Friday
November 28, 2014

Posts by Emma


Total # Posts: 1,227

Physics
How much work is required to stop an electron (m = 9.11*10^-31 kg) which is moving with a speed of 1.50×106 m/s?
November 7, 2010

Chemistry...Help!!
Hey! So remember electron orbitals will fill up one by one. If you have Si notated by 3s2 3p2, you have 2 electrons that are unpaired, right? That means you can have 2 bonds. With P (3s2 3p3), you have 3 electrons that are each unpaired in the 3 p orbitals, so P can make 3 ...
November 6, 2010

Physics
In a very simple model of the lower atmosphere, air has a constant density of 1.25 kg/m3. How much would the air pressure change over a height difference of 260 m?
November 3, 2010

space
How many Earth Diameters would it take to reach the Sun 93,000,000 miles away?
November 2, 2010

physics
What is the magnitude of the apparent weight of a 69 kg astronaut 5200 km from the center of the Earth's Moon in a space vehicle moving at constant velocity?
October 29, 2010

physics
A 2100 kg car rounds a curve of 67 m banked at an angle of 13. If the car is traveling at 105 km/h, will a friction force be required? If so, in what direction?
October 29, 2010

math
4c+2=18
October 21, 2010

chemistry
What data would you need to evaluate the claim that a certain product neutralizes 47 times its weight in excess stomach acidity?
October 19, 2010

4th grade
what are the nouns in the sentence: Ryan will learn to swim this summer.
October 18, 2010

history
i know how to google
October 18, 2010

history
what was the battle of trafalgar?
October 18, 2010

history
what was the battle austerlitz?
October 18, 2010

history
what was napolean like in the north america?
October 18, 2010

history
how did napoleon declare himself emperor?
October 18, 2010

history
i know how to google, that's what i've been doing and i'm having no luck
October 18, 2010

history
you can edit it and change info on it, it's not reliable *i meant good not code
October 18, 2010

history
wikipedia isn't a code source
October 18, 2010

history
what was the napoleonic code?
October 18, 2010

arithmetic
what do you want?
October 18, 2010

Physics
Two men pull a 31-kg box with forces 9.7 N and 7.6 N. Find the resultant scceleration of the box.
October 16, 2010

Physics
A car mass of 1330 kg is traveling at 28.0 m/s. The driver applies the brakes to bring the car to a rest over a distance of 79.0 m. Calculate the retarding force.
October 16, 2010

spelling
go on dictionary . com (no spaces) it's really useful
October 14, 2010

History
i don't know, i mean, weren't all those people who died for the revolution? so if they didn't die, wouldn't it have gone a lot faster? and didn't they die for no real reason, i mean, they said one wrong thing and they weren't sent to be executed. did ...
October 14, 2010

History
was the Reign of Terror necessary to preserve the French Revolution?
October 14, 2010

math
the sum of the input and output equals 10, so it would be 10 for the output of 0
October 14, 2010

Math
find the greatest four-digit number that has exactly three positive factors.
October 14, 2010

ap chem
so is this correct: 3330000 grams CH4 0 grams O2 1770833 grams NH3
October 11, 2010

ap chem
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen and methane: 2NH3(g) + 3O2(g) + 2CH4 -->2HCN + 6H2O(g) a)If 5.00 x 10^3 kg each of NH3 , O2, and CH4 are reacted what mass of HCN will be produced, assuming 100% yield? b)At the end of ...
October 11, 2010

Chemistry
The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
October 11, 2010

AP Chemistry
HELP! We're currently studying gases but I dont even know where to start with this question.
October 11, 2010

AP Chemistry
The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
October 11, 2010

math
659 x 1357=1357 x n n=
October 6, 2010

math
6+y=17
October 6, 2010

algebra
1/6h=9
October 6, 2010

Math
I don't get how you found the solution. Also I am the first one to post part b) and I dont get how to do it.
October 2, 2010

Math
When a concrete structure is built, an engineer often performs a slump test on the concrete to ensure that it is of suitable strength and consistency. The engineer fills a truncated cone with a bottom diameter 200mm, top diameter 100mm and height 300mm with concrete. The ...
October 2, 2010

math problem
When a concrete structure is built, an engineer often performs a slump test on the concrete to ensure that it is of suitable strength and consistency. The engineer fills a truncated cone with a bottom diameter 200mm, top diameter 100mm and height 300mm with concrete. The ...
September 30, 2010

math-bobpursely
Sorry bobpursely, but may I know what the E stands for in your formula? What is the Surface area of a glass bead that has the diameter of 11m? Express your answer to the nearest square mm. radius= .0055m radius^2= 5.5E-3 ^ 2=30.25 E-6m 4PIr^2= about 12*30.25E-6 m
September 30, 2010

