Wednesday
August 20, 2014

Posts by Kelsey


Total # Posts: 538

Physics
A block of wood is pulled by a horizontal string across a horizontal surface at a constant velotcity with a force of 20 N. What is the coefficient of kinetic friction between the surfaces?
October 13, 2010

Physics
A box weighing 600 N is pushed along a horizontal floor at a constant velocity with a force of 250 N parallel to the floor. What is the coefficient of Kinetic friction between the box and the floor?
October 13, 2010

Physics
thank you!
October 13, 2010

Physics
A 25-kg crate requires a horizontal force of 40 N to set it in motion. What is the coefficient of static friction between the crate and the floor?
October 13, 2010

world history
What distinguished the first centuries od Islamic history from the early history of Christianity and Buddhism? What simialrities and differences characterized their religious outlooks?
October 4, 2010

chem 115
1) here has been a great deal of controversy over whether cell phones cause brain cancer due to the emission of high energy waves near the head. The data on this is still being discussed (see NY Times article if you want more information) but we can do a simple calculation. ...
September 23, 2010

chem 115
The first ionization energy is the energy necessary to completely remove the outermost electron from an atom. For a Hydrogen atom this energy is 2.18 X 10^-18J. If you were to use a laser to provide this energy, what is the wavelength (in nm) of the light emitted from the laser?
September 23, 2010

MAth
630. i was confused about the rounding up or down of five.. some say down and some say up.
September 22, 2010

MAth
Round to the nearest hundred and the nearest tenth. 625
September 22, 2010

Math
Reasoning question... in order from least to greatest the six numbers whose digits are 2,8, and 9...
September 21, 2010

english
What is the theme of the poem A Kite is a Victim. What are juxtapositions in this poem
September 20, 2010

poetry
I am sorry could you give me a hint. I have read it over quite a few times. I still do not see where there are juxtapositions
September 20, 2010

poetry
Could you tell me how to go about analyzing or theme or poem "A Kite Is a Victim" by Leonard Cohen What are juxtapositions ?
September 20, 2010

algebra 1
(x+5)(x+2) (x-2)(x-2) (x+5)(x-12) (3c-4d)(2c+5d) (5x-3)(3x-8)
September 9, 2010

math
A rate is the increase between the time(seconds) and distance (meters).
September 2, 2010

physics
A 1000 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the kinetic frictional force f_k between the boat and water is proportional to the speed v of the boat: f_k = 70v, where v is in meters per second and f_k is in newtons. Find the time required...
August 30, 2010

chemisry
Cd/Cd2+//H+/H2/Pt Write the oxidation and reductionhalf reactions. Sketch a possible deisgn cell. I am unclear on the Pt portion and the charges ?
August 30, 2010

chemistry
2H2O2 --- 2H2O + O2 is this a redox reaction if so what is the oxidized reactant and reduced reactant
August 26, 2010

chemisry
Two half cells in a galvanic cell consist of one iron electroide in a solution of iron sulphate and a silver electrode in a silver nitrate solution a) Assume that the cell is operating as a galvanic cell. State the oxidation half reaction, the reduction half reaction and the ...
August 25, 2010

chemisry
I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;
August 25, 2010

chemisry
I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;
August 25, 2010

chemisry
2NaHCO3 --- Na2CO3 + H2O + CO2 2Fe + 6 HCl -- 2 FeCl3 + 3H2 2HBr + Ca(OH)2 -- CaBr2 + 2H2O N2 + 3H -- 2NH3 2H2O -- 2H2O + O is this a redox ? what is oxidized, reduced
August 25, 2010

Chemistry
3Ag2S + 2 Al -- 6 Ag + Al2S3 State the charge on each ion in each of the comounds listed. I am having a hard time understanding how to do these redox questions
August 25, 2010

chemistry
a) show a balanced neutralization reaction for each. b) Determine how many moles of base are needed to neutralize 2 mles of acid of these reactions. Can you show me the work,using the mole ratio ?? HNO3 + KOH -- H2SO4 + NaOH --
August 16, 2010

chemisry
A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a precipitate forms, it is ...
August 16, 2010

chemistry
I do not know where to start with this question. How can i find a substance that will form a precipitae with the lead. Could you suggest one and the possible formula
August 13, 2010

chemistry
A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a precipitate forms, it is ...
August 13, 2010

