# Posts by Rachel

Total # Posts: 1,544

**Physical Science**

At the stand of a racetrack you notice smoke from the starters gun before you hear it fire Explain.

**Physical Science**

Why is an echo weaker than the original sound?

**Physical Science**

If we double the frequency of a vibrating object what happens to its period?

**Geometry**

The image of P(-1, 5) under a translation is P'(5, 7). What is the preimage of P? Could someone show me steps on how to do this problem, and the answer please? Thank you.

**Pysical science**

What is the net magnetic force on a compass needle?

**math**

How do I complete the square for a quadratic equation? I'm not sure how to do it.

**math**

Am I foiling this right? The problem is (x-5)^2 and I got x^2-10x-10. Is that right?

**Biology**

Can someone please help me ! i don't know how to read a gel electrophoresis. thank you

**Physical Science**

A friend tell you that a refrigerator door beneath it's layer of white painted plastic, is made of aluminum. How could you check to see if this is true withoutscraping away the plastic?

**Physical Science**

I still don't get it.

**Physical Science**

When a car is moved into a painting chamber, a mist of paint is sprayed around it. When the body of the car is given a sudden electric charge and the mist of the paint is attracted to it, prsto the car is quickly and uniformly painted. What does the phenomenon of polorization ...

**Physical Science**

Why does a magnet attract an ordinary nail or paper clip but not a wooden pencil?

**Physical Science**

What is the net magnetic force on a compass needle? By what mechanism does a compass needle line up with a magnetic feild?

**Physical Science**

If every iron atom is a tiny magnet why aren't all iron materials themselves magnets?

**Physical science**

Your right sorry, it is watt-sec.

**Physical science**

What unit is represented by a. joule/coulomb b. coulomb/second c. watt/second

**Physical Science**

There are three ways to cook popcorn, list them and relate hoe cooking popcorn is really an example of three ways heat can be tranferred.

**Physical Science**

What is the purpose of the layer of copper or aluminum on the bottom of a piece of stainless steel cookware?

**Physical Science**

Thank you drwls, you are a lifsaver!!

**Physical Science**

Turn an incandescent lamp on and off quickly while you are standing near it. You feel it's heat, but you find when you touch the bulb that it is not hot. Explain why you felt the heat from the lamp?

**Physical Science**

The heat of volcanoes and hot springs comes from trace amounts of radioactive minerals found in the Earth's interior. Why isn't the same rock at the Earth's surface warm?

**Physical Science**

In your room are things such as tables, chairs and other people. Which of these things has a temperature lower than air? Greater than air? And equal to the temperature of air?

**Physical Science**

After a car is driven for some distance, why does the air pressure in the tires increase?

**Physical Science**

On which temerature scale does the average kenetic energy of molecules double when the temperature double?

**Physical Science**

A 0.6-g peanut is burned beneath 50 g of water, which increases in temperature from 22degreesC to 50 degreesc. What is the exact food value of the peanut? (Assuming a 40% efficiency)

**Physical science**

After a car is driven for some distance, why does the air pressure in the tires increase?

**Physical science**

On a perfect day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward or downward. The total wieght of the balloon, including its load and the hot air in it is 20,000N. Show that the volume of the displaced air is 1700 m3 (Hint:Buoyancy in a Gas)

**physical science**

A merchant in Kathmandu sells you a solid gold 1-kg statue for a very reasonable price. When you get home, you wonder whether you got taken, so you lower the statue into a container of water and measure the volume of displaced water. Show that for 1 kg of pur gold, the volume ...

**math- Triangle facts**

Thanks!

**math- Triangle facts**

Given: 2x-3>7 Prove:x>5 Assume: x<5 or x=5 Using a table with several possibilities for x given that x<5 or x=5 x - 2x-3 1 = -1 2 = 1 3 = 4 4 = 5 5 = 7 It's a contradiction because then x<5 or when x>5, 2x-3< or = 7 So in both cases, the assumption ...

**math- Triangle facts**

Explaining the isosceles theorem. Explain why the SAS Inequality theorem is also called the Hinge theorem. the steps for Indirect Proofs and using an indirect proof with an algebraic problem.