math
What is the Surface area of a glass bead that has the diameter of 11m? Express your answer to the nearest square mm. A glass bead would be a sphere. So the formula for that is--> SA = 4ðr^2 = 4ð(5.5^2) = 380mm^2
September 30, 2010

math problem
When a concrete structure is built, an engineer often performs a slump test on the concrete to ensure that it is of suitable strength and consistency. The engineer fills a truncated cone with a bottom diameter 200mm, top diameter 100mm and height 300mm with concrete. The ...
September 30, 2010

health
what brings energy and oxygen into the body?
September 29, 2010

math
6r-3=15
September 28, 2010

math
7d+5=26
September 28, 2010

physics
A golfer takes three putts to get the ball into the hole. The first putt displaces the ball 15 ft north, the second 9.0 ft southeast, and the third 5.0 ft southwest. What displacement was needed to get the ball into the hole on the first putt?
September 26, 2010

phsics
so the magnitude will be the same and you have to add 180 degrees to the the original angle right..
September 23, 2010

phsics
I'm having some trouble with a question how do you find a vector that balances another one
September 23, 2010

english
Give 5 similaralities between spoken language and text/instant messaging
September 23, 2010

math
the length of a rectangle is 9in. greater than the width.the area 36in.2 find the dimensions
September 22, 2010

math
the length of a rectangle is 9in. greater than the width.the area 36in.2 find the dimensions
September 22, 2010

Algebra
you have to do long division i got x-9 as the answer
September 21, 2010

physics
An artillery shell is launched on a flat, horizontal field at an angle of α = 31.5° with respect to the horizontal and with an initial speed of v0 = 266 m/s. What is the horizontal distance covered by the shell after 9.44 s of flight?
September 21, 2010

physic
The velocity vector V1 has a magnitude of 3.0 m/s and is directed along the +x-axis. The velocity vector V2 has a magnitude of 2.0 m/s. The sum of the two is V3, so that V3 = V1+V2 true or false for each question The magnitude of V3 can be -3.0 m/s The x-component of V3 can be...
September 21, 2010

chemistry
what happens when you cool biodiesel. petroleum-based diesel fuel, and vegetable oil?
September 19, 2010

Biology
Populations are frequently NOT in equilibrium due to selection or other evolutionary forces. Imagine a population of 100 individuals. Forty-nine of the individuals are homozygous dominant for beady-eye gene, 9 are heterozygous and 42 are homozygous recessive. NOTE: The ...
September 18, 2010

physics
The speed limit in a school zone is 38 km/h. A driver traveling at this speed sees a child run onto the road 16 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 8.5 m/s2. If the driver's reaction time is 0.55 s, What is the stopping ...
September 6, 2010

English
What is the proper name used when using improper words. ie rootin' tootin'?
August 25, 2010

math
"ThermoStar has been producing residential thermostats for over 50 years. Looking over the past 20 quarters (5 years) of the different product lines, the general manager has been trying to get a handle on sales, costs, and production, and has asked for your help. Your ...
August 5, 2010

Statistics
Car P(Sale) % Sold Per Sale/ Profit Per Sale VW Golf 10% 15% $1,000 Saab 10% 15% $2,000 BWM Z4 10% 20% $12,000 Skoda Octavia10% 10% $1,200 Lada Niva10% 40% $400 Sum 100% 2.1 What is the expected profit for a VW Golf? 2.2 What is the expected profit for a Saab? 2.3 What is the...
July 27, 2010

american government
there are five main principles that form the basis of rules that ensure our democratic government. discuss each and present an example that shows how our government is not obeying each principle
July 20, 2010

Chemistry
How were you able to get the 1.6?
June 24, 2010

Chemistry
Prepare a 0.0200 mM dye solution at low pH by dilution 0.40 ml of the stock 0.100 mM chemical X into the appropriate volume of 2.5 M HCl. What is the amount of HCL required for dilution, the final concentration of HCl in the solution, and the pH? I know there's the MV = MV...
June 24, 2010

english
what does being perfect mean?
June 16, 2010

Career Studies
Hi, I have to do a visual presentation on a current economic or social trend. I'm not allowed to use bristol board/posters or powerpoint/slideshows, because she wants us to be creative. What are some trends I could choose from, and what kind of presentation could I ...
June 14, 2010

chemistry
What is the purpose of removing all the precipitate from inside a beaker?
May 27, 2010

chemistry
What is the purpose of removing all the precipitate from inside a beaker?
May 27, 2010

Chemistry
What is the number of moles present in 24.0 mL of 0.500M solution of sodium chloride, NaCl? How many moles are there in 456 g of calcium fluoride, CaF2?
May 27, 2010

chem can u check answer please
I'm not ure that that is right... [H+] = -log(pH) however, we are given a pOH, not a pH. pH + pOH = 14 pH = 14 - pOH so 14 - 9.262 = pH pH = 4.738 [H+} = 10^-ph = 10^-4.738 [H+] = 1.8281 x 10^-5 M
May 23, 2010

calc
Three verticies of a parallelogram are D(2,1,3), E(-4,2,0) and F(6.-2,4). Find all possible locations of the fourth vertex.
May 23, 2010

