Homework Help: Computers: Operating Systems

Recent Homework Questions About Operating Systems

Medical Coding 1
Please help me with these questions to see if I'm right or close 1. Which of the following ICD-9-CM code groups is used to report the infant status after delivery of a birth event? A. V27.0–V27.9 B. V26.0–V26.9 C. V29.0–V29.9 D. V28.0–V28.9 I thought it...
Friday, April 27, 2012 at 11:38am

chemistry
When setting up an electroplating system, how do you set up the terminals of the voltage source to the anode and cathode? Does oxidation or reduction happen at the cathode? What does this require? Based on your answer, to which terminal of the battery would you attach the ...
Friday, April 27, 2012 at 10:22am

chemistry
am in need of help with my final project in Geology. I have to create a 12-15slide powerpoint presentation on Factors and Forces of Geological Features, The Barnett Shale. I have the final rubric Final Rubric: |Factors and Forces of Geological Features Objective of Exercise...
Friday, April 27, 2012 at 6:14am

chemistry
What does a catalyst do to the rate of reaction? What would you expect to happen to the rate of decomposition of dinitrogen pentoxide if a catalyst were added to the system?
Thursday, April 26, 2012 at 5:15pm

Chemistry
The Kp for the following equilibrium system is 4.31 x 10‒4 at 375°C : N2(g) + 3H2(g) ↔ 2NH3(g). If 0.862 atm of N2 and 0.373 atm of H2 were mixed in a constant-volume flask and heated to 375°C, which of the following would be closest to the equilibrium ...
Thursday, April 26, 2012 at 3:44pm

Physics- springs
Block A has a mass 1.00kg, and block B has a mass 3.00 kg. the blocks are forced together, compressing a spring S between them; then the system is released from rest on a level, frictionless surface. The spring which egligible mass, is not fastened to either block and drops to...
Wednesday, April 25, 2012 at 11:54pm

ALGEBRA
Solve the system. $ \left\{ \begin{tabular}{l} $ y = x + {\color{red}-3} $ \\ $ y = -{\color{red}2} x + {\color{red}9} $ \end{tabular} \right. $ x = y =
Wednesday, April 25, 2012 at 8:45pm

mathhhhh
For a person of height h (in inches), a healthy weight W (in pounds) is one that satisfies this system of inequalities: W is greater than or equal to (19h^2)/703 and W is less than or equal to (25h^2)/703 Graph the system for 0 is less than or equal to h which is less than or ...
Wednesday, April 25, 2012 at 7:44pm

Operations Management 10th edition
The three station work cell illustrated in Figure S7.7, has a product that must go through one of the two machines at station 1 (they are parallel) before proceeding to station 2. Station 1-Machine A-Capacity: 20 units/hr Station 2-Capacity: 5 units/ Station 3-Capacity: 12 ...
Wednesday, April 25, 2012 at 5:34pm

Human Biology
Starting with the right ventricle of the heart, describe the function of the heart and the movement of the blood through the pulmonary and systemic circuit. Include a description of gas exchange within the lungs. Now consider what happens if Jake starts smoking. Discuss in ...
Wednesday, April 25, 2012 at 3:41am

Physics. PLEASE HELP!!
Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic energy of the ...
Wednesday, April 25, 2012 at 12:18am

algebra
The Creekside Theater is putting on a p lay. The Hanson family bought five adult tickets and two child ticke ts for $129.00. The Rivera family bought two adult tickets and six child tickets for $107.50. Write a system of equations to represent this situation
Tuesday, April 24, 2012 at 7:06pm

English
Can you please help express the concept below? Thank you, Writeacher. I was last proud of myself when I got an A in maths/when I got a 7 and a half (according to the Italian grade system) in maths.
Tuesday, April 24, 2012 at 6:42pm

Physics
A 2.20 kg mass attached to a spring oscillates with a period of 0.440 s and an amplitude of 16.5 cm. (a) Find the total mechanical energy of the system (b) Find the maximum speed of the mass
Tuesday, April 24, 2012 at 4:07pm

Physics
A 1.55 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 16.5 cm. (a) Find the total mechanical energy of the system. (b) Find the maximum speed of the mass.
Tuesday, April 24, 2012 at 12:27pm

chemistry
In the carbonic acid equilibrium system, what happened to the size of the size of the balloon upon addition of more acid (HCl) and also what happened to the balloon upon addition of NaOH, was this expected? why or why not. ( show answers using equilibrium equation.
Tuesday, April 24, 2012 at 11:59am

