Tuesday
October 21, 2014

Posts by David


Total # Posts: 1,683

chemistry
Yeah. What did you get?
September 30, 2013

chemistry
So the answer would be 1233.5 joules?
September 30, 2013

chemistry
How?
September 30, 2013

chemistry
it says "how many joules of energy would be required to heat 29.8 grams of carbon from 25.5 C to 79.3 C. (s= .71 Joules / grams times carbon) & the formula is Q= M x C x delta T .
September 30, 2013

Biology
Glucose + Fructose=__________________. I am thinking it is sucrose or table sugar but I am not sure.
September 29, 2013

Math
In a certain Library, there are r bookcases with s shelves in each book case. If a total of b books is to be distributed among the shelves, What is the number of books per shelf? a) b/rs b) rb/s c) rsb d) r/s-b e) b/s-r
September 21, 2013

math
what is 1/3 of 1/2?
September 17, 2013

Lincoln middle
What does it mean when # are in () for instance (12)(3)=
September 3, 2013

pol 125 - American National Government
what extent the war on terror justifies the President's indefinite detention of "enemy combatants" without the possibility of the minimal judicial review protected by habeas corpus?
August 4, 2013

calculus
Solve the DE by using the Laplace transform: x''+x=cos(3t), x(0)=x'(0)=0
July 27, 2013

physics
A board that is 20 cm wide, 5 cm thick, and 3 m long has a density of 350 kg/m^3. The board is floating partially submerged in water do density 100 kg/m^3. What fraction of the volume of the board is floating above water?;
July 13, 2013

Elementary mechanics
(Q1) 2 forces act on a point object as follows: 100 at 170 and 100 at 50.Find the resultant force (a)110N at 50 (b)110N at 100 (c)100N at 110 (d) 100N at 50 (Q2) given 3 vectors a=-i-4j+2k,b=3i+2j-2k,c=2i-3j+k,Calculate a-(b-c) (a)-6(b)6(d)9(d)-9 (Q3)The resultant of vectors A...
July 12, 2013

Math
(2/25 +13/25) - (2/5 - 14/15)
July 8, 2013

(pls help) algebra
4x+y-32=1, 6x-y-4z=7, 10x+2y-6z=5 pls show me how to solve for x,y,z. Ans:xx=1.5,y=-2,z=1
July 8, 2013

(pls help) Trig
point P and Q are respectively 24m north and 7m east of point R. What is bearing of Q and P to the nearest whole degree.(a)52(b)164(c)134(d)159
July 7, 2013

statistics
6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in ...
June 23, 2013

statistics
The pucks used by the National Hockey League for ice hockey must weigh between 5.5 and 6.0 ounces. Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of 0.11 ounce. What percentage of the pucks ...
June 23, 2013

statistics
Page 1 of 2 4. Despite all efforts by the quality control department, the fabric made at Benton Corporation always contains a few defects. A certain type of fabric made at this corporation contains an average of .5 defects per 500 yards. Using the Poisson formula, find the ...
June 23, 2013

statistics
3. Magnetic resonance imaging (MRI) is a process that produces internal body images using a strong magnetic field. Some patients become claustrophobic and require sedation because they are required to lie within a small, enclosed space during the MRI test. Suppose 29% of all ...
June 23, 2013

statistics
2. Bender electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 100 boxes, each box containing 20 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...
June 23, 2013

Statistics
1. Let x be the number of heads obtained in two tosses of a coin. The following table lists the probability distribution of x. x 0 1 2 P(x) .25 .50 .25 Calculate the mean and standard deviation of x. Give a brief interpretation of the value of the mean.
June 23, 2013

physics PLEASE HELP!
what are three possible thicknesses that a soap film should be to transmit yellow light ? (Lambda=590nm)
June 15, 2013

Statistics
4. An environmental agency will randomly select 4 houses from a block containing 25 houses for a radon check. a) How many total selections are possible? b) How many permutations are possible?
June 11, 2013

Statistics
3. The following table gives a two-way classification of all basketball players at a university who began their college careers between 2004 and 2008, based on gender and whether or nor they graduated. Graduated Did Not Graduate Male 126 55 Female 133 32 a) P(female or did not...
June 11, 2013

Statistics
. Two thousand randomly selected adults were asked whether or not they have ever shopped on the internet. The following table gives a two-way classification of the responses obtained. Have shopped Have never shopped Male 500 700 Female 300 500 Suppose one adult is selected at ...
June 11, 2013

Statistics
1. The mean monthly mortgage paid by all home owners in a town is $2365 with a standard deviation of $340. a) Using Chebyshev’s theorem, find at least what percentage of all home owners in this town pay a monthly mortgage of (i) $1685 to $3045 & (ii) $1345 to $3385 b) ...
June 11, 2013

