Friday
February 27, 2015

Posts by ANNA


Total # Posts: 2,118

chemistry
A sample of oxygen that occupies 2.5 × 10−6 mL at 508 mm Hg is subjected to a pressure of 1.2 atm. What will the final volume of the sample be if the temperature is held constant? Answer in units of mL
February 25, 2015

physics
Ohh I see the pulling force is 220.5 The frictional force is 66 For the normal force I actually got 367.85 I just don't understand how you solved for acceleration by saying 1/2-1/5*7.96
February 22, 2015

physics
Sorry I meant 47 kg.
February 22, 2015

physics
For the frictional force I got 61.4 For the magnitude of the Normal force I got -398.5 and for the amount of force pulling you down the slope I got -250.2 I don't think that's right though.
February 22, 2015

physics
Oh sorry. To find the frictional force is it (0.18)*(47.0)(9.80)cos37 degrees and the magnitude of the Normal force is (47.0)(9.80)cos37 degrees
February 22, 2015

physics
Is this right? (45.0)*(9.80)*(sin35 degrees)= a number a number - frictional force = answer
February 22, 2015

physics
You are skiing and have a mass of 47 kg and are on a slope making an angle of 37 degrees above horizontal. The coefficient of kinetic friction between the skis and the snow is 0.18. What is the amount of force pulling you down the slope? What is your acceleration down the slope?
February 22, 2015

statistics
I also need help with this question!!!!
February 22, 2015

Spanish
Thank you Sra. Yes I got the question and answers backwards in part II. SCAMP really helps. I will add that to my notes. Thank you.
February 20, 2015

Spanish
Hola Sra. Are these correct? Part I Indique si las palabras dadas son sinónimos, antónimos o que no son relacionadas. 1. maletas y equipaje sinónimos 2. despegar y aterrizar antónimos 3. abrochar y confirmar no son relacionadas 4. ida y vuelta sin&...
February 20, 2015

Math Help
Hi! Can someone please help me with these? Thanks! :) Directions: Look for the direction angle for vector v. If necessary, round your answer to the nearest tenth of a degree. 1.) v = 8i - 10j 2.) w = -4i - 3j
February 18, 2015

Math
u = <7, -3> and v = <-2, 4>. Find u + 3v.
February 18, 2015

Chemistry
1.How much energy is emitted by 1 mol of sodium ions emitting light at this wavelength? Answer in units of kJ. This is what I did for this problem, but my answer is wrong 45.8 mg = 0.0458 g 0.0458 g / (23.0 g/mol) = 0.001991 mol Na 0.001991 mol x (6.02214 x 10^23) = 1.199 x 10...
February 13, 2015

Spanish
Thank you so much Sra. These all make sense.
February 12, 2015

Spanish
Sra. Do these look correct? Part I LOS MANDATOS AFIRMATIVOS. Forme mandatos afirmativos directos según el ejemplo: Ejemplo: BUSCARLO (tú) Búscalo 1. CONDUCIR (Ud.) conduzca 2. PREGUNTARLES (Uds.) pregnútenles 3. COMER (nosotros) comamos 4. OLVIDARSE...
February 12, 2015

math
A bag contains 5 red and 4 green apples. Michael takes one apple at random from the bag. His sister Ashley then takes an apple at random from he bag. What is the probability that the two apples are the same colour? Can you explain to me how to do this please? Do I need a ...
February 8, 2015

Physics
Okay, I understand now. Thank you.
February 2, 2015

Physics
Thanks. I didn't realize f=ma could be used because of gravity's acceleration.
February 2, 2015

Physics
A 2.0 kg mass is attached to a string that is 1.0 m long and moves in a horizontal circle at a rate of 4.0 revolutions per second. a) What is the centripetal acceleration of the mass? I converted 4 rev/s to 25.13 rad/s and used the equation: a=rw^2 to get 632 m/s^2 b) What is ...
February 2, 2015

Physics
A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?
January 29, 2015

physics
With an average acceleration of −1.3 m/s2 , how long will it take a cyclist to bring a bicycle with an initial speed of 13.7 m/s to a complete stop? Answer in units of s.
January 29, 2015

Math
how would you figure out what % of people have black hair
January 27, 2015

Math
At a parade 1/4 of the participants have red hair, 1/6 of them have brown hair, and the rest of the participants have black hair. What fraction of the participants have black hair?
January 27, 2015