Sociology- Help Is Needed Please
Hi, I'm totally lost with this assignment and don't know where to start at with this assignment. I know I'm in Group B will argue against the use of culture as a defense. Can someone please give me advice on how to do this assignment any help will be appreciate. ...
Monday, April 23, 2012 at 9:11pm

chemistry(please check)
Just made it a new post didnt what it to get overcrowning.I hope this will help us figure out now For questions #1 through #10, refer to the following equilibrium system, with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O(aq)----> C7H16O2 (aq) + 2H2O (l) 1. What is the equilibrium ...
Monday, April 23, 2012 at 4:28pm

Chemistry
What is true about a system in chemical equilibrium? No reactants remain in the system. There are no products in the system. The amount of product equals the amount of reactant. The amount of reactant changes, but over time remains about the same.
Monday, April 23, 2012 at 2:30pm

physics
A cylindrical brass container with a base of 80.0 cm^2 and height of 20.0 cm is filled to the brim with water when the system is at 25.0° C. How much water overflows when the temperature of the water and the container is raised to 96.1° C? (The coefficient of volume ...
Monday, April 23, 2012 at 2:14pm

Chemistry(Please check answers)
1) For a reaction delta Go is more negative than delta Ho. What does this mean? a. delta So is zero. b. delta So is negative c. delta So is positive d. delta So is negative if delta Ho is positive. e. delta So is negative if delta Ho is negative. I think that delta S is ...
Monday, April 23, 2012 at 1:29pm

Physics
A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...
Monday, April 23, 2012 at 1:14pm

Physics
A 1.55 kg mass attached to a spring oscillates with a period of 0.375 s and an amplitude of 16.5 cm. Find the total mechanical energy of the system Find the maximum speed of the mass
Monday, April 23, 2012 at 10:57am

physics
A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...
Monday, April 23, 2012 at 9:55am

chemistry
following equilibrium system with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O (aq)--> C7H16O2 (aq) + 2H2O (l) pleas check to see I answer these correclty.. 1.Is this an endothermic- or exothermic reaction, as written?answer: Exothermic 2.How would the equilibrium shift if the ...
Monday, April 23, 2012 at 8:22am

Thermodynamics
A heat pump works on the vapor compression refrigeration cycle with 0.2 kg/s of refrigerant-134a as the working fluid. The cycle is used to keep a house at 26oC while absorbing heat from the outside at 3oC. R-134a enters the compressor at 200 kPa as a saturated vapor and ...
Monday, April 23, 2012 at 5:23am

Health
Jennifer is fifty-four. Her husband Brian died suddenly in a care crash. Not only was she emotionally distraught, but she found herself in serious financial turmoil. Brian had handled the finances (at least she had thought he had) throughout their 21 year marriage. Upon his ...
Sunday, April 22, 2012 at 11:51pm

chemistry
following equilibrium system with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O (aq)--> C7H16O2 (aq) + 2H2O (l) 1.What is the equilibrium expression for this system? 2.If the molar concentrations of C3H6O2 and C2H6O are both 0.255 at equilibrium, what is the equilibrium ...
Sunday, April 22, 2012 at 11:45pm

Science 7R - Worksheet
Title of the worksheet - What is the structure and function of our skeletal system? B. Identify three bones that protect internal organs ******** There is this chart on the left it says "bone" and on the right it says "Internal Organ Protected" (there are 3...
Sunday, April 22, 2012 at 2:48pm

Please Proofread Any Suggestions Will Help
Every morning, I drive to work; as I get closer I can hear the cadence calling of all the basic training units on Fort Benning, Georgia. Regardless of what is on the training schedule for the rest of the day, we conduct Army Physical Readiness Training (APRT). At a minimum the...
Sunday, April 22, 2012 at 1:44pm

math
a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force, find an expression ...
Sunday, April 22, 2012 at 3:45am

computer network engineering
a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force, find an expression ...
Sunday, April 22, 2012 at 3:44am

Inequalities
graph the system of inequalities: ( x-3)^2/9 + (y+2)^2/4<=1 and (x-3)^2+(y+2)^2>=4 I do not know how to simplify this down enough to graph it
Saturday, April 21, 2012 at 3:26pm

Accounting
1. Partially Correct Check My Work Problem-Solving Strategy Problem 16-1 (Algorithmic) Statement of Cash Flows—Indirect Method The comparative balance sheet of Mavenir Technologies Inc. for December 31, 2013 and 2012, is shown as follows: Dec. 31, 2013 Dec. 31, 2012 ...
Saturday, April 21, 2012 at 2:45pm

English Essay:NCLB
can some proofread my paragraph it is for a persuasive essay? Please,Thank You!! Is Education system taking the risk for students learning? Is the capital that we have been giving helping students to improve their performance in schools ? What can be done to futher advance ...
Saturday, April 21, 2012 at 12:16pm

