Saturday
February 6, 2016

# Posts by Lauren

Total # Posts: 1,724

Physics
You often see birds resting on power lines that carry currents of 50A. the copper wire on which the bird stands has a radius of 1.1cm. assuming the birds feet are 4.0 cm apart, calculate the potential difference across its body... -------- V=IR R=pL/A I=50A L=4.0cm p=from ...
April 14, 2010

calculus
the limit from n->infinity of the summation of [2+(3/n)k]^2(3/n) when k=1
April 13, 2010

chemistry
a 500.0 g sample of h2o2 conatins 31.50% h2o2 by mass find the mass of water in the solution
April 12, 2010

math
I'm doing solving quadratic equations.I need help with couple of problems. k(k+5)=0,4r^2=100
April 7, 2010

Physics
A particle of mass m moving at 5 m/s in the positive x direction makes a glancing elastic collision with a particle of mass 2m that is at rest before the collision. After the collision, m moves off at an angle of 45 degrees to the x axis and 2m moves off at 60 degrees to the x...
April 6, 2010

computers
Explain what the Easter eggs in microsoft are? They are like hidden messages right? Why do they put them in there? Can they still put them in there? Why would they want to do put hidden messagesin their programs. Where can I find out more inmformation?
April 5, 2010

social studies
how is the iroquois confederacy diff. from the colonial government?
March 25, 2010

social studies
comapare and contrast the Irouquios confederacy and the colonial government.
March 25, 2010

Math
A set of scores with a normal distribution has a mean of 32 and a standard deviation of 3.7. Which score could be expected to occur the least often?
March 25, 2010

what happened to Rome after the Punic Wars?
March 24, 2010

algebra
-4x^2-18x+10
March 23, 2010

math
March 17, 2010

math
Erin takes a total of 5 hours in her boat to travel a distance upriver and return downriver the same distance. If the time traveling upriver is twice the time traveling downriver, how many hours does each trip take? How do I put this into two equation and use the matrix to ...
March 16, 2010

chemistry
How many grams of CH4 are needed to react with 160.0 grams of Br2
March 15, 2010

physics
Gold ions (Au+) are accelerate to high speeds using electric fields. These ions are then passed through a region where uniform electric E and magnetic B fields are present. If the ions are traveling to the right, which configuration of E and B will serve as a velocity selector...
March 13, 2010

algebra
hi I need help with it!!!! HELP!!!!!
March 13, 2010

math
x^2-8x+16
March 12, 2010

physics
thank you!
March 7, 2010

physics
Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The dielectric strength for a...
March 7, 2010

PHYSICS
A rectangular piece of gold is 3.6 cm long and 3.5 cm wide. How deep is the piece when it displays a resistance of R = 1.51 ìù for a current that flows along the depth-direction? --- p is found in a table...right? and then.. R=pl/A R=pl/(2dw+2wl+2dl) then solve ...
March 7, 2010

American History
New England factories were initially located in the countryside because? Why
March 7, 2010

western civilization
Judaism and Islam shere the belief that ________?
March 7, 2010

Chem = )
Write the complete ionic equation for BaCl2 + NaOH ----> Al2(SO4)3 + BaCl2 ---> Al2(SO4)3 + NaOH ---> NaOH + Zn(No3)2 ---> BaCl2 + NaI --->
March 3, 2010

ALBERGA
Find the value of y 3x-2y=6,x=2+3y
March 1, 2010

Physics
At what distance from a carbon nucleus is the electric potential 1.8 V? Carbon atoms have 6 electrons in the atomic shell ...im very confused with this question, please help!
February 28, 2010

chemistry
A 2.500 gram sample of hydrate of calcium sulfate loses 0.532 grams of water when heated. Determine the mass percent of water in the hydrate and the formula of the hydrate.
February 27, 2010

