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August 30, 2014

Posts by Sarah


Total # Posts: 3,839

Physics
Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed to collide into a tumor, killing the malignant cells. Suppose a proton accelerator is 4.21 m long and must accelerate protons from rest to a speed of ...
January 25, 2012

Chemistry
Calculate the energy (in kJ/mol) required to remove the electron in the ground state for each of the following one-electron species using the Bohr model. (a) He+ kJ/mol (b) Li2+ kJ/mol
January 24, 2012

Science
Oh and sorry, I forgot to say thank you and please.
January 24, 2012

Science
Is the meaning of an application in science 'how is it used in the real world'? Yes or No. If no, please write what the real definition is, in 6th grade language for me to understand.
January 24, 2012

Chemistry
Calculate the energy (in kJ/mol) required to remove the electron in the ground state for each of the following one-electron species using the Bohr model. (a) He+ kJ/mol (b) Li2+ kJ/mol
January 24, 2012

Chemistry
A certain microwave oven delivers 633 watts (J/s) of power to a coffee cup containing 53.1 g of water at 25°C. If the wavelength of microwaves in the oven is 9.75 cm, how long does it take, and how many photons must be absorbed, to make the water boil? The specific heat ...
January 23, 2012

physics
Two particles each with charge +2.68 µC are located on the x axis. One is at x = 1.00 m, and the other is at x = −1.00 m. (a) Determine the electric potential on the y axis at y = 0.660 m. (b) Calculate the change in electric potential energy of the system as a ...
January 22, 2012

Algebra
You are making a scale drawing of a sailboat using the scale 1 inch: 3 feet. The length of nthe sailboat at its longest point is 36 feet and the height is 54 feet.What should the lenght and height of the sailboat be in your drawing?
January 22, 2012

physics
A 200.0 kg astronaut and equipment move with a velocity of 2.00 m/s toward an orbiting spacecraft. The astronaut will fire a 100.0 N rocket backpack to stop his motion relative to the spacecraft. (a) What acceleration is attained by the rocket backpack?
January 22, 2012

physics
(a) What is the acceleration of a car in m/s² that doubles its speed from 36.0 km/h in 5.00 s? (b) What net force acted on this car if its mass was 1,000.0 kg?
January 22, 2012

physics
In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a straight-away at 66.5 m/s. The driver of the Thunderbird realizes that she must make a pit stop, and she smoothly slows to a stop over a distance of 250 m. She spends 5.00 s in ...
January 21, 2012

Math
There are twenty balls in the bag. Twelve are white, six are orange and two are pink. When I draw a ball from the bag, I remove it. What is the probability that my first draw is a white ball and my second is not?
January 20, 2012

Physics
A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 11 m/s when the hand is 1.8 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)
January 18, 2012

algebra
Solve the inequality. Express your solution using notation and please show all of your work. x^4<16x^2
January 18, 2012

algebra
Given the following function, find: (a) vertex (b) axis of symmetry (c) intercepts, (d) domain (e) range (f) intervals where the function is increasing, (g) intervals where the function is decreasing Please show all of your work f(x)=-7x^2-14x-3
January 18, 2012

algebra
yeah thanks
January 18, 2012

algebra
Given the equation x^2+y^2-8x-6y=0 (a.) Write the equation in standard form . (b.) State the center, radius, and intercepts.
January 18, 2012

algebra
Solve the following inequality and write answer using interval notation. Please show all of your work. 2x-5/3x^4-x^3+275x-125>=0
January 18, 2012

science
what are mass, matter, and volume and how are they related?
January 17, 2012

english realism and regionalism
3 questions for english??? Thank you!! In three to five sentences, explain how Ambrose Bierce's use of foreshadowing or flashback influence "An Occurrence at Owl Creek Bridge." (5 points) A. Regionalism is a form of Realism that emphasizes realistic settings, ...
January 16, 2012

