Sunday

January 25, 2015

January 25, 2015

Total # Posts: 599

**Graph Theory/ Algorithms / Computer science**

Please delete this post! I have been able to figure it out. Thanks :)
*December 17, 2014*

**Graph Theory/ Algorithms / Computer science**

I am working on this problem from the book, Data Structures & Algorithm Analysis in C++. The problem is: 9.40 Give a polynomial-time algorithm that ﬁnds ceil(V /2) vertices that collectively cover at least three-fourths (3/4) of the edges in an arbitrary undirected ...
*December 17, 2014*

**chemistry**

It's ground state. So, yes it's D.
*December 15, 2014*

**Chemistry**

The heat of combustion of benzene, C6H6, is -41.74 kJ/g. Combustion of 3.65 of benzene causes a temperature rise of 4.41 C^o in a certain bomb calorimeter. What is the heat capacity of this bomb calorimeter? (kJ/C^o) So, I what I did was I multiplied -41.74 kJ/g and 3.65 to ...
*December 15, 2014*

**Science **

When magnesium oxide (MgO) and water (H20)react, they produce magnesium hydroxide Mg(OH)2. Magnesium hydroxide is a medicine used to treat an upset stomach. The equation for this chemical change is shown below: MgO + H20 --> Mg(OH)2 if 40.00 grams of magnesium oxide and 18....
*December 11, 2014*

**statistics**

1)According to past record the average daily sales for a sporting goods store was $3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample mean of 3655 with a standard deviation of $...
*December 6, 2014*

**math**

Thanks for the help
*December 1, 2014*

**math**

how do i divide the numerator by the denominator
*December 1, 2014*

**math**

thank you
*December 1, 2014*

**math**

how do i convert fractions to decimals and fractions to percents?
*December 1, 2014*

**two step equation-fraction**

I need step by step how to get the answer, I have been trying for hours, 4+m divided by 3 = 5/6 i have the answer just dont know the steps to get to the answer. m= -3/2 or 1 1/2
*November 29, 2014*

**two step equation-fraction**

The answer sheet I got says the answer is -3/2 or -1/1/2 Here is the equation again its 4 + 3 over 3 = 5/6
*November 29, 2014*

**two step equation-fraction**

the answer that i got on the answer sheet was 1/2 5.
*November 29, 2014*

**two step equation-fraction**

please show how you got the 2m
*November 29, 2014*

**two step equation-fraction**

please help me step by step thanks 4+m/3=5/6
*November 29, 2014*

**College Physics**

A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While balanced vertically, the ...
*November 23, 2014*

**Physics**

A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While balanced vertically, the ...
*November 23, 2014*

**helpppppppp**

Seven cats and 3 dogs weigh as much as 4 monkeys. One monkey weighs as much as 1 cat and 1 dog. How many cats weigh as much as 1 dog?
*November 7, 2014*

**Physics please help**

A cylindrical glass of water (H2O) has a radius of 3.49 cm and a height of 9.85 cm. The density of water is 1.00 g/cm3. How many moles of water are contained in the glass?
*October 27, 2014*

**Physics**

The atomic mass of a nitrogen atom (N) is 14.0 u, while that of an oxygen atom (O) is 16.0 u. Three diatomic gases have the same temperature: nitrogen (N2), oxygen (O2), and nitric oxide (NO). Rank these gases in ascending order (smallest first), according to the values of ...
*October 27, 2014*

**Physics**

The cylinder in the drawing contains 3.81 mol of an ideal gas. By moving the piston, the volume of the gas is reduced to one-fourth its initial value, while the temperature is held constant. How many moles Δn of the gas must be allowed to escape through the valve, so that...
*October 27, 2014*

**Physics**

You are pulling your little sister on her sled across an icy (frictionless) surface. When you exert a constant horizontal force of 120 N, the sled has an acceleration of 1.7 m/s2 If the sled has a mass of 8.4 kg, what is the mass of your little sister?
*October 13, 2014*

