curricualr activities, how many students are there at Kennedy High School?
November 18, 2009

math
thanks
November 15, 2009

math
i meant what is the mass of the block?
November 15, 2009

math
what is the density of the block? density is 2700 volume is 10^-4
November 15, 2009

math
sorry Ana... i missed typed it...again i apologize
November 15, 2009

Physics
i figured it out..thanks for helping me
November 15, 2009

Physics
A block of mass m1 = 4.80 kg sits on top of a second block of mass m2 = 15.6 kg, which in turn is on a horizontal table. The coefficients of friction between the two blocks are µs = 0.300 and µk = 0.100. The coefficients of friction between the lower block and the ...
October 31, 2009

Maths
Find the equation of the normal to the curve y = 3x^2 - 5x that is perpendicular to the line y = x + 4.
October 23, 2009

Com.
1.Assignment: Negative Messages Using templates or sample documents to help you write e-mails, memos, and letters may be helpful for inexperienced writers; however, customize the communication, so the document does not appear as a form letter. Use the information in your Week ...
October 18, 2009

physics
Hey thanks! At one point I was using (3/2)R(deltaT) but I wasn't setting it equal to (DeltaQ).
October 4, 2009

physics
We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 123C. The gas expands and, in the process, absorbs an amount of heat equal to 1300J and does an amount of work equal to 2040J. What is the final temperature of the gas? Use R= 8.3145J/(mol*K) for...
October 4, 2009

6th grade
The lines of latitude divide the globe into units called what?
September 10, 2009

Geography
That was pretty quick! Thank you soo much! :D
September 8, 2009

Geography
What are the capitols of the following countries? 1. Spain 2. Mexico 3. Puerto Rico 4. Peru 5. Venezuela 6. Ecuador 7. Chile 8. Uraguay 9. Argentina 10. Cuba 11. Dominican Republic 12. Bolivia 13. Colombia 14. Paraguay 15. Panama 16. Nicaragua 17. Honduras 18. Guatemala 19. ...
September 8, 2009

Organic Chemistry
If biphenyl dissolves in both cold and hot methanol, would this be a good recrystallization solvent for biphenyl? Explain please!!!
August 26, 2009

English
In Great Expectations, what are the three spiritual stages that Pip goes through? What changes in Pip mark each progression into the next?
July 25, 2009

Chemistry
An ion exchange process may be used to remove ions causing hardness of water. Outline how this works. 1. Ca2+ and Mg2+ are the ions that cause the hardness of water, one example of softening the water is to react the hard water with NaCO3 (Sodium bicarbonate) to soften the ...
May 30, 2009

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