Thursday
June 20, 2013

# Homework Help: Computers: Operating Systems

Recent Homework Questions About Operating Systems

Managerial Economics
The demand for health club services is Q = 350 − 2P and the marginal cost of providing these services is MC = 110 + 2Q. If a two-part tariff pricing system is used, what is the optimal price and quantity combination? a.P = 52 and Q = 240 b.P = 199 and Q = 52 c.P = 26 ...
Tuesday, March 20, 2012 at 10:59pm

AP CHEMISTRY
Consider the reaction. PbCO3(s)<--> PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0 PbO(s...
Tuesday, March 20, 2012 at 4:06pm

Chemistry
What is the equilibrium equations that result when solid NH4F is dissolved in sufficient water to produce 5.0 mL of 0.5M NH4F solution? How would the addition of 5 drops of 0.1M HCl affect the equilibrium system. Give an explanation. How would the addition of 5 drops of NaOH ...
Tuesday, March 20, 2012 at 2:52pm

English,maths,physics,chemistry
Topic:machine,a block and tackle of 6 pulleys is used to raise a load of 300N steadily through a height of 30m.if the work done against friction is 2000J. calculate:the work done by effort,the efficiency of the system,the applied effort.
Monday, March 19, 2012 at 5:40pm

AP CHEMISTRY
A)In a chemical reaction two gases combine to form a solid. What do you expect for the sign of ΔS? B) For which of the following processes does the entropy of the system increase? (Select all that apply.) -> alignment of iron filings in a magnetic field -> the ...
Monday, March 19, 2012 at 4:12pm

chemistry
A dynamic equilibrium, Ag2CO3(s) <=> 2Ag+(ag) , CO3 2- (ag), what affect does the addition af HCl have on the system? Does it cause a shift?
Monday, March 19, 2012 at 7:28am

Physics
A 0.31-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 5.6 m. (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone is released? (b) ...
Monday, March 19, 2012 at 4:14am

Physics
Two blocks are connected by a light string that passes over a frictionless pulley as in the figure below. The system is released from rest while m2 is on the floor and m1 is a distance h above the floor. (a) Assuming m1 > m2, find an expression for the speed of m1 just as ...
Monday, March 19, 2012 at 4:12am

algebra
The point of intersection of the graphs of the equations of the system Ax – 4y = 9 4x + By = –1 is (–1, –3). Explain how to find the values of A and B, then find these values.
Sunday, March 18, 2012 at 11:29pm

algebra
Explain why the addition method might be preformed over the substitution method for solving the system 2x – 3y = 10 5x + 2y = 6 What is the solution of this system?
Sunday, March 18, 2012 at 11:29pm

algebra
Can someone help me figure this out please? when you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? thank you anyone
Sunday, March 18, 2012 at 11:25pm

algebra
I need help. Can someone help me please. Explain how you can determine from the graph of a system of two linear equations in two variables whether it is an inconsistent system of equations. Thank you
Sunday, March 18, 2012 at 11:23pm

Chemistry Equilibrium Constant
The initial pressures for I2 (g), H2(g), and HI(g) were Pi2 = 0.100 atm, Ph2 = 0.200 atm, and Phi = 0 atm, respectively. After the system came to equilibrium, the pressure of I2 (g) became very low, PI2 = 1.00 x 10^-5 atm. Calculate the equilibrium constant Kp for this reaction
Sunday, March 18, 2012 at 11:15pm

operating system
The proprietor serves an average of 800 students a day, with inter-arrival times following an exponential distribution. Most students check out with very few items, but there are some that do all their grocery shopping there, which results in service times that are non-...
Sunday, March 18, 2012 at 6:21pm

Math 209
Predicting Home Prices Selling prices of homes can depend on several factors such as size and age. The accompanying table shows the selling price for three homes. In this table, price P is given in thousands of dollars, age A in years, and home size S in thousands of square ...
Saturday, March 17, 2012 at 7:24pm

physics
Two children, each with mass m = 11.0 kg, sit on opposite ends of a narrow board with length L = 4.5 m, width W = 0.30 m, and mass M = 9.4 kg. The board is pivoted at its center and is free to rotate in a horizontal circle without friction. What is the rotational inertia of ...
Friday, March 16, 2012 at 10:33pm

physics
Three particles, each of mass 3.0 kg, are fastened to each other and to a rotation axis by three massless strings, each 0.360 m long, as shown in the Figure. The combination rotates around the rotation axis with an angular velocity of 19.0 rad/s in such a way that the ...
Friday, March 16, 2012 at 10:32pm