**Chemistry**

Silicon carbide, commonly known as carborundum, is a very hard and abrasive substance. The compound is prepared by heating silicon dioxide in the presence of graphitic carbon: SiO2(s) + 2C(s) --> SiC(s) + CO2(g) How many grams of silicon carbide can be formed from 20.0 g of...
*September 30, 2014*

**ratios**

as a fraction
*September 26, 2014*

**ratios **

1/4 to 1/3? 1/4:1/3
*September 26, 2014*

**question repost damon**

oh okay things 3/5 was a check,
*September 12, 2014*

**question repost damon**

Since some tutors dont check back, i want to repost this to damon: what percent more than 1/3 is 3/5? It said 3/5 was wrong, and I tried but i don't know what happend
*September 12, 2014*

**equations**

3/16 * N = 24? What does N equal please help!
*September 12, 2014*

**Mathematica**

It's wrong :(
*September 12, 2014*

**Mathematica**

what percent more than 1/3 is 3/5?
*September 12, 2014*

**Math**

Use substitution to solve the system. 3x+5y=21 y=2x-1
*August 27, 2014*

**statistics**

If a milk cow in California produced a mean of 1,875 pounds of milk per month, what percentage of production would that cow be in compared to the overall production per milk cow in California from 1990 through 2005?
*August 19, 2014*

**algebra**

Thanks Sheenybeany. It was: 71 - 35= 36.
*August 8, 2014*

**algebra**

Does anyone know how to find multiples of 7 from 250 to 500?
*August 8, 2014*

**MATH**

ok got it
*August 8, 2014*

**science**

what is a form of energy that is always transferred from a warmer substance to a cooler one?
*May 28, 2014*

**algebra**

A small painting has an area of 400 c m 2 . The length is 4 more than 2 times the width. Find the dimensions of the painting. Solve by completing the square. Round answers to the nearest tenth of a centimeter.
*May 20, 2014*

**science**

D. Scanning Electron Microscope
*May 7, 2014*

**Math**

I am very good at maths, I am estimated to get an A+, but I hate turning point questions. How do you find the turning point when given the quadratic function? f(x)=(x+3)^2 - 16 Write down the co-ordinates of the turning point on the grap of y=f(x)
*May 1, 2014*

**math**

what does sin2x/cos2x equal to?
*April 5, 2014*

**Physics please help ASAP!**

If you know the mass of a star and a planet’s radius and speed at perihelion (closest approach to the star), then using conservation of energy and angular momentum you can solve for the radius and speed of that planet at aphelion (farthest point from the star). Encke’...
*March 31, 2014*

**please help asap!**

A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter is 70 % of the way ...
*March 24, 2014*

**physics please help!!**

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. (A & B are 1 ...
*March 24, 2014*

**Physics**

Please help!
*March 24, 2014*

**Physics**

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. A and B are 1m ...
*March 24, 2014*

**math**

xy = 5 a) Identify each relationship as direct or inverse variation. b) Calculate the constant of each relationship and explain how you arrived at your answer. c) Using complete sentences, explain how the two relationships are different, and how they are similar.
*March 17, 2014*

**Calculus**

A ladder 25 feet long that was leaning against a vertical wall begins to slip. Its top slides down the wall while its bottom moves along the lever ground at a constant speed of 4 ft/sec. How fast is the top of the ladder moving when it is 20 feet above the ground?
*February 24, 2014*

**Science**

Classify reaction as addition, displacement, or decomposition: Al(s)+NaOH(aq)=Al(OH)3(s)+Na+(aq)
*February 16, 2014*

**Physics**

An 80 kg hiker climbs a 1000 m high hill at a constant speed. If the hiker's body is 25% efficient, how many kg of fat does the hiker burn in climbing the hill? Given: heat of reaction of body fat is 37000 kilo joules per kilogram. I know that change in potential energy is...
*February 15, 2014*

**Physics**

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 4.5 h, a swimmer makes exactly 69 laps in a swimming pool that is 35 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the ...
*January 19, 2014*

