Friday

September 19, 2014

September 19, 2014

**Recent Homework Questions About Operating Systems**

Post a New Question | Current Questions

**Criminal Justice**

1. How do city police chiefs come to power? A. They are elected by voters in specific districts. B. They are appointed by the mayor or selected by the city council. C. They are promoted up through the rank system. D. They are appointed by the outgoing city police chief. im ...
*Sunday, April 13, 2014 at 2:01pm*

**3 questions~~~**

1. What does the term "fair-use exception" mean? (1 point) to use only material that has never been published the ability to use material made by others for educational purposes an exception to copyright restrictions for images only Educational material is no longer ...
*Saturday, April 12, 2014 at 7:35pm*

**Chemistry **

If a particular reaction evolves 192 kJ of heat while expanding from 1.00 L to 2.00 L at 125 atm of pressure, what is the overall energy change for the system?
*Saturday, April 12, 2014 at 3:41pm*

**math**

For the system of linear equations below, use graphing to determine in which quadrant the solution lies. x+2y=-2 -2x+y=14 Quadrant III Quadrant I Quadrant II Quadrant IV
*Saturday, April 12, 2014 at 11:07am*

**science**

Identify and discuss the main safety legislation applicable to the installation, commissioning operating and maintaining the tube swaging machine.
*Saturday, April 12, 2014 at 9:55am*

**physics**

An object-–spring system undergoes simple harmonic motion. If the mass of the object is doubled, what will happen to the period of the motion?
*Friday, April 11, 2014 at 8:01pm*

**World Civilization**

1. In 1789, the National Assembly revoked the privileges of the aristocracy. This occurred in reaction to A. a peasant uprising. B. Louis XVI's withdrawal of troops from Paris. C. discontent among the poor people of Paris. D. the storming of the Bastille 2. What was ...
*Friday, April 11, 2014 at 5:14pm*

**Stats Class**

Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rate by subway riders are uniformly distributed between 5 and 50 ...
*Friday, April 11, 2014 at 10:44am*

**pre algebra**

Check whether (-4, -12) is a solution of the system of equations. y = 6x + 12 2x - y = 4 When the graphs of two equations are parallel, there are infinitely many solutions. y = x + 4 y = 3x solution: ( , )
*Friday, April 11, 2014 at 8:01am*

**prealgebra**

Check whether (-1, 5) is a solution of the system of equations. y = -2x + 3 y = x - 4 I said no because one comes up a positive 5 and the other a negative five. Am I correct
*Friday, April 11, 2014 at 7:57am*

**math**

The Standard blend of coffee uses 4 oz arabica beans and 12 oz of robusta beans per package; the Deluxe blend uses 10 oz of arabica beans and 6 oz of robusta beans per package. The merchant has 80 lbs. of arabica beans and 90 lbs. of robusta beans available. Find a system of ...
*Friday, April 11, 2014 at 12:48am*

**CHEMISTRY**

At 450oC the value of equilibrium constant for the following system is 6.59 x 10-3. If [NH3] = 1.23 x 10-4 and [H2] = 2.75 x 10-3 at equilibrium, determine the concentration of N2 at that point. N2(g) + 3H2(g) 2NH3(g)
*Thursday, April 10, 2014 at 11:20pm*

**PLEASE HELP D: **

Should other states wait to see if the high-speed rail system works well before starting their own plans for similar systems?
*Thursday, April 10, 2014 at 4:01pm*

**Social Studies**

1. Which question would best help you write a report regarding the changes to the political system during Jackson's presidency? (1 point) How did Andrew Jackson react to the results of the election of 1824? When did Andrew Jackson decide to run for president? Did Andrew ...
*Thursday, April 10, 2014 at 9:59am*

**Chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ?E is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*Wednesday, April 9, 2014 at 1:30pm*

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*Tuesday, April 8, 2014 at 2:18pm*

**chemistry**

Are my answers correct? Identify each energy exchange as primarily heat or work and determine weather the sign of ΔE is positive or negative for the system. A. A rolling billiard ball collides with another billiard ball. The first ball (system) stops rolling after the ...
*Tuesday, April 8, 2014 at 10:36am*

**Mass Transfer**

Solution of methanol and ethanol are substantially ideal. (a) Compute the vapour-liquid equilibria for this system at 1 and at 5 atm abs pressure, and plot xy and txy diagrams at each pressure (b) For each pressure compute relative volatilities , and determine an average value...
*Tuesday, April 8, 2014 at 10:35am*

**Math**

During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 7000/1+249 e−0.6 t (b) How many children had the flu after 10 days?
*Sunday, April 6, 2014 at 8:52pm*

**Chem**

The following questions refer to the following system: A total of 30.0 mL of a .10M solution of a monophonic acid (Ka = 1.0 x 10 ^-5) is titrated with .20M sodium hydroxide solution. 1) Before the titration begins, the pH of the solution is about A) 2 B) 5 C) 7 D) 9 E) 12 2) ...
*Sunday, April 6, 2014 at 10:38am*