Finance
Cost Allocation It started with a letter Statendam, November 5, 2001 To: Henk Jacobs, director finance department From: Bob Jansen, manager refuse collection department Dear Henk, Someone told me that you had to see the teachers of one or your children last night, so you could...
Friday, March 16, 2012 at 5:33pm

Algebra 1B--
Solve the following system of inequalities by graphing. 5x - 4y ≥ -20 3x - 2y ≤ -8 y ≥ -3 I need help, like a website or steps on how to do this. I don't get it, at all.
Friday, March 16, 2012 at 1:20pm

physics
The system shown below consists of a block of mass M = 4.4 kg resting on a frictionless horizontal ledge. This block is attached to a string that passes over a pulley, and the other end of the string is attached to a hanging block of mass m = 1.9 kg. The pulley is a uniform ...
Friday, March 16, 2012 at 12:52am

A study of the system, H2(g) + I2(g) == 2 HI(g), was carried out. Kc = 54.9 at 699.0 K (Kelvin) for this reaction. A system was charged with 2.50 moles of HI in a 5.00 liter vessel as the only component initially. The system was brought up to 699.0 K and allowed to reach ...
Thursday, March 15, 2012 at 1:42pm

For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction? Kp would = CaCO3/(CaO)(CO2) I do not know what to do with the 0.500M and 1.00mol. Chemistry...
Thursday, March 15, 2012 at 1:02pm

physics
Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in the figure below. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is &#956;k = 0.28. Determine the ...
Thursday, March 15, 2012 at 11:54am

algebra 2
A doctor needs at least 60 adults for a medical study. He cannot use more than 40 men in the study. Write a system of inequalities to model the situation and solve the system by graphing.
Thursday, March 15, 2012 at 2:45am

I did an experiment to study the effects of changes in conditions on an equilibrium system. The first system was the dissociation of acetic acid. HC2H3O2 -> H^+^ + C2H3O2^-^ <- We had to add 2mL of acetic acid into a test tube and we had to test the pH of the solution ...
Wednesday, March 14, 2012 at 10:23pm

political science
An important reason for why public policy and public opinion may not coincide in the United States is that... a) the American system of government includes arrangements, such as an appointed judiciary, which may produce policy decisions that run contraty to prevailing popular ...
Wednesday, March 14, 2012 at 10:02pm

For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction will it go? I think I...
Wednesday, March 14, 2012 at 10:00pm

For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction? Kp would = CaCO3/(CaO)(CO2) I do not know what to do with the 0.500M and 1.00mol.
Wednesday, March 14, 2012 at 9:51pm

A study of the system, H2(g) + I2(g) == 2 HI(g), was carried out. Kc = 54.9 at 699.0 K (Kelvin) for this reaction. A system was charged with 2.50 moles of HI in a 5.00 liter vessel as the only component initially. The system was brought up to 699.0 K and allowed to reach ...
Wednesday, March 14, 2012 at 9:15pm

1) For the reaction system, 2 SO2(g) + O2(g) = 2 SO3(g), Kc has a value of 4.62 at 450.0 K (Kelvin). A system, at equilibrium has the following concentrations: (SO3) = 0.254 M; (O2) = 0.00855 M. What is the equilibrium concentration of SO2? Is set this up as 4.62=(SO3)^2 / (...
Wednesday, March 14, 2012 at 8:27pm

Accounting
§179 expense is available for all of the following business assets except: A. a bulldozer. B. a phone system. C. an apartment complex. D. office furniture. is it A
Wednesday, March 14, 2012 at 7:20pm

In this problem they show a diagram of a pulley system with an inclined plane (25 degree incline). There is a box called m1=47kg resting on the incline plane and m1=35kg hanging on the vertical line. The question reads: The coefficient of friction between m1 and the surfvace ...
Wednesday, March 14, 2012 at 3:45pm

chemistry
For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction?
Wednesday, March 14, 2012 at 12:34pm

chemistry
A study of the system, H2(g) + I2(g) == 2 HI(g), was carried out. Kc = 54.9 at 699.0 K (Kelvin) for this reaction. A system was charged with 2.50 moles of HI in a 5.00 liter vessel as the only component initially. The system was brought up to 699.0 K and allowed to reach ...
Wednesday, March 14, 2012 at 12:29pm

