Saturday
December 20, 2014

Posts by BOBBY


Total # Posts: 600

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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