chemistry
I thought I was to use a formula n=cXv. I had NaS c=.002 L V >01 mol/L Therefore I got NaS as .00002. So I had Na S as the limiting reagent
August 13, 2010

chemistry
2.00mL of 0.01 mol/L aqueous sodium sulphide is used to test a 50.omL sample of water containing 0.0005 mol/L mercury (II) nitrate ions. What mass of precipitate is formed? Na2S + Hg(NO3)2 --- 2NaNo3 + HgS determine limiting reactant using limiting reactant, calculate the ...
August 13, 2010

chemistry
what chemical test can be used to test for lead in water
August 11, 2010

chemistry
a contaminated water sample has a H of 3. How many times more acidic is this sample compared to neutral water of 7
August 11, 2010

chemistry
write a complete strucural formula for each reaction, Name the reactio and then the reactants and products C3H6 + Cl2 --- C3H6Cl2 NH3 + C4H9COOH---C4H9CONH2 + H2o C5H12 = O2 -- CO2 H2O
August 9, 2010

chemistry
Using structural formula, draw formulae illustrating the complete combustion of ethanol
August 9, 2010

chemistry
what two tests can I use to determine if a comound is an alcohol or a short or long chained carboxylic acid. I have two substances a colourless liquid and a white solid.
August 9, 2010

Chemistry
Please be specific. In an experiement 23.4 g of iron sulphide, FeS are added to excess oxygen, and 16.5 of Iron oxide, Fe2O3 are produced. The balanced euation for the reaction is 4FeS =7O2 -- 2Fe2O +2SO2. Calculate the percent yield of iron oxide in the experiment.
August 3, 2010

chemistry
I have posted this once and still cannot get the correct answer. Determine the mass of carbon monoxide that is produced when 45.6 of methane, CH4, react with 73.2 g of oxygen , O2. The products are carbon monoxide and water vapour.
August 3, 2010

science
What is a meteor mad out of?
August 1, 2010

12th grade chemistry
How do I prepare 500 ml of a .100 mol/L solution of copper sulphate.
July 30, 2010

chemistry
In an experiement 23.4 g of iron sulphide are added to excess oxygen and 16.5 grams of iron (III) oxide, Fe2O3 are produced the balanced equation for the reaction is 4FeS + 7O2 -- 2Fe2O3 + 2SO2 Calculate the percent yield of iron oxide in the experiement
July 27, 2010

Chemistry
Determine how many atoms there are in 1 litre of hexane or gasoline. A litre of gasoline has a mass of approximately 850.0 grams. Assume that the molecular formula for gasoline is C6H6
July 27, 2010

Chemistry
Determine how many atoms there are in 1 litre of hexane or gasoline. A litre of gasoline has a mass of approximately 850.0 grams. Assume that the molecular formula for gasoline is C6H6
July 27, 2010

chemistry
Determine the mass of carbon monoxide that is produced when 45.6 g of methane, ch4 react with 73.2 g of oxygen gas, o2. The products are carbon monoxide and water vapour
July 27, 2010

math
let a,m, and n be whole numbers where m>n and a is not zero. a^m/a^n= a^m-n
June 22, 2010

Anatomy & Physiology 1
I have looked most of these up and found the answers but there are some that I could not find, that is why I was wanting someone to check my answers.
May 27, 2010

Anatomy & Physiology 1
Could someone please check over my answers, and let me know if any of them are wrong. If they are wrong could you please give me the correct answer or tell me where I could find it..Thanks in advance for any and all help.... 1. The process of breaking a complex substance down ...
May 27, 2010

Medical Terminology
Thank you very much SraJMcGin for all of your help. I really appreciate it.. :)
May 23, 2010

Medical Terminology
Could someone please check my answers. If they are incorrect could you please give me the correct answers or tell me where I could find them.. Thanks... 1. A patient has unrealistic thoughts and behaviors despite an awareness that they’re inappropriate. She’s ...
May 23, 2010

medical terminology
Could someone please check my answers. If they are wrong could you give me the correct answer or tell me where to find it..Thanks in advance for all your help... 1. A patient has calculi present in the kidney. This statement indicates which diagnosis? A. Nephrolithiasis B. ...
May 22, 2010

physics
A row of six 1 N wooden blocks is being pushed across a tabletop at a constant speed by a tow tractor that exerts a force of 1.3 N on the row. What is the coeffiecient of kinetic friction between the wooden blocks and the tabletop?
May 17, 2010

reimbursement methodologies
Would these be the correct answers? 1. C 2. D 3. B 4. D 5. D (which was my original answer)
May 14, 2010

reimbursement methodologies
Yes, I went back and changed the answers that Anonymous, said were wrong on the other post. I was needed someone to re-check my new answers for me...Thanks for the help.
May 14, 2010

reimbursement methodologies
I read over my answers and re-done them, could someone please check them again for me.. Thanks in advance 1. By creating a committee on social welfare, the American Association of Labor Legislation helped to A. decrease public hospital costs. B. implement fee schedules. C. ...
May 14, 2010