Physic
A point charge q1=-8 is located at the orgin of a rectangular coordinate system. A second charge q2=6nC is located at a distance of 0.2m from the orgin on the positive x-axis, and a third charge q3=12nC is located at a distance of 0.2m on the positive y-axis. Find the ...
Wednesday, March 14, 2012 at 2:02am

earth
Suppose that an object on Earth has a known mass of 80 kgs. Will the mass of that object be less than, more than, or the same as on the other planets in our solar system? Explain your answer.
Wednesday, March 14, 2012 at 12:04am

biology
explain how the hiv virus destroys the immune system.
Tuesday, March 13, 2012 at 9:28pm

Physics
In this problem they show a diagram of a pulley system with an inclined plane (25 degree incline). There is a box called m1=47kg resting on the incline plane and m1=35kg hanging on the vertical line. The question reads: The coefficient of friction between m1 and the surfvace ...
Tuesday, March 13, 2012 at 5:29pm

In this problem they show a diagram of a pulley system with an inclined plane (25 degree incline). There is a box called m1=47kg resting on the incline plane and m1=35kg hanging on the vertical line. The question reads: The coefficient of friction between m1 and the surfvace ...
Tuesday, March 13, 2012 at 4:19pm

Physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.40 1011 m apart. The larger of the two stars has a mass of 3.40 1030 kg, and its center is 2.50 1011 m from the system's center of mass. What is the mass of the smaller star?
Tuesday, March 13, 2012 at 3:26pm

english
i need proof reading with my work if i did any mistake. thanks 1. I learned that soil take crucial role in growing plants. If the soil is healthy, any plant will grew well on that soil. The plant will have a better quality, better flavor, and better nutritional values. 2. ...
Monday, March 12, 2012 at 11:03pm

1. I learned that soil take crucial role in growing plants. If the soil is healthy, any plant will grew well on that soil. The plant will have a better quality, better flavor, and better nutritional values. 2. People buy food that is cheap and convenient. In the market, there ...
Monday, March 12, 2012 at 9:37pm

physics
Calculate the resistance of a 900 watt toaster operating at 120 volts. a) R= 10 ohms b) R=120 ohms c) R= 16 ohms d) R=1.6 ohms
Monday, March 12, 2012 at 9:15pm

AP Chemistry
A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of Na2HPO4 per ...
Monday, March 12, 2012 at 6:42pm

Physics
Calculate the resistance of a 900 watt toaster operating at 120 volts. Which formula do you use?
Monday, March 12, 2012 at 5:07pm

Physics
A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3.3 kg weight is hanging on the string. The system of the weight and disk is released from rest. When the 3.3 kg weight is moving with a speed of 2.1 m/s, what is the kinetic energy of the ...
Monday, March 12, 2012 at 4:20pm

math
Solve the system x^2+y^2-4x+2y=20 4x +3y =5
Monday, March 12, 2012 at 3:30pm

critical thinking test AU
1. Question : The average height of members of the high school basketball team is six feet, three inches. Jerry is on the high school basketball team, so Jerry must be taller than six feet. The argument above is flawed because it confuses: Student Answer: 4 CORRECT an average ...
Monday, March 12, 2012 at 2:10pm

