# Posts by Annie

Total # Posts: 833

Physics
A. Suppose you had an object that you suspected had a mass of one half of one of the washer+paperclip units. (In the rest of this problem we’ll call that a “washerclip.”) Describe how you could use the balance you used in tutorial and a single washerclip to ...

chemistry
Investigating changes in colligative properties involves the measurement of a solution’s concentration in molality instead of molarity because of which of the following? the mass of the solvent does not change, but its volume does change, as temperature changes. the ...

Science
I want to thank you for all the help, I just found this sight today. I think that you and the sight are realy COOL!!!!! thanks :-)

science
Thank you. I don't know if this one is right- At the speed of 2.5m/s, how many seconnds will it take the kayak to run a 4,500 m course? what is the speed of the kayak in kilometers per hour? speed= 4,500km/2.5h*60min/1 h =270,000/2.5=108,000km/h Thank you Ms. Sue :-)

science
Ms. Sue, I want to check an answer ok? A kayak races 100m in 50s. What is its speed? This is my answer speed=100m/50s=2m/s. Thank you

science
Okay, Ms. Sue. I got this and I don't think that it is right. this is the question - I wrote the answer at the bottom. I don't think that its right. speed=4,500km/2.5h*60min/1 h=270,000/2.5=108,000km/h I think that i'm confused. Thanks

science
At the speed of 2.5 m/s, how many seconds will it take the kayak to run a 4,500 m course? What is the speed of the kayak inn kilometer per hour? I want to work it on my own, just need help with formula please thanks

Science
AWhen it is time to leave the part, the familhy could only drive at 60 km/h in the mountains. How long would it take them to travl the 270 km to their home? How fast would they need to travel to make the trip in 3h? I want to see how i write the formula and then get my answer...

physics
The drawing shows an extreme skier at bottom of a ski jump. At this point the track is circular with a radius r. Two forces act on the skier, her weight mg and the normal force FN. Which relation describes how the net force acting on her is related to her mass m and speed v ...

economics
An airline transportation consultant offers the CEO of BlueStar, a struggling new commercial airline company, the following advice concerning the airline's high operating costs in the current quarter: "You don't have enough aircraft to operate efficiently. However...

Economics
An article in BusinessWeek warned of the dangers of deflation as the collapse of numerous Asian economies was creating worries that Asia might try to "export its way out of trouble" by oversupplying everything from automobiles to semiconductors. Evidence that ...

analogies
thirty three

physics
Through the process of doing work, what allows energy to move between the external world and the system? the result of what???

math
a recipe call for 1.5 cups of mix to make 8 pancakes. John wants to make 12 pancakes and uses 2 cup of mix. Does John have the correct ratio for the recipe

English
Thank you.

English
Can someone help me analyze this poem? I don't understand the poem From a Correct Address in a Suburb of a Major City By Helen Sorrels (1908) She wears her middle age like a cowled Gown, sleeved in it, folded high At the breast Charming, proper at cocktails But the inner ...

Physics
2.5*(10^-9)%

economics
. Suppose you are a stock market analyst specializing in the stocks of theme parks, and you are examining Disneyland’s stock. The Wall Street Journal reports that tourism has slowed down in the United States. At Six Flags Magic Mountain in Valencia, California, a new ...

english
complete using a simile 1.a drunken person often walks like 2.as slow as 3.my friend can run like

biology
yesterday i posted a question about who discovered DNA and Ms Sue kindly helped me but im confused about who actually discovered DNA because there are four different names Friedrich Miescher,Rosalind Franklin,james D Watson and Francis Crick. my homework question is who ...

science
if an acid has a pH of 1.1 what is the hydrogen ion concentration of the solution expressed in scientific notation to 3 significant figures, for my answer can it be written 1 x 10^-1.1 mol dm3? or can you not use decimals in the to the power of so should i write 1.1 x 10^-1

GEOGRAPHY GCSE
please could someone help me im stuck on this question :- name three high mountain ranges in temperate latitues with valley glaciers. thankyou

English-help needed
Thanks a lot. What about the following sentences? If there is no shelf-life information from the material manufacturer,we will assign one based on our internal protocol. If there is no shelf-life information from the material's manufacturer,we will assign one based on our ...

English-help needed
I also thought that both are acceptable. However, I am confused because we usually write "The shoe manufacturer" and "The clothes manufacturer" but not "The shoe's manufacturer" or "The clothes' manufacturer". Can you help me on ...

English
We have purchased a batch of material directly from the manufacturer. 1) No discount was provided by the material manufacturer. 2) No discount was provided by the material's manufacturer. Are both sentences acceptable?

An Amusement park purchased equipment from a manufacturer for a list price of \$42,000.00 minus trade discounts of 30/20/15. Calculate the amount of the trade discount on the purchase.

English-help
1)Let the instrument switch on for 1 hour before analysis. 2)On the instrument for 1 hour before analysis. 3)Switch on the instrument and leave it on for 1 hour before analysis. 4)Switch on the instrument and conduct the analysis after 1 hour. 5)Turn on the instrument and ...

Physical Science
All of the following about water is true except that it: a.has a very high specific heat capacity compared to?

Physical Science
all of the following are true of the subcutaneous layer except it

English
Which sentences are correct? 1) Are you able to assist me on this matter? I would appreciate your assistance on this matter. OR 2) Are you able to assist me in this matter? I would appreciate your assistance in this matter. Thanks.

physics
I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.

spanish
what does las uno voy a la clase ciencia means?

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 ...

Physics
Is the average force found by F = the mass times the acceleration which is 9.8 Thank you- I'm so confused I really don't know where or what to try next Thank you

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 ...

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 ...

I'm confused........ s what is the answer? I'm sorry but I must have the same math book as you guys and this is very complicated!

math
He turns the lights often on (with spaces)

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 ...

college algebra
9 − 34 − 3(2)

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

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

College Algebra
perform the indicated operations 9-3[4-3(2)

I said number 4 so I was wrong- Thank you for explaining it and not thinking I'm a complete dope-

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...

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 ...

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

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, ...

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

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.)

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...

Thank you-I see where I made the mistake on the "j"

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-...

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?

Algebra

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 ...

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

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.

English
Can you provide some examples on the use of shall versus should?

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 ...

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 ...

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...

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 ...

Algebra
Is the answer -6? I think I got it

Algebra
How do you solve 2x^2 - 20 = 3x Thank you

Algebra
Thank you

calculate missing dimension. square based pyramid has height 92cm and volume 5.4 m cube.

Teachers Aide/Language and other Barriers

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?

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?

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...

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 ...

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.

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.

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

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

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?

chemistry
Light sensitive materials are samples under yellow lighting. Please explain what yellow lighting means.

history
what presidents make up mt rushmore

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.

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

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. :)

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

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 ...

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

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.

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

math/ algebra
Yup. That is what I got reiny. :) Thanks again.

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.

math/linear equation
Yes, you are right! Thank you

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

chemistry
dot and cross diagram of a molecule of HOCL

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

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

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...

spanish
comer=to eat, tengo=have, yo=I

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...

math
Ok so we know the distance formula: d=rt. However, to find the speed, we change this formula to r=d/t

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