**Math**

Find an equation for the line that passes through the point (2, -5) and has slope -3
*January 17, 2014*

**math**

PLEASEEE HELPPP Evaluate exact values, if they exist? if any doesn't exist state so. a) (in randians) sin^-1(-1/√2)
*December 21, 2013*

**economics**

The demand curve for knobs is P=75-6QD and the supply curve for knobs is P=35+2QS. What is the equilibrium price of a knob?
*December 20, 2013*

**math**

whats the derivative of lnx?
*November 29, 2013*

**math**

show that the equation x^3-15x+c=0 has at most one root on the interval [-2,2.
*November 29, 2013*

**biology**

An individual with the genetic condition cystic fibrosis has CFTR protein with the amino acid histidine (at position 482), where the normal CFTR protein has arginine. (No other changes are observed in the protein.) This is the result of a _________ mutation. Select one: a. ...
*November 25, 2013*

**biology**

Which of the following is NOT true of transcription / translation processes in both bacteria and eukaryotes? Select one: a. RNA polymerase reads the template DNA strand to produce the complementary mRNA transcript. b. Translation of a polypeptide can occur before transcription...
*November 25, 2013*

**biology**

Gene expression regulation by methylation of the cytosines in a promoter would be considered : Select one: a. Transcriptional regulation. b. Posttranscriptional regulation. c. Posttranslational regulation. d. Translational regulation.
*November 25, 2013*

**chemistry**

how do u hybridize for sulfate (SO4 -2)?
*November 21, 2013*

**PHYICS**

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 470 N and have a center of gravity that is 1.13 m above the floor. His upper legs weigh 108 N and have a center of gravity that is 0.755 m above the floor. Finally, his lower legs and ...
*November 10, 2013*

**Phyics**

A 49-N crate is suspended from the left end of a plank. The plank weighs 21 N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a support that is 0.30 m from the left end of the plank. How far to the right of ...
*November 10, 2013*

**Phyics**

A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.710. Find the smallest value for the angle , such that the lower end of ...
*November 10, 2013*

**chemistry**

HELPPPP!!!! A mixture is prepared using equal masses of the two volatile liquids benzene, C6H6, and ethanol, C2H5OH. What is the mole fraction of benzene in this mixture?
*November 7, 2013*

**phyics**

A person who weighs 829 N steps onto a spring scale in the bathroom, and the spring compresses by 0.538 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses the spring by 0.390 cm?
*November 5, 2013*

**phyics**

The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.
*November 1, 2013*

**phyics**

The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.
*November 1, 2013*

**phyics**

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 470 N and have a center of gravity that is 1.13 m above the floor. His upper legs weigh 108 N and have a center of gravity that is 0.755 m above the floor. Finally, his lower legs and ...
*November 1, 2013*

**phyics**

One end of a meter stick is pinned to a table, so the stick can rotate freely in a plane parallel to the tabletop. Two forces, both parallel to the tabletop, are applied to the stick in such a way that the net torque is zero. The first force has a magnitude of 2.00 N and is ...
*November 1, 2013*

**phyics**

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 65 N·m. Using the data in the figure, determine the magnitude F of the force that you must exert on the wrench.
*November 1, 2013*

**phyics**

The steering wheel of a car has a radius of 0.19 m, and the steering wheel of a truck has a radius of 0.26 m. The same force is applied in the same direction to each steering wheel. What is the ratio of the torque produced by this force in the truck to the torque produced in ...
*November 1, 2013*

**Chemistry**

The protective action of ozone in the atmosphere comes through ozone's absorption of UV radiation in the 230 to 290 nm wavelength range. What is the energy, in kilojoules per mole, associated with radiation in the wavelength range?
*October 22, 2013*

**science**

Calculate the weight of a person with a mass of 67 kg that is holding a 12 kg box on earth
*October 10, 2013*