Chemistry Problem!
Thanks a lot
January 16, 2012

Chemistry Problem!
What weight of sample containing 8.00 % Fe3O4 must be taken to obtain a precipitate of Fe(OH)3 that, when ignited to Fe2O3, weighs 150 mg?
January 16, 2012

Education
how should local schools respond to issues that might impact SEI instruction
January 16, 2012

chemistry
A helium balloon has a volume of 2.50L at STP. If it's released and rised to an elevation at which pressure is 0.285 atm, and the temperature is -35 degrees. What's the new volume?
January 15, 2012

Money
Thanks for the help. -Sarah
January 15, 2012

Money
It is possible for a company’s liabilities to exceed its assets. When this occurs, the owners’ equity is negative. Can this happen with market values? Why or why not? I thought that it would not happen since market value is the price that equity, liabilities, and ...
January 15, 2012

World History
d is the first i think second is a ?
January 14, 2012

World History
What was the cause of the peloponnesian war? A. Greeks sought revenge for the persian wars B. Sparta wanted control of the powerful athneian army C. Many greeks outside of athens resented athenian domination I got B. Around 700 B.C Athenians became unhappy with their form of ...
January 14, 2012

Physics
A streetcar named Desire travels between two stations 0.59 km apart. Leaving the first station, it accelerates for 10.0 s at 1.0 m/s2 and then travels at a constant speed until it is near the second station, when it brakes at 2.0 m/s2 in order to stop at the station. How long ...
January 14, 2012

World History
Both Hindus and buddhists believe in A. Many gods B.The caste system C. Formal rituals I got C.
January 13, 2012

spanish
please unscramble these spanish words " 1)cesla 2)utiels 3)asloresce 4)oclamih
January 13, 2012

World History
In the reading. What to do about the Christians?, the emperor trajan and pliny the Younger exchange legtters concerning the persercution of christians. From this exchange which of the following assumptions could NOT be made? A.Neither party knows much about the Christian ...
January 11, 2012

World History
In the reading. What to do about the Christians?, the emperor trajan and pliny the Younger exchange legtters concerning the persercution of christians. From this exchange which of the following assumptions could NOT be made? A.Neither party knows much about the Christian ...
January 11, 2012

Spanish
thanks, but i meant "toque" as in hat.
January 11, 2012

Spanish
How would I say "Where is your toque" in spanish. dónde está tu toque? not sure.
January 11, 2012

history
how do legalism and daoism differ? A)legalism emphasizes strict law and harsh punishment, and daoism emphasizes that a government that governs least is best. b)daiosm emphasizes personal salvation and leagalism emphasizes the a government that governs is least best. C)legalism...
January 10, 2012

Geometry Which Statement is True?
Which statement is true? All quadrilaterals are rectangles All quadrilaterals are squares All rectangles are quadrilaterals All quadrilaterals are parallelograms Thank You :)
January 10, 2012

World History
The effect of a new greek middle class emerging and challenging nobles for power was : A. Athenians appointed solon to make reforms B. A form of government called an olligarchy emerged C. The government moved toward democracy D. Economic reforms were introduced I got A. In the...
January 9, 2012

World History
How did the romans view greek culture, such as art, liturture, and philosophy, during the Greco-Roman period of civalization? A. The romans believed it was substandard B. The romans believed it will anger the gods and lead to mass distruction of there way of life C. The romans...
January 9, 2012

English
Yep, I go to connections too and it can be very stressful. So all you jerks that look down on us for trying to get answers online..... HELP US!
January 9, 2012

World history
How did the romans view greek culture, such as art, liturture, and philosophy, during the Greco-Roman period of civalization? A. The romans believed it was substandard B. The romans believed it will anger the gods and lead to mass distruction of there way of life C. The romans...
January 9, 2012

World Hisory
Which of the following reflects the influence of middle american civalization on North American culture ? A. Iroquois League B. Potlatch C. Cahokia temple mound D. Dog sleds I got C. Nezahualcoyotl was considered an outstanding leader for all the following EXCEPT: A. He was ...
January 9, 2012

