Homework Help: Computers: Operating Systems

Recent Homework Questions About Operating Systems

Algebra 2
Solve the system, 4x^2 + y^2 = 20 and y = 4x. (square root of 10/2, 2 square root of 10)?
Friday, May 17, 2013 at 10:08am

MATHS
Find the number of real solutions of the system of equations. x^2−y^2=z y^2−z^2=x z^2−x^2=y
Friday, May 17, 2013 at 6:16am

Algebra
Find the number of real solutions of the system of equations. x^2−y^2=z y^2−z^2 =x z^2−x^2 =y
Thursday, May 16, 2013 at 7:18pm

science
Exhibit a behaviour that you do every day that you think is influenced by heredity and environment. Describe how three of the seven modern perspectives/approaches of psychology would be used to explain your behavior. Make sure that your discussion is not too personal in nature...
Wednesday, May 15, 2013 at 10:20pm

Anatomy & Physiology
Although all of the structures of the respiratory system are in contact with the circulatory system, which respiratory structure is most closely associated with dense network of capillaries? A. pharynx B. vocal folds C. trachea D. alveoli
Wednesday, May 15, 2013 at 7:56pm

psychology
Exhibit a behaviour that you do every day that you think is influenced by heredity and environment. Describe how three of the seven modern perspectives/approaches of psychology would be used to explain your behavior. Make sure that your discussion is not too personal in ...
Wednesday, May 15, 2013 at 5:23pm

physics/chemistry(Thermodynamics)!!!!!helppppp!
In a certain chemical process,a lab technician supplies 254 j of heat to a system. At the same time,73 j of work are done on the system by iys surroundings.What is the increase in the internal energy of the system?
Wednesday, May 15, 2013 at 9:57am

Justice system
Detectives more typically focus their energies on homicide and rape cases, as opposed to burglary and robbery cases, because: A. there is political pressure to do so. B. the victims can more often provide clues that make the cases easier to solve. C. insurance companies can ...
Tuesday, May 14, 2013 at 4:02pm

Justice system
The organization of policing has both bureaucratic and __________ characteristics. A. chaotic B. civilian C. military D. corporate im confused between B n C 2. “Strategic leniency” in police management refers to: A. police discretionary behavior during encounters ...
Tuesday, May 14, 2013 at 3:41pm

Justice system
1. Customs and Border Protection (CBP) is part of the: A. Department of Homeland Security. B. Bureau of Dangerous Drugs. C. Drug Enforcement Administration (DEA). D. U.S. Marshals Service. is it A 2. The most visible private police agency during 19th-century America was the: A...
Tuesday, May 14, 2013 at 3:29pm

Justice system
1. __________ are the largest and most visible segment of the criminal justice system. A. The police B. Court clerks C. The courts D. Attorneys is it A 2. Structurally, policing in the United States is: A. centralized. B. decentralized. C. interdependent. D. nationalized. is ...
Tuesday, May 14, 2013 at 3:18pm

Social Studies
The spread of the factory system resulted in: A. an increase in home production B. increased exports of British cotton good C. poorer quality of iron D. improved working conditions in factories. The industrial Revolution created new jobs in all of the following expect: A. ...
Tuesday, May 14, 2013 at 1:50pm

MATH
For what integer 0<n<1000, does the following system of n linear equations have no complex solution? −10a1a1a1⋮a1+a2−10a2+a2+a2+a3+a3−10a3+a3+…+…++…+an+an+an−10an=9=99=999⋮=10n−1 ...
Tuesday, May 14, 2013 at 9:41am

Algebra Please Help
Find the sum of integers c for all triples of integers (a,b,c),a≤b≤c, that satisfy the system of equations a^2−bc=91 b^2−ac=91 c^2−ab=91 Details and assumptions If a number c appears in several different triples (a,b,c), it must be counted with ...
Monday, May 13, 2013 at 11:04pm

Physical Education
(a) Calculate the average blood velocity in the major arties given that the aorta has a radius of 1.0 cm, the blood velocity is 30 cm/s in the aorta, and the total cross-sectional area of the major arties is 20 cm2 (b) What is the total flow rate? (c) On the assumption that ...
Monday, May 13, 2013 at 10:29pm

HARD CHEM QUESTION- any help appreciated
Phosgene (COCl2) is a poisonous gas that dissociates at high temperature into two other poisonous gases, carbon monoxide and chlorine with equilibrium constant Kp = 0.0041 at 600 K. Find the equilibrium composition of the system after 0.124 atm of COCl2 is allowed to reach ...
Monday, May 13, 2013 at 8:48pm

Thermodynamics
In a multiple-device flow system, I want to determine a state property. Where should I look for information, upstream or downstream?
Monday, May 13, 2013 at 7:18pm