MATH
Solve system of equations algebraically. 1. 3x-3y=24 and 2x+5y=-37 2. -9x+10y=-2 and 45x-50y=11 3. -9x-3y=-3 and 18x+6y=6 4. -5x-6y=-23 and 8x+7y=29 5. 9x-7y=4 and 5x+3y=-46
Friday, April 20, 2012 at 9:54pm

algebra
theperimeter of a rectangle is32 ft. The lenght is 12 ft longer than the width. Find the dimensions. Write a system of linear equations and solve the resulting system. Let x be the lenght and y be the width write the first equation 2x-2y= write the second equation x=y+ what is...
Friday, April 20, 2012 at 4:50pm

physics
a 2kg and a 4kg hang freely at opposite end of a light in-extensible string which passes over a small and light pulley fixed to a rigid support.calculate the acceleration of the system.
Friday, April 20, 2012 at 7:40am

physics
A piece of metal at 80 degrees celsius is placed in 1.2 L of water at 72 degrees celsius. The system is thermally isolated and reaches a final temperature of 75 degrees celsius. Estimate the approximate change in entrophy for this process.
Thursday, April 19, 2012 at 9:58am

physics
The coefficient of friction between the block of mass m1 = 3.00 kg and the surface in the figure below is ìk = 0.365. The system starts from rest. What is the speed of the ball of mass m2 = 5.00 kg when it has fallen a distance h = 1.90 m?
Thursday, April 19, 2012 at 6:46am

physics
Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
Wednesday, April 18, 2012 at 7:45pm

physics
The shock absorbers in the suspension system of a car are in such bad shape that they have no effect on the behavior of the springs attached to the axles. Each of the identical springs attached to the front axle supports 351 kg. A person pushes down on the middle of the front ...
Wednesday, April 18, 2012 at 3:28pm

Physics
Two masses, m1=3kg and m2=2kg, are suspended with a massless rope over a pulley of mass M = 10kg. The pulley turns without friction and may be modeled as a uniform disk of radius R=.1m. You may neglect the size of the masses. The rope does not slip on the pulley. The system ...
Wednesday, April 18, 2012 at 10:15am

BA345 Patents, Copyrights, Trademrks
The day after the internet went on strike, the Justice Department indicted 7 individuals and two companies who were a part of Megaupload.c--. Research MegaUpload.c-- and the copyright infringement charges. Do you think MegaUpload is guilty of copyright infringement? Why or Why...
Tuesday, April 17, 2012 at 8:44pm

PLEASE CHECK
1.)Solve for y in the following system of equations. x + 4y = -38 -x - 6y = 58 My answer 1.) -10 2.) 6 3.) 12 4.) 10 2.)Solve for y in the following system of equations. x - 10y = -50 -4x + 6y = -4 1.) -6 2.)3 3.)-3 My answer4.)6
Tuesday, April 17, 2012 at 2:15pm

biology
Orange juice is often touted by nutritionists as being an excellent antioxidant. Within an essay response, discuss the following concepts: an antioxidant’s function, free radicals and their effect on the human body, sources of vitamin C, optimal delivery system for ...
Tuesday, April 17, 2012 at 2:07pm

Reading/English
Question 1 of 20 5.0 Points Critical Reading Identify the letter of the choice that best completes the statement or answers the question. What is Mr. Gradgrind’s opinion of horse riders? A. He does not approve of them. *B. He is fascinated with them. C. He believes they ...
Tuesday, April 17, 2012 at 1:59pm

physics
Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
Tuesday, April 17, 2012 at 1:38pm

Algebra 1B--check
Solve for y in the following system of equations. x + 4y = -38 -x - 6y = 58 My answer 1.) -10 2.) 6 3.) 12 4.) 10
Tuesday, April 17, 2012 at 1:08pm

physics
Water is circulating through a closed system of pipes in a two- floor apartment. On the first floor, the water has a gauge pressure of 3.4*10^5 Pa and a speed of 2.1 m/s. However, on the second floor, which is 4.0 m higher, the speed of the water is 3.7 m/s. The speeds are ...
Tuesday, April 17, 2012 at 12:28pm

Physics
In cold climates, including the northern United States, a house can be built with very large windows facing south to take advantage of solar heating. Sunlight shining in during the daytime is absorbed by the floor, interior walls, and objects in the room, raising their ...
Tuesday, April 17, 2012 at 10:09am

English 12
Question 1 of 20 5.0 Points Critical Reading Identify the letter of the choice that best completes the statement or answers the question. What is Mr. Gradgrind’s opinion of horse riders? A. He does not approve of them. B. He is fascinated with them. C. He believes they ...
Tuesday, April 17, 2012 at 9:33am