Math
Can you please explain how you got 2.4 and we'll keep the posts under Jordan's name. Thank yOU!!!
January 27, 2015

Physics
a batter hits a baseball into the air. If the horizontal component (X-component) of the velocity is measured to be 20.4 m/s, if at it's max height the ball was in the air for 2.5 s, at what angle was the ball hit off the bat?
January 25, 2015

Physics
a bullet is fired horizontally from the top of a cliff that is 15 m above a long lake. if the muzzle speed is 478, how far from the bottom of the cliff does the bullet strike the surface of the lake
January 25, 2015

Ethics (last question)
Thank you, Reed!
January 21, 2015

Ethics (last question)
I'm having a tough time with these two questions. I think I have it, based on the indicator, but I'm not positive that the reason that I listed is correct. Argument: 1) Anything is possible (you agree?) Therefore, it must be possible that something is impossible. This ...
January 21, 2015

Math
6% of what number is 10 1/2? Who would you solve this question?
January 21, 2015

Ethics
Thank you Ms. Sue!
January 21, 2015

Ethics
Are my answers correct? Please help. Thank you! 18-20) Some arguments have complex premises, where too much information is given. Outline the following argument. Some matters of foreign policy are just beyond George W. Bush’s grasp, for, like in the matter of the prison ...
January 21, 2015

velocity
A 0.156 kg ice puck collides with a 0.170 kg ice puck. Both were originally moving at the same speed. Which one has the larger change in velocity? Or do they have the same change in velocity?
January 15, 2015

Finite Math
The quantity demanded x of a certain brand of DVD player is 3000/week when the unit price p is $485. For each decrease in unit price of $20 below $485, the quantity demanded increases by 250 units. The suppliers will not market any DVD players if the unit price is $350 or ...
January 13, 2015

physics
A racing car has a mass of 1970 kg. The acceleration of gravity is 9.8 m/s^2. What is its kinetic energy if it has a speed of 102 km/h? Answer in units of J.
January 11, 2015

Chemistry
If 0.45 M of ammonia solution has a pH of 9.20, what is the H+ concentration of the solution?
January 10, 2015

Physics and Math
The given answer is root over 2000
January 8, 2015

Physics and Math
[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
January 8, 2015

Last 3 QUESTIONS !!:( please
Thank you so much!
December 23, 2014

Last 3 QUESTIONS !!:( please
I meant 4 and my answers are 1) by approving both through the Compromise of 1877 2) The southern economy was quickly restored to pre-Civil War levels ?? 3) Lincoln read and established the Emancipation Proclamation 4)These amendments were stepping stones to economic equality ...
December 23, 2014

Last 3 QUESTIONS !!:( please
How did party leaders resolve the disputed election of Rutherford B. Hayes and southern demands for removal of troops in the South? by agreeing to home rule for the South and an investigation into the election practices in several states by disapproving both through the ...
December 23, 2014

Big History Test (Check) Part1.
Thank you(:
December 23, 2014

Big History Test (Check) Part1.
Please help me, I tried answering them my best. This isn't all the questions but I wanted to do --> check -- do --> check... then done. PLEASE
December 23, 2014

Big History Test (Check) Part1.
What was the chief goal of the Compromise of 1850? to resolve Texas's statehood issues to preserve the Union <-- to improve the economy in both the North and the South to preserve the balance between slave states and free states What theory promoted by Congressman ...
December 23, 2014

creative writing
Your welcome :D
December 23, 2014

creative writing
What is a Volta? Volta, can be used in reference to any type of literature, but is most frequently used in regard to poems, particularly sonnets. It comes from Italian and quite literally means ‘turn’, which is why you might hear it referred to as ‘the turn’...
December 23, 2014

creative writing
I think its C) a change or turn in the poem A turn in a sonnet is called a volta. A vital part of virtually all sonnets, the volta is most frequently encountered at the end of the octave (first eight lines in Petrarchan or Spenserian sonnets), or the end of the twelfth line in...
December 23, 2014

Math help...
I got it its 7/40.
December 23, 2014

Math help...
The length of a rectangle is 4/5 feet. The width is 5/8 feet. How much greater is the length of the rectangle than the width?
December 23, 2014