Finance
Firm A has $10,000 in assets entirely financed with equity. Firm B also has$10,000 in assets, but these assets are financed by $5,000 in debt (with a 10 percent rate of interest) and$5,000 in equity. Both firms sell 10,000 units of output at $2.50 per unit. The variable ... Monday, March 12, 2012 at 11:51am Physics Use the first law of thermodynamics to determine the amount of heat change, Q, and whther it was added to or removd from the system. W=225J Delta U=600J Q=? Sunday, March 11, 2012 at 10:43pm Social Studies / History What Segments Of U.S Society Were Affected By The Institution Of Selective Service System ? Sunday, March 11, 2012 at 6:16pm physics Consider a system of N identical particles. Each particle has two energy levels: a ground state with energy 0, and an upper level with energy . The upper level is four-fold degenerate (i.e., there are four excited states with the same energy ). (a) Write down the ... Sunday, March 11, 2012 at 1:20pm Physics The pulley system shown in the figure is used to lift a 52-{\rm kg} crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 2.5 m/s^2. Determine the tension in ... Saturday, March 10, 2012 at 1:58pm Marketing Identify a firm in any industry operating and discuss the segmentation strategies for it's product Saturday, March 10, 2012 at 11:20am math solve the system 7x^2 - 5y^2 + 20y = 3 21x^2 + 5y^2 =209 Saturday, March 10, 2012 at 12:37am american Gov. What distinction does the mayor-council system of city government hold? . . where can I found this?? Thanks Friday, March 9, 2012 at 4:50pm english 11 1. In persuasive writing, it is important to (1 point)anticipate and address counterarguments. clearly state your position. provide facts and examples to back up your position. practice all of the above. 2. “Redskin” was originally a term for (1 point)Indians in ... Friday, March 9, 2012 at 10:00am help check my answer please catring Homework Help: Catering(Gourmet Essentials) 1. In the dining room brigade system, the positions of maitre d’hôtel and/or captain may be combined under the title of A. communard. C. chef de salle. B. boulanger. D. sommelier. 2. Rachel and Mark are discussing the ... Friday, March 9, 2012 at 6:35am biology humans have a double circulation system. there is a low pressure circulation and a high pressure circulation. (a) explain how the structure of the heart enables it to pump blood into two circulations at different pressures Friday, March 9, 2012 at 6:24am physics A horizontal circular platform (m = 108.1 kg, r = 3.25m) rotates about a frictionless vertical axle. A student (m = 85.3kg) walks slowly from the rim of the platform toward the center. The angular velocity, omega, of the system is 2.5 rad/s when the student is at the rim. Find... Thursday, March 8, 2012 at 1:57pm physics Sewage at a certain pumping station is raised vertically by 5.27 m at the rate of 1 930 000 liters each day. The sewage, of density 1 050 kg/m3, enters and leaves the pump at atmospheric pressure and through pipes of equal diameter. (a) Find the output mechanical power of the ... Thursday, March 8, 2012 at 12:22pm Physics A smooth circular hoop with a radius of 0.400 m is placed flat on the floor. A 0.450-kg particle slides around the inside edge of the hoop. The particle is given an initial speed of 8.50 m/s. After one revolution, its speed has dropped to 4.00 m/s because of friction with the ... Thursday, March 8, 2012 at 12:19pm Catering(Gourmet Essentials) THURSDAY March 8, 2012 SCHOOL SUBJECTS - Art - Business - Computers - English - Foreign Languages - Health - Home Economics - Math - Music - Physical Education - Science - Social Studies GRADE LEVELS - Preschool - Kindergarten - Elementary School - 1st Grade - 2nd Grade - 3rd... Thursday, March 8, 2012 at 6:03am Chemistry List at least four distinct advantages of the metric system over "our" measurement system. Thursday, March 8, 2012 at 4:37am Math/ Algebra Give an example of a function using a set of at least 4 ordered pairs. The domain will be any four integers between 0 and +10. The range will be any four integers between -12 and 5. Explain why your example models a function. Give an example of at least four ordered pairs that... Wednesday, March 7, 2012 at 10:50pm business 1. The employees of Abs “R” Us, which includes 12 fitness parlors in and around the metro area, feel they can improve the performance of the company. They decide to pool their resources to purchase the company. This would be called a _______ buyout. A. leveraged C. ... Wednesday, March 7, 2012 at 10:05pm Chemistry during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ... Wednesday, March 7, 2012 at 9:47pm Calculus Could someone help me setup an equation for this equation? --------------------------------- A city bus system carries 4000 passengers a day throughout a large city. The cost to ride the bus is$1.50/person. The owner realizes that 100 fewer people would ride the bus for each...
Wednesday, March 7, 2012 at 7:47pm

Accounting
Blane Company has the following data: Total Sales 800,000, Total Variable Costs 300,000, Fixed Costs 200,000, Units Sold 50,000, What will operating income be if units sold double to 100,000 units?
Wednesday, March 7, 2012 at 4:44pm

Physical science
The engine of a car is being lifted out of the car by using a pulley system. The weight of the engine is 8000N. Use a scale diagram to determine the horizontal force, F1 that a mechanic has to use to hold the engine in such a position that the rope makes an angle of 30degrees ...
Wednesday, March 7, 2012 at 4:36pm

accounting
Schumacher Company uses the perpetual inventory system, and it engaged in the following transactions during 2012: 1) Started the business by issuing common stock for $7,500 cash 2) Paid cash to purchase$5,000 of inventory 3) Sold inventory that cost $3,000 for$7,250 cash 4) ...
Wednesday, March 7, 2012 at 2:03pm