Biology
GENETICS PRACTICE PROBLEMS Worth 10 points each problem is either right or wrong 1. In humans, assume that brown eyes (B) are dominant over blue eyes (b). A blue eyed man, both of whose parents were brown eyed, marries a brown eyed woman whose father was brown eyed and whose ...
Monday, April 16, 2012 at 10:23pm

Physics
A car of mass 1.25 103 kg is initially moving on a level road at a speed of 17.0 m/s. Compute the increase in temperature of the brakes, assuming that all the mechanical energy ends up as internal energy in the brake system. Assume a total heat capacity of 10,000 J/C°.
Monday, April 16, 2012 at 4:29pm

Health Science
Implementation of informatics has shown to be effective in many areas of health care. Perform a brief literature review and discuss one area that has shown significant savings in the operating budget.
Monday, April 16, 2012 at 1:54pm

physics
A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller. When heat is added to a system, the temperature must rise. When the pendulum of a grandfather clock is heated, the clock runs more slowly. Cold objects do not radiate heat energy. ...
Monday, April 16, 2012 at 10:42am

physics
A metal container, which has a mass of 9.4 kg contains 14.2 kg of water. A 1.7-kg piece of the same metal, initially at a temperature of 160.0°C, is dropped into the water. The container and the water initially have a temperature of 15.0°C and the final temperature of ...
Monday, April 16, 2012 at 10:40am

science
what is buffer (ing) solution and its application with one example? and buffer system in blood?
Monday, April 16, 2012 at 9:35am

thermodynamics
0.5 kg of saturated vapor is contained in a closed system with pressure of 10 bar is cooled at constant volume until pressure decreases to 5 bar. Determine heat transfer and sketch the process in a P-v and T-v diagram answer = -473.35 kJ(heat is transferred from system to ...
Monday, April 16, 2012 at 9:33am

Transportation and Cargo Security
THIS IS THE FULL QUESTION I AM ASKED TO DO. Identify an asset such as an airport or a shipping company within the global transportation system. Develop and describe a security system that you feel would be most appropriate to protect the assets of the organization selected by ...
Sunday, April 15, 2012 at 8:40pm

Transportation and Cargo Secuirty
Identify an asset such as an airport or a shipping company within the global transportation system. What does this mean? What is an asset of an airport or shipping company?
Sunday, April 15, 2012 at 8:08pm

transportation and cargo security
Research the various U.S. transportation systems and identify the appropriate one to use for your case study. Research the selected system carefully and prepare a brief summary. The summary should include the following: An introduction to the system. Public utilization of the ...
Sunday, April 15, 2012 at 7:53pm

Statistics help please!!!
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
Sunday, April 15, 2012 at 7:33pm

Math 7 - HW Question Check (Q3)
Kevin designs sprinkler system for his yard. One rotation of the sprinkler waters a circle with an area of 225(pi) square feet. What is the radius, r, of the circle the rotating sprinkler waters? a) 15 ft b) 25 ft c) 30 ft d) 47 ft Answer - A Why?: A = (pi) x r(2 to the second...
Sunday, April 15, 2012 at 6:52pm

Int algebra
Convert the system of equations into a matrix equation. x+4y-z=7 x+y+z=2 -2x-2y+2z=-8
Sunday, April 15, 2012 at 6:08pm

Statistics
The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
Sunday, April 15, 2012 at 6:03pm

physics
A room has a volume of 164 m3. An air-conditioning system is to replace the air in this room every 26.8 minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompressible fluid, find the length of a side of the square if the air speed ...
Sunday, April 15, 2012 at 8:20am

chemistry
We had a Chemistry lab for buffer system, we used HCl and NAOH. We did a graph ( PH vs ml of HCL and NaOH, we told to estimate the buffer capacity using the graph. How to do this?
Saturday, April 14, 2012 at 11:07am

poli sci 150
One important cause of the United States' two-party system is a) single-member electoral districts b) proportional representaion c) the Constitution's requirement for bipartisanship in Congress d) internal mobilization e) multimember electioral districts
Friday, April 13, 2012 at 10:05pm

physics
An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the efficiency of the engine?
Friday, April 13, 2012 at 9:24am

algebra
Delila has $1200 in a saving account and in a checking account. The ratio of money in saving to money in the checking is 3 to 2. Use a system of equation to find how much money is in each account .
Thursday, April 12, 2012 at 9:18pm

Programming Logic
Shemrock Inc. is a brake pad manufacturing company. This company uses raw materials, such as carbon powder, iron, ash, and resin. It wants to develop an inventory management system that will have the following features: 1.The system should store the current inventory levels ...
Thursday, April 12, 2012 at 6:40pm