Physical Science
A dentist’s chair with a patient in it weight 2100N. The output plunger of a hydraulic system begins to lift the chair, when the dentist’s foot applies of 55N to the input piston. Neglect any height difference between the plunder and the piston. What is the ratio of ...
Monday, May 13, 2013 at 2:25pm

algebra!!!! please help me!!!!
Find the number of real solutions of the system of equations. x^2−y^2=z y^2−z^2=x z^2−x^2=y
Monday, May 13, 2013 at 10:24am

PreCalculus
PLEASE HELP ME ASAP!!!!!!!!!!!! :) I really need to remember on how to do this equation. Solve the system algebraically. y=25x^2+x 9x+y=3
Sunday, May 12, 2013 at 10:31pm

Physics- Simple machines
A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes. 1) If the mechanical advantage of the system is 30, determine the diameter of the wheel___________m. 2)Determine the effort required to ...
Sunday, May 12, 2013 at 7:04pm

physical chemistry
The system N2O4 <--->2NO2 maintained in a closed vessel at 60º C & a pressure of 5 atm has an average (i.e. observed) molecular weight of 69, calculate Kp. At what pressure at the same temperature would the observed molecular weight be (230/3)
Sunday, May 12, 2013 at 11:41am

Math
Went ahead and did the HW the teach recommended but she did not post the answers and I would like to see if im on the right track. Problem 1: Are the vectors (2,−1,−3), (3, 0,−2), (1, 1,−4) linearly independent? Problem 2 : Is the set {x E R^4 : (x1 &#...
Saturday, May 11, 2013 at 11:51am

Physics
A block of mass m = 2.80kg is held in equilibrium on a frictionless incline of angle= 56.6 by the horizontal force F. (a) Determine the value of F.(b) Determine the normal force exerted by the incline on the block. Hint: Draw a free-body diagram of the block. Choose a ...
Thursday, May 9, 2013 at 9:37pm

social studies
the federal system info on national government (enumerated powers). info on state government (reserved powers) info on both (concurrent powers)
Wednesday, May 8, 2013 at 5:01pm

ochem
Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. Predict the order of elution of the components in this mixture on the TLC plate when solvent system a, b or c is used. a)Cyclohexane: Methylenechloride:100%:0% b)Cyclohexane: ...
Tuesday, May 7, 2013 at 11:25pm

URGENT~MATH For Steve or Reiny
For questions 5-7, find the solution to the system of equations by using either graphing or substitution. 5)y=6-x and y=x-2 (1point) (2,4) (-4,2) (4,2) no solutions 6)y=2x-1 and y=x+3 (1point) (4,7) (7,4) (-7,-4) no solutions 7) y=4x and y+x=5 (1point) (-4,1) (1,4) (-3,2) (2,3...
Tuesday, May 7, 2013 at 2:30pm

Physics
In a control system, an accelerometer consists of a 5.15-g object sliding on a calibrated horizontal rail. A low-mass spring attaches the object to a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the ...
Tuesday, May 7, 2013 at 8:02am

Health
WITH STARS IS MY ANSWER! (*) 1) A drug created by a chemical reaction in some foods, especially fruits and grains A= neurons B= cirrhosis C= alcohol ****** D= depressant 2) Being drunk A= intoxicated ****** B= withdrawal C= alcohol D= minor 3) Cells that make up the nervous ...
Monday, May 6, 2013 at 9:22pm

physics
A 16 lb block rests on a horizontal frictionless surface. A cord attached to the block, running horizontally, passes over a pulley whose diameter is 1 in, to a hanging block weighing 16 lb. The system is released from rest, and the blocks are observed to move 7.6 ft in 4 s. ...
Monday, May 6, 2013 at 9:04pm

Personal Finance
PLEASE HELP ME ASAP!!!!!!!!!!!! 32. Which is not a horrible mortgage option? a. ARM b. Conventional c. Reverse mortgage d. Balloon I answered c and I am not sure if that is right or not. 33. Why do you plan for retirement instead of relying on Social Security to take care of ...
Monday, May 6, 2013 at 7:10pm

justice system
1. “Substantive due process” refers to: A. the content of a law. B. the application of law. C. the application of penalties. D. criminal procedure. is it A 2. __________ is the act of taking a person into custody. A. Search and seizure B. Arrest C. Detention D. ...
Monday, May 6, 2013 at 3:29pm

Justice system
1. Murder implies malice, whereas __________ does not. A. manslaughter B. willful homicide C. forcible rape D. aggravated assault is it A 2. __________ involves sexual intercourse with a corpse. A. Pederasty B. Bestiality C. Necrophilia D. Buggery is it C 3. Fred Brown gets ...
Monday, May 6, 2013 at 3:08pm

Hospitality Management Accounting
i dont really understand what kind of calculations they are asking for Charlie is thinking of spending $3,000 more in year 2004 on advertising (part of marketing expense). Because of his marketing courses, he believes he can design appealing advertisements to be placed in ...
Monday, May 6, 2013 at 7:17am