**math**

thanks

**math**

using a triangle to explain the theorem and giving a good example with one.

**math**

How can I explain the angle sum theorem? and whats a good example for it?

**physical Science**

Two people who weigh the same climb a flight of stairs. The first person climbs the stairs in 30 s, while the second person climbs them in 40s. Which person does more work? Which uses more power?

**physical science**

You are at the front of a floating canoe near a dock, you jump expecting to land on the dock, instead you land in the water. Explain this in terms of momentum conservation.

**Government**

Today unions (A) have generally experienced a tremendous increase in membership (B) have not succeeded in organizing any white-collar workers (C) are divided into two large organizations, the A.F.L. and the C.I.O. (D) have generally experienced a decline in membership, ...

**French**

Hey again, i've made the corrects you suggested...and i was hoping you could proof read just to make sure i did them correctly...Thankz Noël La saison de Noël est l'époque de l'année que je préfère. C’est une fête ...

**French**

Hi yall. I have been trying to write this paragraph on Christmas and I was just wondering if someone could read it and see if im totally off the mark....thanx yall La saison de Noël est mon temps favori de l'année. C’est une fête religieuse et il y a...

**French**

Hi, i hope i have correctly made the changes you suggested. I was hoping that you could just re-read it to make sure that i have made all the needed corrections. Thank you so much. :D Noël La saison de Noël est l'époque de l'année que je pr&...

**French**

THANK YOU SO MUCH..i will repost it when i have made the changes

**French**

thanks so much for your help :D

**French**

La saison de Noël est mon temps favori de l'année. C’est une fête religieuse et il y a toujours beaucoup d’activités. Chaque année, je célèbre le Noël avec ma famille et ma famille étendue. L’ann&...

**French**

Le Noël La saison de Noël est mon temps favori de l'année. C’est une fête religieuse et il y a toujours beaucoup d’activités. Chaque année, je célèbre le Noël avec ma famille et ma famille étendue. L...

**French**

Hi yall. I have been trying to write this paragraph on Christmas and I was just wondering if someone could read it and see if im totally off the mark....thanx yall La saison de Noël est mon temps favori de l'année. C’est une fête religieuse et il y a...

**geography**

What does a coast guard have to do with the study of geography?

**Government**

Name four broad categories of the Social Security Program and explain the purpose of each category.

**Government**

Thank you, I haven't been thinking straight lately...

**Government**

The most extensive series of laws protecting labor were passed: A: by the federal government during the New Deal under Franklin D. Roosevelt B: by state legislatures before the Civil War C: by the federal government in recent years under John F. Kennedy

**American Literature**

Thank you!

**American Literature**

Using literary elements, compare and contrast Abigail Adams' letter to her daughter with Jean de Crevecoeur's essay from Letters from an American Farmer.

**Science**

What is the only continent that traces of ancient human life have not been found?

**math**

okay i need to find a complamentry angle whos difference is 12 degrees

**math**

okay i need to find a complamentry angle whos difference is 12 degrees

**math**

how do i do all partial methed

**English**

Anybody have a good essay topic for "Sir Gawain and The Green Knight". Thanks for the help!

**Math**

Why can letters of a Polygon's name be used only once?

**subject**

Do you mean Wikipedia? Try that one, I like using it.

**Phy**

When light passes from air to glass, the light may change direction due to refraction. T or F?

**German**

anyone?

**German**

True or false: The Reichstag refers to the legislative body or Congress in Germany. ??????????????????????????????????

**math**

a rectangle has two sets of parallel sides so it cant be that.

**math**

well, if its not a rhombus or a trapezoid then.... what has two right angles and one pair of parallel sides?

**math**

what am I? I am a polygon and I have two right angles and one pair of parallel sides. Is it a rhombus? Please help.

**History**

whats material were Portrait Masks made out of?

**Soc. studies**

what chemical was used to embalm the organs?

**math**

the name and birth place of a famous person born in 1893 and why?

**Pre Algebra**

I love Pre Alegbra but i don't get it

**Punctuation within sentences-hyphen**

A bleeping sound came from his pocket it was his mobile phone signalling he would have to respond right away wouldnt he can you help me punctuate this sentence?

