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December 18, 2014

Posts by JEFF


Total # Posts: 644

Chem
I know how to make soap, using lye. I want to be able to make the lye solution from wood ash be the same ph as commercial lye. I think this can be done using the ph of sodium hydroxide in water as I first stated. Is it possible to compute this ph.
February 28, 2011

Chem
What is the PH range between 58 grams and 87 grams of Sodium Hydroxide in 6 oz by volume of water. What is the PH range of that amount of Sodium Hydroxide in 8 oz of water. I need this information to learn to make soap using wood ash.
February 28, 2011

AP Physics
The initial kinetic energy imparted to a 0.72 kg bullet is 1777 J.The acceleration of gravity is 9.81 m/s2. Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained. Answer in units of km.
February 26, 2011

Ma
Autoparts Inc. produces three types of parts' assemblies: (P,Q,R)and they each require (2,5,3) units of work on machine I and (2,2,4) units of work on machine II respectively. The two machines have respectively (160,190) units of work available per day. It is given that ...
February 26, 2011

AP Physics
27. a)In the 1950’s, an experimental train that had a mass of 32800 kg was powered across a level track by a jet engine that produced a thrust of 4.37× 10^5 N for a distance of 465 m.Find the work done on the train. Answer in units of J. b)Find the change in kinetic...
February 26, 2011

AP Physics
22. a)You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 20000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.19 m and the cannon is aimed at a 32 angle from the ...
February 26, 2011

AP Physics
A student weighing 700 N climbs at constant speed to the top of an 8 m vertical rope in 10 s. The average power expended by the student to overcome gravity is most nearly 1. P = 560 W. 2. P = 87.5 W. 3. P = 5, 600 W. 4. P = 1.1 W. 5. P = 875 W.
February 26, 2011

AP Physics
15. A 3.0 kg block is pushed 3.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 30.0 with the horizontal, as shown in the figure. The acceleration of gravity is 9.81 m/s2. If the coefficient of kinetic friction between the block and...
February 26, 2011

AP Physics
6. a)A 1260 kg car accelerates uniformly from rest to 4.65 m/s in 2.6 s. Find the work done on the car in this time.Answer in units of J. b)Find the average power delivered by the engine in the first 1.768 s. Answer in units of W. c)Find the instantaneous power delivered by ...
February 26, 2011

ap Physics
1. a)A 15.6 kg block is dragged over a rough, horizontal surface by a constant force of 72.2 N acting at an angle of angle 34.8 above the horizontal. The block is displaced 24.6 m and the coefficient of kinetic friction is 0.234.Find the work done by the 72.2 N force.The ...
February 26, 2011

Economics
Rank in order from best to worst, the economic systems(command, market and mixed) according to which, in theory, best attempts to meet the conditions of The Human Development Index. Why did you rank them this way. I am thinking (in theory): 1-command 2-mixed 3-market The The ...
February 14, 2011

Economics
I have to fill in the following for a fascist economy. Ownership of resources = private Philosophers= Karl Marx (are there more?) Role of government= to controls production and allocation of resources Reaction to social and technological Change= don't know Role of nature= ...
February 10, 2011

word problem
a computer company gives a discount of 10% on a new piece of software.If it makes a 40% profit what percentage does the marked price exceed the cost price
February 5, 2011

physics
497
February 3, 2011

8th grade History
Around the town of Gettysburg, Pennsylvania...
February 3, 2011

Economics
I am given four pictures and I am asked to determine which are needs and which are wants. They are: -An airplane -A plate of breakfast(eggs, toast, beacon) -A child's bed -A sports car I think: airplane= want plate of breakfast= need Child's bed= need sports car = want...
February 3, 2011

Chem II
For the reaction H2+I2, Kc=55.3 at 700K. In a 2. L flask containing an equilibrium mixture of three gases, there are .056g H2 and 4.36 g I2. What is the mass of the I2 in the flask?
January 31, 2011

