Questions Asked on
February 21, 2008

Physics
How many days does it take for a perfect blackbody cube (0.0100m on a side, 30.0 degree C)to radiate the same amount of energy that a onehundredwatt light bulb uses in one hour? I got no idea to do it. Please give me some hints!!!Thanks!!!
asked by Joy 
Science
If you walk 20m, took a book from a library table, turned around, walked back to your seat. What are the distance and displacement travel by you? What are the distance and displacement traveled by the book?
asked by Jennifer 
Science
An object speed up. Then it slows down. Then it changes direction. Which of these are examples of acceleration?
asked by Carly 
Math: Geometry
The circumference of the base of a cylinder is 16 cm. The height of the cylinder is 10cm. a. What is the surface area of the cylinder? b. What is the volume of the cylinder? Need help on this one. I have the formula but I'm a little confused because I
asked by Marcus 
physics
At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg.
asked by Lydia 
math
the gas tank of your car holds 21 gallons. It is 1/3 full. How many gallons will it take to fill the tank?
asked by losted 
Math  Product Dot Vectors
How would you expand and simplify the following equation? "(3a + 4b) product dot (5a + 6b)" Textbook answer: 15 a ^2 + 38a product dot b + 24 b ^2
asked by Anonymous 
Math (Geometry)
"The graph shows types of trash in a typical American city. Find the measure of each central angle to the nearest whole number." (I do not want all the answers, I just want to know HOW to get them so I will only post the first three problems that
asked by Robert 
science: physics
A 2.0 kg breadbox on a frictionless incline of angle is connected, by a cord that runs over a pulley, to a light spring of spring constant , as shown in Fig. 842. The box is released from rest when the spring is unstretched. Assume that the pulley is
asked by gia 
chemisty
in a sodaacid fire extinguisher, concentrateed sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water. How many moles of sodium hydrogen carbonate would be neefed to react with 150.0 grams of sulfuric acid?
asked by leslie 
science
When you are describing the rate that a race car goes around a track, should you use the term speed or velocity to describe the motion? Can the velocity of the car change without changing the average speed of the car?
asked by Jennifer 
physics
A Goodyear blimp typically contains 5400m^3 of helium (He) at an absolute pressure of 1.1*10^5Pa. The temperature of the helium is 280K. What is the mass (in kg)of the helium in the blimp? PLEASE GIVE ME SOME IDEAS TO DO IT!!!THANKS A LOT!!!
asked by Amanda 
physics
how much kinetic energy will an electron gain in J and eV if it accelerates through a potential difference of 23,000 volts
asked by shtam8er 
PHYSICS
Suppose that a tank contains 680m^3 of neon at an absolute pressure of 1.01*10^5 Pa. The temperature is changed from 293.2 to 294.3 K. What is the increase in the internal energy of the neon? I don't have any idea to do it. Please help! Give me some
asked by Annie 
english/revise long paper
“Invisible Children,” a documentary filmed by three American college students, Jason Russell, Bobby Bailey, and Laren Pole, who set out for Africa in search for a story; however, they discovered the immense suffering of Acholi civilian population in
asked by christi 
Algebra
Simplify: (4m/5n^2)(n/2m) A)(8m^25n^3)/10n^2m B)(8m^2+5n^3)/10n^2m C)(4mn)/(5n^22m) D)2/5n^2 I chose C 4m/5n^2  n/2m 4m/5(n)^2  n/2(m) C
asked by Jon 
Honors Geometry
You work for a fencing company. A customer called, wanting to fence in his 1,320 squarefoot rectangular garden. He ordered 148 feet of fencing, but you forgot to ask him for the width and length of the garden (these dimensions will determine some of the
asked by Chelsey 
PHYSICS!!!HELP！！
At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*1065 J/kg.
asked by Lydia 
Geometry
The foot of a ladder is placed 6 feet from a wall. If the top of the ladder is 8 feet up on the wall, how long is the ladder?
asked by Christina 
Science
If you observe a change in an object's speed or direction, you are observing a change in its ______________. s) frame of reference b) velocity c) position d) momentum I am thinking it is b) VELOCITY, but I am not sure.
asked by Carly 
history
Who did the american cowboys learn their skills from during th late 19th century???
