# 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?

**business math**

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?

**Physics-Please help**

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 ...

**6th grade**

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)

**Physics-Please check**

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

**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...

**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 ...

**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

**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...

**Algeblease check my answer**

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

**Algebra Please check my answer**

It should have read please check-

**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-...

**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**

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

**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

**Math help please**

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

**Teachers Aide/Language and other Barriers**

my answer is A

**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