Tuesday
July 22, 2014

Posts by sarah


Total # Posts: 3,840

Physics
a 60 gram tennis ball completed 5 revolutions in 1.68 seconds. given that the radius was 35 centimeters, what haning mass was used

AP Chem
An apparatus consists of a 4 L flask containing nitrogen gas at 32 C and 885 kPa, joined by a valve to a 8 L flask containing argon gas at 32 C and 47.5 kPa. The valve is opened and the gases mix. What is the partial pressure of nitrogen after mixing? Answer in units of kPa

AP chem
An apparatus consists of a 4 L flask containing nitrogen gas at 32C and 885 kPa, joined by a valve to a 8 L flask containing argon gas at 32 C and 47.5 kPa. The valve is opened and the gases mix. What is the partial pressure of nitrogen after mixing? Answer in units of kPa

chemistry
I got x=0.091766....now what do i do? I'm confused. Also can check if this is right for x?

chemistry
What answers did u get for PCl5 and PCl3...I want to verify them please.

chemistry
Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.463 mol sample of PCl5(g) is injected into an empty 4.80 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PC...

health
list 3 documents that protect the legal rights of individuals at health care

Chemistry
Thank you so much!

Chemistry
I know how to convert moles to mass, atoms, volume etc. and I can find the limiting reagent and the percentage yield of some basic problems.

Chemistry
When MoO3 and Zn are heated together they react 3Zn(s)+2MoO3(s) --> Mo2O3(s)+3ZnO(s) What mass of ZnO is formed when 20.0 grams of MoO3 is reacted with 10.0 grams of Zn?

math
Suppose that a<b are extended real numbers and that f is differentiable on (a,b). If f' is bound on (a,b) prove f is uniformly continuous.

Chemistry
Thank you!

Physics
thank you for your help! I really appreciate it.

Physics
i'm not sure how to begin the problem at all. Or else I would have shown some work. thanks though

Physics
In the figure, two balls are located in deep space. The black ball has mass 56kg and the red ball has mass 17kg. The distance between the two balls is r=24cm. (a) Find the magnitude of the acceleration of the red ball. m/s2 (b) If r is 5 times larger, with what factor will the...

Physics
You are in a space shuttle traveling in the circular orbit, which is 380 km above the Earth. Your friend is in another space shuttle traveling on the same circular orbit with you, but he is 20 km ahead of you. (a) How long will it take you to catch up with your friend if you r...

Physics
A box of mass 250 kg slides 4.6 m down an inclined plane of 31°. Jim pushes against the box to keep it from accelerating. The coefficient of kinetic friction between the box and the ramp is 0.41 (a) Calculate the magnitude of the force exerted by Jim. (b) Calculate the wor...

Chemistry
Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide. NH4I(s) <==> NH3(g) + HI(g) At 400°C, Kp = 0.215. Calculate the partial pressure of ammonia at equilibrium when a sufficient quantity of ammonium iodide is heated to 400°C. Please help! would ...

Physics
How far above the surface of Earth would you weigh 63.6 percent of your surface weight?

Physics
A bicyclist traveling at 7 m/s rides around an unbanked curve. The coefficient of friction between the tires and the road is 0.38. What is the radius of the shortest turn that the bicyclist can safely make?

physics
an experimental rocket plane lands on skids on a dry lake bed. it is traveling at 80.0 m/s when it touches down, how far does it slide before it comes to a stop? assume the coeffcient of kinetic friction between the skids and the lake is .600

algebra
8r+7r=75

Chemistry
Consider the following electron configuration. (σ3s)2 (σ3s*)2 (σ3p)2 (π3p)4 (π3p*)4 Select four species that, in theory, would have this electron configuration.

Anthropology
In dancing with skeletons, in mali, who is usually blamed if a child is born with something the matter with it?

physics
explain why a child on a swing comes to rest directly below the top of the swinng

English
misty could you walk ms millers dog on tuesday mom asked= Misty was asked to walk the dog by her mother on Tueday. OR Misty walked the dog on Tuesday because her mom asked her

Math 11 Surface area, Volume and Capacity
Im having difficulties with this one also...

