Friday

September 19, 2014

September 19, 2014

Total # Posts: 1,834

**Chemistry**

How do u find the Hvap if you only know the slope is -.002 ?
*February 10, 2008*

**chemistry**

Thanks alot Dr.Bob!
*February 8, 2008*

**chemistry**

How do i determine the cpH20 and the delta Tmetal?
*February 8, 2008*

**chemistry**

In a calorimetry experiment in the lab, you were able to record the following data: Mass of water in a calorimeter = 90.0 g Initial temperature of water in calorimeter = 22.0o C Mass of unknown metal = 45.0 g Initial temperature of hot metal = 100.0o C Final temperature of ...
*February 8, 2008*

**chemistry**

The total pressure in a flask containing air and ethanol at 257C is 878 mm Hg. The pressure of the air in the flask at 257C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at the new temperature is ...
*February 1, 2008*

**Chemistry**

The total pressure in a flask containing air and ethanol at 257C is 882 mm Hg. If the pressure of the air in the flask is 762 mm Hg, the vapor pressure of ethanol is _____ mm Hg.
*February 1, 2008*

**physics conversions check my answers**

can you check my answers. 1. What is the corresponding barometric pressure values in mmHg if the barometric pressure is reported as: 29.7 inHg. = 754.38mmHg 31.8 inHg. = 807.72mmHg 26.4 inHg. = 670.56mmHg 22.1 inHg. = 561.34mmHg 34.8 inHg. = 883.92mmHg 2. What are the ...
*January 28, 2008*

**physics conversions**

can you check my answers. 1. What is the corresponding barometric pressure values in mmHg if the barometric pressure is reported as: 29.7 inHg. = 754.38mmHg 31.8 inHg. = 807.72mmHg 26.4 inHg. = 670.56mmHg 22.1 inHg. = 561.34mmHg 34.8 inHg. = 883.92mmHg 2. What are the ...
*January 28, 2008*

**Sociology**

How does modernization manifest itself in U.S. society? Is modernization likely to continue in the U.S.? oWhat are the consequences of modernization? can some one show me where i can find information on this I've read my book but it doesnt really tell me what i need to know
*January 25, 2008*

**math**

Solve this system 4x-12y=5 ,-x+3y=-1 by substitution
*January 22, 2008*

**Physical Science**

256
*January 18, 2008*

**Physics**

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused
*January 17, 2008*

**Physics**

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused
*January 17, 2008*

**Physics**

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused
*January 17, 2008*

**Physics**

A crate weighing 800 N is pulled 5.0 m across a floor at constant velocity. The coefficient of friction between the surfaces is 0.30. How much work (in J) is done on the crate ?
*January 16, 2008*

**math**

just put it in your calculator in reverse. so find the cube root of 22400 which is aproximately 28.2
*January 16, 2008*

**social studies**

what do estonia, latvia, lithuania, Ukraine and kazakhstan have in common
*January 16, 2008*

**math**

(-5,0)
*January 10, 2008*

**Math**

2/5
*January 10, 2008*

**Physics**

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart’s velocity after a 6.0-newton westward force acts on it for 2.0 seconds? (1) 2.0 m/s east (3) 10. m/s east (2) 2....
*January 3, 2008*

**Math**

An ancienct manuscript is on display in a museum case. To what pages is the manusript open of the product of the page numbers is 9, 312?
*December 12, 2007*

**Biology**

no you're right it is protein...starch isn't a biomolecule haha
*December 8, 2007*

**Biology**

i didn't think it was protein, i think it's starch. I actually have the same exact question, word for word I am answering right now, if you get an answer could you let me know?
*December 8, 2007*

**Accounting**

What are two distinct obligations incurred by corporations when issuing bonds?
*December 5, 2007*

**science**

why or how does a rope hold more weight vertically than horizontal?
*December 3, 2007*

**Math**

My grandson just gives up in working his division problems. He is in the 4 grade and I just cannot find a way to get him interested enough to apply and understand. Can you help me.
*November 30, 2007*