**math**

13.7b-6.5=-2.3b+8.3

**Social Studies.**

i love chicken

**science/chemistry**

we did a lab on chemical change, where we had to see how a chemical change affcts mass. so we measure the mass of 20ml of copper solution, and 2cm(cubed) of steel wool, and then we mixed them into a flask. soon the steel wool turned rusy, and broke apart. and the duofilm(which...

**physics**

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 24 degrees below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration ...

**Pre-Algebra**

klkl

**history**

do all civilizations have laws?

**history**

i need as much information on laws that you can give me PLEASE

**Geometry**

If two angles are congruent, must their supplements be congruent? Thank you, anyone, in advance. c[=

**science**

if a cyclist is traveling at 20km in a half in hour, is her average speed 1okm pher hour?

**accounting**

An investment under consideration has a payback of five years and a cost of $1,200. If the required return is 20 percent, what is the worst-case NPV?

**Economics**

Graph the supply and demand curves of Qd=500 - 2P and Qs = -100 + 3P

**Economics**

Graph the supply and demand curves of Qd=500 - 2P and Qs = -100 + 3P

**Math**

Find the derivative of the quotients: y=4X/(X-3) --What would (x-3) be?

**Econ/Math Derivatives**

Find the derivative of the quotients: y=4X/(X-3)

**Science**

The question is: Scientists do their experimental tests more than once, so they can reduce the effects of chance errors. This is called conducting____________? 14 letters. Anyone know the answer?

**Math/Econ**

If the demand curve is P=12.4-4Qd and the supply curve is P=-2.6+2Qs, What is the equilibrium price? What is the equilibrium quantity?

**Math/Econ**

P=12.4-4Qd How do you get P into this equation to make it Qd=12.4-4P?

**Managerial Econ**

How do you get P=12.4-4Qd to equal P=-2.6+2Qs? You have to find the equalibrium so you have to set Qd=Qs so I can't figure out how to get p in the equations and the equations to equal Qd & Qs.

**Pre Algebra**

7. 3132 8. 6400

**ireland**

how many hours do people typically work in week (in ireland)? Check this site for the length of the normal work week in Ireland. http://www.fedee.com/workinghours.shtml thanks,you have really helped me You're very welcome. I hope you enjoy your study of Ireland.

**ireland**

which careers are the most desired in ireland? Since 64% of Ireland's people work in service industries, these are the most desired jobs for the population. Ireland does a lot of computer and information technology.

**ireland**

what are the most common careers in ireland? Accordiing to the source linked below, Ireland's workforce is divided as follows. agriculture: 8% industry: 29% services: 64% (2002 est.) https://www.cia.gov/library/publications/the-world-factbook/geos/ei.html#Econ Industry ...

**ireland**

Is a free choice of careers in ireland or is a career chosen for each person by the goverment? Ireland has free choice of careers. Just as in most of the world, Irish people can hold any job for which they are qualified. thank you for the help You're very welcome.

**Biology**

an artificial surfactant.... Google it! Its the right anwser!

**Microeconomics**

What kinds of situations can moral hazard exist? Are there ways that the government reduces the amount of moral hazard? Thanks so much! RB This site may help you. http://en.wikipedia.org/wiki/Moral_hazard

**Math**

I need to solve this with the substitution method. 3x + y = 6 3x + y = 3 Is it possible or is it a typo on the worksheet? I can't figure it out! Try the following very nice site: (Broken Link Removed)

**math**

how do i do long division? This web site may help you. http://www.coolmath4kids.com/long-division/long-division-lesson-1.html dont listen to drbob222

**Chemistry**

"Find the pH of the solution obtained when 32 mL of 0.087 M ethylamine is titrated to the equivalence point with 0.15 M HCl? Do I need to do a rice table for this problem? I'm having difficulty starting this problem... Thanks!

**math**

how do you calculate metric surfaces? not sure what you mean. are you finding areas of surfaces that have metric units? are you converting between units of area in the metric system? give a specific example or problem.

**spelling**

What is the relationship between the word assignment and the following sentence? "The noble elephant marched near Goshen, Indiana," said Sam's aunt. Please rephrase and repost. Your question is not clear. Thanks. =)