Chemistry
Lead(II) nitrate solution reacts with potassium iodide solution to produce lead(II) iodide and potassium nitrate. The answer in the book is: Pb(NO3)2(aq) + 2 KI(aq) ---> 2KNO3(aq) + PbI2(s) I understand how to write and balance the equation. However, I am confused about how...
January 28, 2011

math
A manufacturer of light bulbs knows that 3% of the production of their 60W bulbs will be defective. What is the probability that exactly 5 bulbs in a carton of 144 will ne defective? Did not understand the posted answer before, need it simplified.
January 26, 2011

math
did not understand your answer?
January 26, 2011

math
A manufacturer of light bulbs knows that 3% of the production of their 60W bulbs will be defective. What is the probability that exactly 5 bulbs in a carton of 144 will ne defective?
January 26, 2011

math (trig)
if cos 2 theta = -(1/3) and theta is in Quadrant 2, find sin theta, cos theta, tan theta, and draw triangle theta
January 20, 2011

trig
If sin 2 theta = (2/5) in Quadrant 2, find sin theta, cos theta, tan theta, and draw triangle theta.
January 20, 2011

math 65
how do i change a fraction to a decimal
January 18, 2011

Math
Sorry, whenever I post, the pattern does not come out right. There should be one "I" diagonally down and to the right and one to the left of B. Same pattern with all the other letters. Thanks
January 10, 2011

Math
How many different paths will spell the word BINOMIAL in the following arrangement(moving diagonally downwards to the left or right)? ...B ..I I .N N N O O O O .M M M ..I I ...A L L My Answer: Starting from B using Pascal's Triangle ...B ..1 1 .1 2 1 1 3 3 1 .4 6 4 .10 10...
January 10, 2011

Math
How many different paths will spell the word BINOMIAL in the following arrangement(moving diagonally downwards to the left or right)? B I I N N N O O O O M M M I I A L L My Answer: Starting from B using Pascal's Triangle B 1 1 1 2 1 1 3 3 1 4 6 4 10 10 20 20 20 There are ...
January 9, 2011

math
4 2/5 - 2 1/2 = P + 3/10
January 9, 2011

algebra
for a person 6 feet tall who weighs 200 pounds, find the value for k in the equation w = kh to the 3rd power
January 5, 2011

math
Latoya has 3/4 of a bag of popcorn. If she eats half of the popcorn at a movie , how much does she have left?
January 3, 2011

math
Rupert flew 3/16 of the way around the world, but George only flew 4/9 as far as Rupert how far around the world did George fly?
January 3, 2011

AP Calculus
A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6, .8) the particle has horizontal velocity dx/dt=3. what is its vertical velocity dy/dt at that point? a)-3.875 b0-3.75 c)-2.25 d03.75 e)3.875
December 15, 2010

math
Determine the domain and range of the function. 4-X^2 if x<0 f(x)= 4-2X if x≤x≤2 sqrt(x-2) If x>2
December 7, 2010

spanish
I have a question about this phrase translated to Spanish. "Well, yes. I enjoy studying Spanish very much." Is it this way? Pues si, yo estudio espanol mucho. or Pues si, yo estudiar espanol mucho. using the infinitive form of estudiar. Thank you.
November 30, 2010

chemistry
How many molecules are 100.00 grams of H2O?
November 29, 2010

chemistry
What is the mass of 5.00 moles of Pb(CH3COO)2?
November 29, 2010

physics
a 600 kg hammer of pile driver is lifted 2 meters above a piling head. what is the change in potential energy if the hammer is released, what will its speed at the instant it strikes the piling?
November 26, 2010

Math
Fine the size of the following matrix and its additive inverse matrix. Identify if it is a square, column, or row matrix: [ 2 -3 7 1 0 4 ]
November 25, 2010

math
I think you would need one of the variables because all that is telling me is 180 = 1/2bh . Are there any other variables listed?
November 17, 2010

math
This is about direct variation. The area a painter can paint varies directly with the amount of time he works. One morninig, he painted 204 ft² between 8 a.m. and 12:15 PM. Write a direct variation equation to describe the area y covered in x hours. The forumlua for ...
November 17, 2010

Trig
Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x + sin3x + sin4x + sin5x + sin6x) into a single Cotangent function. Using the sum-to-products, I was able to get remove some of the addition in attempts to get full multiplication, but I could not get the ...
November 16, 2010

math
Find the maximum area of a rectangle inscribed between the x-axis and f(x)=-x^4+3
November 15, 2010