Math
6 9/8 - 25/6 = = 57/8 − 25/6 = ((57 × 6) − (25 × 8)) / (8 × 6) = (342 - 200) / 48 = 142/48 = 71/24 = 2 23/24
December 23, 2014

Math
13pi/12=________ degrees: Round to the nearest hundredth.
December 15, 2014

Math
Convert 35 degress to radian measure. Convert 250 degress to radian measure.
December 14, 2014

Spanish
Sra. are these better? La moraleja de la historia es no tratar de ser Dios. El primer rey trató de engañarle al otro rey en su laberinto. El rey estaba perdido y casi se murió. Se comprometió a castigar al primer rey en su propio laberinto. En su ...
December 11, 2014

Spanish
Sra. are these correct? Part I ¿Qué harías? Completa las oraciones siguientes en una manera lógica utilizando la forma CONDICIONAL. 1. Si fuera presidente… Si fuera preseident lo haría la gente sea agradable. 2. Si ganara la loterí...
December 11, 2014

Spanish
Sra. Are these correct? Part I ¿Pretérito o imperfecto del subjuntivo? Llene los espacios en blanco con la forma del PRETÉRITO o el IMPERFECTO DEL SUBJUNTIVO como apropiado. 1. Les pedí a ellos que __________ la factura inmediatamente. pagaran 2. ...
December 10, 2014

Chemistry
How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ? Please show all steps. i don't know where to start
December 9, 2014

math
nvm
December 6, 2014

math
so wait what grade are you in because you could help me with something
December 6, 2014

math
okey you did that right because you already did rounded
December 6, 2014

math
wait
December 6, 2014

math
(2.00) (10.00)(2.00)
December 6, 2014

Chemistry
For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule? helium oxygen carbon lithium Please explain why and thanks
December 2, 2014

Physics
Thank you
December 1, 2014

Physics
A rectangular trough, 2.0 m long, 0.50 m wide, and 0.50 m deep, is completely full of water. One end of the trough has a small drain plug right at the bottom edge. When you pull the plug, at what speed does water emerge from the hole? (in m/s) Hint: V = sqrt (2 g H I just don...
December 1, 2014

language Arts
B?
December 1, 2014

Chemistry
@DrBob222 Thanks! It really did help me understand it better
December 1, 2014

Chemistry
HW Help!!!! An object at 4500 K emits the blackbody spectrum shown here. This object emits the most light in the __?__ part of the visible spectrum.
December 1, 2014

Chemistry
The color of light emitted by a hot solid object depends on?
December 1, 2014

Chemistry
Given that many laboratory gases are sold in steel cylinders with a volume of 43.8 L, What mass (in grams) of argon is inside a cylinder whose pressure is 17810kPa at 24∘C? I've attempted this problem but I'm not getting the correct answer. Please explain if you ...
November 28, 2014

Chemistry
P= [14.5g*(0.0821L*atm/mol*K)*305K]/0.13L P=2792.98 P=2792.98*760mmHg = 2122664.8 g/mol*mmHg
November 28, 2014

Chemistry
If 14.5g of CO2 gas has a volume of 0.13L at 305K , what is its pressure in millimeters of mercury? I've plugged these values into the equation P=nRT/V but I am having troubles with canceling labels and getting the correct answer. Please explain as much as possible to me!
November 28, 2014

Spanish
Thank you so much! I hope you have a wonderful holiday.
November 26, 2014

Spanish
Thank you Sra. I tried these three again. You were correct they are too complicated. I sometimes feel I need to add more information than necessary. 14. ¿Qué Hizo el jefe de correos al leer la carta? Al leer la carta el jefe de correos recogido dinero para Lecho...
November 26, 2014

Spanish
Hola Sra. This one is a bit long. I hope they are correct. Part I Los pronombres relativos. Complete las oraciones siguientes en una manera lógica. Juan es el hombre a quien… Juan es el hombre a quien necesito dar el dinero. 1. Es un problema que… Es un ...
November 26, 2014

MATH!!
Joe and Susan invested $1500 at Bank of America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their investment added $500 and invested in at Bank Bravo, at 5% compounded quarterly. a) What is the value of this ...
November 24, 2014

MATH!
Thank you very much!
November 24, 2014

MATH!
Barbara invested $12,300 at the Midtown Credit Union at 6% compounded monthly for 7 years. What is the effective rate of this investment?
November 24, 2014