Physics
a frictionless roller coaster car of mass m = 719 kg tops the first hill with speed v0 = 15.2 m/s at height h = 48.9 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy ...
Wednesday, March 7, 2012 at 9:40am

managerial economics
Explain why the cost structure associated with many kinds of information goods and services might imply a market supplied by a small number of large firms. (At the same time, some internet businesses such as grocery home deliveries have continually suffered steep losses ...
Wednesday, March 7, 2012 at 6:45am

Physics
Two horizontal forces F1 and F2 act on a 1.7 kg disk that slides over frictionless ice, on which an xy coordinate system is laid out. Force F1 is in the negative direction of the x axis and has a magnitude of 3.0 N. Force F2 has a magnitude of 9.0 N. What is the angle between ...
Tuesday, March 6, 2012 at 11:43pm

Math
Two children sit on a seesaw that is 14 ft long. One child weighs 95 lb, and the other child weighs 69 lb. If x is the distance of the 69-pound child from the fulcrum when the seesaw balances, state the value of each of the other variables in the lever-system formula F1x = F2(...
Tuesday, March 6, 2012 at 11:27am

physics
Consider the Sun to be at the origin of an xy-coordinate system. A telescope spots an asteroid in the xy-plane at a position given by (1.8 1011 m, 3.1 1011 m) with a velocity given by (-8.4 103 m/s, -6.3 103 m/s). What will be the magnitude of the asteroid's velocity and ...
Tuesday, March 6, 2012 at 9:44am

Chemistry
At equilibrium, the concentrations in this system were found to be [N2] = [O2] = 0.100 M and [NO] = 0.500 M. N2(g) + O2(g) <-> 2NO(g) If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-...
Monday, March 5, 2012 at 10:52pm

Chemistry
Consider this system at equilibrium. A(aq) <-> B(aq) Delta H = +750 kJ/mol .. What can be said about Q and K immediately after an increase in temperature? a] Q > K because Q increased.. b] Q>K because K decreased.. c] Q<K because Q decreased.. d] Q<K because ...
Monday, March 5, 2012 at 10:28pm

Chem 2
The following system is at equilibrium with [N2O4] = 0.55 M and [NO2] = 0.25 M. If an additional 0.10 M NO2 is added to the reaction mixture with no change in volume, what will be the new equilibrium concentration of N2O4? N2O4(g) 2 NO2(g)
Monday, March 5, 2012 at 7:58pm

bus 599
A group of economics students gathered to study for a test on the money and banking system in the U.S. During a fast and furious brainstorm session, Jill scribbled down several key phrases she will use to study tomorrow. Unfortunately, in her haste, all the statements in her ...
Monday, March 5, 2012 at 7:52pm

Chemistry
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 69.8 kJ of heat. Before the reaction, the volume of the system was 8.80 L . After the reaction, the volume of the system was 2.80 L . Calculate the total internal energy change, change in U , in kilojoules.
Monday, March 5, 2012 at 6:09pm

Which economic system is the best solution to handling a crisis of epic proportion
Sunday, March 4, 2012 at 10:37pm

algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -8x – 2y = -28 -3x + 5y = 47
Sunday, March 4, 2012 at 8:10pm

Chem
determine the final temperature of a system after 100.0g of zinc ( specific heat .3876 J/g c) at 95.0 C is immersed into 50.0 g of water at 15.C
Sunday, March 4, 2012 at 7:34pm

government
Sunday, March 4, 2012 at 12:48pm

math
how to solve the set of system equations 6x - y - 2 = 0 dan 3x - 2y + 5 = 0
Sunday, March 4, 2012 at 10:23am

Chemistry
For the reaction system, 2 H2O(g) + O2(g) == 2 H2O2 (g), the equilibrium concentrations are (H2O2) = 0.120 M; (H2O) = 0.860 M; (O2) = 0.330 M. Calculate the value of Kc for this reaction. A. 0.423 B. 0.872 C. 0.0590 D. 1.31 E. 2.51 I did 0.120 / 0.860 X 0.330 = 4.4228 = 4.23...
Saturday, March 3, 2012 at 10:25pm