Chemistry
These are what i used. 0.0375M sodium thiosulphate , 2.5% KI .47.2 ml copper sulphate solution. the average volume of Na2S2O3 is 19.25 cm, i have already calculated the number of moles of thiosulphate which is 7.218 * 10-4 moles of Na2S2O3 and also the number of moles of I2 th...

Chemistry
If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some extent in wate...

Chemistry
Balance the redox equation by oxidation number method: Cr2O7 2- + Br- + H+ = Cr 3+ + Br + H2O Please help!

US HIstory
In what ways was dulles's policy of brinkmanship different from truman's cold war policies? Thanks

physics
If the mass of an object was 0.500 kg and it started from rest, then the object's final velocity at the end of 0.86 seconds is ?

calculus
How many horizontal tangent lines exit to the curve f(x) = x^cos(x)?

calculus
You operate a bakery. You buy cakes from a supplier who charges you $5 per cake. Government regulations dictate that you can only charge a price between $10 and $20 per cake. Your research shows that if you were to charge $x per cake, you would sell 125 - x2 cakes per week. a)...

calculus
Find an explicit expression for y' for the curve de fined by 3(x^2 + y^2)^2 = 100xy.

maths
(2x-3)^2

maths
multiply out (2x-3) squared eg small 2

writting a program
Speed of Sound. Sound travels through air as a result of collisions between the molecules in the air. The temperature of the air affects the speed of the molecules, which in turn affects the speed of sound. The velocity of sound in dry air can be approximated by the formula: &...

physics
Use the fact that a typical proton is spherical and has a diameter of 1x10^-13 cm and a mass of 1.67x10^-24 grams, compute density of a proton.

physics
Einstein saud that the amount of energy in matter is given by E=mC^2 where if m is in kilograms and c=3x10^8 which is the speed of light. The energy is E is given in Joules. Assuming that is takes an average of 1x10^11 Joules to heat your house during the year, calculate how m...

math
factorise 6m squared - 600

English
this is wht i have so far :( In the short story “The large Ant” by Howard Fast, Morgan kills an ant because his mind is set to act violently if he sees something unusual. It is human nature to be terrified and react without thinking about their action when something ...

English
I need a thesis statment for an esaay. I have read the short story "the large ant" but cant think of any thesis statment. Its about human nature and violance.

Calculus AB
I have to find the integral of (e^3lnx + e^3x)dx. Can someone help me?

Calculus AB
Oh geez two different answers.

Calculus AB
So then that could be moved around, and it would be (1-x)/(x-xy) ?

Calculus AB
I have to find y' if ln(xy) = x + y. Where do I start? I'm not sure what to do with that ln(xy)

CHEMISTRY
Find the amount of CuSO4.5H2O needed to prepare 500 mL of 0.25 M solution.

Art
I have been working on this. Here are my answers so far, can you please just double check them? 1. Alexander Calder invented this type of art. () fiber art (*) mobiles () stabiles () public art 2. Today, decisions in planning, selecting, and/or creating an artwork for public d...

Art
1. Alexander Calder invented this type of art. () fiber art () mobiles () stabiles () public art 2. Today, decisions in planning, selecting, and/or creating an artwork for public display are made in the following way. () They are the decision of the artist. () by collaboration...

chemistry
I got 28.26 for Mc....can someone confirm this answer and help me find the liters for the next part.

chemistry
In reverse osmosis, water flows out of a salt solution until the osmotic pressure of the solution equals the applied pressure. If a pressure of 47.0 bar is applied to seawater, what will be the final concentration of the seawater at 20 °C when reverse osmosis stops? Mc=? A...

Chemistry
I did what you said and didn't get the correct answer :(

Chemistry
Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 10.7 g of biphenyl in 33.9 g of benzene?

statistics
64.8

Biology
Does the amplitude of QRS complex change with the pulse amplitudes? Why or why not? So I think that the amplitude of the QRS complex should cause the pulse amplitude to change, because the pulse pressure is determined by the force of contraction of the heart. Am i on the right...

health
what should be taken into consideration when cultural bias occurs in age care

NU
Determine the net force necessary to give an object with a mass of 3.4 kg an acceleration of 4.3 m/s2

math: elapsed time
find each elapsed time 1. 9:59P.M. TO 10:45 P.M.

math: elapsed time
find each elapsed time 1. 9:59P.M. TO 10:45 P.M.

math: elapsed time
find each elapsed time. 1. 9:P.M. TO 10:45 P.M.

physical science
A child pushes a book a distance of 17m. If 5J of work was done, how much force was used?