Physics
An electron enters a parallel plate apparatus 10.0cm long and 2.0cm wide, moving horizontally at 8.0 × 10^7 m/s. (top plate is positive, electron is 1.0cm from each plate..) The potential difference between the plates is 6.0 × 10^2 V. Calculate... (a) the vertical ...
February 26, 2010

math
482 multiplied by 8,624,798,324.287
February 26, 2010

physics
How much kinetic energy is gained by an electron that is allowed to move freely through a potential difference of 2.5 × 104 V?
February 24, 2010

Physics
A 1.0 × 10−6 C test charge is 40.0cm from a 3.2 × 10−3 C charged sphere. How much work was required to move it there from a point 1.0 × 102 cm away from the sphere? what formula(s) should be used to calculate work...?
February 24, 2010

PHYSICS
Humid air breaks down electrically when its molecules become ionized. this happend in an electric field |E|=3*10^6 N/C. In that field, calculate the magnitude of the electric force on an ion with a single positive charge. ..when they say a single positive charge do they mean +...
February 24, 2010

math
bill is 6
February 24, 2010

Chem
Give the ideal bond angle for BrO3- ion? I know this has trigonal bipyramidal geometry and therefore the bond angle is < 109.5. Is there a way to determine a more specific bond angle?
February 12, 2010

Chem
How many sigma bonds are there in trypophan? I know the answer is 28 but I don't know how to get that answer. Can someone please explain?? Thanks!
February 12, 2010

Chemistry
What is the product of Bromo Blue, CaCl2 (calcuim cloride) and NaHCO3 (baking soda)?
February 5, 2010

Pre Cal
1 --------- 2x^2-2 --------------- 2 + x ---- ------- x+11 x^2-2x-3
January 29, 2010

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol) for ...
January 25, 2010

chemistry
What is the vapor pressure of CS2(in mmHg) at 18.5degree C? Carbon disulfide, CS2, has Pvap= 100mm at -5.1 degree C and change in Hvap = 28.0 kj/mol .
January 25, 2010

chemistry
At what temperature (in degrees C) does acetone have Pvap= 102 mmHg?
January 25, 2010

I need help in creating 3 Math problems that has to do with Baseball. Does anyone know how to or websites to help me...
January 25, 2010

Math
It wasn't me. I don't understand how to do the entire thing.
January 23, 2010

Math
How would you explain how to do this problem step by step in words? The answer is suppose to be 43/128 11/16-(-3/4)^2/2^3/5
January 23, 2010

Math
A marching band has 88 students. If the band limits the group to marching in 11 rows, how many students will march in each row?
January 23, 2010

math
on a centemeter ruler where is .13 m?
January 21, 2010

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol)for ...
January 20, 2010

physics
lots of questions 1) a 2N and 6N force pull on an object to the right and a 4N force pulls to the left a 0.5 kg object what is the net force on the object 2)a 20mkg bike accelerates at 10m/s2 with what force was the person pedaling 3)if a person is pushing a cart with a force ...
January 15, 2010

physics
if a person pulls on a cart to the right with a force of 10N and a second person pulls to the left with a force of 3N what is the net force (+ direction)on the cart
January 15, 2010

physics
a sled is being pulled to the left by 5 dogs, each dog pulling with 6 newtons of force what is the net force
January 15, 2010

science
When a truck pulls a trailer, the trailer and the truck acclerate forward even though the action and reaction forces are the same size but are in opposite direction. Why don't these force balance each other
January 12, 2010

algebra 9
January 7, 2010

chemistry
A 2 x 10^-3 M solution of MnSO4 is gradually made more basic by adding NaOH. At what pH will manganese(II) hydroxide begin to precipitate? [Ksp of Mn(OH)2=2 x 10^-13]
December 18, 2009

math
How many liters are contained in a cube with each edge 1m? HOW do you do this? How do I know how many liters fits into a meter?
December 16, 2009

math
A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.
December 16, 2009

math
The two cereal boxes shown have corresponding edges in a ratio of 2:3.If the smaller box sells for \$2.50 and the larger box for \$4.00, which is the better buy? Why? What assumption(s) do you have to make when solving the problem? Estimate, then check. I think the answer is the...
December 16, 2009

math
A cylindrical can of cleaner holds 1 L of liquid. What is its height if the diameter of the base is 10 cm? How do I do this? I need to show my work AND I need to understand how to do it.
December 16, 2009

math
So does 166.28 sound about right? I don't have any examples to base the answer against, so I am very leery of this.
December 16, 2009

math
How do I find out on a standard calculator what this is: A=1/2 (4 3 )(48) It's supposed to read 4 square root 3 I don't even know how to input this into my calculator. Can someone tell me how? thanks!
December 16, 2009