**science**

list 5 things plants must do to survive on land
*November 29, 2007*

**language arts**

What is a clarifying sentence? I have to use my spelling words and write a clarifying sentence including contex clues????
*November 28, 2007*

**WORLD RELIGION**

What god, if any, do Buddhists worship?
*November 26, 2007*

**computer programming (PYTHON)**

My first page is <html> <head> <title>Name Game</title> </head> <body> <h1>Name Game</h1> <form action="namegame.py"> <p> Enter your name: <input type="text" name="name" /> </p&...
*November 23, 2007*

**computer programming (PYTHON)**

My first page is <html> <head> <title>Name Game</title> </head> <body> <h1>Name Game</h1> <form action="namegame.py"> <p> Enter your name: <input type="text" name="name" /> </p&...
*November 23, 2007*

**Physics**

it's (A). As the cheerleader is thrown upwards, speed and kinetic energy is lost. As mechanical energy is the sum of both kinetic and potential energy, this is taken out of the question. The cheerleader will also be decelerating, so acceleration is not the case. Therefore...
*November 21, 2007*

**math- micheal is this right**

4.4>c 6.b>6
*November 19, 2007*

**math- check this please**

4. 4>c 6. b>6
*November 19, 2007*

**math- check this please**

1. 3t<-9=t<-3 2.4m>8=m>2 3.10<-2w 5<w 4.-20>-5c 4>c 5.-27>3z -9>z 6.-7b>42 b>6
*November 19, 2007*

**chemistry**

Can someone define and describe Molecular water?
*November 13, 2007*

**english**

what is the synonym for the word show?
*November 6, 2007*

**English - Play**

Sorry, there was a mistake in the question... Hello. I'm having trouble understanding a part in a play called Licking Hitler... The situation is like this... It's WWII and a team of British propaganda unit is devising up a plan to tarnish the image of the mayor of ...
*November 4, 2007*

**English - Play**

Hello. I'm having trouble understanding a part in a play called Licking Hitler... The situation is like this... It's WWII and a team of British propaganda unit is devising up a plan to tarnish the image of the mayor of Cologne(Germany)... Duffendorf (or Burgomaster) is...
*November 4, 2007*

**Psychology**

I need help in finding information for the following assignment. Compare and contrast the influence of heredity and hormones on human behavior. I can find info on heredity and behavior but not a combination of hormones and heredity.
*October 30, 2007*

**math**

The cars will be 330 miles apart in 3 hours. You got that part right. So the final answer is 1:00 pm since the question asks for what time. If you ever need any help with homework.
*October 23, 2007*

**AP Biology**

Glyceraldehydes-3-phosphate An intermediate of glycolysis.
*October 21, 2007*

**Accounting**

A company had 120,000 shares of common stock outstanding on January 1 and then sold 40,000 additional shares on March 30. Net income for the year was $280,000. What are the earnings per share?
*October 19, 2007*

**Math**

y=2x-2 xy 0 1 2 3
*October 15, 2007*

**algebra 2**

write an expression that models the sum of your earnings for three weeks and Rich's earnings for two weeks if you each work (r) hours per week and Rich receives $15 in tips per week. Simplify the expression.
*October 1, 2007*

**math-algebra**

A cup contains 9 red jelly beans, 8 green jelly beans, and 8 blue jelly beans. If a jelly bean is randomly chosen, what is the probability that it is not green? Write your answer as a simplified fraction.
*September 26, 2007*

**Physics**

A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
*September 17, 2007*

**Physics**

To hoist himself into a tree, a 71.0-kg man ties one end of a nylon rope around his waist and throws the other end over a branch of the tree. He then pulls downward on the free end of the rope with a force of 367 N. Neglect any friction between the rope and the branch, and ...
*September 17, 2007*

**physics question**

no its 9.8, because when ur on a different slopes, all the info u get, graph a velocity time graph and u should notice that the slpe is 9.8
*September 17, 2007*