Reimbursement Methodologies
Would someone check my answers please, thanks for any help.. 1. By creating a committee on social welfare, the American Association of Labor Legislation helped to A. decrease public hospital costs. B. implement fee schedules. C. implement health care coverage for the working ...
May 14, 2010

physics
is the acceleration of a child sitting near the center of a merry go round larger than the acceleration of a child sitting near the edge of the same merry go round?
May 11, 2010

physics
is the acceleration of a child sitting near the center of a merry go round larger than the acceleration of a child sitting near the edge of the same merry go round?
May 11, 2010

Physics
A 60.0 kg runner expends 355 W of power while running a marathon. Assuming that 8.00% of the energy is delivered to the muscle tissue and that the excess energy is primarily removed from the body by sweating, determine the volume of bodily fluid (assume it is water) lost per ...
May 1, 2010

Math
Why does a poor white
April 29, 2010

Math
Why does a poor white
April 29, 2010

math
26
April 29, 2010

physics
A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Two metallic blocks are placed in the water. One is a 50 g piece of copper at 79°C. The other sample has a mass of 83 g and is originally at a temperature of ...
April 28, 2010

physics
A spherical steel ball bearing has a diameter of 2.540 cm at 24°C. (a) What is the diameter when its temperature is raised to 82°C? (b) What temperature change is required to increase its volume by 1.1%? I got the first answer right. i am having trouble understanding ...
April 25, 2010

physics
never mind...
April 25, 2010

physics
A brass ring of diameter 10.00 cm at 19.9°C is heated and slipped over an aluminum rod of diameter 10.01 cm at 19.9°C. Assume the average coefficients of linear expansion are constant. (a) To what temperature must the combination be cooled to separate the two metals? (...
April 25, 2010

Physics
never mind, i got it. thanks so much!
April 25, 2010

Physics
so i did that and I got 4.0 X 10 ^16 and it's still wrong...am I just missing a conversion somewhere or something like that?
April 25, 2010

Physics
(a) An ideal gas occupies a volume of 1.6-cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. (b) If the pressure of the 1.6-cm3 volume is reduced to 1.6 10-11 Pa (an extremely good vacuum) while the temperature remains constant...
April 25, 2010

physics
The moon has a mass of 7.35 E 22 kg and is located 3.84 E 8 meters from the Earth. If Ellen, an earthling, has a mass of 47 kg, what is the gravitational force between Ellen and the moon?
April 21, 2010

physcs
A potter's wheel having a radius 0.55 m and a moment of inertia 11.6 kg·m2 is rotating freely at 55 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and exerting a radially inward force of 66 N. Find the effective coefficient of ...
April 17, 2010

physics
thanks again
April 17, 2010

physics
A rubber ball filled with air has a diameter of 25.1 cm and a mass of 0.618 kg. What force is required to hold the ball in equilibrium immediately below the surface of water in a swimming pool? I tried using the equation B = density(fluid)volume(object)g B = 1.0E3(4/3(pi)(....
April 17, 2010

physics
oh wow, thanks.... wish I would have thought of that. it worked.
April 10, 2010

physics
A satellite moves in a circular orbit around Earth at a speed of 4390 m/s (a) Determine the satellite's altitude above the surface of Earth.(meters) (b) Determine the period of the satellite's orbit. (hours) I used the equation M(sattelite)V^2/r = M(sattelite)(Mass(...
April 10, 2010

physics
I tried to use V^2/r = GM(earth)/r^2 but I am not getting the correct answer.
April 7, 2010

physics
A satellite moves in a circular orbit around Earth at a speed of 4390 m/s. (a) Determine the satellite's altitude above the surface of Earth. m (b) Determine the period of the satellite's orbit. h am I supposed to use rotational equations for this? I don't know ...
April 7, 2010