World History
The effect of a new greek middle class emerging and challenging nobles for power was : A. Athenians appointed solon to make reforms B. A form of government called an olligarchy emerged C. The government moved toward democracy D. Economic reforms were introduced I got A. In the...
January 9, 2012

World History
During the empire the roman legal system contributed to : A. The outbreak of cival war B. Further conquests C. The downfall of the emperor D. Unity and stablity I got D. Which of the following statements generally describes romes attitude towards the jews in palestine? A. They...
January 9, 2012

World History
How did pachacuti the sapi inca dominate an immense empire from his small kingdom in cuzco? A. His army had better weapons and recieved intense training B. People in the region thought he was the embodiment of the god zeus C. After he had subdued neighboring peoples he ...
January 9, 2012

World History
Thank You Ms.Sue :)
January 9, 2012

World History
How did conquests and control of trade routes benefit rome by about 133 B.C.? A. Conquests and control of trade routes improved the lives of small farmers. B. Conquests and control of trade routes reduced unemployment throughout the region. C. Conquests and control of trade ...
January 9, 2012

World History
Plato rejected democracy because of the executionof socrates. Why did Plato's student, Aristotle, reject democracy ? A. He felt reason should be left to politicans, not the people B. He thought it would lead to mob rule C. He distrusted a single strong all-prowerful ...
January 9, 2012

World History
What was the cause of the peloponnesian war ? A. Greeks sought revenge for the persian wars B. Sparta wanted control of the powerful athenian army C. A spartan murdered the athenian ruler pericles D. Many Greeks outside of athens resented athenian domination I got C. What is ...
January 9, 2012

History
How did the two superpowers that emerged during the cold war compete for influence over other nations ? A. The united states and germany competed through each countrys military developments leading to the arms race B. The coviet union and the united states competed by offering...
January 6, 2012

History
Following world war 11 what factors led to japans economic sucess? A. the adoption of eastern economic philosophy that emphasized supply and demand economy B. the concentration on the production of high-quality agricultural products C. efficient modern factories adapted to the...
January 6, 2012

History
In sowing seeds of peace the purpose of the camp on maine can best be decribed as A. to educate Arab and Israeli teens B. to give orphans of families destroyed by conflict a place to meet C. for arab and israeli teens to get to know each other as people not at enemies D. to ...
January 6, 2012

History
Which of the following is most symbolic of mother teresas dedication to working with the poor? A. She wore a blue-bordered sari like the one worn bo the poor women of india. B. She founded a new order in the poorest area of calcutta C. She resided among the poor in calcutta D...
January 6, 2012

History
sorry i b is my second chioce
January 6, 2012

History
Which of the following was an effect of growing cash crops in africa A. There was a food shortage B. Countries achive econmic independence C. Small formers became rich D. Governments neglected indutrial growth. I got D. Which is the biggest effect the radio had on the villiage...
January 6, 2012

history
The conflict between palestians and jews in palestine centered around A . Differences in religion B. The claim by both groups that it was there home land C. Disagreements over borders D . The role of the british in palestine I got B. Why did colonial borders cause problems for...
January 6, 2012

history
the civil war yugoslavia was fought A.between communists and anti communists B.between pro democracy supporters and followers of milosevic C.among serb, croats and muslims D. between northern and southern yugoslavia my choice is c
January 6, 2012

history
In the 1930s what did brazil do to restore its fallng economy? A. brizal moved away from dependence on a single export. B. brazil fozused efforts on forestry C. brazil restored its silk trade with china D. brazil privatized the nations buisness and restoed personlal buisness ...
January 6, 2012

history
Which of the following is not a reason there was a rowing spirit of nationalism in africa foloowing world war 2? A. African soliders who had fought parts of the world returned home disturbed by africas discrimination. B. Workers in war time defense industrys went on strike ...
January 6, 2012

History
sorry about the beginning it was on number lock then i forgot to fix it. ithink its a
January 6, 2012