Introduction to Victimology
•a definition of victimology •its history and how it has developed •explain how its different from criminology, sociology, or psychology •Who established the first safe houses for battered women, as well as where and when these safe-houses were established...
Monday, May 6, 2013 at 12:00am

physics
A light spring with a spring constant of 15.2 N/m rests vertically on the bottom of a large beaker of water, as shown in (a) below. A 5.26 10-3 kg block of wood with a density of 636.0 kg/m3 is connected to the spring, and the mass-spring system is allowed to come to static ...
Sunday, May 5, 2013 at 10:13pm

chemistry
Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an endothermic or an ...
Saturday, May 4, 2013 at 6:24am

WorldHistory
Check? What are the three ways that civilization in western Europe declined after the Roman Empire fell? Answer: 1. Decline of centralized government-Barbarian invasions of Britain, Gaul, Italy and parts of the Eastern Roman Empire led local populations to try to protect ...
Friday, May 3, 2013 at 7:01pm

WorldHistory
How was the structure of the Church like that of the feudal system? Feudalism is based on three things: fief, fealty, and faith. Translation: land, loyalty, religion. So basically the Church was a very important part of feudal society because it owned tons of land throughout ...
Friday, May 3, 2013 at 4:26pm

WorldHistory
Check? What are the three ways that civilization in western Europe declined after the Roman Empire fell? Answer: 1. All government stopped and didn't exist after the fall of Rome. The society fell apart . 2. Because of no government there was no army for protection and ...
Friday, May 3, 2013 at 4:12pm

maths
Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value of a+b? ...
Friday, May 3, 2013 at 4:29am

Sociology
8 complete sentences, compare and contrast the kinship and marriage system of the Kaluli and the Minangkabau.
Friday, May 3, 2013 at 12:14am

statistics
Linda Silbers is a social scientist studying voter opinion about a city bond proposal for a light rail mass transit system in Denver If Linda wants to be 90 percent Confident that her sample estimate of the proportion of voters who favor the bond is within 2 percent of the ...
Thursday, May 2, 2013 at 9:35pm

algebra
Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value of a+b? ...
Thursday, May 2, 2013 at 3:53pm

Math
5. Find the solution to the system of equations by using either graphing or substitution. y = 6 – x and y = x – 2 (2, 4) (–4, 2) (4, 2) no solutions 6. y = 2x – 1 and y = x + 3 (1 point)(4, 7) (7, 4) (–7, –4) infinite solutions 7. y = 4x and y + ...
Thursday, May 2, 2013 at 10:18am

economics
19-1 Bicycle Insurance and Information Asymmetry If bicycle owners do not know whether they are high- or low-risk consumers, is there an adverse selection problem? 19-2 IPOs and Adverse Selection Should owners of a private company contemplating an IPO (a sale of stock to the ...
Thursday, May 2, 2013 at 1:20am

Justice system
Although its meaning may vary from one culture to the next, __________ appears to be an almost universal taboo. A. murder B. rape C. theft D. incest im confused between B n D 2. “Common law” refers to: A. offenses committed against the safety and order of the state. ...
Wednesday, May 1, 2013 at 3:39pm

Justice system
In contrast to the Warren Court, the Burger Court appeared to support a/an: A. due process model. B. crime control model. C. corrections model. D. inmates model. is it B 2. Natural law is best described as: A. the laws of the church. B. a body of principles and rules that are ...
Wednesday, May 1, 2013 at 3:26pm

Justice system
1. The crime control model: A. stresses the possibility of error in the stages leading to trial. B. believes in protecting society from criminal behavior. C. emphasizes the need to protect procedural rights. D. assumes that justice is better served if everyone gets his or her ...
Wednesday, May 1, 2013 at 3:16pm

Justice system
1. The majority of historical and scholarly evidence suggests that poverty: A. and crime tend to increase at the same time. B. may serve to perpetuate crime but is not a major cause of crime. C. and crime are totally unrelated. D. and crime rates stand in an inverse ...
Wednesday, May 1, 2013 at 3:04pm

Chen=mistry
Sodium metal reacts violently with water to form NaOH and release hydrogen gas. Suppose that 3.00 g of Na reacts completely with 3.00 L of water and the final volume of the system is 3 L. What is the molarity M of the NaOH Solution formed by the reaction?
Wednesday, May 1, 2013 at 8:44am

Biology
Which of these systems is involved in connecting one body system with another? A. Integumentary B.Muscular C. Immune D. Digestive E. Endocrine I think its E
Tuesday, April 30, 2013 at 12:10pm

biology
1. The function of the circulatory system is to: A. Deliver oxygen and nutrients to every cell B. facilitate communication between different tissues c. Remove Wastes from tissues d. all of these e.none of these I believe the answer is D all of them
Tuesday, April 30, 2013 at 12:05pm