**math**

you just subtract the two.. it is telling you he drove x miles in one year then x miles is another.. what is the difference
*September 30, 2013*

**algebra**

a painter charged $320 to paint two walls taht measure 12 feet by 9ft and two walls that measured 10 ft by 9 ft. The client asks him to return to paint two walls that measue 15 ft by 12 ft and two walls that measure 18.5 feet by 12 ft. If the painter charges the same rate, ...
*September 30, 2013*

**algebra 1**

Tell whether the sequence is arithmetic. If the sequence is arithmetic, write a function rule to represent it. 12, –9, 6, –3, ...
*September 24, 2013*

**math**

one mile is 5280feet.justin has a stride of 32inches .how many steps will he take to run a 26 mile marathon?
*August 6, 2013*

**Physics**

Wait. Won't you have to use the equation yf=yi+viy+1/2ayt2?
*July 10, 2013*

**physics**

Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 69.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part (b)?
*June 30, 2013*

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.31 m/s. The car is a distance d away. The bear is 18.6 m behind the tourist and running at 8.01 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*June 28, 2013*

**physics**

The Space Shuttle travels at a speed of about 5.45 x 103 m/s. The blink of an astronaut's eye lasts about 111 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?
*June 28, 2013*

**math**

U guys need to stop putting i don't know and stuff bc it is affecting people who really need help
*May 14, 2013*

**eng**

what is a thesis?
*April 17, 2013*

**Chemistry**

What concentration of the salt NaC2H3O2 must be added to shift the equilibrium toward the reactants so that the [H3O+] concentration is reduced to pH = 5.4? Ka=1.8E-5
*April 16, 2013*

**Science**

Two parents have three children. They have two girls and one boy. What is the probability that the next child will be a boy?
*April 8, 2013*

**7th Grade Language Arts ~!!!!**

1. Sentence fluency can be achieved by _______________. (1 point) (1 pt) adding appropriate transitions (0 pts) using technical terms (0 pts) avoiding long quotations 1 /1 point 2. In order to establish the most appropriate voice in a research report, you should consider ...
*April 1, 2013*

**Science**

If one light bulb was removed in a circuit I think the others will go out because it is incomplete is this right? I will the remaining lights powered by a 9 volt be dim? I am not sure? I think go black dark because its incomplete.
*March 11, 2013*

**Science**

Thank you! I will read the link and study. Might have other questions maybe.
*March 11, 2013*

**Science**

I guess if all four switches were turned on.Would just just silver ? Why wouldn't yarn? I understand wood when it is wet that makes sense.
*March 11, 2013*

**Science**

Can wood, silver or yarn light up a light bulb? I think wood can carry a current.
*March 11, 2013*

**history**

How did Enlightenment thinkers attempt to apply the techniques of the Scientific Revolution to human political and social organizations?
*March 6, 2013*

**physical**

Sanchez Mr Potato? Q
*February 26, 2013*

**science**

web physiology? lol due tmrw?
*February 25, 2013*

**math question**

thank you
*February 21, 2013*

**math question**

Why is 6/8 not equivalent to 18/32 ??
*February 21, 2013*

**physics**

heading due north at 6.00 m/s relative to the water. The local ocean current is 1.53 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
*January 31, 2013*

**physics**

a 40 kg high jumper leaves the ground with a speed of 6m/s. how high can he jump ?
*January 20, 2013*

**physics**

a 65 kg student, starting from rest , slides down an 8 meter high water slide. how fast is he going at the bottom of the slide ?
*January 20, 2013*

**health**

Oh my bad i meant D!
*January 16, 2013*

**health**

To keep a positive attitude on the job, you should A. look for the perfect company—this will ensure everything will be all right. B. complain about the things that bother you so they can get straightened out. C. encourage others to help you with your work. D. look for ...
*January 16, 2013*

**music**

Einstein on a Beach was a unique opera because it A. had a single violinist. B. was exclusively recitative. C. was written in Chinese. D. had no plot and very little singing. Is it C?
*January 15, 2013*

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