asked by tommy 
calculus
2. if the sum from n=1 to infinity of a(sub n) converges and a(sub n) does not =0, then the sun from n=1 to infinity of 1/(a(sub n)) diverges. ?????
asked by sarah 
Calculus
A man can swim 2km/h in still water. Find at what angle to the bank he must head if he wishes to swim directly across a river flowing at a speed of 1km/h. I don't understand how to find that.
asked by Anonymous 
english
I need help coming up with ideas for a doublevoiced poem (aka: poem for two voices)?
asked by ashlee 
Chem
Does adding a catalyst to a rxn mixture add energy that causes the rxn to proceed more quickly. I answered: No, a catalyst simply lowers the activation energy by providing an alternate route to the desired product allowing the rxn to speed up. Does that
asked by Anonymous 
Math
why a ()x()=(+) ()x(+)= ()
asked by Amanda 
calculus
determine whether the series is convergent if so find sum: the sum of x=3 to infinity of (k+1)^2/((x1)(x2)) is it infinity meaning it diverges?
asked by sarah 
calculus
true of false if the sum of asubn from n=1 to infinity converges, and if a is not equal to 0, the the sum of 1/(a sub n) as n goes from 1 to infinity diverges.
asked by sarah 
Chemistry  DrBob222 please check and help
Can you check these? And I need help on one. Oxidation Number Method of Balancing Redox Reactions 1)Neutral Solution Sn^2+ + Fe^3+ > Fe^2+ + Sn^4+ Balanced equation Sn^2+ + 2Fe^3+ > 2Fe^2+ + Sn^4+ 2)Acidic Solution Fe^2+ + Cr2O7^2 > Cr^3+ +
asked by Alex 
Social Studies
I need to know about if Indiana is a mountanous or a prarie place, also about the land features like the elevation above sea level and places like lakes and mountains. If you also know anythingn about Indiana's Geography please give it to me. Also give me
asked by Peter 
American History
Why didn't the Dawes Severalty Act succeed/work?
asked by Rita 
history
How did American social criticism, imaginative writing, and are all relate to the urban industrialization changes of the late 19th century?
asked by bill 
Trigonometry
2 questions: An airplane takes off from the ground and reaches a height of 500 feet after flying 2 miles. Given the formula H=dtan times theta, where H is the height of the plane and d is the distance (along the ground) the plane has flown, find the angle
asked by Anonymous 
AED
School is the only common institution where all students can be touched about tolerance . i need help finding nfo on this
asked by Dawn 
Algebra
Find the exact solution(s) of the system: x^2/4y^2=1 and x=y^2+1 A)(4,sqrt3),(4,sqrt3),(4,sqrt3),(4,sqrt3) B)(4,sqrt3),(4,sqrt3) C)(2,1),(2,1),(4,sqrt3),(4,sqrt3) D)(4,sqrt3),(4,sqrt3) I don't know
asked by Jon 
math studies (survey)
This is for a school project, therefore I consider it "homework help." Off the top of your head, try to name: 1. The six American idol winners 2. Six American vice presidents that did NOT become president (current one counts) Don't cheat please! Thanks!
asked by Danny 
Science
The role of protein in hormone/enzyme functions? How protein assists with immunity? The protein needs of an infant or toddler compared to an adult? The importance of protein in maintaining fluid/electrolyte and pH balance? Amino acids and how they relate
asked by Allison 
History
HOW AND WHY DID WARFARE CHANGE IN THE 20TH CENTURY?
asked by J 
ACCOUNTI NG
State how you would expect the following events to affect each type of lag: a. The company imposes a service charge on late payments. b. A recession causes customers to be short of cash. c. The company changes its terms from net 10 to net 20.
asked by James 
World Geography URGENT!