Statistics
A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a. use the sample data ...
Tuesday, April 30, 2013 at 1:04am

Math
I need help to set the equation up to solve a system to ensure that I get the answer of (-2, 4)? I also need tosolve two problems in the quadratic equation method, the two problems are x to the second power - 2x - 13 = 0 then the other is x to the second power + 12x - 64 = 0 I...
Monday, April 29, 2013 at 10:32pm

Computers
1. An 7-bit counter is wired as follows: The CLK input to the first stage (LSB) is the system clock. Each stage's output is used as the CLK input to the next higher stage. This counter is a: A. MOD 128 ripple counter B. MOD 256 synchronous counter C. MOD 256 ripple counter...
Monday, April 29, 2013 at 3:16pm

algebra
Consider the following system of inequalities: {(c-1)x^2+2cx+c+4<0 { cx^2 + 2(c+1)x+(c+1)>0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value of a+b? Details ...
Monday, April 29, 2013 at 11:46am

physics
A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Two metallic blocks are placed in the water. One is a 50 g piece of copper at 84°C. The other sample has a mass of 58 g and is originally at a temperature of ...
Monday, April 29, 2013 at 11:09am

MAths
Consider the following system of inequalities: (c−1)x^2+2cx+c+4≤0 ---- (1) cx^2+2(c+1)x+(c+1)≥0 ---- (2) The sum of all real values of c, such that the system has a unique solution, can be written as a/b, where a and b are coprime positive integers. What is ...
Monday, April 29, 2013 at 4:20am

economics
Help me reword this?? The Fed is organized as a corporation, owned by its member banks, and directed by a government-appointed board. Monetary policy affects the size of the money supply and the level of interest rates. The first "tool" of monetary policy—and ...
Sunday, April 28, 2013 at 10:15pm

Math
Solve the following system: 4x-y+z=6 2x+y+2z=3 3x-2y+z=3 Find the values for x, y, and z
Sunday, April 28, 2013 at 12:19pm

Physics
A 39.0 kg box initially at rest is pushed 4.50 m along a rough, horizontal floor with a constant applied horizontal force of 135 N. If the coefficient of friction between box and floor is 0.300, find the following. (a) the work done by the applied force J (b) the increase in ...
Sunday, April 28, 2013 at 8:23am

College Physics
A uniform meter stick of mass M has an empty paint can of mass m hanging from one end. The meter stick and the can balance at a point 19.9 cm from the end of the stick where the can is attached. When the balanced stick-can system is suspended from a scale, the reading on the ...
Saturday, April 27, 2013 at 10:55pm

History
My teacher wanted me to make an essay about slavery.. This is my essay: At the time of the American Revolution, the split between North and South over the issue of slavery was apparent but not great enough to prevent the states from uniting as one nation. Delegates to the ...
Saturday, April 27, 2013 at 8:04pm

Physics
Inside an insulated container, a 250-g ice cube at 0°C is added to 200 g of water at 18°C. (i) What is the final temperature of the system? (ii) What is the remaining ice mass?
Saturday, April 27, 2013 at 10:05am

physics
two charge 5NC and -2NC are placed at a point (5cm,0,0)and (23cm,0,0)in a region of a space where there is no other electric field.calculate the electrostatic potential energy of this charged system
Saturday, April 27, 2013 at 3:25am

Physics
A spring oriented vertically is attached to a hard horizontal surface as in the figure below. The spring has a force constant of 1.64 kN/m. How much is the spring compressed when a object of mass m = 2.35 kg is placed on top of the spring and the system is at rest?
Friday, April 26, 2013 at 9:23pm

Lincoln College Of New En
The percentage of physicians who are women is 27.9% in a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of ...
Friday, April 26, 2013 at 1:29pm

Science
What are the diseases of the respiratory system?
Thursday, April 25, 2013 at 11:13pm

physics
A particle moves through an xyz coordinate system while a force acts on it. When the particle has the position vector vector r = (2.00 m)ihat - (3.00 m)jhat + (2.00 m)khat, the force is vector F = Fxihat + (7.00 N)jhat - (5.30 N)khat and the corresponding torque about the ...
Thursday, April 25, 2013 at 11:54am

math pre calc
at the pittsburch zoo, children ride a train for 25 cents, adults pay $1 and seniors pay .75. on a given day, 1400 passengers paid a total of $740 for the rides. there were 250 more children riders than adults and senior riders combined.find the nu,ber of each type of rider. ...
Thursday, April 25, 2013 at 1:28am

Physics! Please help me!
An oscillating block-spring system has a mechanical energy of 5.1 J, an amplitude of 0.81 m, and a maximum speed 1.6 m/s. Find the spring constant k of the spring. What is the mass of the block? What is the frequency of oscillation?
Wednesday, April 24, 2013 at 6:31pm

