Friday
November 21, 2014

Posts by Andres


Total # Posts: 65

physics
Consider two masses m1 and m2, connected by a spring of spring constant k and an uncompressed length L. The masses are on a frictionless surface. Initially, m2 compresses the spring to L/2 length. At t=0 the system is released. Find the position of the center of mass of the ...
October 28, 2014

HISTORY
1. Discuss the influence of World War I and its aftermath on the arts. Explain what events or experiences inspired artists of all kinds to experiment with new approaches. Then describe the changes that came about in two of the following fields—painting, music, and ...
October 9, 2014

physics
An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that a person inside is stuck to the wall and does not slide down when the floor drops away. The acceleration of gravity is 9.8 m/s2 .Given g = 9.8 m/s2, the coefficient μ...
October 14, 2013

physics
Pete slides a crate up a ramp at an angle of 25◦ by exerting a 290 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.28. How much work did Pete do when the crate was raised a vertical distance of 2.24 m? Answer in units of J
October 14, 2013

chemistry
you are welcome !!
March 23, 2013

chemistry
la energia balistica es igual al cambio de energia de transicion. qv= kz^2((1/nf^2)-(1/ni^2))) solo hay una emision del espectro, entonces la energia balistica solo es capaz de exictar del estado n=1 al estado n=2: qv= kz^2((1/2^2)-(1/1^2)))=3/4*kz^2 z=((1.641e-9*91.9)/(0.75*2...
March 23, 2013

Chemistry
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 2, 2012

Chemistry
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 2, 2012

Chemistry
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 2, 2012

Chemistry
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 2, 2012

Chemistry
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 2, 2012

Chemistry/Electrochem
A concentration cell is built based on the following half reaction: Zn(2+) + 2e(-) > Zn E(o)=-0.761 Using two pieces of zinc of electrodes (each 100.0 g), two Zn(2+) solutions, 0.101M and 0.427M (both exactly 1.00 L in volume), and all the other materials needed for a ...
October 1, 2012

Chemistry/Electrochem
Consider a cell at 299K: line notation Fe-Fe2+(1.39)--Cd2+(2.35)-Cd Given the overall standard reduction potential of the cell is -0.038. What will the concentration of the Cd2+ solution be when the cell is dead?
October 1, 2012

Chemistry/Electrochem
Consider a cell at 255 K: line notation Pb-Pb2+(1.27M)--Fe3+(2.29M)-Fe Given the standard reduction potentials calculate the cell potential after the reaction operated long enough for Fe3+ to have changed by 1.432M? I know that Fe3+ is the cathode which will decrease in ...
October 1, 2012

Physics
Heather and Matthew walk eastward with a speed of 0.78 m/s east. If it takes them 29 min to walk to the store, how far have they walked? Answer in units of km
September 4, 2012

Physics
Heather and Matthew walk eastward with a speed of 0.78 m/s east. If it takes them 29 min to walk to the store, how far have they walked? Answer in units of km
September 4, 2012

Physics
Heather and Matthew walk eastward with a speed of 0.78 m/s east. If it takes them 29 min to walk to the store, how far have they walked? Answer in units of km
September 4, 2012

Math
6x-3y = -6 and -5x + 7y = 41 I got stuck on this problem and my answers are outrageous so please help?
March 5, 2012

Math
6x-3y = -6 and -5x + 7y = 41
March 5, 2012

Calculus
The graphs of f(x) = x^3 and g(x) = 3X+5 have one intersection point. Determine the x-value for this intersection point using Newton's Method with an initial estimate of X1=2. You should use this method three times in order to obtain estimates X2, X3, and X4.
November 17, 2011

Chemistry
If an atom gains energy, is it in a more stable or unstable state?
November 9, 2011

Chemistry
You dissolve 0.213 g of acid in 25.0 mL of water. To react the acidic solution to the endpoint you add 23.80 mL of 0.1024 M NaOH. Determine the molar mass of the acid.
October 28, 2011

Chemistry
You dissolve 0.213 g of acid in 25.0 mL of water. To react the acidic solution to the endpoint you add 23.80 mL of 0.1024 M NaOH. Determine the molar mass of the acid.
October 28, 2011

Chemistry
You dissolve 0.213 g of acid in 25.0 mL of water. To react the acidic solution to the endpoint you add 23.80 mL of 0.1024 M NaOH. Determine the molar mass of the acid.
October 28, 2011

Chemistry
4.0 L of hydrogen gas reacts with 2.0 L of nitrogen gas (at the same temperature and pressure), producing ammonia gas, NH3. Find the limiting reactant.
October 25, 2011

Chemistry
Calculate the sodium ion concentration when 50.0 mL of 2.0 M Na2CO3 is added to 100.0 mL of 3.0 M NaHCO3
October 25, 2011

Calc
A farmer wishes to enclose a rectangular pen with area 100 square feet next to a road. The fence along the road is to be reinforced and costs $34 per foot. Fencing that coast $16 per foot can be used for the other three sides. What dimensions for the pen will minimize the cost...
October 13, 2011

Calc
A farmer wishes to enclose a rectangular pen with area 100 square feet next to a road. The fence along the road is to be reinforced and costs $34 per foot. Fencing that coast $16 per foot can be used for the other three sides. What dimensions for the pen will minimize the cost...
October 12, 2011

calc
A farmer wishes to enclose a rectangular pen with area 100 square feet next to a road. The fence along the road is to be reinforced and costs $34 per foot. Fencing that coast $16 per foot can be used for the other three sides. What dimensions for the pen will minimize the cost...
October 12, 2011

