Friday
August 1, 2014

Posts by SARA


Total # Posts: 3,607

chemistry
what is the difference between a nanocomposite and a nanotube?

chemistry
please give me an example of a nanocomposite material

chemistry 30a
What volume (in mL) of an 8% w/v acetic acid solution would be needed to form 2.2 L of carbon dioxide gas at 25.2 degrees Celsius and 0.9982 atm? Assume the acid is reacted with excess sodium bicarbonate, and round your final answer to two sig figs.

math 156Trig Help
2x

Physics
ions

physics
A box with a mass of 2 kg is lifted (without acceleration) through a height of 8.0 m in order to place it upon the shelf of a closet. (a) What is the increase in potential energy of the box? 1 . J (b) How much work was required to lift the box to this position? 2 J

Physics
A roller-coaster car with a mass of 650 kg starts at rest from a point 28 m above the ground. At point B, it is 14 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? 1 . kJ (b) What is the potential energy at poi...

Algebra
in put y=x(10)

Math
The coordinates of the vertices of CDE are C(1, 4), D(3, 6), and E(7, 4). If the triangle is reflected over the line y = 3, what are the coordinates of the image of D? (3, –6) (3, –3) (3, 0) (3, 9)

Geometry
b.20 because 1:3:5 1+3+5=9 180/9=20 20:60:100

1 geometry question
The coordinates of the vertices of CDE are C(1, 4), D(3, 6), and E(7, 4). If the triangle is reflected over the line y = 3, what are the coordinates of the image of D? (3, –6) (3, –3) (3, 0) (3, 9) i have no clue

Finance
Which of the following has more interest risk? Why? A. Bond A with a 10% Coupon and a YTM of 10% which matures in 5 years. B. Bond B with a 10% Coupon and a YTM of 10% which matures in 11 years. C.) A share of Preferred Stock that pays $10 dividend in perpetuity with a require...

Finance
A proposed project has expected cash flows of $72,000 per year for 5 years. If the project has an initial cost of $400,000, what is the payback period (in years)?

Finance
You recently paid $31.50 for a share of Breaking Benjamin stock. Your required rate of return is 13% and you expect the company to increase dividends at a constant rate or 2.5% for the forseeable future. What was the most recent dividend of Breaking Benjamin?

calculus
A 29-ft chain with mass density 3 lb/ft is initially coiled on the ground. How much work is performed in lifting the chain so that it is fully extended (and one end touches the ground).

chemistry
How many molecules in 8.221g PbO2?

geometry
find the altitude of an equilateral triangle with side length twelve

geometry
the base of an isoscels triangle is 4x long. the altitude to the base is 3x cm long. Find the length of one other side of the triangle

physics--please help
When only the front wheels of an automobile are on a platform scale, the scale balances at 7.8 kN; when only the rear wheels are on the scale, it balances at 5.5 kN. What is the weight of the automobile? How far is its center of mass behind the front axle? (The distance betwee...

physics
When only the front wheels of an automobile are on a platform scale, the scale balances at 7.8 kN; when only the rear wheels are on the scale, it balances at 5.5 kN. What is the weight of the automobile? How far is its center of mass behind the front axle? The distance between...

calculus
find lim x->0 3- sqrt x+9/-x

world history
thank you

world history
i need a website that proves that because i have to do a bibliography for this section of the senior project

world history
training like a student teacher something like that isn't that consider as a training

world history
i'm working on my senior project and i need some help i'm supposed to do some researches about my future career, however i couldn't find a website that tells me if a world history teacher needs an additional training or not ?

math Statistics
Hi I need help with Statistics. Can anyone help me to understand it better? I am in fear that if I do not figure this out soon I will fail my class. I am needing help with the chapters 12,and 13. in the book called Statistical Reasoning in the Behavioral Sciences, 6th edition....

physics--please help
Only need help with part c--answer for part a is 2.94 radians and for b it is 777 days Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be i...

physics
Only need help with part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positione...

Government
Cross pressured v?

last Government
These voters are caught between conflicting issues. young voters independent voters strong party voters cross-pressured voters

Government
When party loyalists select the candidates of their party, they vote a propaganda ticket. straight-party ticket. cross-pressured vote. landslide.

Physics to drwl please help
Only need help with part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are position...