Physics
A girl kicks her soccer ball with a velocity of 2m/s at an angle of 40 degrees with the horizontal. what is the total time? what is the ranger? and what is the max height of the ball?
December 16, 2009

geometry/math
How do I find the area and perimeter of a square when all I'm given is a diaganol line cutting the square into two equal halves, with the length of the line being 6square root2, and the angles of the square are all 90 degrees, with the angle bisected by the line being 45 ...
December 16, 2009

spanish
are these sentances correct? Las jirafas con los cuellos cortos vio la jirafa con el cuello largo. Las jirafas con los cuellos cortos pensaban que un largo cuello es muy guapo. Quisieron tener largos cuellos también. Las jirafas fueron a Frank. Esperan que él ...
December 15, 2009

english
What are the differences and similarities between Modernism to Postmodernism. I get confused between these two.
December 15, 2009

math/geometry
a. Describe the different types of planes of symmetry and axes of symmetry of a regular octahedron. b. How many planes and axes of symmetry does a regular octahedron have? c. Make a sketch and compare the symmetry properties of a regular octahedron and a cube.
December 12, 2009

geometry
Why is it impossible for a regular polygon with more than six sides to tesselate the plane? I know it has something to do with the angles, but I'm not sure what to write for this. 3 hexagons tesselate the plane and they have angles at 120, but why can't an octagon? Why...
December 12, 2009

algbera
which ordered pair is a solution of the equation ? 3x+y=0 A.(-1,3) B.(3,-2)c.(-2,3) D.(3,-1)
December 9, 2009

Economics
This is what I've come up w/ so far... I just need to expand a bit.... Artificial supply creates artificial demand. Coupons don't work because the supply is not market driven. What they create is a black market. The value of coupons is inevitably to be determined by ...
December 8, 2009

Economics
How does a price ceiling undermine the rationing function of market-determined prices? How could rationing coupons insure that consumers with the highest values get the limited amount of a good supplied when government price ceilings create shortages? Fully explain your answer...
December 8, 2009

science
Chemical reaction
December 7, 2009

U.S History
Each quote is either from the Constitution (what part of it?) or the Bill of Rights (which amendment?) 1."He has endeavored to prevent the population of these states: for that purpose obstructing the Laws for Naturalization of Foreigners" 2."For cutting off our ...
December 7, 2009

statistic help pls
a car insurance company has determined that 6% of all drivers were involved in a car accident last year,among the 12 drivers living on one particular street,3 were involved a car accident last year.if 12 drivers are randomly selected what is the probability of getting 3 or ...
December 6, 2009

statistics
the participants in a television quiz show are picked from a large pool of applicants with approximately equal number of men and women.Among the last 11 participant there have been only 2 women.If participants are picked randomly,what is the probability of getting 2 or fewer ...
December 6, 2009

statistics
an airline estimates that 97%of people booked on their flights actually show up.if the airline books 70 people on a flight for which the maximum number is 68,what is the probability that the number of people who show up will exceed the capacity of theplane
December 5, 2009

to reiny
so would my equation be: d^2 + 3^2=6^2 d^2 + 9=36 d^2=27 d=square root of 27? d=5.197 or 5.2?
December 5, 2009

math/geometry
complete the statements: To find the length of the hypotenuse of a 45-45-90 triangle, multiply the length of one of the legs by:? Could the answer be .5??? to find the length of the shorter leg of a 30-60-90 triangle, multiply the length of the longer leg by:? To find the ...
December 5, 2009