6th grade geo
in which area would you find coal veins? in contrast to the southern uplands and the highlands, the central lowlands of Scotland which of the following is an accurate statement about the way that the welsh economy has changed in the late twentieth century Scotland’s lakes...
Thursday, April 12, 2012 at 4:20pm

criminal justice
What is the technological and management system that aims to make the police better organized and more effective crime fighters?
Thursday, April 12, 2012 at 11:35am

physics
The device called an At-woods machine.if m2 is greatr than m1 an assumng th pulley to be frictionless and massless.1.how far will m2 fall in th time T aftr the system is released? 2.what is th tension in the cord that connect two massess? 3. If m1=5kg and m2=3kg,what is the ...
Thursday, April 12, 2012 at 6:03am

physics
A space vehicle is coasting at a constant velocity of 20.5 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.270 m/s2 in the +x direction. After 48.0 s, the pilot ...
Thursday, April 12, 2012 at 12:06am

Chem Lab
Can the NH3/NH4Cl system be sued to prepare a buffer of a pH 9.5? why or why not? Can it prepare a buffer of pH 5? There were two buffers, 0.2 M and 0.1M.
Wednesday, April 11, 2012 at 11:21pm

physics
How do you know that a sealed calorimeter is a closed system? because temperature is consurved because the masses of the sample and water are equal because thermal energy is not transferred to the environment because work is done on the test sample Please help me
Wednesday, April 11, 2012 at 9:15pm

English
i writing a process analysis essay on topic staying healthy in winter and i making it a directional type of process analysis essay because it be easy to direct people on how to do things. the only points i get for staying healthy in winter be wearing warm clothing, covering ...
Wednesday, April 11, 2012 at 8:24pm

Physics. PLEASE HELP!!
A ball bounces to 45 percent of its original height. What fraction of its mechanical energy is lost each time it bounces? What is the coefficient of restitution of the ball-floor system?
Wednesday, April 11, 2012 at 6:43pm

Accounting
Identify whether each description best applies to a periodic or a perpetual inventory system. a. Provides more timely information to managers. b. Requires an adjusting entry to record inventory shrinkage. c. Markedly increased in frequency and popularity in business within the...
Wednesday, April 11, 2012 at 3:20pm

physics
Consider 3 liters of an ideal (monatomic) gas at a pressure of 34 atm and a temperature of 356K. Call this state of the system A. Using the ideal gas law, calculate the number of moles of gas present in the system. 3.49 The temperature of the system is reduced, keeping the ...
Wednesday, April 11, 2012 at 1:51pm

College physics
A 0.006 00-kg bullet traveling horizontally with a speed of 1.00 x 10^3 m/s enters an 20.1-kg door, imbedding itself 10.9 cm from the side opposite the hinges as in the figure below. The 1.00-m wide door is free to swing on its frictionless hinges. At what angular speed does ...
Wednesday, April 11, 2012 at 1:40pm

physics
two perfect elastic balls of same mass m are moving with velocities u1 and u2 . they collide elastically n times. the kinetic energy of the system finally is?
Wednesday, April 11, 2012 at 9:08am

Chemistry
Which of the following is the most effective buffer system for a pH value of 7.45? Assume all are 1M A. Carbonic acid and sodium bicarbonate B. Sodium bicarbonate and sodium carbonate C. Sodium dihydrogen phosphate and disodium hydrogen phosphate D Hydrogen cyanide and sodium ...
Wednesday, April 11, 2012 at 8:09am

math-inequalities
graph solution set of system of inequalities x+y< 4 x-2y>6
Wednesday, April 11, 2012 at 2:14am

physics
A 40-g block of ice is cooled to −71°C and is then added to 590 g of water in an 80-g copper calorimeter at a temperature of 27°C. Determine the final temperature of the system consisting of the ice, water, and calorimeter. (If not all the ice melts, determine ...
Wednesday, April 11, 2012 at 2:05am

Computer Science
I am making a object oriented program and hashing the list of make of an electronic and type to the JCombobox...i am getting this number Exception error...it will nice if you could tell why am i getting it eventhough i am doing the casting and everything. Try to help ASAP! ...
Tuesday, April 10, 2012 at 9:59pm

physics
The system in the Figure is in equilibrium. A mass M1 = 242.0 kg hangs from the end of a uniform strut which is held at an angle theta = 41.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 27.0o with respect to the horizontal. The strut has...
Tuesday, April 10, 2012 at 8:57pm

calculus test corrections. 1 question
Find the minimum value of f(x, y) = y – x + 1 for the polygonal convex set determined by this system of inequalities. x > 0 y > 0 2x + y< 4 the answer is -1. please tell me why
Tuesday, April 10, 2012 at 7:48pm