The equilibrium constant, Kc for the system, CaO(s) + CO2(g) == CaCO3(s), is A. Kc = (CaO) (CO2) / (CaCO3) B. Kc = (CO2) C. Kc = (CaCO3)/(CaO) D. Kc = (CaCO3) / (CaO) (CO2) E. Kc = 1 / (CO2) My answer is (CaCo3) / (CaO)(CO2). Would you agree?
Saturday, March 3, 2012 at 10:04pm

For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction will it go? A. to the...
Saturday, March 3, 2012 at 9:52pm

CHEMISTRY
which of the following represent a buffer system? A.) NaOH and NaBr B.) HF and NaF C.) HC2H3O2 and C12H22O11 D.) HCl and KOH
Saturday, March 3, 2012 at 8:39pm

physics
In raising a 4000-N piano with a pulley system, the workers note that for every 1.6 m of rope pulled downward, the piano rises 0.22 m.Ideally, find the force that is required to lift the piano.
Saturday, March 3, 2012 at 7:03pm

AP CHEMISTRY
A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of Na2HPO4 per ...
Saturday, March 3, 2012 at 4:25pm

physics
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital path of the moons.C) ...
Saturday, March 3, 2012 at 3:59pm

Chemistry
during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ...
Saturday, March 3, 2012 at 12:47am

Accounting
Continuing Cookie Chronicle (Note: This is a continuation of the Cookie Chronicle from Chapters 1 through 6.) CCC7 Part 1 Natalie is struggling to keep up with the recording of her accounting transactions. She is spending a lot of time marketing and selling mixers and giving ...
Friday, March 2, 2012 at 4:52pm

physics
Determine for each of the following statements whether it is always true or can be false. In a perfectly inelastic collision, the kinetic energy is conserved. Kinetic energy is conserved in an elastic collision. Two objects of different masses but moving at the same velocity ...
Friday, March 2, 2012 at 1:06pm

physics
A block of mass m1 = 21.3 kg is at rest on a plane inclined by θ = 30.00 degrees. It is connected via a rope and pulley system to another mass m2 = 24.5 kg, as shown. The coefficients of static and kinetic friction between block 1 and the inclined plane are μs = 0....
Friday, March 2, 2012 at 1:03pm

principles of physics
If the Earth had two identical moons in one circular orbit, and the moons were as far apart in that orbit as they could be, the center of gravity of the Earth-moons system would beA) at the center of the Earth.B) outside the Earth, but beyond the orbital path of the moons.C) ...
Friday, March 2, 2012 at 11:27am

Algebra
Use Cramer's rule to solve the following system of equations. If D=0, use another method to solve the system. x+y=11 x-y=5
Friday, March 2, 2012 at 9:50am

algebra
Can someone please help. When you solve a system of equations by the substitution method, how do you determine whether the system of equations is inconsistent? Thanks
Thursday, March 1, 2012 at 9:19pm

algebra
Can someone please help. Explain how you can determine from the graph of a system of two linear equations in two variables whether it is an inconsistent system of equations. Thanks
Thursday, March 1, 2012 at 9:18pm