Calculus
Determine the x-value for each inflection point on the graph of the following function. f(x)=3x^5-5x^4-80x^3+360x^2+1000x+850
October 12, 2011

Calculus
Determine the x-value for each inflection point on the graph of the following function. f(x)=3x^5-5x^4-80x^3+360x^2+1000x+850
October 12, 2011

Calc
so would the inflection point be x=-3 because thats where it goes from decreasing to increasing
October 12, 2011

Calc
Determine the x-value for each inflection point on the graph of the following function. f(x)=3x^5-5x^4-80x^3+360x^2+1000x+850
October 12, 2011

Calc
Suppose Y1 is a function of x which dy1/dx=3y1. Suppose y2 is a function of x which dy2/dx=8x+5. If the graphs of y1 and y2 have the same y-intercept and they intersect at x=2, then determine the value of the y-intercept.
October 11, 2011

Calc
an observer stands 200 m from the launch site of a hot-air balloon. the balloon rises vertically at a constant rate of 4 m/s. how fast is the angle of elevation increasing 30 s after the launch.
October 10, 2011

Calculus
an observer stands 200 m from the launch site of a hot-air balloon. the balloon rises vertically at a constant rate of 4 m/s. how fast is the angle of elevation increasing 30 s after the launch.
October 10, 2011

Calculus
an observer stands 200 m from the launch site of a hot-air balloon. the balloon rises vertically at a constant rate of 4 m/s. how fast is the angle of elevation increasing 30 s after the launch.
October 10, 2011

integrated math 2
I have a triangle with the base of 11 and all the sides look about the same but i dont know how to find out the height?
September 11, 2011

Chemistry
How many oxygen atoms are in 6.70 g of Al2(SO4)3? Express your answer using scientific notation with two decimal places.
September 4, 2011

Chemistry
How many oxygen atoms are in 6.70 g of Al2(SO4)3? Express your answer using scientific notation with two decimal places.
September 4, 2011

Chemistry
How many oxygen atoms are in 6.70 g of Al2(SO4)3? Express your answer using scientific notation with two decimal places.
September 4, 2011

Chemistry
How many oxygen atoms are in 6.70 g of Al2(SO4)3? Express your answer using scientific notation with two decimal places.
September 4, 2011

Trigonometry
thanks
August 28, 2011

Trigonometry
determine real numbers a and b so that the expression 8sin^2(theta) + 2cos^2(theta) can be rewritten as asin^2(theta) + b I just need help in how to start it.
August 28, 2011

Trigonometry
determine real numbers a and b so that the expression 8sin^2(theta) + 2cos^2(theta) can be rewritten as (a)sin^2(theta) + b? If you can help me out on how to start it would be great.
August 28, 2011

History
1. Discuss the influence of World War I and its aftermath on the arts. Explain what events or experiences inspired artists of all kinds to experiment with new approaches. Then describe the changes that came about in two of the following fields—painting, music, and ...
January 14, 2011

Algebra 1
86
November 28, 2010

psychology
An example of ______________ would be if you argue that most behaviors are a product of your environment and your friend argues that behaviors are a result of heredity
November 1, 2010

physics
A picture hangs motionless on a wall as shown in the Figure. If the picture has a mass of 5.0 kg, what are the tension forces in the wires?
October 22, 2010

Math
hggg\
October 17, 2010

physics
A rock is tossed straight up with a velocity of 34.0 m/s. When it returns, it falls into a hole 17.3 m deep. What is the rock's velocity as it hits the bottom of the hole? How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
October 8, 2010

physics
Larry leaves home at 1:01 and runs at a constant speed to the lamppost. He reaches the lamppost at 1:10, immediately turns, and runs to the tree. Larry arrives at the tree at 1:26. What is Larry's average velocity during his trip from home to the lamppost, if the lamppost ...
October 8, 2010

physics
A speedboat starts from rest and accelerates at +1.99 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.515 m/s2. Following this, the boat accelerates at -1.44 m/s2 for 8.00 s. What is the velocity of the boat at t...
October 8, 2010

physics
A speedboat starts from rest and accelerates at +1.99 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.515 m/s2. Following this, the boat accelerates at -1.44 m/s2 for 8.00 s. What is the velocity of the boat at t...
October 8, 2010

e-mail begin
Are there any users of g-mail out there who would be willing to tell me what they think of this service from google? Besides that, I am thinking of setting up a new account with them. How would I do that? Anything you could tell that would facilitate me getting started with ...
September 30, 2010

history
when evaluating a web rescource wich terms refers to weather the information is realiable or error free? a. accuracy b. authority c. coverage d. objectivity
February 3, 2010

math
what is congruent?
February 2, 2010

Algebra 2
4Xsquared+7x+3 find the quadratic equation by factoring to solve. Show work
November 9, 2009

algebra 1
The owner of the Fancy Food Shoppe wants to mix cashews selling at $8.00/kg and pecans selling at $7.00/kg. How many kg of each kind of nut should be mixed to get 8 kg worth $7.25/kg?
March 8, 2009

social studies
What are the governor's duties?
November 13, 2008

2nd grade
Why do cities and states need laws?
November 13, 2008

5th grade math
what is a product
October 27, 2008

hardware
CPU, memory,
August 15, 2008

math
i have been studying square roots and still dont understand it...i need more examples ..like how do i find the square root of 7....
July 31, 2008

Math
) In an experiment, a pair of dice is rolled and the total number of points observed. (a) List the elements of the sample space (b) If A = { 2, 3, 4, 7, 8, 9, 10} and B = {4, 5, 6, 7, 8} list the outcomes which comprise each of the following events and also express the events ...
March 25, 2007

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