Math
18th

physics
I need only part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such ...

physics
I need only part c Mars orbits the Sun at a mean distance of 228 million km, in a period of 687 days. The Earth orbits at a mean distance of 149.6 million km in a period of 365.26 days. All answers should be in the range (0, 2pi) a) Suppose Earth and Mars are positioned such t...

physics
thanks

physics
not the right answer

physics
A particle is moving clockwise in a circle of radius 1.54 m. At a certain instant, the magnitude of its acceleration is a = 26.0 m/s2,and the acceleration vector has an angle of θ = 50° with the position vector, as shown in the figure. At this instant, find the speed,...

physics
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...

physical science
5/17=0.294 N

physics
it is d

physics
for L, are you using the answer from part a?? when i use that i get around 14 degrees

physics
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...

English 5 questions
1. During this time period, writers sought to capture the _____________ of the American people during this era of a new postwar economy and society. peace anger anxiety all of the above 2. Like the modernists, postmodern writers focused on _____________ experience and emphasiz...

physics
thanks

physics
A man with a mass of 50 kg stands up in a 66-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe mo...

1 chem question
A base has a Kb of 2.5 x 10–11. Which of the following statements is true? This is a concentrated base. This base ionizes slightly in aqueous solution. This is a strong base. An aqueous solution of this base would be acidic. (do explain. i dont understand this one)

physics
A man with a mass of 52 kg stands up in a 66-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe mo...

Physics
Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and μ = .2. How much work has he done while pulling the string 5.0 m? If it takes her 1.0 seconds, how much power has she used? If 1.0 kcal = 4184 J, and an Oreo has 50 kcal, how many Oreos did Pepper ...

Physics
Pepper pulls a 20.0 kg object along the floor accelerating at 2 m/s/s, and μ = .2. How much work has he done while pulling the string 5.0 m? If it takes her 1.0 seconds, how much power has she used? If 1.0 kcal = 4184 J, and an Oreo has 50 kcal, how many Oreos did Pepper ...

Chem
Which of these solutions is the most basic? [H+] = 1 x 10–2 M [OH–] = 1 x 10–4 M [H+] = 1 x 10–11 M [OH–] = 1 x 10–13M i think its the first one?

Chemistry
I just wanted to say i found this question and if helped me so much with my homework! thank you so much DrBob222!!

Algebra
Find the square roots of 25

Chem
Which of the following statements is part of the kinetic theory? The particles of a gas move independently of each other. The particles in a gas move rapidly. The particles in a gas are relatively far apart. all of the above

physics
convert 52 g to kg and then 218 divided by that number

physics
I did that but i am not getting the right answer

physics
Betty Bodycheck (mB = 50.2 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45.2 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° c...

physics
The question is what are their final kinetic energy?

physics
Betty Bodycheck (mB = 50 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 45.2 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° cou...

physics
This means that for every action, there is an equal and opposite reaction

math
454.86

physics
A billiard ball of mass 0.16 kg has a speed of 1.80 m/s and collides with the side of the billiard table at an angle of 34.6°. For this collision, the coefficient of restitution is 0.841. What is the angle relative to the side (in degrees) at which the ball moves away from...

Psychology
As a consumer of mental health services, which type of therapy would you prefer if you did not like to talk about your problems? If you were suffering from a phobia? If you had recurring nightmares since childhood? If you wanted to improve your marriage?

trig
if diameter of the circle is 100 cm. and length of the arc forming the angle is 360 cm. Assume that the earth is a perfect sphere of diameter 8000 miles. Find the distance between: Rome, Italy: latitude 42 degrees north Copenhagen, Denmark: latitude 54.3 degrees north

Geometry
What is the measures of the angles of a triangle that are in the extended ratio 2:2:8. What is the measure of the smallest angle?

poetry
what is the genre of the poem: tonight i can write by pablo neruda?

English
faith that he will one day be affirmed by white America. ???

English
The speaker in “I, Too, Sing America” survives adversity because he feels faith that he will one day be affirmed by white America. he has uncovered the hypocrisy around him. he is better than the people who are oppressing him. hope that he can one day run away from h...

English
F. Scott Fitzgerald dropped out of college to ..... begin writing. get married. join the army. work for his father.

chemistry
A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The alcohol content (alcoho...