**Algerba**

1/8 (10-2) = 1/8 (8) = 8/8 =1
*September 17, 2007*

**helphelphelp**

use synthetic division to work on both sides to find answer: 3| 1 -2 c| -12 0 3 3| 12 1 1 4| 0 using this, c = 1
*September 17, 2007*

**Ms. Sue -- this is for you----------------- Please help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!**

HAHAHA maybe because D doesn't make sense, and A makes more sense as the correct answer as compared to D??
*September 17, 2007*

**Infant and toddler**

How can parents enrich their toddlers learning and language development?
*September 11, 2007*

**English**

There is a connection between good reading skills,critical thinking skills,and solid writing skills,How can an understanding of the choices help face help studentsread more critically?
*September 11, 2007*

**Math**

15 minutes equaltwo how hour
*August 28, 2007*

**home economics**

Food should be kept for as little time as possible in the d............. z.................
*August 28, 2007*

**science**

All eukaryoyic cells have membrane compartments called ________ that form when part of the cell membrane an object and pinches off. That statement doesn't make sense.. All eukaryotic cells have membrane compartments called______that form when part of the cell membrane ...
*August 19, 2007*

**science**

a group of the same kind of organisms that live in the same area at the same time Colony
*August 19, 2007*

**Math**

Al can paint a room in a hours working alone. Bill can paint a room in b hours working alone. Working alone, Bill takes tow more hours to paint a room than Al. Working together, they can paint a room in 8 hours. Write down a system of two equations involving the variables a ...
*August 12, 2007*

**maths/probability**

q/ in a soccer match where team a has form figures of W/2 D/1 L/7 and team b has form figures of W/3 D/4 L/3 whatis the likely outcome of the match percentage wise for team a W/ L/ D/ ? if team a has form figures of W/2 D/1 L/7 and team b W/3 D4 L/3 you add team a,s wins and ...
*August 3, 2007*

**World History**

What are "main features" in a story? The main features are the most important parts. Here is a webpage that explains each of the points of a 7-point plot outline: http://www.wendy-wheeler.com/7point.html =)
*July 27, 2007*

**Math/Calculus**

The answer is actually -(1/5)cos(4.5t) not sin. When you plug in your initial condition for the first derivative x'(0)=0, it cancels out the C2 variable which correlates with sin. Thus leaving you with just the cos.
*July 11, 2007*

**Chemistry**

Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemistry Thanks:-) Duplicate post.
*July 10, 2007*

**Chemistry**

Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemisry Thanks:-) These are such broad subjects. My suggestion: Go to www.google.com and type in what you want to find. You will find, literally, thousands of links. The more specific...
*July 10, 2007*

**math**

what is the sum of all consecutive numbers from 101 to 200, those two numbers inclusive? Halfway between, is 150. Then add 149+151,thence 148+152, and so on till 101+199. Each instance you have 300. So it seems to me... Sum= 200 + 150 + 300*N, where N is the number of pairs ...
*July 7, 2007*

**Trigonometry**

Find the angular speed in radians per sec. of the second hand on a clock. My answer is 1 rpm =1*2pi radians/1minute(1 rotation = 2pi radians) =2pi radians/60seconds =1/30 radians/seconds It goes 2PI radians in 60 seconds. What happened to the PI? I forgot to put sorry. So the ...
*July 4, 2007*

**Trigonometry**

A car with wheel of radius 14 inches is moving in a speed of 55 mph.Find the angular speed of the wheel in radian per sec. your car is moving at 55 mph, which is 55*5280*12 inches/3600 seconds or 968 inches/second. each rotation of the wheel covers 2*14*pi inches. so the ...
*July 3, 2007*

**Trigonometry**

A wheel is rotating at 200 revolutions per minute .find the angular speed in radians per second. 200 rpm =200*2pi radians/1 minute (1 rotation = 2pi radians) = 400pi radians/60 seconds =20/3 radians/second You can follow the same procedure for the other two questions you asked.
*July 3, 2007*