Pre-calculus
Find the minimum value of f(x, y) = y – x + 1 for the polygonal convex set determined by this system of inequalities. x > 0 y > 0 2x + y< 4 the answer is -1. please tell me why
Tuesday, April 10, 2012 at 2:12pm

calculus test corrections. 1 question
Describe the linear programming situation for this system of inequalities. x < 1 y > 0 3x + y < 5 the answer is unbounded. please tell me why
Tuesday, April 10, 2012 at 2:10pm

physics
The source of all wave motion is ____________________. A) something vibrating.B) a harmonic object, or system of objects.C) any energy source.D) a region of high and low pressures.E) transverse motion.
Tuesday, April 10, 2012 at 12:55pm

Chemistry
You have 250mL of a 0.56M solution of sodium acetate. How many mL of 0.50M acetic acid should be added to make a buffer of pH 4.40? I think this is a buffer system so I would use pH=pka + log base/acid so would I set this up as 4.40 = 4.74 + log base/ 1.8e-5 from acetic acid?
Tuesday, April 10, 2012 at 10:43am

Biochemistry
In the electron transport chain, electrons from FADH2 are eventually used to reduce O2 into H2O. Experimentally, the proton motive force created by this process will generate 2 ATP molecules from ADP and Pi, using ATP synthase. From the information provided below, calculate ...
Tuesday, April 10, 2012 at 2:13am

chem-entropy
a glassblower heats glass (the system) to its softening temperature. Is the entrophy change of the system is positive or negative?
Monday, April 9, 2012 at 7:20pm

science
a 150g of a metal at 80degree C is placed in 100cm3 of pure water at 20degree C. the final temperature of the system (metal+water) is 23degree C. what is the specific heat of the metal? i got the ans -0.16 by using formula mCdelta T(water)=mCdeltaT(metal) but i am not sure if ...
Monday, April 9, 2012 at 4:20pm

Chemistry(Please check answers)
1)What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0e-15 Pb(OH)2 4.0e-15 = (x)(2x)^2 = 4x^3 I divided by 4 and took the cube root and got 1.12e-5 but I am not sure I took the cube root correctly. -log(1.12e-5)= 4.95 14-4.95 = 9.05 The answer choices ...
Monday, April 9, 2012 at 4:12pm

physics
A horizontal water main with a cross-sectional area of 206 cm2 necks down to a pipe of area 42.4 cm2. Meters mounted in the flow on each side of the transition coupling show a change in gauge pressure of 71.0 kPa. Determine the flow rate through the system, taking the fluid to...
Monday, April 9, 2012 at 2:22pm

chemistry
Write an equilibrium reaction for a buffer system made of the weak base, B, and its conjugate acid. If the buffer contains 1.05 M of B and 0.750M conjugate acid and has a pH of 9.50, what is the pH after 0.0050 mol HCl is added to 0.500 L of this solution?
Monday, April 9, 2012 at 11:35am

English
Writeacher, I hope you can help me clarify the following sentences. I can't understand the relation between the knights and the barons. 1) Henry II was successful in bringing 3)order and stability. To avoid civil wars, he needed to reduce the power of the barons and wanted...
Monday, April 9, 2012 at 5:31am

Physics (12th Grade)
In changing the state of a system from state A to state B adiabatically the work done on the system is 322 J. If 100 cal f heat are given to the system in bringing it from state A to state B, then what will be the work done on the system in this process?
Monday, April 9, 2012 at 12:41am

Physics (12th Grade)
In a certain process 500 cal of heat is given to a system and the system does 100J of work. What will be the increase in internal energy of the system?
Monday, April 9, 2012 at 12:27am

Chemistry
N2 (g) + H2 (g) <--> NH3 (g) + energy Name the direction of equilibrium shift - The pressure of the system is increased. - H2 is added to the system. - The temperature of the system is decreased.
Sunday, April 8, 2012 at 11:54pm

Statistics
You are responsible for quickly fixing your company¡¯s computer system when it crashes. You know that there are three possible sources of errors in the system: the disk drive, the memory and the operating system. From an analysis of historical data, you find that 50...
Sunday, April 8, 2012 at 11:04pm

ALGEBRA
Solve the system. $ \left\{ \begin{tabular}{l} $ y = x + {\color{red}-2} $ \\ $ y = -{\color{red}3} x + {\color{red}10} $ \end{tabular} \right. $
Sunday, April 8, 2012 at 7:15pm