Social Studies
Which of the following is the largest ethnic group in china A.Han B.tibetan C. Uighurs D. Hui Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat Crops grow well on the north China plain because the Huang river ___ A. Forms...
November 24, 2014

Chemistry
Use bond energy values to estimate delta H fro the following reaction in the gas phase: C2H4 + Br2 -> CH2BrCH2Br I am in dire need of help! Thank you
November 20, 2014

Spanish
Hola Sra. Are these correct? La tercera persona plural de pretérito. Cambie las formas entre comillas al pretérito según el ejemplo. Ejemplo: No “han podido” sacar dinero de la máquina. No pudieron sacar dinero de la máquina. Esos ...
November 20, 2014

Math
The ratio of guys to girls in the classroom is 8:1. There are 45 people in the classroom. How many of them are guys?
November 20, 2014

history
what proposal sought to unite the American colonies against the french
November 19, 2014

Math Elementary Linear Algebra
determine whether or not the given set forms a basis for the indicated subspace: #1 {1,1,0), (1,1,1)} for the subspace of R^3 of all (x,y,z) such that y= x+z #2 {[1,2,-1,3), (0,0,0,0)} for the subspace of R^4 of all vectors of the form (a,b, a-b,a+b) and #3 {(2,0,2), (1,1,1)} ...
November 16, 2014

math
when a traffic light turns green, a car accelerates at a constant rate, the decelerates in the same manner to stop at the next traffic light. The speed of the car, s, is given by the equation, s=-10 /t-8/ + 80 where t is time. Find the time , t, it takes for the car to reach ...
November 16, 2014

Math
show that the set of all m-vectors whose first components is 0 (of R^m)
November 16, 2014

Chemistry
What is the molarity of a solution prepared by dissolving 820. g of sodium phosphate, Na3PO4, in water and diluting to 2.89 liters? (atomic masses: Na = 22.99, P = 30.97, O = 16.00)
November 14, 2014

Spanish
Sra. do these look correct? ¿Cuánto tiempo hace que…? Conteste las preguntas utilizando frases completas en español. 1) ¿Cuánto tiempo hace que has escrito una carta a mano? ¿A quién la escribiste y por qué? Hace ...
November 14, 2014

geomerty
how to find the distance between each pair of points (0,3)and (3,-5)
November 14, 2014

Biology*STUCK*
1.b 2.c 3.c
November 12, 2014

Chemistry
Consider the evaporation of water at 298 K and 1 atm pressure: H20 (l) <---> H20 (g) Given that ΔGOrxn= 8.6kJ/mol, what is the equillibrium vapor pressure of water at 298 K?
November 10, 2014

Chemistry
Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?
November 9, 2014

Chemistry
Please disregard this question. It's been answered: BaCl2 + Na2S \-> BaS + 2 NaCl
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...
November 7, 2014

Chemistry
Thank you Dr. Bob, I appreciate your help. I will look at the link. :D
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \->(NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \-> Cu(NO3)2 + 2 NH4Cl Sr(NO3)2...
November 7, 2014

Chemistry
A salt may be prepared by the reaction of one salt with another salt, particularly if one of the products is insoluble. In which one of the following reactions is this demonstrated? (NH4)2CO3 + K2SO4 \(->NH4)2SO4 + K2CO3 CuCl2 + 2 NH4NO3 \->Cu(NO3)2 + 2 NH4Cl Sr(NO3)2 + ...
November 7, 2014

Spanish
Sra. do my answers look correct? Querida Abby… Complete el párrafo abajo por escoger una palabra lógica de la lista siguiente para llenar los espacios en blanco. Querida Abby, Tengo un problema. No sé qué debo ___(1)____. Recientemente, mi ...
November 7, 2014

chemistry
Rank the following elements by electron affinity, from most positive to most negative EA value: tellurium, bismuth, neon, sodium, iodine i tried Te, Bi, Na, I, Ne and it was incorrect.
November 6, 2014

chemistry
K(s)+NH3(g)→ ?
November 5, 2014

Math
2/7
November 5, 2014

trigo
a bicycle has a front wheel with a diameter of 24cm and a back wheel with a diameter of 60cm. through what angle does the front wheel turn if the back wheel turns through 12 radians
November 5, 2014

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