**Trigonometry**

Find the angular speed in radians per sec. of the second hand on a clock. How long does it take for the second hand to make one rotation? And isn't one rotation 2pi radians? Let me know what you got as an answer.
*July 3, 2007*

**chem.**

I'm asking of six guidelines in determining significant figure,because it was my assignment... Thanks again...:-) http://dbhs.wvusd.k12.ca.us/webdocs/SigFigs/SigFigs.html There aren't six rules here but these three will do it.
*June 27, 2007*

**Chem.**

what is the six guidelines in determining significant figures? Thanks:-) With a decimal: from the decimal go to the right side of it until you see a definite number other than zero. Start there and how many numbers there are, including zero after that number are sig figs. ...
*June 27, 2007*

**Comp.**

Could anyone help me Please.. about the uses of the computer on the following fields. 1.Business 2.Arts and Films 3.Music 4.Engineering 5.Manufacturing 6.Police and Laws Enforces 7.Medicine 8.Education 9.Science and Research 10.Archeology Thanks :-) http://en.wikipedia.org/...
*June 24, 2007*

**english**

what themes do old man the sea and macbeth have in commmon? tragedy? You can look each one up at www.sparknotes.com/lit and read the "themes, symbols ... " section in each and see what you find. Let us know if you have questions once you have looked up and read these...
*June 19, 2007*

**physics**

find the average of a block being propelled propelled by an elastic band. very sorry to disturb Mr bobpurlsey again. i am very thankful to you replies. the only problem that lies in the answer is that i haven't been taught hooke's law in Grade 11. which indicates 1/2kx...
*June 13, 2007*

**physics ( disregard last post)**

hey bob, this question average force of friction thanks a lot. i only don't get one part. Now, set the potential energy of the rubber band (stretched x cm) equal to the work done on friction. does it matter how much i stretch it and what does it mean when "You can ...
*June 12, 2007*

**Physics (Bob please read)**

hey bob, this question average force of friction thanks a lot. i only don't get one part. Now, set the potential energy of the rubber band (stretched x cm) equal to the work done on friction why is this equal to work done by friction? how come we can't use velocity, ...
*June 12, 2007*

**physics**

find the average of a block being propelled propelled by an elastic band. We know it is uniform acceleration. my attempt on this problem Measure the force applied of elastic band with a newton scale. The more you strecth the farther the distance the block will travel after ...
*June 12, 2007*

**about Engineering**

I'm taking Electronics and Communication Engineering...Can you help me pls...this is my problem=First day of school the teacher ask why did you choose this course? thanks;-) Maybe you chose it because of a natural curiosity and mathematical and analytical skills you may ...
*June 5, 2007*

**English**

anyone can help me about writing basic sentence pattern.And what is some tips. These sites may help you. http://wwwnew.towson.edu/ows/SentPatt.htm http://owl.english.purdue.edu/handouts/grammar/g_sentp.html
*May 22, 2007*

**Algebra**

2(3x - 7) + 4 (3 x + 2) = 6 (5 x + 9 ) + 3 how will solve it? well you first multiply it out: 6x-14+12x+8=30x+54+3 you combine like terms 18x-6=30x+57 -12x=63 x=-63/12
*May 22, 2007*

**MATH**

I am having lots of trouble with SIMPLFYIGN RADICAL EXPRESSIONS can anyone help>? Please http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=SIMPLIFYING+RADICAL+EXPRESSIONS&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title...
*May 20, 2007*

**Math**

The base of a solid S is the simicircular region enclosed by the graph of y = the sqrt of [4-x^2] and the x-axis. If the cross sections of S perpendicular to the x-axis are squares, the the volume of S is...? I've worked this out a few ways using what I know abt finding ...
*May 7, 2007*