College Physics
A 40 kg child is standing on the edge of a merry-go-round in a playground. Before they were deemed too dangerous, these were quite common. They were just huge rotating platforms you could sit on while someone spun you around in uniform circular motion until you screamed in ...
Sunday, April 8, 2012 at 6:23pm

science
A ball of mass m is attached by two strings to a vertical rod. as shown above. The entire system rotates at constant angular velocity about the axis of the rod. a)Assuming is large enough to keep both strings taut, find the force each string exerts on the ball in terms of , m...
Sunday, April 8, 2012 at 2:53pm

Pre-calculus
Find the value for c for which the system is consistent and dependent. 3x + y = 5 4.5y = c + 9x Find the minimum value of f(x, y) = y – x + 1 for the polygonal convex set determined by this system of inequalities. x > 0 y > 0 2x + y< 4
Sunday, April 8, 2012 at 12:50pm

Pre-calculus
1)Which term best describes the linear programming situation represented by x+y=2 why is the answer infeasible? 2)Describe the linear programming situation for this system of inequalities. x < 1 y > 0 3x + y < 5 why is the answer unbounded?
Sunday, April 8, 2012 at 12:42pm

Calculus
The seesaw principle: As you probably know, any two persons can balance each other when sitting on opposite sides of a seesaw, regardless of their weights. It is only necessary that each person contribute the same moment â€” calculated by multiplying the person...
Sunday, April 8, 2012 at 9:08am

Physical Science
I need some help. I have tried working this problem and can't get it. A scale model of the solar system is being constructed where 40cm of the model represents 0.5 AU of actual distance. What is the model dimension, in meters, for the distance of Jupiter from the sun?
Sunday, April 8, 2012 at 2:22am

math
solve the system of linear equations 2x+2y=1 3x-y=6 thanks
Saturday, April 7, 2012 at 9:02pm

calculus
1)Which term best describes the linear programming situation represented by x+y=2 why is the answer infeasible? 2)Describe the linear programming situation for this system of inequalities. x < 1 y > 0 3x + y < 5 why is the answer unbounded?
Friday, April 6, 2012 at 8:26pm

Chemistry
Sulfur trioxide gas, one of the causes of acid rain, is produced in the upper atmosphere when oxygen reacts with sulfur dioxide gas in the reaction shown below: 2SO2(g) + O2(g) <--> 2SO3(g) deltaH0 = -197kJ The gases are placed in a reaction vessel and allowed to come to...
Friday, April 6, 2012 at 1:31pm

Physics
A proton is located at a distance of 0.430 m from a point charge of +8.30 µC. The repulsive electric force moves the proton until it is at a distance of 1.55 m from the charge. Suppose that the electric potential energy lost by the system is carried off by a photon that ...
Friday, April 6, 2012 at 11:14am

bookkeeping
what is the accounting system where you record revenue when the business earns it,and expenses at the time the business incurs them? (a)cash (b)GAAP (c)accrual (d)COGS my answer is c what is the time period called from the time the business opens to the last day of the twelfth...
Friday, April 6, 2012 at 10:35am

bookkeeping
a store purchased 500 in merchandise on account.using the periodic inventry system,how would you record your entry? (a)debit merchandise inventory 500 and credit accounts payable 500 (b)credit purchase 500 and debit accounts payable 500 (c)credit merchandise inventory 500 and ...
Friday, April 6, 2012 at 10:30am

biology
1.Describe the pathway of an unfertilized egg as it travels through the female reproductive system
Friday, April 6, 2012 at 9:36am

Physics
A mass of 1.0 kg is located at the end of a very light and rigid rod 44 cm in length. The rod is rotating about an axis at its opposite end with a rotational velocity of 3 rad/s. (a) What is the rotational inertia of the system? kg · m2 (b) What is the angular momentum ...
Friday, April 6, 2012 at 1:10am

Analyzing Financial Statements
EAT AT MY RESTAURANT-CASH FLOW With this case, we review the cash flow of several restaurant companies. The restaurant companies reviewed and the year-end dates are as follows: 1. Yum Brands, Inc. (December 30, 2008; December 30, 2007) "Through the five concepts ofKFC, ...
Thursday, April 5, 2012 at 3:32pm

math
how many solutions exist for the following system 3x-6y=12 and 2x-4y=7
Thursday, April 5, 2012 at 11:19am

chem
What mass of ice at 0°C can be melted by the addition of 1670 joules of heat? When the temperature is decreased on the following system at equilibrium: 2 HCl(aq) + Mg(s) <--> MgCl2(aq) + H2(g) + heat a. In order to restore equilibrium, the reaction shifts left, ...
Thursday, April 5, 2012 at 12:22am

Human resources
Role Play In this mock executive team meeting, you will assume the role and responsibility for a specific function (for example, human resources, marketing, finance, legal, and operations). The team will be given a scenario in which strategic decisions are to be made for rapid...
Wednesday, April 4, 2012 at 8:51pm