algebra
a bag contains only nickels and dimes. there are exactly 18 coins in the bag. the amount of money in the bag is $1.25. let x represent the number of nickels in the bag. let y represent the number of dimes in the bag. 1. write a system of equations that correctly models this ... Thursday, March 1, 2012 at 4:27pm American Gov't--please check How are the numbers of electors for each state decided? 1.)Each state gets one elector. 2.)Each state gets two electors. 3.)Each state gets as many electors as it has senators. My answer4.)Each state gets as many electors as it has members of Congress. Which is NOT a factor ... Thursday, March 1, 2012 at 12:59pm math Solve the system x^2+y^2-4x+2y=20 4x +3y =5 Thursday, March 1, 2012 at 9:43am PHYSÝCS I A block of mass m1 = 21.3 kg is at rest on a plane inclined by θ = 30.00 degrees. It is connected via a rope and pulley system to another mass m2 = 24.5 kg, as shown. The coefficients of static and kinetic friction between block 1 and the inclined plane are μs = 0.... Thursday, March 1, 2012 at 6:09am algebra Graph the solution set for the system of linear inequalities y<2x+3 and y>=2x-6 Wednesday, February 29, 2012 at 10:15pm Chemistry For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200C. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction? A. 0.172 B. 0.150 C. 5.82 D. 6.67 E. 2.59 Wednesday, February 29, 2012 at 9:23am Catering(Gourmet Essentials) 1. In the dining room brigade system, the positions of maitre d’hôtel and/or captain may be combined under the title of A. communard. C. chef de salle. B. boulanger. D. sommelier. 2. Rachel and Mark are discussing the requirements of a healthy diet. Rachel says that... Wednesday, February 29, 2012 at 4:44am chemistry As the pH of a system decreases: the [H+] decreases the Kw decreases the [OH-] decreases all of the above Wednesday, February 29, 2012 at 12:52am Physics Please help! Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ... Tuesday, February 28, 2012 at 11:08pm Physics Calculate the position of the center of mass of the following pairs of objects. Use acoordinate system where the origin is at the center of the more massive object. Give youranswer not in meters but as a fraction of the radius as requested. Get data from insidethe front cover ... Tuesday, February 28, 2012 at 9:08pm Algebra I have two equations that I need to solve using the elimination method the system is x = y = 9 and 2x - y = -3 Tuesday, February 28, 2012 at 6:17pm Physics Two point charges, +Q and -Q of mass m, are placed on the ends of a massless rod of length L, which is fixed to a table by a pin through its center. If the apparatus is then subjected to a uniform electric field E parallel to the table and perpendicular to the rod, find the ... Tuesday, February 28, 2012 at 6:11pm Physics Two point charges, +Q and -Q of mass m, are placed on the ends of a massless rod of length L, which is fixed to a table by a pin through its center. If the apparatus is then subjected to a uniform electric field E parallel to the table and perpendicular to the rod, find the ... Tuesday, February 28, 2012 at 6:11pm Chemistry. Please help! For the problems below, I have the answers written but from questions d-i, I don't understand how they got the answer. I tried doing it and somehow I messed up with the formula with 3/2 and 5/2 so please show work on how they got the answers for d-i. In answering this set ... Tuesday, February 28, 2012 at 4:07pm physical science In raising a 5000-N piano with a pulley system, the movers note that, for every 2m of rope pulled down, the piano rises 0.3m. Ideally, show that the force required to lift the piano is 500-N. Tuesday, February 28, 2012 at 4:07pm American Gov't Which is NOT a factor that reinforces America's two-party system? 1.)Broad ideological consensus limits the appeal of radical parties. 2.)The winner-take-all system makes it harder for third parties to gain popularity. 3.)The two-party system was preferred by the Founding ... Tuesday, February 28, 2012 at 1:07pm accounting Meranda Corporation purchases$3,500 of inventory on account from Ashley Corporation. The journal entry to record this purchase for Meranda under a perpetual inventory system is
Tuesday, February 28, 2012 at 12:58am

Taxes
In the US, we have a progressive tax system, which means higher incomes are taxed at a higher rate. But capital gains are not - they are taxed at a flat rate of 15%. This is an example of an institution, a formal "payment" rule, that affects the "tax game"...
Tuesday, February 28, 2012 at 12:03am

chemistry
A container is charged with hydrogen, nitrogen, and ammonia gases at 120°C and the system was allowed to reach equilibrium. What will happen if the volume of the container is increased at constant temperature? 3H2(g) + N2(g) 2 NH3(g)
Monday, February 27, 2012 at 9:24pm

Chemistry
Consider the following equilibrium reaction: NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g) When 100 g of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens to the partial pressure of ...
Monday, February 27, 2012 at 9:13pm

physics
Four very thin rods, each 5.9 m long, are joined to form a square, as part (a) of the drawing shows. The center of mass of the square is located at the coordinate origin. The rod on the right is then removed, as shown in part (b) of the drawing. What are the x- and y-...
Monday, February 27, 2012 at 6:50pm