What are the main economic activities for Switzerland?
asked by Lisa 
Science
What are some challenges using and managing renewable energy resources? What are the challenges with managing nonrenewable energy resources?
asked by Anonymous 
math
35 yrs ago babies are born here hospital celebrated the births of the last baby of feb 20th and the 1st baby of feb 21st w/gifts. 5 mothers including mrs keating were in labor as of midnight find the full name of each newborn 1 of the 1st name is crystal
asked by latisha 
business law
CASE PROBLEM: Three brothers inherited a small papersupply business from their father, who had operated the business as a sole proprietorship. The brothers decided to incorporate under the name Miwa Corp. and retained an attorney to draw up the necessary
asked by Bryan 
EARTH SCINCE
HOW WERE THE LARGE CANYONS ON MARS THOUGHT TO HAVE BEEN FORMED?
asked by FANNY 
spanish help
lucky y Rento/venir/a tu casa/para escuchar musica combine and create a sentence conjugating the verbs venien Luke y Lucky a tu casa para escuchar musica
asked by sam 
german
NEED A GERMAN RESTURANT NAME
asked by FANNY 
science
what is O2??
asked by beth 
history
Who did the native people of Ecuador mix with? Like what other cultures? And if there is a website, can I see it please so I can write some info? Also, who were the native people of Ecuador called? Different websites are giving me more than one group of
asked by Carol 
forms of words
can someone give me the noun form of peripheral? Chri
asked by Chris 
Phil/251
What Fallacy is this statement? We can recognize that althletes that participate in sports must be given special consideration within our grading system, or we can let the university sink into althletic oblivion.
asked by Thomas Jackson 
SCI
What are some challenges using and managing renewable energy resources? What are the challenges with managing nonrenewable energy resources?
asked by Anonymous 
Agricultural Science
Please give me sites to do with the Texel, Suffolk, Border LIecester and Dorset Horn Sheep
asked by Luciell 
biology
What are the four basic subunits for each of the four major categories of biochemcials? Better yet... what are the four major categories of biochemicals?! Please help, I can't find the answer anywhere!
asked by Chelsea 
literature
hi,there! i need a literary analysis of rubaiyat by omar khayyam...please help me...
asked by klar maesen 
Pre Algebra
This is about Reasoning Strategy... It says this: 3a. What is the yintercept of the trend line? 3c. Write an equation for the trend line in slopeintercept form. I don't really know what they mean? Please help me.
asked by Mathilde 
spanish help
Thad y Lorenzo/preferir/salir/con sus amigas Thad y Lorenzo preferien salir con sus amigas is this correct????
asked by sam 
physics.
a 1500W thing heats 1.5kg of water from 18C 59C in 3 minutes. how mcuh energy was used by the thing? how much energy was delivered to the waterr??
asked by physics..... 
statistics
sigma is the standard deviation of a population of size N S is the standard deviation of a sample of size n from within the population. What is the estimated value of S^2? If the population was infinitely large (size N = infinity), what would the estimated
asked by mathstudent 
spanish help
Podemos almorzar con lori y Roberto is this correct Nostotros/poder/almorzar/con Lori y Roberto
asked by sam 
Math
Find the inverse of f(x)= (x3)/(x+2) and f(x)= (8x4)/(2x+6).
asked by Danielle 
math
Elesia ets 9 bananas 4 apples and 9 mangoes a week.How many mangoes does she eat in 8 weeks
asked by Sana 
Calculus
prove: if z is a complex number 1/2= the conjugate of z of the absolute value of z squared.
asked by Courtney 
Math
A rectangular swimming pool that is 12ft by 15 ft has a deck of uniform width built around it. If the area of the deck is 198 square feet, find its width.
asked by Christina 
Problem Solving
Carl is trying to find a combination. It's written in a riddle. Find 2/3 of the final number, add 16, and this number will equal two times the mystery number. What was the final number of the combination?
asked by Paul 
geometery
Samantha has a dog that loves to chase flying disks. To keep her disk sperate form other disks, Samantha painted a triangle on it, with one point of the triangle in the center of the disk. As she throws the disk for the dog, what two transformations does
asked by alexis 
Math
Find the exact solution(s) of the system: x^2/4y^2=1 and x=y^2+1 A)(4,sqrt3),(4,sqrt3),(4,sqrt3),(4,sqrt3) B)(4,sqrt3),(4,sqrt3) C)(2,1),(2,1),(4,sqrt3),(4,sqrt3) D)(4,sqrt3),(4,sqrt3)
asked by Jon 
Managerial Economics
what are the different profit theories?