7th Grade Health Ms. Sue
1. The body's functions are slowed when alcohol reaches where? (1 point) The stomach The heart The liver The brain 2. Which statement is NOT true? (1 point) Regular use of alcohol can lead to addiction. Alcoholism can be cured. Someone cannot cause someone else to drink. ...
Wednesday, April 24, 2013 at 2:09pm

MATH..-HELP ME PLEASE GUYS..THIS DUE TMORROW!!!!..
Suppose tank A consist of 500 liter brine with 500gm salt dissolved in it, whereas in tank B containing 500 liter of water. Water is allowed to enter tank A at a rate of 30 liter/minute, and that mixed solution flow from tank A to tank B at a rate of 40 liter/minute. At the ...
Wednesday, April 24, 2013 at 2:04pm

10 grade algebra
In the following system of equations, what does x equal? -10x - 2y = 56 6x - 2y = -40 x = 6 or x = -6 or x = 2 or x = -2
Wednesday, April 24, 2013 at 9:45am

10 grade algebra
15. In the following system of equations, what does x equal? -10x + 4y = -64 -10x - 8y = -112
Wednesday, April 24, 2013 at 9:29am

PLEASE HELP CHEM!!
You work with the following system: 2X(g) <---> Y(g) At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.
Tuesday, April 23, 2013 at 11:23pm

calculus
the telephone company is planning to introduce two new types of executive communications systems that it hopes to sell to its largest commercial customers. It is estimated that if the first type of system is priced at x hundred dollars per system and the second type at y ...
Tuesday, April 23, 2013 at 10:14pm

Angular Resolution
An astronomer wants to determine whether or not he or she can photograph Castor and Pollux at the same time on a 5 x 8 inch plate using a lens system with a 1200 mm focal length. If the two stars are approximately 5 degrees apart, will it be possible to make the photograph?
Tuesday, April 23, 2013 at 9:45pm

algebra 1,urgent
the expression (4x^2-3x+1)-(x^3+2x+7) what is the coefficient of the x term in the simplified expression? what is an equation of a line parallel to the line with equation 2 y=14-6x a.y=-6x+18 b.y=-3x-9 c.y=6x+3 d.y=3x+8 Solve linear system, which substitution of unkowns is ...
Tuesday, April 23, 2013 at 6:36pm

Medical Billing and Coding
1. You're an outpatient coder in Dr. Smith's office. When you code procedures, you're probably using _______ codes. A. ICD-10-CM B. ICD-9-CM C. HCPCS D. CPT ANSWER 2. You're a coder who's reviewing the record of a 62-year-old woman who was admitted to the ...
Tuesday, April 23, 2013 at 1:16pm

Physics
If in a manufacturing company they want to produce a system where the force F1 must be 10% of the output force F2.if the area of the pistol (where F1 is applied)is 450 spuare milimetre.calculate the diameter of the pistol two where F2 is an output force
Tuesday, April 23, 2013 at 12:43pm

chemistry
In a bottle of unopened cola, the CO2 dissolved in the liquid is in equilibrium with the CO2 gas above the liquid. The dissolved gas reacts with water molecules in the liquid to from carbonic acid, which also dissociates into carbon dioxide and water. Which chemical equation(s...
Tuesday, April 23, 2013 at 12:05pm

Math
System A has a 10% chance of being "down", while system B has a 5% chance of being "down". What is the probability that: 1) Neither computer system will be operational. 2) Both computer systems will be operational. Thanks!
Tuesday, April 23, 2013 at 1:06am

Medical Billing & Coding
1. You're an outpatient coder in Dr. Smith's office. When you code procedures, you're probably using _______ codes. A. ICD-10-CM B. ICD-9-CM C. HCPCS D. CPT ANSWER 2. You're a coder who's reviewing the record of a 62-year-old woman who was admitted to the ...
Monday, April 22, 2013 at 8:53pm

Algebra 1
What is an equation of a line perpendicular to the line with equation y = 1 - 3x a.y=-3x + 5 b. y=3x + 5 c.y=-1/3x + 5 d. y=1/3x + 5 To solve the linear system below, which substitution of unkowns is proper ? x + 4y= -6 5x - 3y = -16 a. substitute -4y-6 for x in the first ...
Monday, April 22, 2013 at 7:00pm

english
is correct to say "the patient was brought to the operating room." ? "was brought" seems awkward. Instead, "the patient was taken to the OR."
Monday, April 22, 2013 at 6:37pm

physics
Calculate the pressure in newtons per square meter due to whole blood in an IV system, such as the one shown in Figure 6.9, if h = 1.5 m. (b) Noting that there is an open tube, so that atmospheric pressure is exerted on the blood in the bottle, calculate the total pressure ...
Monday, April 22, 2013 at 7:45am

chem
Which of the following solutions represent a buffer system? Select all that apply. Answer A. H2CO3 and HCO3- B. HNO2 and NaNO2 C. NH4Br D. Na2SO4 E. HClO4 and NaClO4 F. CH3COOH
Monday, April 22, 2013 at 12:20am