Accounting
A = 500000 b = 40
June 7, 2013

fundamentals
Calculate the total constant force needed to accelerate a vehicle with mass 1400kg and tractive resistance of 320N from 19km/h to 95km/h over a distance of 0.8km on a horizontal plane.show working?
June 5, 2013

fundamentals
A playground has its highest point 2.2m above the lowest point, and the slide is 4.9m long. If the average resistance to motion is one-fifth of the weight of the child(mass 40kg), find the speed at which the child reaches the bottom show working?
June 5, 2013

9/11
What was your response to the 9/11 attacks when you first found out about it? I need to interview some people and get their answers to this question.
June 4, 2013

Phyics Toughest question on earth
Dude Can`t Understand Please Help
June 4, 2013

physics
why does it take a longer time for a kilogram of water than a kilogram of copper to reach the same temperature?
May 29, 2013

Physics
Two forces act on a 55-kg object. One force has the magnitude 65 N directed 59 clockwise from the positive x-axis, and the other has a magnitude ofm35 N at 32 clockwise from the positive y axis. What is the magnitude of acceleration?
May 29, 2013

Ethics
HIPAA, GLB, and COPPA laws can help ensure people's privacy. What is their ethical justification? Is there gray area in these laws? How do some businesses try to find their way around these laws
May 24, 2013

math
If 1/cos - cos=a^3 and 1/sin - sin=b^3 Show that tan=a/b
May 19, 2013

ethics
ok well I'm just confused about the whole idea of "human moral predicament" and meta-ethical... I get that Nietzsche and Wittgenstein both have ways of showing what is good and bad, and they both have there reasons. But again, when it comes to the human moral ...
May 15, 2013

ethics
Both Nietzche and Wittgenstein raise the issue of the morality of morality. In other words, they ask "Why should someone be good?" Describe the different ways in which Wittgenstein and Nietzsche understand the human moral predicament i.e. the challenge of asserting ...
May 15, 2013

CHEMISTRY
how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?
May 9, 2013

CHEMISTRY
how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?
May 9, 2013

Math
What is the barbell method
May 7, 2013

VBS 2010
Write a Web program to calculate the discount rate and interest rate for a bond. If a bond is purchased for n dollars and sold one year later for m dollars, then the discount rate is m-2/m and the interest rate is m-n/n, where each is expressed as a percent.
May 5, 2013

Chemistry
Thank you !!
May 1, 2013

Chemistry
what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!
May 1, 2013

Chemistry
what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!
May 1, 2013

History/English
what does anti colonialist movements outside of america have to do with segregation?
April 28, 2013

Chemistry- Acid-base titration
The indicated endpoint of an acid-base titration seldom occurs at a ph of 7. what determines the ph of the endpoint??
April 24, 2013

Algebra/Number Theory
Solution 1: Since a2>b2+22, thus a>b. Since a and b are consecutive positive integers, we have a=b+1. Substituting in the above expression, we have (b+1)2=b2+2b+1>b2+22⇒b>22−12⇒b≥11. Thus a+b=2b+1≥2×11+1=23. Solution 2: Since a2&...
April 24, 2013

chemistry
A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
April 21, 2013

english
so its okay is i say-- The U.S. Involvement in Vietnam From 1945-1964
April 21, 2013

english
does the word "from" get capitalized in a title?
April 21, 2013

AP chemistry
A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...
April 21, 2013

Chemistry
A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...
April 21, 2013

Computer Science
What is the fastest way to compare two strings containing only numbers. eg: "3423492349328492343.939842903482304" "349832498234932.92384924893294343" There can be at max 20 numbers before and after the decimal place. The majority will be around 20, however ...
April 21, 2013

Math
84-64cos(theta)
April 21, 2013

Algebra
A shingle falls straight down from the roof of a building that is 144 feet tall. a. Use a vertical motion model to write an equation that gives the height h of the shingle t seconds after it falls. b. When does the shingle hit the ground? c. If the same shingle were dropped ...
April 18, 2013

Math
describe how you can use the graph of y=x^2 to graph the given function. y=2x^2 + 3 y=-3/4x^2 + 5
April 18, 2013

Math
THANK YOU !!!
April 18, 2013

HISTORY
What was the third force in Vietnam?
April 11, 2013

math
Two non-negative numbers are chosen such that their sum is 30. Find the numbers if the sum of their squares is to be a maximum. Explanation to solve this would help !
April 10, 2013