History
i think its c
January 6, 2012

History
How did china influence the economic development od taiwan. A. Chinese buisness men invested in taiwanese companys. B. Taiwan grew economically because of chinas acceptance of captialism C. Chinas cultural revolution allowed taiwan to devolup its high technology industry D. ...
January 6, 2012

History
what was the result of partian of india in 1947? A. the division futher escalted the violence between pakistan muslims and indians hindus. B. the division resulted in two economically diversed regions C.lashes with british forces shaply divided the nation and lead to wide ...
January 6, 2012

history
how did oil crisis in the 1970s illustate the promblem of economic interdependence? A.all nations rely on oil. C. multinational corporation had brought new technologies to developing countries i think its a
January 6, 2012

history
Correction* I Got B.
January 5, 2012

history
How did the crises in the 1970s illustrate the problem of economic interpendence? A. All nations rely on oil and when nations with oil resources underwent political crises production was halted and prices soared creating economic shock waves. B. The dependence of the United ...
January 5, 2012

Physics
Thank you so much
January 4, 2012

Physics
I did that including making k=(1/2)mvsqared, and I changed 65mph to mps. I get 8.89 as my answer and the computer says I am wrong and should get 36.5 what am I missing
January 4, 2012

Physics
A car with bad shocks has a mass of 1500 kg. Before you go for a drive with three of your friends you notice that the car sinks a distance of 6.0 cm when all four of you get in the car. You estimate that the four of you together have a mass of 271 kg. As you are driving down ...
January 4, 2012

Physics
my computer re sent it sorries, i was only trying ot post it once
January 4, 2012

Physics
A car with bad shocks has a mass of 1500 kg. Before you go for a drive with three of your friends you notice that the car sinks a distance of 6.0 cm when all four of you get in the car. You estimate that the four of you together have a mass of 271 kg. As you are driving down ...
January 3, 2012

Physics Repost
A at disk of material has the same mass as the Earth, 5.98E+24 kg, and has a radius of 6.25 E+07 m. Point A is located a distance of 5.8E+06 m above the center of the disk. Point B is located right at the center of the disk. Treat all of the mass as if it were located in the x...
January 1, 2012

Physics
Right and I have two different masses that need to be multiplied. The my r0 is 6.25 E 7, and R is 5.8 E 6, but using these number i am still getting 1.48 E 9 and not 2.88 E 9, so I am not sure, I have tried it different ways, am I missing something obvious here?
December 31, 2011

Physics
So I get most of what the website is saying however, it says M squared, but I have two masses and only one radius, so I am still a little confused. Please help
December 31, 2011

Physics
A at disk of material has the same mass as the Earth, 5.98E+24 kg, and has a radius of 6.25 E+07 m. Point A is located a distance of 5.8E+06 m above the center of the disk. Point B is located right at the center of the disk. Treat all of the mass as if it were located in the x...
December 31, 2011

Maths
How many points would there be if you needed to draw a 21 lined mystic rose
December 30, 2011

Physics
3. A particle of mass 0.5 kg has velocity 2 m/s. It is moving at constant velocity along a line that passes 0.5 m away from the origin, as shown in the figure below. Rank the angular momentum of the particle when it is at the points A, B, and C from smallest to greatest. Point...
December 27, 2011

Physics
2. We have two vectors that line in the x-y plane. If we take the cross-product of those two vectors we know that a. the magnitude of the cross-product will always be equal to the product of the magnitudes of the two vectors. b. the magnitude of the cross-product will always ...
December 27, 2011

Physics
1. Consider the two vectors P and Q. The definition of P is P = 􀀃i × (􀀃i × 􀀃j). The definition of Q is Q = (􀀃i × 􀀃i) × 􀀃j . a. The magnitude of P is equal to the magnitude of Q. b. The magnitude of P...
December 27, 2011

Physics
I did check E and it is 20NM in the -Z So now I am even more confused.
December 27, 2011