HARD CHEM QUESTION
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <-->2H2(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: the reaction quotient initially.
Sunday, April 21, 2013 at 7:35pm

chem!
You work with the following system: 2X(g) <---> Y(g) At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.
Sunday, April 21, 2013 at 7:34pm

PLEASE HELP CHEM!!
5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(G) + B(G) <--> 3C(G) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.
Sunday, April 21, 2013 at 7:33pm

math
x^2+16xy+y^2-8=0 Write the appropriate rotation formulas so that in a rotated system the equation has no x'y'-term
Sunday, April 21, 2013 at 7:10pm

math numerical methods
Consider the following second order differential equation: y"-2x^(2)y+y^(3)=17cos(4x) with y(0)=4 , y'(0)=-9 If we let u=y and v=y′ then as an AUTONOMOUS first order system, the second order differential equation is correctly expressed as:
Sunday, April 21, 2013 at 3:06am

Daycare managment
1. Which of these is a benefit of unstructured outdoor play? A. Learning of rules B. Emotional well-being C. Video game skill D. Learned helplessness 2. Children are considered obese when they're ______ percent over their ideal body weight. A. 15 B. 10 C. 20 D. 40 3. A(n) ...
Saturday, April 20, 2013 at 4:29pm

Agricultural science
From your research on poultry farming,name one intensive and one extensive system of poultry keeping(farming).
Saturday, April 20, 2013 at 11:12am

Science
An electromagnet is ____. A. a permanent magnet B. made with bar magnets C. able to attract all metal substances D. only operating when the current is on I think it is D..?
Friday, April 19, 2013 at 2:56pm

Algebra 1
1. How many solutions does the linear system have ? 3x - y = 4 -3x + 11y = 2 2. A line passes through the points (6,4) and (5,-3). What is the equation of the line in point-slope form ? a. x - 6 = 7(y-4) b. y - 4 = 7(x-6) c. y + 6 = 7(x+4) d. y - 6 = 7(x-4) 3. A line passes ...
Friday, April 19, 2013 at 10:33am

physics
Consider the Hamiltonian H=Z⊗3 acting on 3 qubits. What is the ground energy of the system? (I.e. the lowest eigenvalue of H?) What is the dimension of the ground energy subspace? (I.e. multiplicity of that eigenvalue?) Which of the following correctly describes the ...
Friday, April 19, 2013 at 5:13am

physical
During July 1995 the comet Shemaker-Levy 9 smashed into Jupiter in a spectacular fashion. The comet actually consisted of 21 distinct pieces, teh largest of which had a mass of about 4x1012 kg and a speed of 6x104 m/s. Jupiter, the largest planet in the solar system , has a ...
Thursday, April 18, 2013 at 11:38pm

Math
Solve for the following system of equAtions for y: 2x + y = 10 3x =y
Thursday, April 18, 2013 at 8:17pm

Algebra 1
1.To solve the linear system below, which substitution of unkowns is proper ? A.substitute 5x-16 for y in the first eqn B.substitute 5x+16 for y in the first eqn C.substitute 5x+12 for y in the first eqn D.substitute 7y-4 for x in the second eqn 2.A line with a slope of -2 ...
Thursday, April 18, 2013 at 7:29pm

government
A multi-party system a. tends to produce a stable government. b. helps one party win the support of a majority of voters. c. is composed of parties with special interests. d. promotes the ideological consensus of the public.
Thursday, April 18, 2013 at 2:08pm

Calc
What is the solution of this system? 2x + 3y = 32 11y − 2x = 52 A. x = 3/2 , y = 5 B. x = 4, y = 8 C. x = 7, y = 6 D. x = 10, y = 4 E. x = 8, y = 16/3
Thursday, April 18, 2013 at 11:56am

English
Please check my answers! Thanks :) 1. In Yeats’s poem “The Second Coming,” the falcon and the falconer are images that most likely represent *something out of control and unnatural. the beauty and abundance of nature. a sad, uncomfortable image of old age. 2. ...
Thursday, April 18, 2013 at 11:20am

chemistry
Explain why exothermic processes are mire likely spontaneous when temperature of the system is low?
Thursday, April 18, 2013 at 9:55am

MECHANICAL ENGINEERING
Need help with some engineering math problems? 1. You wish to determine the total system efficiency of your hydraulic press that is powered by an electric motor. The characteristics of the hydraulic press are as follows: •Electric motor utilizes 5 amps under load & ...
Thursday, April 18, 2013 at 1:07am