Math
Find the periodic payment that will amount to the given sum under the given conditions: S=$150,000; interest is 6% compounded semiannually; payments are made at the end of each semiannual period for 11 years.
November 7, 2010

math
how would 3 neighbors divide a sharing a rectangle piece of land divide it into 24 equal pieces and what fraction of land would each get
November 4, 2010

chemistry
how many moles of sodium ions are present in 3.50 L of 0.400 M Na3PO4?
October 25, 2010

math
This pattern represents the SQUARE NUMBERS: 1,4,9,16,25,36...draw a picture or diagram to explain SQUARE NUMBERS.
October 25, 2010

science
How often do you water basil?
October 23, 2010

spanish
Help with spanish!!!! Have to put correct words in the banks. 2 of them will not be used.? Querida Beth: 1) (blank) esta todo bien y esperamos que 2) (blank) tambien lo este. 3) (blank) lo pensemos y lo conversemos, tu padre y yo no estamos contentos con tu viaje. 4) (blank) ...
October 18, 2010

Chemistry
When titrating an acid with a base, a dilute solution of the base is used. When titrating a base with an acid, a dilute solution of acid is used. Why are these titrations done with dilute solutions?
October 6, 2010

Chemistry
What volume of 0.5 N nitric acid would be required to completely neutralize 300 ml of 1.0 N sodium hydroxide?
October 6, 2010

Chemistry
If you had one gallon of concentrated hydrochloric acid (12 N) and added water to make dilute hydrochloric acid (6 N), how much dilute hydrochloric acid would you have?
October 6, 2010

physics
thank you !
October 5, 2010

chem
In the explosion of a hydrogen-filled balloon, 0.54 g of hydrogen reacted with 6.6 g of oxygen to form how many grams of water vapor?
October 4, 2010

marketing
Your team has been hired by ABC company’s senior management to conduct a research project. The company has 40 employees and has been in business for 25 years. The company offers sales & service on all sizes of new Xerox copiers. The company has been faced with decreasing ...
October 3, 2010

chemistry
Calculate the volume of 1.80 M \rm Na_3PO_4 in milliliters that contains 6.00 g of solute.
October 3, 2010

math figuire
Volts divided by the amount of resistance will give you the amps.
September 27, 2010

Biochem
The conc is 6.0M HCL
September 13, 2010

Physics
Two motorcycles are traveling due east with different velocities. However, 2.16 seconds later, they have the same velocity. During this 2.16-second interval, motorcycle A has an average acceleration of 1.30 m/s2 due east, while motorcycle B has an average acceleration of 19.4 ...
September 13, 2010

Pre Calc
From a committee of 6 people how many sub-committees of 3 can be formed, and with 7 people and with 8 people and with n people?
September 12, 2010

Pre Calc
How many triangle are determind by the vertices of a hexagon, heptagon, octagon, and n-gon?
September 12, 2010

Math
in salem, 42% of the registered voters are republicans and 44% are democrats. the other 217 are independents. how many registered voters are there in salem?
September 6, 2010

math
During a football game, two players try to tackle another play. One player applies a force of 50.0 N to the east. A second player applies a force of 120.0 N to the north. What is the total applied force? (Since force is a vector, you must give both the magnitude and direction...
September 5, 2010

Chemistry
A 4.50 g sample of LiCl at 250 C dissolves in 25.0 ml of water also at 25.0 C.? The final equilibrium temp of the resulting solution is 60.8 C. What is the enthalpy of solution, deltaHs, of LiCl expressed in kilojoules per mole.
September 5, 2010

CHEMISTRY
Explain why it is quantitatively not acceptable to titrate each of the vinegar samples with the NaOH titrant to the same dark pink endpoint?
August 27, 2010

algebra
The perimeter of a rectangle is 128m the length is 4m more than twice the width
August 23, 2010

statistics
which of the following statements are correct? a. a normal distribuiton is any distribution that is not unusual. b. the graph of a normal distribution is bell-shaped. c. if a population has a normal distribution, the mean and the median are not equal. d. the graph of a normal ...
August 16, 2010

statistics
indicate whether the given statement could apply to a data set consisting of 1,000 vlaues that are all differnt. a. the 29th percentile is greater thatn the 30th percentile b. the median is greater thatn the first quartile c. the third quartile is greater than the first ...
August 13, 2010

12th grade
The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?
July 20, 2010

physics
A big yo-yo(radius .2m, mass 20kg) has a string wrapped about its circumference. If yo-yo falls, how far does it fall in 2 seconds? (The yo-yo is shaped like a disk)
June 29, 2010

chemistry
100 million automobiles contains 1.1 kg of CFC-12 and leaks 25% of its CFC-12(CF2Cl2) into the atmosphere per year, how much Chlorine in kilograms is added to the atmosphere each year due to auto air conditioners?
June 28, 2010

economics
By 2008 the US trade deficit was still very large (roughly 5% of gross income) and our net debt position was around $5 trillion (over 1/3 of gross income). Unfortunately, it also appears that we have fallen into a major recession of uncertain duration and depth. Discuss the ...
June 23, 2010