Intermediate Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 14x + 18y = -54,-4x – 14y = 42
Wednesday, April 4, 2012 at 7:49pm

Government
The hacienda system in latin america most closely resembled? A. communist states B. fuedal systems C. modern parliaments D. direct democracies Is it B?
Tuesday, April 3, 2012 at 8:49pm

finite math
Determine whether each system of linear equations has a)one and only one solution, b)infinitely many solutions, or c) no solution 2x-4y=5 3x +2y=6
Tuesday, April 3, 2012 at 6:29pm

chemistry
Consider the reaction at equilibrium: 2NO2(g) <---> N2O2(g) + O2(g) for which, H = −20.4 kJ · mol−1. If you decrease the temperature of the system, what will occur?
Tuesday, April 3, 2012 at 6:06pm

Economics
Does this thesis on a solution for welfare sound good?: "For the betterment of Canada, the welfare system needs to undergo a serious change in the rules for applying to welfare." I plan on listing each problem (one subtopic each) of welfare and than the solution and ...
Tuesday, April 3, 2012 at 5:58pm

chemistry
Consider the combustion of glucose: C6H12O6(s) + 6O2(g) <---> 6CO2(g) + 6H2O(g) H = −3 kJ/mol Which condition I) Adding more carbon dioxide; II) Performing the reaction in a hotter environment; III) Decreasing the pressure of the system; IV) Adding a reagent that ...
Tuesday, April 3, 2012 at 5:43pm

math
Find the solution of the given system by the method of addition that was used in Examples 4 and 5. If there is no solution or infinitely many solutions, state so. Put the value for x in the blank. 2x - 3y = 1; x + 2y = 4
Tuesday, April 3, 2012 at 5:31pm

bookkeeping
when a window is displayed in front of another window,its said to be? (a)a screen saver (b)minimized (c)the active window (d)multitasked my answer is c which of the following options is used to view a computers memory properties? (a)device manager (b)control panel (c)...
Tuesday, April 3, 2012 at 12:01pm

bookkeeping
to complete tasks quickly and efficiently a operating system has many special components that are known as? (a)routines (b)scripts (c)system files (d)processes my answer is c to start a program from an icon you should? (a)click the left mouse button (b)double click the left ...
Tuesday, April 3, 2012 at 7:40am

math
a sprinkler system on a baseball diamond rotates 120 degrees and sprays water up to 35 meters. What is the area of the diamond that can be watered with the sprinkler
Monday, April 2, 2012 at 9:37pm

Chemistry
Consider the reaction: N2O4(g) <--> 2NO2(g) delta H^o =58.576kJ; Keq =0.87 at 55degrees celsius What is the effect of each of these changes upon the concentration of N2O4 at equilibrium? a)increasing the temperature b)increasing the volume c) adding more NO2(g) to the ...
Monday, April 2, 2012 at 9:15pm

government
Which of the following statments is true about U.S. roads and highways? A. The Federal Government is a partner with the States in funding higways. B. The Interstate Highway System was completed in the 1950s. C. Few roadways are built with State funds. D. The Federal Government...
Monday, April 2, 2012 at 6:30pm

government
Which word describes the Spanish system of giving control of Indians to a settler for forced labor? A. hacienda B. encomienda C. hacendados D. campesinos
Monday, April 2, 2012 at 6:25pm

psy
17. <11{6[1(07)71]}> The higher the price of an antique, the greater people’s expectation that the object is rare. That, in turn, makes the antique appear more valuable. If the statements above are correct, then offering an antique for sale at a bargain price (...
Monday, April 2, 2012 at 12:31pm

System Analysis
Suppose you are an analyst developing a new executive information system intended to provide key strategic information from existing corporate databases to senior executives to help in their decision making. What type of metholodogy would you use?
Sunday, April 1, 2012 at 7:15pm

science
what you could conclude about the temperature of Mercury based on its position in the solar system?
Sunday, April 1, 2012 at 3:43pm

science
what you could conclude about the temperature of Mercury based on its position in the solar system?
Sunday, April 1, 2012 at 3:04pm

Physics
A dentist's chair with a patient in it weighs 2260 N. The output plunger of a hydraulic system begins to lift the chair when the dentist's foot applies a force of 61 N to the input piston. Neglect any height difference between the plunger and the piston. What is the ...
Sunday, April 1, 2012 at 12:19pm

Physics
The drawing shows two identical systems of objects; each consists of the same three small balls connected by massless rods. In both systems the axis is perpendicular to the page, but it is located at a different place, as shown. The same force of magnitude F is applied to the ...
Sunday, April 1, 2012 at 10:51am

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