Chemistry
What is the pH of a buffer system that contains 0.18M NH4+ and 0.14M NH3? The pKa of NH4+ is 9.25.
Thursday, April 18, 2013 at 12:02am

non linear equations
find all solutions of the system. y+x^2=-5x y-5x=25
Wednesday, April 17, 2013 at 9:53pm

Algebra
2 questions I need some help with please! 1. Find the partial sum S5. an= -2n+16 2.Solve the system by triangularizing the augmented matrix and using bakc substitution. 7x=y-6 3y= -5-2x
Wednesday, April 17, 2013 at 8:38pm

PHYSICS
The only force acting on a particle is conservative force F. If the particle is at point A, the potential energy of the system associated with F and the particle is 39 J. If the particle moves from point A to point B, the work done on the particle by F is +25 J. What is the ...
Wednesday, April 17, 2013 at 7:29pm

U.S/history AP-
--------1870's split in the republican party;wanted a civil service system because they disagreed whith the OLD GUARD Republicans on who should control patronage jobs. Led by senator James G Blaine my answer HALF BREED
Wednesday, April 17, 2013 at 1:14pm

Physics
An 87-kg box is attached to a spring with a force constant of 82 N/m. The spring is compressed 11 cm and the system is released. (a)What is the speed of the box when the spring is stretched by 7.0 cm? (b)What is the maximum speed if the box?
Tuesday, April 16, 2013 at 10:01pm

History please help
Which of the following issues was not on the agenda of the National Organization for Women in the late 1960s a and early 1970s? a. Women should have equal employment opportunities. B. Child care needed to be regulated and more readily available. c. Abortion rights should be ...
Tuesday, April 16, 2013 at 8:54pm

STATISTICS
The manager of an accounting office is studying the problem of incorrect account numbers being entered into the computer system and wishes to produce a p chart. A subgroup of 200 account numbers is selected from each day's enteries and checked to determine the number of ...
Tuesday, April 16, 2013 at 6:12pm

chemistry
Oxygen gas is collected over water at a temperature of 20c. If the totalmpressure of the system is 755mm, what is the pressure of the dry O2 gas?
Tuesday, April 16, 2013 at 12:55pm

U.S/history AP
welthy dutch settlers in New York. Given money and land to set up feudal system. my answer New Netherlands
Monday, April 15, 2013 at 8:14pm

math statitics
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, ...
Monday, April 15, 2013 at 3:08pm

physics
A 2.4-kg cart is rolling along a frictionless, horizontal track towards a 1.3-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts ...
Monday, April 15, 2013 at 9:22am

algebraic systems
ok, so im stumped on this bonus system. there is a hint that the prof. gave that said that all coefficients are 1 or -1. can someone do this and explain how you did it? a + b + c + d + e + f + g + h + k + m = 27 a – b + c + d + e + f + g + h + k + m = 23 a + b - c + d + e...
Monday, April 15, 2013 at 12:44am

BIO
3. Fish have a two chambered heart called a single loop. discuss the benefits and drawbacks of this system. 4. Amphibians have a three chambered heart. Discuss the importance of the extra chamber in terms of the obvious physical differences that amphibians like frogs have from...
Sunday, April 14, 2013 at 10:26pm

Physics
A circuit contains six 270 lamps and a 18.0 heater connected in parallel. The voltage across the circuit is 120 V. (a) What is the current in the circuit when four lamps are turned on? (b) What is the current in the circuit when all lamps are on? (c) What is the current in the...
Sunday, April 14, 2013 at 9:19pm

probability
A computer has 12 hard drives. The probability that an individual hard drive fails within one year is .25. What is the probability that the system will have exactly 4 failures in one year?
Sunday, April 14, 2013 at 7:22pm

Biology
Fish have a two chambered heart called a single loop. Discuss the benefits and drawbacks of this system.
Sunday, April 14, 2013 at 4:13pm

Physics
A rotating uniform-density disk of radius 0.6 m is mounted in the vertical plane. The axle is held up by supports that are not shown, and the disk is free to rotate on the nearly frictionless axle. The disk has mass 5.8 kg. A lump of clay with mass 0.5 kg falls and sticks to ...
Sunday, April 14, 2013 at 4:08pm

Physics
11-098-satellite_and_junk.jpg A spherical satellite of radius 4.6 m and mass M = 195 kg is originally moving with velocity vsatellite,i = < 3000, 0, 0 > m/s, and is originally rotating with an angular speed ?1 = 2 radians/second, in the direction shown in the diagram. A ...
Sunday, April 14, 2013 at 4:06pm

Physics
A device consists of eight balls each of mass 0.4 kg attached to the ends of low-mass spokes of length 1.8 m, so the radius of rotation of the balls is 0.9 m. The device is mounted in the vertical plane. The axle is held up by supports that are not shown, and the wheel is ...
Sunday, April 14, 2013 at 4:01pm

