Tuesday
September 23, 2014

Posts by Kyle


Total # Posts: 754

physics (fixed)
Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.34 kg and a speed of 1.1 m/s . Cart 2 has a mass of 0.68 kg and a speed of 0.55 m/s. Calculate the system's kinetic energy.
March 17, 2010

physics
Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.34 kg and a speed of 1.1 m/s . Cart 2 has a mass of 0.68 kg and a speed of 0.55 m/s .
March 17, 2010

physics
You are holding a shopping basket at the grocery store with two 0.69-kg cartons of cereal at the left end of the basket. The basket is 0.90 m long. Where should you place a 1.8-kg half gallon of milk, relative to the left end of the basket, so that the center of mass of your ...
March 17, 2010

physics
Two 72.0-kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?
March 17, 2010

College Physics
You are holding a shopping basket at the grocery store with two 0.69-kg cartons of cereal at the left end of the basket. The basket is 0.90 m long. Where should you place a 1.8-kg half gallon of milk, relative to the left end of the basket, so that the center of mass of your ...
March 16, 2010

College Physics
Two 72.0-kg hockey players skating at 7.00 m/s collide and stick together. If the angle between their initial directions was 130 degrees , what is their speed after the collision?
March 16, 2010

College Physics
During a rescue operation, a 5600-kg helicopter hovers above a fixed point. The helicopter blades send air downward with a speed of 69 m/s. What mass of air must pass through the blades every second to produce enough thrust for the helicopter to hover?
March 16, 2010

Calculus 2
i need to find the amount of gallons of different water heights on a Horizontal tank with Elliptical Cross-Sections minor axis height is 4 minor axis length is 6 tank length is 16
March 16, 2010

Calculus 2
i need to find the amount of gallons of different water heights on a Horizontal tank with Elliptical Cross-Sections minor axis height is 4 minor axis length is 6 tank length is 16
March 16, 2010

Math
how do I solve; two parallelograms have the same base length. The height of the first is half the height of the second. What is the ratio of the area of the smaller parallelogram to the area of the larger one?
March 9, 2010

Math
how do I solve; two parallelograms have the same base length. The height of the first is half the height of the second. What is the ratio of the area of the smaller parallelogram to the area of the larger one?
March 9, 2010

Math
would you use centimeter or millimeter for width of your finger
March 4, 2010

College Physics
Part A) A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance ...
March 3, 2010

College Physics
There are 3 portions. The next one is at 0.50 m and the last one is when the rock is at 1.0 m.
March 3, 2010

College Physics
A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance on the ...
March 3, 2010

physics
Thank you sir. I appreciate it.
March 2, 2010

physics
In order to keep a leaking ship from sinking, it is necessary to pump 11.0 lb of water each second from below deck up a height of 2.50 m and over the side. What is the minimum horsepower motor that can be used to save the ship?
March 2, 2010

World History
How did colonies with large European populations differ from other colonies?
February 22, 2010

Rate Laws
If the initial concentration of AB is 0.210 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75 s? The reaction is in the second order: rate=k[AB]^2 The rate constant is k=5.4*10^2 M*s I don't understand how to find A...
February 20, 2010

Math
There is a list of triominoes: 0,5,5... 0,1,1... 1,1,3... you get the picture. There are 10 triangles. How am I suppose find the measure of the largest angle? How many sides are congruent? I think 2 but are the talking about the entire triomino?
February 18, 2010

Math
how to clasify by angles... x, 60 degress, 61 degrees = so I add 60 to 61 and it equals 121 so does that mean its a obtuse angle? I have one moe question, I'll post it.
February 18, 2010

Math
no
February 13, 2010

Math
9x-(-6x-4)=-5
February 9, 2010

calc
Suppose the total cost, C(q), of producing a quantity q of a product is given by the equation C(q) = 5000 + 5q The average cost per unit quantity, A(q), equals the total cost, C(q), divided by the quantity produced, q. Find the limiting value of the average cost per unit as q ...
February 8, 2010

math
how do I solve and state if it is an overestimate or an underestimate? 1.2% of 490 Do I .012 x 490 or Do I round 1.2% to 1
February 4, 2010

math
I need help finding the answer In the US about 46% of the population wear glasses or contact lenses. A sample of 85 people is taken. About how many people would you ecpect to wear glasses or contact lenses? Do I multiply .46 to 85?
February 3, 2010

mole fraction
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 241 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction of hexane? (Assume ideal ...
January 30, 2010

Molality
An aqueous solution contains 8.7% NaCl by mass. 1. Calculate the molality of the solution. 2. Calculate the mole fraction of the solution.
January 30, 2010

Math
I get it now! Thanks everyone!!!
January 29, 2010

Math
I'm still needing some help knowing how to work this proportion. A glacier moves about 12 inches every 36 hours. About how far does the glacier move in 1 week? Is it 12 in / 36 hrs = x/week (in hours)
January 29, 2010