English
Why don’t the narrator and the other man want to hold Edward for ransom? Is their motivation internal or external? in " Why, You Reckon?"

calculus
Solve for x: 2x=ex+1

calculus
Put the function P=40(39)t in the form P0e^kt. When written in this form, you have: k= ? P0= ?

calculus
I don't know if I'm typing it in wrong into my graphing calculator but I need to estimate the limits of sin(8 theta) / theta

biochemistry
If you make up a solution of 100 mL of 0.1 M HEPES in the basic form, what will be the pH? I have no idea where to even start...

psy/300
What are the positive aspects of peer groups during adolescence? Which of Erikson's stages describes the psychological issues of adolescence.

chemistry
thank you

chemistry
thank you

chemistry
Freshman in clooege decides to try her hand at pickling olives. According to the recipe, she needs to add 3 tsps. of salt to 1 cup diced olives. She erroneously adds 6 tsps instead. Each tsp weighs about 5g and contains 2300 mg of sodium. Determine the amount of sodium added i...

Physics
On a safari, a team of naturalists sets out toward a research station located 7.0 km away in a direction 42° north of east. After traveling in a straight line for 3.1 km, they stop and discover that they have been traveling 20° north of east, because their guide misrea...

calculus
Thanks Steve, I didn't know how to use this function on the calculator.

calculus
calculate y = log_10(x) where x = 0.3

chemistry
Thanks, That's it!

chemistry
that is very true. What I was asking involves something like this as an example: 30mg/kg*1000g / 1kg* 1g /1000mg 30-/kg* 1000-/1-* 1g/1000- 30 * 1000/1000 * 1g = 30g

chemistry
Tell me what you think: I wrote #kg = 297mg / 3.5 mg/kg the mg's would eliminate each other and you are left with 297 / 3.5 kg = 85 kg.

chemistry
The physician has prescribed a medication of 3.5 mg/kg of body weight. If you give 297 mg of medication what is body weight of patient in kg? Is there a converstion formula?

Chemistry
I'm sorry, let me re ask this question and tell you what I've come up with ( I work 11pm-7am and do not sleep in daylight hours) Given 30mg/kg and need grams per dose with dosage every twelve hours. Here's what I've attempted: need to change mg/kg to grams --&g...

Chemistry
The question just gives me the dosage of 30 m/kg for every twelve hours and asks what the dosage would be in grams.

Chemistry
I need the equation for determining how to decide : You are given a dosage of 30m/kg to be given every twelve hours, how much is given (in grams) with each dose. I know the answer is obviously 15 m/kg but what is it in grams?

algebra
amanda weighs 3/4 as much as er ister. if amanda weighs 129 how musch does her sister weigh? how do you write the equation with x being the sisters weight.

Math
The vertices of an isosceles triangle are A(3, 6), B(7, 2), and C(4, 3). What is the equation of the triangle's line of symmetry? y= x+1 y= x-1 y= x y = -x+1

math
a rectangular swimming pool is 15 yds x 25 yds. the bottom of the pool needs to be repainted. if it costs $4.25 per square foot to paint the pool, give the cost to repaint the bottom of the pool.

Statistics-Confidence Interval
Can someone please help me on how to work this out?? I'm so super confused. Thanks! A professor at Kaplan University claims that the average age of all Kaplan students is 36 years old. Use a 95% confidence interval to test the professor's claim. Is the professor's ...

Chemistry
What is the net ionic equation for this reaction? 2MnO4 (aq) + 5H2C2O4 (aq) + 6H(aq)----->10CO2 (g) + 2Mn(aq) + 8H2O(l)

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?

precalculus
thank you my precalculus is now done - chemistry is next- can't wait!!

precalculus
given functions f,g, and h find f o g o h state exact domain. show work f(x)=1/x g(x)=lnx h(x)=2x+15

precalculus
these are hard to do - thank you

precalculus
verify the functions are inverses of each other by showing that f(g(x)) =x show work. f(x)=6/1-x g(x)= 1- 6/x

precalculus
I'm going to do this on my own, but I would like to check mine against yours - give me today to work on it and I will be able to compare. List all possible rational zeros for the polynomial find all real zeros and factor completely. show work f(x)=3x^4-29x^3+89x^2-75x-36 t...

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