Java programming
can anybody help me.. Multidimensional Array Use a two-dimensional array (for example of 3 by 3) to simulate the addition operation of two matrices. Sample output: the first matrix: 1 2 3 1 0 1 1 2 1 the second matrix: 1 1 1 2 2 2 3 3 3 The total of two matrices: 2 3 4 3 2 3 5...
Sunday, April 14, 2013 at 2:50pm

physics
'a weather station monitors a storm using a radar system. the radio wave pulse emitted is received back at the transmitter after 0.34 ms. the wavelength emitted was 5.6 cm and that received after reflection from the storm was 1 billionth of a meter longer. what information...
Sunday, April 14, 2013 at 8:42am

physics
A gate is free to rotate without friction about its hinges at H. The gate is initially at rest. A 4.00 kg ball of mud is thrown at 18.0 m/s towards the center of the gate and the path of the mud is perpendicular to the plane of the gate. A) Compute the magnitude of the mud'...
Saturday, April 13, 2013 at 4:33pm

business
Healthy Options is a Pharmaceutical Company which is considering investing in a new production line for its pain-reliever medicine for individuals who suffer from cardio vascular diseases. The company has to invest in equipment which costs $2,500,000 and falls within a CCA tax...
Saturday, April 13, 2013 at 4:11pm

Accounting
Basic NPV: No Salvage Value or Taxes Carrie Rushing is considering the purchase of a new production machine that costs $120,000. She has been told to expect decreased annual operating expenses of $40,000 for four years. At the end of the fourth year, the machine will have no ...
Saturday, April 13, 2013 at 3:06am

Managerial Accounting
IRR: Even Cash Flows Williams and Park Accounting Practice is considering investing in a new computer system that costs $9,000 and would reduce processing costs by $2,000 a year for the next six years. Required: Calculate the internal rate of return, using the time value of ...
Saturday, April 13, 2013 at 3:05am

Managerial Accounting
Kim Johnson purchased an asset for $80,000. Annual operating cash inflows are expected to be $30,000 each year for four years. At the end of the life of the asset, Kim will not be able to sell the asset because it will have no salvage value. Required: What is the net present ...
Saturday, April 13, 2013 at 3:02am

car!
Which one of these statements is true about a "bumper-to-bumper" warranty. A. Normal wear and tear is NOT covered by the warranty. B. All expenses except gasoline and routine oil changes are covered by the warranty. C. Every part and system is covered without ...
Friday, April 12, 2013 at 5:40pm

Phyics
In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that ...
Friday, April 12, 2013 at 7:28am

Science URGENT~
1. Your ____ is your first line of defense against pathogens. (1 point) brain heart large intestine skin 2. Blood vessels help regulate your body's temperature. When it's cold, your blood vessels ____ to decrease blood flow and retain heat. (1 point) boil constrict ...
Thursday, April 11, 2013 at 9:57pm

Biology
What type of cell in the central nervous system play an important role in the uptake and processing of neurotransmitters from synaptic clefts? neuron oligodendrocyte microglia endothelial cell ependymal cell
Wednesday, April 10, 2013 at 10:33am

Biology
As should be clear from reviewing the midsagittal plane through the brain, which statement below most accurately describes the components of the ventricular system and/or the circulation of cerebrospinal fluid (CSF)? CSF flows directly from one lateral ventricle through an ...
Wednesday, April 10, 2013 at 10:31am

Biology
Theme A: Surface anatomy of the brain Of the following pairs of directional terms, which pair contains terms that define PERPENDICULAR (orthogonal) directions when applied to the identified region of the central nervous system? in the brainstem, ventral & anterior in the ...
Wednesday, April 10, 2013 at 10:30am

Dynamics of Rigid Bodies
The system of blocks A and B and two pulleys C and D is assembled as shown in the figure. Neglecting friction in and the mass of the pulleys, and assuming that the whole system is initially at rest, determine the acceleration of block A. The coefficient of kinetic friction ...
Wednesday, April 10, 2013 at 6:37am

language
Analogies 1. war:peace::soldier:_____________ marine, captain, conscientious objector, sailor 2. piccolo:flute::violin:_______ cello, saxaphone, trumpet, bass drum 3. strengthen:build up::atrophy:_______ circulatory system, death,muscles, waste away 1.marine 2. cello 3. waste ...
Wednesday, April 10, 2013 at 12:36am

Computer (Visual Basic)
You are in the process of selecting the BackColors and ForeColors for you new application. When you originally learned to use Visual Studio, you were only aware of one of the palettes that was available to you, but your developer colleague informs you that you have more ...
Tuesday, April 9, 2013 at 11:41pm

Chemistry
I'm reviewing for a test and I'm on Le Chatelier's principle. Decreasing the temperature of an exothermic reaction shifts the equilibrium to the right? I understood this weeks ago but now I can't remember. Wouldn't decreasing the temperature cause there to ...
Tuesday, April 9, 2013 at 6:08pm

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