**Math**

During a flu epidemic, the number of children in the Woodbridge Community School System who contracted influenza after t days was given by the following. Q(t) = 7000 1+249 e−0.6 t (a) How many children were stricken by the flu after the first day? (b) How many children ...
*Saturday, April 5, 2014 at 10:04pm*

**Algebra**

Find the solutions to the system. y = x² + 5x + 6 y = 4x + 12 (1 point)
*Friday, April 4, 2014 at 5:49pm*

**operating system**

ertertertert
*Thursday, April 3, 2014 at 6:13pm*

**Human & Physiology**

Discuss the critical and intricate roles the nervous system plays in homeostasis
*Wednesday, April 2, 2014 at 10:30pm*

**Physics**

For the system of two crates and a pulley in the figure below, what fraction of the total kinetic energy resides in the pulley? (Assume m1 = 14 kg, m2 = 10 kg and mpulley = 5 kg.) (( o )) | | | | [m1] | [m2]
*Tuesday, April 1, 2014 at 9:58pm*

**Chem 1**

An 80.0-gram sample of a gas was heated from 25 degrees celsius to 225 degrees celsius. During this process, 346j of work was done by the system and its internal energy increased by 7785j. What is the specific heat of the gas?
*Tuesday, April 1, 2014 at 7:24pm*

**Algebra II**

One method of irrigating crops is called the center picot system. This system rotates a sprinkler pipe from the center of the field to be irrigated. Suppose a farmer places one of these units at the center of a square plot of land 2500 feet on each side. With the center of ...
*Tuesday, April 1, 2014 at 7:06pm*

**Physics**

A stone is dropped at t = 0. A second stone, with 4 times the mass of the first, is dropped from the same point at t = 110 ms. (a) How far below the release point is the center of mass of the two stones at t = 410 ms? (Neither stone has yet reached the ground.) (b) How fast is...
*Tuesday, April 1, 2014 at 4:44pm*

**physics**

A certain hydraulic system is designed to exert a force 100 times as large as the one put into it. (a) What must be the ratio of the area of the slave cylinder to the area of the master cylinder? (b) What must be the ratio of their diameters? (c) By what factor is the distance...
*Tuesday, April 1, 2014 at 4:26pm*

**chem Help**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?
*Tuesday, April 1, 2014 at 11:57am*

**Chem.**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?
*Tuesday, April 1, 2014 at 12:59am*

**Algebra**

Solve the following system by graphing. If there isn't a unique solution to the system 5x-3y=-36 3x+5y=26
*Monday, March 31, 2014 at 1:34pm*

**chemistry**

2NO (g) + Cl2 (g) <=> 2NOCl (g) (reversible) equilibrium constat = 1 x 10^7 @ certain temp NO = 2.8 x 10^-2 mol Cl2 = 1.4 x 10^-3 mol NOCl = 5.9 mol all mixed in a 1.4 L flask what is Qc and what direction will system go?
*Monday, March 31, 2014 at 12:47pm*

**social studies **

Scientists estimate that 600,000 acres of land will disappear from Louisiana’s coastal region over the next fifty years. Which factor will contribute least to this change? A.hurricanes B.silt buildup C.erosion D.the levee system
*Monday, March 31, 2014 at 7:35am*

**algebra**

A certain car's cooling system has an 8-qt capacity and is filled with a mixture that is 30% alcohol. How much of this mixture must be drained off and replaced with pure alcohol if the solution is to be 50% alcohol?
*Sunday, March 30, 2014 at 11:46pm*

**Computer Science**

Can global user use the windows 7 operating system? What are 5 things that would need to be changed for global users to use windows operating system?
*Sunday, March 30, 2014 at 6:45pm*

**chemistry**

What is the change in the internal energy of the system when 1.243 mol of NH 3(g) is formed from N 2(g) and H 2(g) at 25 degrees C and 1.0 atm?
*Sunday, March 30, 2014 at 6:33pm*

**Physics**

Consider an isolated system consisting of two masses, each of which has a velocity vector in two dimensions. When these two masses collide the total momentum of the system is conserved. (a) Show that if the total momentum of the system is conserved then the component momenta ...
*Sunday, March 30, 2014 at 6:04pm*

**phyics**

A system does 3.7 × 104 J of work, and 8.5 × 104 J of heat flows into the system during the process. Find the change in the internal energy of the system.
*Sunday, March 30, 2014 at 10:36am*

**physics**

Eva is in a closed, dark room. She uses her arm muscles to turn on a lamp. When she moves her hand closer to the lamp, the light heats her hand. The light bounces off the pages of a book and into her eyes. If this room is a closed system, what happens to the total amount of ...
*Saturday, March 29, 2014 at 4:00pm*

**Physics**

Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.
*Friday, March 28, 2014 at 8:48pm*