Pre Algebra
Transversals?
May 21, 2010

7th grade
what is 1.4 to the 11th power
May 20, 2010

english
is this sentence clean she buyed some dounuts from the shop she boght some donuts from the shop.
May 3, 2010

math
3.75qt= qt c
May 3, 2010

english
does this sentence makes sens she flied over the mountaintop.
May 2, 2010

Chemistry
A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery is 2.83V with the standard voltage at 2.71V. ...
May 2, 2010

english
does this sentence make sesse. he ate a apple.
May 2, 2010

college economics
Suppose there are two goods. The demand for good 1 is q1=a-bp1+ep2 and the demand for good two is q2=a-bp2+ep1. a and b are strictly positive, |e|<b (1)Compute the optimal prices, and the Lerner index and inverse elasticity of demand for each good. (2)Now suppose the goods ...
May 2, 2010

economics
Suppose there are two goods. The demand for good 1 is q1=a-bp1+ep2 and the demand for good two is q2=a-bp2+ep1. a and b are strictly positive, |e|<b (1)Compute the optimal prices, and the Lerner index and inverse elasticity of demand for each good. (2)Now suppose the goods ...
May 2, 2010

Chemistry
A voltaic cell consists of a Pb /Pb^2+ half-cell and a Cu/Cu^2 half-cell at 298K. The initial concentrations of Pb^2+ and Cu^2 are 5.20×10−2 M and 1.40 M, respectively.
April 28, 2010

english
What changes have you seen in your lifetime with regard to people's attitude towards the environment?
April 28, 2010

Chemistry Dipole Moments
How do you tell which end of a polar bond is positive or negative? My book says that a molecule such as Hf has a center of positive charge a center of negative charge. But in S--O, how do you tell which end is positive, and which is negative.
April 12, 2010

trig
which of the following sets gives the x coordinates where the parabola y=x^2+4X-50 and the line y=7x-10 intersect when drawn in the coordinate plane
April 4, 2010

trig
which of the following sets gives the x coordinates where the parabola y=x^2+4X-50 and the line y=7x-10 intersect when drawn in the coordinate plane
April 4, 2010

Reading
Just gold eggs in a story that contain snakes, bees, and wolves.
April 4, 2010

Reading
Why would eggs containing terrible things, are so beautiful on the the outside and eggs containing beautiful things, are plain on the outside?
April 4, 2010

Reading
Who's point of view is it from, if it's not any of the character's point of view?
April 4, 2010

Reading
Why is magic important in folktales?
April 4, 2010

science
What is the storm on Jupiter?
March 31, 2010

Chemistry
it doesn't say :(. that's the problem word-for-word
March 28, 2010

Chemistry
.12M Lactic Acid (HC3H5O3, Ka=1.4x10^-4) is mixed with .10M NaC3H5O3 to form 1.00L solution. A. Calculate the pH of the solution after the addition of 50.0mL of 1.00M NaOH. B. Calculate the pH of the solution after the addition of 120.0mL of 1.00M NaOH.
March 28, 2010

math
X=10 so 10-8 would equal 2 and so y=2
March 25, 2010

7th grade
9.75 feet
March 18, 2010

teasers
i have streets but nopavemet i have cities but no bulidings i have rivers yet no water what am i
March 16, 2010

math
Which value of 'x' is the solution of the equation 2x/3 + x/6 = 5?
March 15, 2010

math
It takes Tammy 45 minutes to ride her bike 5 miles. At this rate, how long will it take her to ride 8 miles?
March 15, 2010

psy 210 HHHEEEEEELLLLPPPPP PLEASE!!!
hello, are u here
March 14, 2010

Muffins and Teeth in your Ears
Ear defenders are like ear muffs they are made of muffins which can help with helping you to stop you getting tooth in your ear drum (Fun Fact--- I did not just make that all up there really are teeth in your ear drums!)
March 10, 2010

physics
a basketball of mass 0.5 kg is dropped from restfrom a height of 1.34m.it rebounds to a height of 0.6m. how much mechanicalenergy was lost during the collision with the floor?
March 8, 2010

math
how do you solve 8-3x=the square root of 4xsquared+ the square root of 20 + 8
March 2, 2010

Math
If a diamond shape = 2/3 how do you draw 1/3, 1, 4/3, 2 thanks
March 1, 2010

Geometry
Hi, I don't have much time to turn this in. I think I got all the questions right, but I just want to be sure. I would appreciate some feedback! Thank you! 1. What is the formula for calculating the length of the diagonal of a right rectangular prism on the basis of the ...
February 25, 2010

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