Life orientation
Critical ways in wich hiv/aids problem impacts on the community and relevant sources to support
April 10, 2013

history
Why was monolithic soviet communism an important idea for the reason why US supported Diem's regime in south vietnam from 1954-64? Give 4 reasons. I already have some but i just want some more ideas for brainstorming.
April 10, 2013

Pre algabra
write 121 to 4 feet as a ratio in lowest terms
April 9, 2013

Life science, history, geography, and maths literacy
BEST THING EVER
April 8, 2013

ap calculus
oh! the function is (2-5x)^3 i got the double derivative -15(2-5x)(-5)
April 7, 2013

ap calculus
-find the coordinates for all points of inflection . find all intervals on which function has upward or downward concavity? -i found to be 2/5
April 7, 2013

Math
actually is lim x->0 (1+x)^(1/x)=e. not lim x->infinity (1+x)^(1/x)=e.
April 6, 2013

Math
Given table, X ; (1+x)^(1/x) -0.5. ; 4 -0.1 ; 2.8680 -0.01 ; 2.7320 -0.001; 2.7196 0.001 ; 2.7169 0.01 ; 2.7048 0.1 ; 2.5937 0 5 ; 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to show it based on the table. Hope u can read ...
April 6, 2013

Physics
For this problem, you are allowed to consult with other members of the class, but not with faculty and not with anyone outside the course. Simplify all your expressions. A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not ...
April 6, 2013

math 114
A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
April 4, 2013

Algebra
A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
April 4, 2013

math 6 grade
b. 8 for $1.90
April 1, 2013

grade 12 life orientation
I NEEDS ANSWERS I AM CLUELESS
March 30, 2013

Chemistry
How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?
March 27, 2013

Spanish
Thank you MathMat, also is this the correct way to say, "hope to be back soon" in Spanish, "esperamos volver pronto"
March 19, 2013

Spanish
Hi there, how would I say the following phrase in Spanish: Mexico, it was beautiful. Next stop Italy.
March 19, 2013

Trig
Whats the height of a flagpole if a student stand 37feet from it and determines the angle of elevation to be 34degrees and her eyes are 5.3 feet from the ground(round to the nearest whole number)
March 11, 2013

Trig
the number of solutions of sin x= -sqrt3/2 for x between 0 and 2pi
March 11, 2013

Trig
the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.
March 11, 2013

Introduction to Business Environment Chapter 2
come on i have the answers, just wanted to check if i was correct
March 10, 2013

Introduction to Business Environment Chapter 2
The world's population is growing more slowly than expected, and there are some industrial countries in which growth might be so slow that there will be too many old people and too few young people to support them. (Points : 1) True False 2. In a free market system, price ...
March 10, 2013

Introduction to Business Environment
1. An entrepreneur is an individual who has worked for a nonprofit organization for his entire career. (Points : 1) True False 2. In analyzing factors of production that make a country "rich," it has been observed that some relatively poor countries often have plenty...
March 10, 2013

maths
Solve for m:E=mgh+1\2mu
March 9, 2013

algebra
arrange the terms in descending order (can any one give an example) 5-4x2+x3-6x
March 8, 2013

math
Thanks
March 8, 2013

math
Add the trinomials x + y - 2 and x - y + 4
March 8, 2013

math
can you give an example
March 8, 2013

math
arrange the terms in descending order. 5 - 4x2 + x3 - 6x
March 8, 2013

L0velyLayna
I'm in 8th all so can you reword it.
March 8, 2013

Chemistry
please help i really need the help
March 8, 2013

Chemistry
!00.0 grams of Na2SO4 reacts with 150.00 grams of Ba(NO3)2to form NaNO3 and BaSO4. How many grams of barium sulfate will form?
March 8, 2013

math ( polynomial )
How did you get the answer. For I can work it out.
March 8, 2013

math ( polynomial )
Identify each polynomial below as a monomial, bnomial, or trinomial and name the degree x2 - 25 x2 - 6x + 7 2x + 3y - 4
March 8, 2013

math
Thank you guys this really helps
March 8, 2013

math
sorry meant 8ft
March 8, 2013

math
tony cut 2 ft 7 1/2 in. length from 8 in long board. what is the remaining length of the board.
March 8, 2013

Geometry
Answer= (1,3)
February 28, 2013

Geometry
(1,3)
February 28, 2013

Algebra
oops, I made a mistake. There are 435 tiles!!!!
February 26, 2013

Algebra
The floor of a dance studio is covered with 615 tiles. The owner of the studio replaced the tiles last year. The tiles cost $15 for a set of 8 and $2 for each additional tile. What is the monthly increase the owner charged each of her 34 students over a 6-month period to cover...
February 26, 2013

Algebra
There are 435 tiles, not 615. Sorry.
February 26, 2013

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