Math
Monday, February 27, 2012 at 6:43pm

Math
Monday, February 27, 2012 at 6:38pm

Math
Monday, February 27, 2012 at 6:35pm

Math
Monday, February 27, 2012 at 6:28pm

Math
Monday, February 27, 2012 at 6:11pm

Accounting
In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at$8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ... Monday, February 27, 2012 at 4:04pm physics a) A set of crash tests consists of running a test car moving at a speed of 12.6 m/s (27.7 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 69.0 kg (151.8 lbs) dummy is found to move a distance of 0.600 m from the moment the car touches the wall to ... Monday, February 27, 2012 at 1:28pm Physical Science Two Questions Please help! If no friction acts on a diver during a dive, then which of the following statements is true? A) The total mechanical energy of the system increases. B) Potential energy can be converted into kinetic energy but not vice versa. C) (KE + PE)beginning = (KE + PE)end D) all of the... Monday, February 27, 2012 at 11:17am algebra Ticket Prices Two hundred tickets were sold for a baseball game, which amounted to$840. Student tickets cost $3, and adult tickets cost$5. (a) Let x be the number of student tickets sold and y be the number of adult tickets sold. Write a system of linear equations whose ...
Monday, February 27, 2012 at 3:21am

Accounting
In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at$8, and (3) 500 units at $9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ... Monday, February 27, 2012 at 12:15am Physics A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.5 kg mass (m2) that hangs over the side of the shelf 1.2 m above the ground. The system is released from rest at t = 0 and the 2.5 kg mass strikes the ground at t = 0.82 ... Sunday, February 26, 2012 at 8:30pm Physics 12 A block mass m1 lying on a frictionless inclined plane is connected to a mass m2 by a massless cord passing over a pulley. 1.) determine a formula for the acceleration of the system in terms of m1, m2, Ө, and g. 2.)what conditions apply to mass m1 and m2 for the ... Sunday, February 26, 2012 at 8:07pm Accounting In its first month of operations, Cisler Company made three purchases of merchandise in the following sequence: (1) 300 units at$6, (2) 400 units at $8, and (3) 500 units at$9. Assuming there are 200 units on hand at the end of the period, compute the cost of the ending ...
Sunday, February 26, 2012 at 6:38pm

A 3.00 kg stone is tied to a thin, light wire wrapped around the outer edge of the uniform 8.00 kg cylindrical pulley. The inner diameter of the pulley is 60.0 cm, while the outer diameter is 1.00 m. The system is released from rest, and there is no friction at the axle of the...
Sunday, February 26, 2012 at 4:35pm

fin/370
Firm A had $10,000 in assets entirely financed with equity. Firm B also has$10,000, but these assets are financed by $5,000 in debt (with a 10 percent rate of interest) and$5,000 in equity. Both firms sell 10,000 units of output at $2.50 per unit. The variable costs of ... Sunday, February 26, 2012 at 4:22pm math Determine whether the system is consistent, inconsistent, or dependent. 3x - 3y = -9 9x - 9y = -27 Sunday, February 26, 2012 at 4:15pm Math a+s=1970 8a+5s=12220 Please help me solve the system of equation and show your work thanks Saturday, February 25, 2012 at 9:36pm Math Lee has 35 dimes and quarters that total$5.00. Solve the system of equations to find how many dimes and how many quarters he has. d+q=35 0.1d+0.25q=5 Please show your work thanks
Saturday, February 25, 2012 at 9:10pm

Math
Saturday, February 25, 2012 at 8:56pm

Math
Robin cross- stitches bookmarks and wall hangings . A bookmark takes her 1 1/2 days, and a wall hanging takes her 4 days. Robin recently spent 18 days cross- stitching 7 items. Solve the system of equations to find the number of bookmarks b and the number of wall hangings w ...
Saturday, February 25, 2012 at 8:46pm

Math
Saturday, February 25, 2012 at 8:20pm

Math
Saturday, February 25, 2012 at 8:16pm

Math
Saturday, February 25, 2012 at 3:00pm

Math
Saturday, February 25, 2012 at 2:26pm

Chemistry
A system at equilibrium contains I2(g) at a pressure of 0.23 atm and I(g) at a pressure of 0.24 atm. The system is then compressed to half its volume. Find the pressure of I2 when the system returns to equilibrium. Find the pressure of I when the system returns to equilibrium.
Saturday, February 25, 2012 at 12:25am

Math
Friday, February 24, 2012 at 9:33pm

" performance can't be measured , so any effort to link pay with performance is a fantasy. Difeerence in performances are often caused by the system, which means the organization ends up rewarding the circumstances. It's the same thing as rewarding the weather ...
Friday, February 24, 2012 at 8:46pm

american history
I nee help revising my essay here it is This is what my general view on American History. Well let me tell you it’s a course that we all have to take in high school to graduate. In school we are confronted with American History, state History and general courses of the ...
Friday, February 24, 2012 at 7:37pm

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