Math
Can you explain how you work the problem? I know its a proportion but I don't get it?
January 29, 2010

Math
A glacier moves about 12 inches every 36 hours. About how far does the glacier move in 1 week?
January 29, 2010

math
How do I solve: write 45.6 as a percent and a fraction in simplest form.
January 27, 2010

math
unit rate in fraction form:2.40 per dozen
January 26, 2010

algebra
who do i solve this equation 49x-y=558
January 25, 2010

algebra
I am not sure how to solve this equation 49x-y=558
January 25, 2010

math 7th
+2 -10
January 21, 2010

history
hi i need a lot of sources about the history of throwing coins into fountains
January 18, 2010

Physics
A student wants to run an experiment to determine how the distribution of mass (location of mass) affects an object`s rotational velocity. For this experiment the student picks 3 rings. One is a wood ring (like a hula-hoop) with all of its mass at the outer edge (A). The next ...
January 17, 2010

Calculating Vapor Pressure
The vapor pressure of nitrogen at several different temperatures is shown below. Temperature (K) Pressure (Torr) 65 130.5 70 289.5 75 570.8 80 1028 85 1718 1. Use the data to determine the heat of vaporization of nitrogen in kJ/mol. 2.Determine the normal boiling point of ...
January 17, 2010

heat of vaporization
Suppose that 1.00 g of rubbing alcohol (C3H8O) evaporates from a 54.0 g aluminum block. If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the ...
January 16, 2010

physics
5. K =5 J since the only force acting on it is gravity, it's a conservative force. That means the energy is only transferred from U to KE and never lost. We use the formula: E= U + KE At its max displacement, KE=0 and E must equal U. It says that at its max displacement U=...
January 5, 2010

S.S.
What is an Assyrian Library?
December 13, 2009

math
write an equation in point-slope form for the line through the given point with the given slope (4, -6); m = 3 over 5
December 13, 2009

Earth Science
Broad areas of folded rock layers that resemble a bowl turned right-side up are called
December 10, 2009

Chemistry
sorry. Determine the molar mass of the unknown acid. Determine the molecular formula of this acid.
December 6, 2009

Chemistry
Determine the molar mass of the unknown acid.? A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.
December 6, 2009

Chemistry
Determine the molar mass of the unknown acid.? A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.
December 5, 2009

Physics
bobpursley forgot to put the second mass in the equation. whenever there is a v^2/r , remember to multiply it by mass. tension[low] = mg + (v^2/r * m) tension[high] = (v^2/r * m) - mg
December 5, 2009

Lattice Energy
Arrange the following substances in order of decreasing magnitude of lattice energy. KCl NaF SrO BaO
December 5, 2009

physics
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?
December 3, 2009

physics
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?
December 3, 2009

biology
how are babies made?
November 26, 2009

math
Use two points on any horizontal line to illustrate why a horizontal line has a slope of 0...I'm really confused. Can anyone answer with an explanation?
November 25, 2009

de Broglie Wavelength
The presence of oxygen atoms on the surface results in auger electrons with a kinetic energy of approximately 505 eV. What is the de Broglie wavelength of this electron? [KE= (1/2)mv^2; 1 electron volt (eV) = 1.602*10^-19 J]
November 13, 2009

Chemistry
Water is exposed to infrared radiation of wavelength 3.0×10^−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 1.7 g of water by 2.2 K?
November 9, 2009

Heat of Formation
0.04319 moles F3O4 Specific Heat Constant: 4.18 J/mol*C
November 6, 2009

Heat of Formation
I got 1518 kJ/mol using that equation, but I still got it wrong. Did I do something wrong?
November 6, 2009

Heat of Formation
When 10.00 g of iron is burned in O2(g)to form Fe3O4 (s) , enough heat is generated to raise the temperature of 784 g of water from 18.0 C to 38.0 C. Calculate the heat of formation of Fe3O4 (s) under these conditions in kJ/mol.
November 6, 2009

Chemistry Equations
What's the equation for the formation of NO2(g) from its elements in its standard states? What's the equation for the formation of BF3(g) from its elements in its standard states? What's the equation for the formation of C2H5OH(l) from its elements in its standard ...
November 5, 2009

12th grade Physics
Hi, actually Bob, your answer is not 30 degrees, but 60 degrees. 30 degrees does not refer to the angle inside the triangle formed by the x and y components.
November 4, 2009

Thermochemistry
w is work
October 30, 2009

Thermochemistry
Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.5 m/s and then collides straight-on with a second billiard ball of equal mass. The first billiard ball ...
October 30, 2009

chemistry
Predict the mass of gold formed when a gold (III) nitrate solution reacts completely with 125 mL of 0.352 mol/L sulfurous acid (aqueous hydrogen sulfite)
October 27, 2009