Physics
the square was is the ^ on top of the i and j vectors. also does that mean 1-3 is correct?
December 27, 2011

Physics
1. I am thinking A since the vectors are techinqually the same and multiplication is associative 2. I am pretty sure it is E. 3.since the particle is not attached/drawn to the origin i believe it has no angular momentum and therefore B 4. 5 times 2 is 10 so C or D so I am ...
December 27, 2011

Physics
1. Consider the two vectors P and Q. The definition of P is P = 􀀃i × (􀀃i × 􀀃j). The definition of Q is Q = (􀀃i × 􀀃i) × 􀀃j . a. The magnitude of P is equal to the magnitude of Q. b. The magnitude of P...
December 27, 2011

statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
December 19, 2011

Physics
A basketball player, standing near the basket to grab a rebound, jumps 65.6 cm vertically. How much time does the player spend in the top 10.7 cm of his jump
December 17, 2011

English
true or false 1)true or false, diction, rhythm,phrasing,sentence length,and other features of language make up a writer's style 2)in the story a pair of silk stockings, irony is not important to the theme 3)in the white heron, the white heron means the same things to ...
December 17, 2011

author
b a b c b a
December 16, 2011

vocab
8)dialog
December 16, 2011

algebra
COrrect ! great job
December 16, 2011

physics
A bullet with mass m = 5.21 g is moving horizontally with a speed v=367 m/s when it strikes a block of hardened steel with mass M = 14.8 kg(initially at rest). The bullet bounces o the block in a perfectly elastic collision. (a) What is the speed (m/s) of the block immediately...
December 15, 2011

Physics
A 645-kg elevator starts from rest. It moves upward for t = 3.13 s with a constant acceleration until it reaches its constant cruising speed of v = 1.26 m/s. It moved 2.75m during that time. a) What is the average power (W)is delivered by the motor during the initial ...
December 14, 2011

Physics
Thanks that really helped. You get 3.88 if for vi you plug in the 2.13. Now I got it thanks
December 14, 2011

Physics
A bucket of mass M = 5.47 kg is attached to a second bucket of mass m = 3:52 kg by an ideal string. The string is hung over an ideal pulley. Mass M is started with an intial downward speed of 2.13m/s. What then is the speed of mass (M) after it has moved 2.47m? The answers is ...
December 14, 2011

Physics
The answer should be 9.35m/s and I keep getting 9.40? What am I doing wrong
December 14, 2011

Physics
A bucket of mass M = 5.47 kg is attached to a second bucket of mass m = 3:52 kg by an ideal string. The string is hung over an ideal pulley. Mass M is started with an intial downward speed of 2.13m/s. What then is the speed of mass (M) after it has moved 2.47m?
December 14, 2011

Physics
A bucket of mass M = 5.47 kg is attached to a second bucket of mass m = 3:52 kg by an ideal string. The string is hung over an ideal pulley as shown in the gure. Mass M is started with an initial downward speed of 2.13 m/s. What then is the speed (m/s) of mass M after it has ...
December 13, 2011

Physics
A crate of mass 0.812 kg is placed on a rough incline of angle 35.3 degrees. Near the base of the incline is a spring of spring constant 1140 N/m. The mass is pressed against the spring a distance x and released. It moves up the slope 0.154 meters from the compressed position ...
December 13, 2011

Calculus
I'm doing test corrections, and it's been a few weeks since we did this, so I'm a little fuzzy. I'm supposed to find the zeros, relative extrema, and inflection points of f(x) = x^3 - 6x^2 + 3x + 10. The zeros would be -1, 2, and 5 right? Then I would take the ...
December 13, 2011

Physics
A ball is falling through the air. It has just two forces acting on it, its weight and air resistance. Which of the following statements is true? a. There are only conservative forces acting on the ball. b. There are only nonconservative forces acting on the ball. c. There are...
December 12, 2011

Math
Jared, the bank teller, has a total of 124 bills in fives and tens. The total value of the money is $840. How many of each kind does he have?
December 12, 2011

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