asked by Chidambar 
geometry
Samantha has a dog that loves to chase flying disks. To keep her disk sperate form other disks, Samantha painted a triangle on it, with one point of the triangle in the center of the disk. As she throws the disk for the dog, what two transformations does
asked by alexis 
physics
What is the difference between free fall and Skydiving
asked by Anonymous 
CHEMISTRY
could you please check my work? thanks. For the reaction between reactants A and B below, if 4.925 moles of A is placed into a flask with excess B it is found that the amount of A remaining after 6.85 seconds is 2.737 moles. 2A (g) + B (g)> 3 C (g) a.
asked by Jonathan 
earth
How does time affect crystals?
asked by mattie 
science
Which properties are most useful to identify a mineral? Explain
asked by mattie 
French translation
Découvir en donnant Et donner en découvrant Tu trouveras ta place au coeur des tiens Discover while giving, give while discovering, you will find you place in your(singular???) hearts. And another question. How would one say "I like that a lot" or "I
asked by Supaman 
English J.B.
In the book J.B. by Archbald MacLeish, can anyone help me find metaphors and explain them. Thanks
asked by John 
American Hstory
Describe the Monroe Doctrine and Roosevelt Corollary, how they are connected, and how the statements have shaped American foreign policy.
asked by Arielys 
American History
Discuss actions of the U.S. Government toward Native Americans from the colonial period until 1890. Describe three specific events or issues that demonstrate the Government attitude and desires. Question 68 answers
asked by Arielle 
calculus
i have to determine whether the series is convergent, and if, find the sum the series is from k=1 to infinity of 2/((k+1)(k+3)) I got 5/6 as my answer and didn't know if it was right...
asked by sarah 
calculus
Another problem: determine whether the series is convergent if so find sum it is the sum from k=1 to infinity of ((1)^k)/(3^(k+1)) i found this series to be geometric where a=1/9 and r=1/3 my answer was converges to 1/6
asked by sarah 
precalc
what does multiplying a complex number by a real number do to its polar representation?
asked by Lindsay 
Chemistry  DrBob222 please check and help
Can you check these? And I need help on one. Oxidation Number Method of Balancing Redox Reactions 1)Neutral Solution Sn^2+ + Fe^3+ > Fe^2+ + Sn^4+ Balanced equation Sn^2+ + 2Fe^3+ > 2Fe^2+ + Sn^4+ 2)Acidic Solution Fe^2+ + Cr2O7^2 > Cr^3+ +
asked by Alex 
Calculus
prove: if z is a complex number and 1/z=the conjugate of z over the absolute value of z squared.
asked by Courtney 
physics
A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a block (M = 2.30 kg) supported by two light strings as shown, stopping quickly. Find the height to which the block rises. and Find the angle (in degrees) through which the block rises,
asked by Courtney 
calculus
TRUE OR FALSE 1. if the lim as n>infinity of a(sub n)=0, then the sum from n=1 to infinity of a(sub n) converges i said this was true because I know that if a (sub n) does NOT=0, it diverges 2. if the sum from n=1 to infinity of a(sub n) converges and
asked by sarah 
calculus
find if the series is convergent and what it sums to the sum from k=3 to infinity of (k+1)^2/((k1)(K2)) I'm not sure how to start
asked by sarah 
physics
A Princeton prof. (mass = 70.0 kg), surprised by the large stopping force he calculates for jumping flat footed from a height of 0.12 m, decides to try the experiment. Calculate he deceleration (in g's) if he stops in a distance of 0.36 cm. (Do not try
asked by Josh G. 
math
A tetherball is attached to the end of a 3meter rope. The rope is attached to a pole thatis 5 cm in diameter. Estimate the greatest number of timees the rope could rap around the pole. Use 3 for pi(3.14) to make your estimate.
asked by Deidra 
Psychology
How relevant is personality theory to the field of psychology? What percent of psychologists are currently working in the field of personality psychology?