Reaction Stiochiometry Involving Gases
Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the following set of equations: CF3Cl + UV Light ---> CF3 + Cl Cl + O3 ---> ClO + O2 O3 + UV Light ---> O2 + O ClO + O ----> Cl + O2 What total volume of ozone measured at a pressure of 25.0 ...
October 25, 2009

Kinetic Molecular Theory
A sample of N2O effuses from a container in 48 seconds. How long would it take the same amount of gaseous I2 to effuse from the same container under identical conditions?
October 25, 2009

Chemistry
You wish to make a 0.200 M solution of NiSO4 (aq). How many grams of NiSO4 * 6H2O should you put in a 0.500 L volumetric flask? The answer is 26.3 g NiSO4 * 6H20 but I am not sure how to get there.
October 20, 2009

9th grade
I need an answer to my question in spanish Que vas a hacer despues de las clases hoy?
October 15, 2009

Spanish
Need an answer in Spanish to a spanish question! Que vas a hacer despues de las clases hoy?
October 15, 2009

Chemistry
A solution contains Cr+3 ion and Mg+2 ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.8 g. Find the mass of Cr+3 in the original solution.
October 12, 2009

Organic Chemistry
ahh I got it the C5 and O need to be double bonded
September 18, 2009

Organic Chemistry
oh thank you but when I tried it seems there is another structure in which all atoms have their octet
September 18, 2009

Organic Chemistry
like this? img198.imageshack .us/img198/7855/trialt.jpg
September 18, 2009

Organic Chemistry
img17.imageshack .us/img17/6517/cycloo.jpg
September 18, 2009

Organic Chemistry
I do have a picture but I can't show the url well I believe its a cyclopentdiene the number is going from the right the 1 is a oxygen and the 3 is CH+ and the double bond is located between 4 and 5
September 18, 2009

Organic Chemistry
ahh it didn't show o / \ \\ / -CH+
September 18, 2009

Organic Chemistry
ahh it didn't show
September 18, 2009

Organic Chemistry
Draw the most important resonance contributor of the following structure? I'm confused on this one o / \ double bond -> \\ / - CH+
September 18, 2009

Physics
Atomic physicists ignore the effect of gravity within an atom. To see why, Calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10^-10 m.
September 9, 2009

science
how it is
August 25, 2009

History
What do think I'll learn by interviewing a teacher about their school? Here are the questions I asked the teacher: Kearsney is the name of the school Where and when were you born? How would you describe your childhood? What was your ambition growing up? What did you study ...
August 9, 2009

History
What questions could you ask a person about there life story if you had to interview them?
July 20, 2009

History
Can someone please help me make a biography of a person about there old high school? Ok I'm interviewing a person about his life at his old high school. I've split it into 4 steps. Introduction Transcript Conclusion Introduction: It should be a life story of the ...
July 20, 2009

social studies
after the 1800's what type of manufacturing was chicago know for?
June 2, 2009

capitalization
New Year's day occurs on January the first. Numbers under 100 need to be written out.
June 1, 2009

capitalization
Yes this is right.
June 1, 2009

capitalization
John Grisam is the author of "The Street Lawyer."
June 1, 2009

Algebra
How do you do this? Which binomial is a fctor of 3x^2+2^x-5? A: 3x-1 B: x-1 C: 3x-5 D: x-5 I know you tried to help but it wasn't right but thanks.
June 1, 2009

Algebra
Which binomial is a factor of 3x^2+2x-5?
June 1, 2009

physics
an object held in the air has a gpe of 470 J. the object then is dropped. halfway down, what is the objects kinetic energy?
May 25, 2009

Physics
A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?
May 16, 2009

Physics
A tall glass (20cm) is floating in your bathtub. It weighs 60 grams and has a bottom area of 10cm^2. How deep will it sink into the water, while it is still empty and how much water can you add to make it sink?
May 5, 2009

to kill a mockingbird
what new things dose scout learn here about how the black people live
May 4, 2009

spanish to english
do you mean like soccer and basketbal
April 22, 2009

spanish to english
dos deportes que necesitan bola a pelota son
April 22, 2009

Physics
A 
serving 
of 
cereal 
has 
800
cal 
(1
cal
=
.239
J). 
How
 far
can 
you 
walk
 with
 this 
energy?
 Is 
the 
elapsed 
time
...
April 15, 2009

science
how do you find the wet bulb depression if they don't give any other info.
March 30, 2009

history
so would it be C
March 26, 2009

history
A.Southerners D. urban political machines B.Suburbanites E. labor C.Blacks I think it is D
March 26, 2009

history
the choices are A. Southerners D. urban political machines B. Suburbanites E. labor C. Blacks I think it is D
March 26, 2009

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