**math**

Write an equation for the translation of circle x^2+y^2=25, 2 units right and 4 units down. We will be happy to critique your work. We are not inclined to do it for you. what is a bird 2-2
*May 7, 2007*

**math**

Write an equation of a circle with the center (-5,-4) and radius 6. The general equation for a circle is (x-a)^2 + (y-b)^2 = r^2, where r is the radius of the circle and (a,b) are the (x,y) coordinates of the center. Make the appropriate substitutions and you will have the ...
*May 7, 2007*

**math**

Write an equation of a circle with the center(-5-8) and radius 2. We will be happy to critique your work. We are not inclined to do it for you.
*May 7, 2007*

**I am lost**

Simplify this expression x ^2 - 64 / x + 8 _______ ______ x ^2 -25 / x - 5 Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. If there's not a tutor with this ...
*May 6, 2007*

**chem**

I posted a question earlier that I was having trouble with, but I was unable to attempt to try it again for several days after posting. The question was: A buffer is made up of .300 L each of .500 M KH2PO4 and .317 M K2HPO4. Assuming tha the volumes are additive, calculate a) ...
*May 5, 2007*

**Chemistry**

A buffer is made up of .300 L each of .500 M KH2PO4 and .317 M K2HPO4. Assuming tha the volumes are additive, calculate a) the pH of the buffer b) the pH of the bugger after the addition of .0500 mol of HCl to .600 L of the buffer. c) the pH of the buffer after the addition of...
*May 1, 2007*

**Math**

2t is more
*April 24, 2007*

**nuclear chem**

which of the following choices correctly describes the decreasing ability of the radiation to penetrate a sheet of lead that is 3 inches thick? A. alpha particles > beta particles > gamm rays B. gamma rays > alpha particles > beta particles C. alpha particles > ...
*April 21, 2007*

**English**

What could be the theme of this poem? What I would like to know is the subject matter and also what could be the author's commentary on the poem. Sonnet - Silence by: Edgar Allen Poe There are some qualities- some incorporate things, That have a double life, which thus is ...
*April 20, 2007*

**Algebra**

How do you solve the following problem? 3(4+4x)= 12x+2 It has no solution. X can be any value, and it wont equal.
*April 10, 2007*

**Calculus**

I really need help with this problem an automobile accelerates from rest at 1 + 3(square root)t mph/sec for 9 seconds. How far does it travel in those nine seconds? I have found that the velocity, after nine seconds, is 63 I have figuredout the answer but i dont know how to do...
*April 1, 2007*

**English**

Hi, I'm having trouble understanding this sentence... "It comes upon one with new force in the pauses of the night that the Chaldeans were a desert-bred people." I don't know understandy why the last part of the sentence starts with "that" is in ...
*March 20, 2007*

**Chemistry**

If I am titrating KMnO4 against a sample of Fe2+, but there is also I- in the sample which of the iron and iodine will be oxidised first? Unless something is present in the sample to complex the iodide ion, KMnO4 may titrate both. How are you titatrating it? What are you using...
*March 10, 2007*

**reading**

what does third person limited mean? Third person limited describes a book in which the narrator tells the story in the third person. He knows only his own feelings and thoughts, but describes the actions and words of other characters. For more information, check this site. ...
*March 4, 2007*

**Chemistry**

What colour and formula are the iron 2+ & iron 3+ chloride complexes? http://en.wikipedia.org/wiki/Iron(III)_chloride
*March 4, 2007*

**Thomas**

What colour and formula are the iron 2+ & iron 3+ chloride complexes? The subject is science not Thomas!! It helps teachers to see the real subject area so they don't waste time reading items outside their realm. =)
*March 3, 2007*

**Math**

If the measures of the angles in a triangle are in the ration 3:4:5, the measure of the exterior angle of the triangle can not be a) 120D b)165D c)105D d)135D b 165 With the triangle ratio of 3:4:5 the equation can be made: 3x + 4x + 5x = 180 x = 15 The angels of the triangle ...
*February 23, 2007*

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