physics
Objects with masses of 190 kg and a 490 kg are separated by 0.380 m. (a) Find the net gravitational force exerted by these objects on a 57.0 kg object placed midway between them. N (b) At what position (other than infinitely remote ones) can the 57.0 kg object be placed so as ...
April 5, 2010

highschool anatomy
During what period of life does immunocompetence develop?
March 29, 2010

physics
(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular speed of 79 rev/min in 5.0 s? (b) When the disk is at its final speed, what is the tangential velocity of the bug? (c) One second after the bug ...
March 28, 2010

physics
and for the second one, i took the rad/s and multiplied it times .1524m to get m/s and it said i was incorrect again.
March 27, 2010

physics
well, for the first one, I changed the rev/s to rad/s which was 8.275 rad/s and then i divided that by 5s to get the angular acceleration and then mulitiplied it by the radius (.1524m) in order to change it to tangential acceleration but it said my answer was incorrect.
March 27, 2010

physics
(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular speed of 79 rev/min in 5.0 s? m/s2 (b) When the disk is at its final speed, what is the tangential velocity of the bug? m/s (c) One second after the...
March 27, 2010

physics
A car initially traveling at 31.0 m/s undergoes a constant negative acceleration of magnitude 2.00 m/s2 after its brakes are applied. (a) How many revolutions does each tire make before the car comes to a stop, assuming the car does not skid and the tires have radii of 0.330 m...
March 27, 2010

Physics
never mind.
March 24, 2010

Physics
A dentist's drill starts from rest. After 3.00 s of constant angular acceleration it turns at a rate of 2.8 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.
March 24, 2010

Physics
A skier of mass 76 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 40 m up a 30° slope (assumed frictionless) at a constant speed of 2.5 m/s? J I know that the answer to the first problem is 14896Joules, but I do not know how to ...
March 10, 2010

algebra
multiply both sides by six which gives you 3xa = 12 then divide by 3 which gives you xa = 4 then if you are solving for x, divide both sides by a which gives you x = 4/a if you are solving for a, do the oppisite.
March 10, 2010

physics
Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string. (one mass is on the incline, the other is hanging from the pullye) The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline ...
March 10, 2010

Physics
Thank you SO much! I didn't realize i had to do 27(1-cos33)
March 10, 2010

Physics
Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? (b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s? I tried to ...
March 10, 2010

physics
never mind, I figured it out.
March 10, 2010

physics
A 770 N man stands in the middle of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a ...
March 10, 2010

physics
When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, ...
March 10, 2010

Physics
I drew the sketch, the problem does not tell me how high he is initially, I can find the equation vfinal = the square root of (2gh) but I don't know what h is.
March 10, 2010

Physics
Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?(b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s?
March 10, 2010

Physic
Ok so this question was posted before but I'm confused by the answer. The problem is: The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in Figure 10-23 are released from rest, with m1 at a height of 0.87 m above the floor. When m1 hits the ...
March 8, 2010

6th grade
For every 25 mm of rain falling on the avarage home, 5000 L runs off the roof. Some people use barrels to collect this rain water. Cecila's town usually has 2625mm of rain each year. How many litres of water can be collected by using barrels?
March 8, 2010

Spanish
We are learning Indirect object pronouns and I need help with the following questions. Traduce las frases al espanol. 11. He asked her for more money. 12. I gave you your present. 13. She bought you a new dress. 14. He prepared dinner for us. 15. Musicals fascinate me. 16. She...
March 8, 2010

Chemistry 101
I don't remember my instructor going over this and the book isn't explaining it very well. Can anyone help answer these? Indicate the concentration of each ion or molecule present in the following solutions. 1. 0.30 M NaNO3 2. 1.5x10^-2 M MgSO4 3. 2.00x10-2 M C6H12O6 4...
February 22, 2010

Chemistry help
I'm not sure how to answer this question.... Assume that magnesium would act atom-for-atom exactly the same as copper in this experiment. How many grams of magnesium would, have been used in the reaction if one gram of silver were produced? The atomic mass of magnesium is ...
February 15, 2010

Chem answer check
Does this look correct? Thx! Write the balanced equation for the reaction between solid copper and silver nitrate, that produces solid silver and copper(II) nitrate in solution. Include your experimentally determined mole ratios for the copper and silver atoms as coefficients...
February 15, 2010

1st grade
3 facts about motion
February 10, 2010

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