CHEMISTRY
Write equations for the solution process when ech of the following is dissolved in water. Potassium phosphate glucose Calcium chloride 1-propanol Butanone Ammonium sulfite

CHEMISTRY
What will be the concentration if 52mL of a solution that is 12ppm in sodium chloride is diluted with enough water to make 97mL of solution?

math
what is equivalent fraction of 9/10 and 7/12

chemistry
I had the exact same question, but the when I tried the second equation, it was wrong.

chemistry
2.875 mol H2O = ___ g

Math
Nico is saving money for his college education. He invests some money at 5%, and $2300 less than that amount at 3%. The investments produced a total of $163 interest in one year. How much did he invest at each rate?

Chemistry
thanks for your suggestion. but maybe is it possible to use the titration method to determine whether or not the precipate would for form, for example, adding the large concentration of AgNO3 and NaCl which would cause the precipitate to form and then use those values obtained...

Chemistry
If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some extent in wate...

Algebra
the altitude of a triangle is 3m less than half its base. If the area of the triangle is 300 m^2 find the measure of the base.

chemistry
if 1.2x10^24 molecules of water freeze how much energy is released by the water according to the equation below? - H2O(l)-> H2O(s);ΔH=-6KJ

english
diagram follow sentence the children who are in the fifth row will have no homework tonight

Physics
A student argues that as a satellite orbits the earth in a circular path, it moves with a constant velocity and therefore has no acceleration. The professor claims that the student is wrong since the satellite must have a centripetal acceleration as it moves in its circular or...

physics
i want this too :(

intermediate algebra
$3,480 are 105% so you divide $3,480 by 105 and then multiply it by 100, because you want to know what amount it was before it was raised 5%

Physics
A cannon is fired from a cliff 190 m high downward at an angle of 21° with respect to the horizontal. If the muzzle velocity is 34 m/s, what is its speed (in m/s) when it hits the ground?

calculus
rotate about x=16

calculus
volume of the solid enclosed in y=square root of x y=0 and x=16

math
A 200-miles trip by an electric automobile must be completed in 4 hours. If it takes x number of hours to travel the first half of the distance, write an equation describing the average speed for the second half of the trip as a function of x for the 0<x<4.

math
0≥16 true or false

math,angles
thank you very much you are very help ful and so were these videos ...u guide me to where i need to be so i want to thank you ...not only for this but i am a straight A student with some guidence and its because of you so thank you :):)

math,angles
Could anyone help me with showing me how to bisect an angle

MATH
thats ok but thank you very much and once again sorry i was just a little uncomfortable sharing my name so thank you anyways ill have to ask my teachers assistance

Pre-Algebra with PIZZAZZ
It goes into negetives i think ...so 9 subtract 14 would be negetive five ...hope that helps.

Science
I do not need a link, just a straight up answer please. What are 3 saftey tips you can give me for 'Tornadoes'?

geometry/algebra
at 5pm a person 5 feet tall casts a 10 foot shadow. at the same time a flagpole casts a 40 foot shadow. what is the height of the flagpole?

English
I have to write a conversation between two characters from Groom Service by Michael Dorris(shot story)Is there is anyone who had read this story and wrote dialouge fot it? Please help :(

algebra
Find the equation using a slope-intercept form if possible.. x-intercept −1, y-intercept −2 I do not know how to start this.. HELP!

english
For English II I'm supposed to write a persuasive essay on a speech such as the "I Have A Dream Speech" or similar. I don't particularly care for King's speech. What are some other speeches I could use?

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 ...

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

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

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.

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

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 ca...

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 thi...

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?

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?

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?

Pages: <<Prev | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | Next>>

Search
Members