Accounting
Imagine you have been selected by your manager to present a training session to a group of new employees. The new hires do not have accounting backgrounds and have little or no work history in a responsibility center. The purpose of this training session is to explain the ...
June 7, 2010

Physics
A hunter aims directly at a target (on the same level) 125m away. If the bullet leaves the gun at a speed of 227 m/s, by how much will it miss the target? I'm not sure how to approach this problem. I know I need to find the horizontal distance traveled, probably by finding...
June 3, 2010

Algebra 2
I meant to type this one: If the sine of an acute angle is 0.8, what is the sine of twice that angle? 1.60 or .64? Thanks
May 28, 2010

Algebra2
I got it, .5
May 28, 2010

Algebra2
Help How do I figure out: (cos 40)(cos20) - (sin 40)(Sin 20) Thank you
May 28, 2010

Right Hand Rule
a) west b) zero deflection c) up d) down
May 21, 2010

algebra 2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert. Example, teachers answer to the following was sin 315deg...
May 16, 2010

algebra2
Example, teachers answer to the following was sin 315deg = -sin 45deg = -sqrt2/2 I got a decimal answer.
May 15, 2010

algebra2
I am taking an online class, and cant understand why when I calculate ona ti84 plus an answer I get decimal answer and my teachers answer is sq root, is there something I am not doing on my calculator? How do I convert.
May 15, 2010

Chemistry
902 mL
May 15, 2010

statistics
The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?
May 14, 2010

Science
what is the relative location of the marine biome, specifically the ice cap biome?
May 13, 2010

chemistry
6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?
May 11, 2010

calculus
sum_(n=-1)^infinity(-1)^(n+1) (1/3)^n = 9/4~~2.25... How do you find that out? Is there a formula?
April 27, 2010

chemistry
Write a net equation for the reaction between aqueous solutions of HBr and NH3.
April 26, 2010

Finance
7.90%
April 21, 2010

math
Evaluate f(x)= 4x^2 - 2 for f(1/2)
April 19, 2010

managerial economics
a) Given total cost function as C=160+16Q+0.1Q(2){squared} and price equation P=96-0.4Q. Total Revenue function is R=PQ=96Q-0.4Q(2). The profit function is F=R-C=(96Q-0.4Q(2))-(160+16Q+0.1Q(2))=80Q-0.5Q(2)-160. Profit attains maximum when and is negative dF/dQ=0 and d(2)F/dQ(2...
April 11, 2010

chemistry
How many grams of oxygen are required to react with 0.128 lead(II) sulfide?
April 8, 2010

algebra
x – 2y = 6
April 8, 2010

Chemistry
This question is: How many orbitals are there in each of the following energy levels.. a) 1s b) 6p c) 10f d) 7d e) 5s Now.. do i use n^2 for the number of orbitals in each energy level? Ex. b) would be 36 OR can i state the number of orbitals in each sublevel using the shape? ...
April 4, 2010

Chemistry
Why do atoms display spectra?
April 3, 2010

chemistry
how did you get that?
March 21, 2010

Calculus
An isosceles triangle has a vertex at the origin. Determine the area of the largest such triangle that is bound by the function x^2 + 6y = 48. So, y=8 when x=0 making a vertical side equal to 8. I also determined that there is a zero at =/- the square root of 48, or ...
March 20, 2010

Calculus
The radius of a tank can not exceed 5m, and the height can not exceed 12 m. Is it possible to construct a tank with a volume of 900m^3? If it is possible, determine the minimum amount of material required to make the tank. When i solve it, the radius exceeds the restrictions...
March 19, 2010

physics
Evidence suggests that there are trillions of dollars' worth of minerals and metals buried in Near Earth Asteroids (the ones that come close to the Earth, not the ones in the asteroid belt between Mars and Jupiter). Many scientists think an asteroid mining mission is ...
March 18, 2010

Chemistry
I've been asked to find the IUPAC name for polyvinyl acetate. when i type it in google i keep getting butan-2-yl acetate. but isn't the IUPAC name for acetate ethanoate ..? so would the proper IUPAC name for PVA be butan-2-yl ethanoate?
March 9, 2010

Physics
What is the equation for work?
March 9, 2010

Middle school Math
Graph 3y-4=11 by finding intercept(s) How do you do this... Thanks
March 6, 2010

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