Saturday
April 19, 2014

Posts by David


Total # Posts: 1,595

Geometry
Sorry, I meant to say perpendicular instead of parallel.

Geometry
Write an equation of the line that pass through point P and is parallel to the line with the given equation. P(3,5); y=4

Quantum Physics
seems you are doing a nice deal out here

Quantum Physics
jason what happened?

math
32

physics
A police car, whose siren has a natural frequency of 620Hz, moves away from a wall and towards a stationary observer at a speed of 30km/h. What is the beat frequency perceived by the observer? If the observer stands between the car and the wall, what beat frequency does he per...

Physics
The coefficient of static friction between the 2.90 kg crate and the 35.0° incline of Figure P4.41 is 0.260. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?

italian
se mangi troppi zuccheri puoi avere mal di denti.

geography (ms. sue)
why might workers be unwilling to take jobs in siberia?

physics
Car a with a mass of 1250kg is travelling at 30m/s to the east. Car b is a truck with a mass of 2000kg, travelling to the west at 25m/s. Assume these two vehicles experienc an inelastic collision but do not stick together and car a goes off 10m/s to the west what will be the r...

Geometry
Yes a is equal to b. Thanks for your help!

Geometry
But is 5a equal to 5b?

Geometry
Substitution Property of Equality: If a=20, then 5a= _____. The substitution rule states that If a=b then a can be substituted for b in any equation or expression. So I think that 5a=5b but the number answer is 100. Am I correct?

chemistry
Nope, just working in a study group. Each person asking a question. Thanks for the help. I thought about doing something like that but I was writing them with the noble gas first and that was making it difficult to see the pattern.

chemistry
Sort these elements into isoelectronic groups. Into three different boxes/sections. Elements: F- O2- Al3+ S2- Ti4+ K+ He Li+ B3+

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 .

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 .

chemistry
1138.3004?

chemistry
Yeah. What did you get?

chemistry
So the answer would be 1233.5 joules?

chemistry
How?

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 .

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

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

math
what is 1/3 of 1/2?

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

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?

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

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?;

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...

Math
(2/25 +13/25) - (2/5 - 14/15)

(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

(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

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 t...

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 produ...

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 pr...

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 p...

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 ...

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.

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

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?

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...

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 ...

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) Usi...

Accounting
A = 500000 b = 40

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?

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?

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.

Phyics Toughest question on earth
Dude Can`t Understand Please Help

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

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?

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

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

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 pre...

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 t...

CHEMISTRY
how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

CHEMISTRY
how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

Math
What is the barbell method

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.

Chemistry
Thank you !!

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

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

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

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??

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&...

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.

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

english
does the word "from" get capitalized in a title?

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 u...

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 ...

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 ...

Math
84-64cos(theta)

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 fr...

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

Math
THANK YOU !!!

HISTORY
What was the third force in Vietnam?

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 !

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

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.

Pre algabra
write 121 to 4 feet as a ratio in lowest terms

Life science, history, geography, and maths literacy
BEST THING EVER

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

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

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

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 t...

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 banke...

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?

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?

math 6 grade
b. 8 for $1.90

grade 12 life orientation
I NEEDS ANSWERS I AM CLUELESS

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

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

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

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)

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

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.

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

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 ...

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...

maths
Solve for m:E=mgh+1\2mu

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