asked by Christian 
criminal justice
Explain how a probation officer or parole officer benefits from an understanding of nonverbal communications when interviewing an offender or parolee. Include in your explanation a description of certain signs or behaviors that could “tip off” an
asked by sara 
Biology
Hi, i had a lot of trouble with this one: Explain the significance of the difference in color and its relationshiip to the convolutions. We are doing the brain so, maybe you can use that use to help me please, thanks
asked by Dick Rogers 
Discrete Math
1. Assume that n is a positive integer. Use the proof by contradiction method to prove: If 7n + 4 is an even integer then n is an even integer. 2. Prove: n is an even integer iff 7n + 4 is an even integer. (Note this is an if and only if (iff) statement.
asked by Math help 
science
why can't sound travel on the moon?
asked by Ilie 
algebra
i need help step by step instructions for 2 problems i got the rest but these 2 are harder 7q+2=11q8q 8(j3)=4j+9j14
asked by connie 
Science
You push a book on a table so that its velocity is constant. If the force that you apply is 15N. what is the force due to sliding friction? If you accelerate, so that the velocity is no longer constant is the force you are applying to the book greater or
asked by Jennifer 
Math
How do you solve (a+b)^2  (a+b)2?
asked by Vanessa 
Algebra
Write an equation for an ellipse if the endpoints of the major axis are at (8,1) and (8,1) and the endpoints of the minor axis are at (0,1) and (0,3). d= sqrt(x2x1)^2 +(y1y2)^2 d= sqrt(88)^2 + (11)^2 d= sqrt 16 + 0 d= sqrt 256 d= 16
asked by Jon 
english
ok so i am doing a poem on somebody that i would like to be if i was not me. I can not think of anybody. I know it is based on my interests and stuff but i still cant think of any. I like to play guitar and dance. does anybody know of any famous females
asked by Anonymous 
statistics
true/false test with 16 questions all answers are guessed what is the mean and std deviation can u tell me how to get the P(x) value
asked by NIck 
Science
If you observe a change in an object's speed or direction, you are observing a change in its___________. a) frame of reference b) velocity c) position d) momentum I think it is VELOCITY, but I am not too sure
asked by Carly 
calculus
determine whether the series is convergent if so find sum it is the sum from k=1 to infinity of ((1)^k)/(3^(k+1)) i found this series to be geometric where a=1/9 and r=1/3 my answer was converges to 1/6
asked by sarah 
Geometry
A rectangular swimming pool that is 12ft by 15 ft has a deck of uniform width built around it. If the area of the deck is 198 square feet, find its width.
asked by Christina 
Grammar
We should hire a younger person who knows more about technology.
asked by Anonymous 
french
what is the difference between all of these? nouveau, nouvel, nouvelle, neuf
asked by michelle 
Soc. Studies
I need a good image of the Revolutionary War that shows a wide area. Can you help me?
asked by BinhAn 
science
what part of the skeleton protects your heart?
asked by JAMBER 
algebra
simplify 23sqrt(32x^2)2sqrt(50x^4)
asked by becky 
Social Studies
What dynasty, running from the 15th to 20th centuries, was supported by Pop Gregory having Rudolph I as its first emperor?
asked by Taylor 
economics
Identify similarities and differences between common goods, public goods, private goods, and natural monopolies. Provide an example of each type of good and justify your answers. Discuss possible positive or negative externalities associated with each
asked by Lisa 
Health
What is the main function of the endocrine system?
asked by Meli 
algebra
can someone help me with the steps to problem below, the fractions are throwing me off 5/8t+2/15t=17/20
asked by katherine 
algebra
Damon, the problem in the book is 5/8*t + 2/15*t = 17/20
asked by katherine 
Websites?
Where can i get opinions on stuff? Because i want to know which is a better name for a betta. Samson or Comet.
asked by Sam 
Chemistry
Can someone balance this equation using the halfreaction equation method? OF2 + I^ > F^ + I3^
asked by Anonymous 
chemistry
Is there a salt bridge in a fuel cell? I think there isn't one because hydroxide ions and hydrogen ions are in the water, so they can move around freely already.
asked by william 
Chem
Which of the following rxns would most likely occur the fastest? A. 2AgNO3(aq) + Cu (cr) > Cu(NO3)2(aq) + 2Ag(cr) B. NaCl(aq) + AgNO3(aq) > NaNO3(aq) + AgCl(cr) C. C6H12O6(aq) + O2(aq) > CO2(aq) + H2O(l) Only an answer is required, but a brief
asked by Anonymous