geometry again
I have a pic of a right square pyramid with equilateral triangular faces with each side of the triangle measuring 6 in. i have a line "d" intersecting one of the triangles making 2 right angle triangles. Using the pythagoream theory- how do I find the distance d? I ...
December 5, 2009

geometry
The skipper of a boat knows that the water is too shallow to bring his boat inside a "danger semicircle" that goes from lighthouse to lighthouse. How can the angle between his sightings of the two lighthouses help him decide when he is entering the danger zone? How ...
December 5, 2009

re: geometry
The boat is outside of the semicircle. So how can his angle help him decide when he is entering the dangerous semicircle? is there a certain theory that this pertains to? I still don't understand. Please, help again? thanks
December 5, 2009

geometry
The skipper of a boat knows that the water is too shallow to bring his boat inside a "danger semicircle" that goes from lighthouse to lighthouse. How can the angle between his sightings of the two lighthouses help him decide when he is entering the danger zone? How ...
December 5, 2009

home economics
Teacher @ High School level Teacher at Vocational School Cook homemaker Cooking TV Show Host Martha Stewart/ Rachel Ray Book (Author like Emerald L) Host at a restaurant Personal Chef Seamstress Macy's sales person in home department Manager of Homegoods
December 4, 2009

physics
if a block of wood dropped from a building has attained a velocity of 78 m/s how long has it been falling?
December 2, 2009

math
how do you find domain and range for the problem f(x)=x cubed
December 2, 2009

college math
sam bought 1 of 250 tickets for \$2 in a raffle with the prize of \$400. Was \$2 fair price? Can someone show me the formula on how to get this answer. My text is super confusing.
December 1, 2009

Math
If you have 200 blocks and want to stack them in a solid shape, how many shapes can you stack them?
November 30, 2009

Physics
Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characeristic radiation characteristics?
November 23, 2009

physics
How does the mass of a nucleon compare with the mass of an electron?
November 23, 2009

college math
a bag contains 7 red chips and 9 blue chips. Two chips are selected randomly from the bag without replacement. What is the probability that the two chips are the same color? If someone could just point me in the right direction for the many equations I could use I would be ...
November 23, 2009

math
Babe Ruth's lifetime betting averge was .343. In three times at bat, what is the prbability of the following? a. he gets three hits b. he gets no hits c. he gets at least one hit. d. he gets exactly one hit
November 20, 2009

college math
a pair of dice are rolled and the sum is recorded. What is the probability that the sum shown is 8 given that one die is showing 5? Is this done correctly? P(8|5)=1/6 x 1/6= 1/36 I really just want to make sure I have done this the right way!
November 18, 2009

college math
Can someone just tell me the formula to use for this problem? Jack is taking a four item true/false test. He decides to flip a coin to answer. What is the probablility he gets a perfect score? What is the probablility on a 10 question test?
November 18, 2009

math
So I just multiply the probability of each ball on each turn? Thank you sooo much! Why can't the text just say that?
November 18, 2009

math
I have a question in my math class in college. Here is the question, but I just need help on HOW to answer it. My text isn't clear at all. A box contains 2 black balls and 3 gold balls. 2 balls are randomly drawn in succession. a.if there is no replacement, what is the ...
November 18, 2009

Physics
Describe the Bohr model of the atom. What is de Broglie's key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?
November 16, 2009

Physics
The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n^2, where n=1 labels the lowest or "ground" state, n=3 is the thrid state, and so on. If the atom's diameter is 1 x 10^(-10...
November 16, 2009

math
Henry's z-score on his reading test was 1.27. The class average was 60, the median was 58.5 and the variance was 6.2. What was Henry's "raw" score (his score before converting to z-scores)
November 11, 2009

Algebra 2
what is the answer to: -6psquared+11p+7=0 i'm confused...
November 11, 2009

Physics
How does the idea of magnetic fields arising from circulating currents relate to permanent magnets?
November 10, 2009

Physics
An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: Power suppled to the secondary?
November 10, 2009

Physics