**Computer Science**

Computers are used worldwide, but most of the major operating systems originated in English-speaking countries. Take a look at the operating system that you use in the context of global users who might not speak English and who might not have grown up with Western customs. ...
*Friday, March 28, 2014 at 9:27am*

**Chemistry**

I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it is E if it is spontaneous at all temperatures...
*Friday, March 28, 2014 at 1:18am*

**science**

an you please solve the questions for me 1. 3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units ...
*Thursday, March 27, 2014 at 2:24pm*

**physics**

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.78x1011 m apart. The larger of the two stars has a mass of 4.19x1030 kg, and its center is 1.75x1011 m from the system's center of mass. What is the mass of the smaller star?
*Thursday, March 27, 2014 at 1:58pm*

**science**

3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units in air, water, sediment and fish in ...
*Thursday, March 27, 2014 at 1:41pm*

**Chemistry**

I would really like to understand how to do these problems, because my exam is coming up in a few weeks. I still cannot comprehend how you can tell if a system is is positive or negative according to reaction. For #1, I presume it is E if it is spontaneous at all temperatures...
*Thursday, March 27, 2014 at 1:58am*

**algebra**

Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts
*Wednesday, March 26, 2014 at 10:39pm*

**Chemistry **

So my chem professor had a slide with a question that follows: If you combine 100 ml of 0.10 M HCl and 100 ml of 0.10 M NaOH, and find that the temperature goes up 0.67 degrees K What is ΔH° for the reac/on: OH(aq)- + H+(aq)->H2O(l)(c H2O= 4.18 J/°C sg, ...
*Wednesday, March 26, 2014 at 10:27am*

**Math**

Admission to a museum cost $12 for adults and $7 for children. A group of 35 people attending the museum paid a total of $315 in admission fee. Write a system of equations to represent the situation. Let A represent the number of adults admissions and C represent the number of...
*Tuesday, March 25, 2014 at 10:48pm*

**History8 Check Answers?**

1) The major problem with the Articles of Confederation was that it _____. a.was too similar to the British system, giving one leader too much power b.it gave the states too much power c.it did not give the states enough power d.it did not establish a system that allowed for a...
*Tuesday, March 25, 2014 at 10:04pm*

**Math**

Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 A) x = -2.125, y = 3.23, and z = 4.555 B) x = 1.661, y = 2.509, and z = 0.404 C) x = 2.509, y = 1.661, and z = -0.404 D) x = 0.260, y = 2.435, and z = 1.375 E) x = 2.435, y = 1.375, and z = 0...
*Tuesday, March 25, 2014 at 10:05am*

**Physics**

You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose ...
*Sunday, March 23, 2014 at 8:38pm*

**Algebra**

Solve the system of equations y=-2(x^2-1) y=2(x^4-2x^2 +1)
*Sunday, March 23, 2014 at 8:08pm*

**Social Studies**

What is a quota system?
*Sunday, March 23, 2014 at 5:20pm*

**material balance**

In a process for concentrating 1000kg of freshly extracted orange juice containing 12.5 wt% solids, the juice is strained, yielding 800kg of strained juice and 200kg of pulpy juice.the strained juice is concentrated in a vacuum evaporator to give an evaporated juice of 58% ...
*Sunday, March 23, 2014 at 1:26am*

**Biology**

The integumentary system includes • skin only** • hair only • nails only • skin, hair, and nails Is my answer correct? the **
*Saturday, March 22, 2014 at 11:09pm*

**Math**

Solve the system using elimination. y = -x + 3 y = x^2 + 1
*Saturday, March 22, 2014 at 6:19pm*

**language of medicine medical billing and coding**

How does the musculoskeletal system change from birth to adulthood and what are the steps that the system goes through from childhood to adulthood to reach 206 bones?
*Friday, March 21, 2014 at 11:55am*

**Math - PreCalc (12th Grade)**

Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 4,3,0 7,0,9 0,4,-1
*Friday, March 21, 2014 at 9:20am*

**History**

During the cold war, people were afraid of communists, both outside and inside the United States. The red scare and mccarthyism that grew out of these fears was damaging to the American way of life. During the mccarthy years, many of the freedoms guarranteed in he bill of ...
*Thursday, March 20, 2014 at 10:44pm*

**Physics**

I don't understand this question... What is the change in entropy for a system that has 250 J of heat added to it at 25°C? (Points : 1) 10 J/K 0.84 J/K 0.84 J/K 10 J/K
*Thursday, March 20, 2014 at 7:32pm*

**Science**

1-Which of the following is not a function of the circulatory system? D-fights infection 2-Which of the following explains why the heart is organized so that it pumps blood to two different locations? D-to provide a way for blood to pick up nutrients at one location and oxygen...
*Thursday, March 20, 2014 at 2:55pm*

**Math - PreCalc (12th Grade)**

Which statement is true for any linear system of two equations in two variables? A) The system is independent if the slopes of the two lines are equal. B) The system is inconsistent if the y-intercepts of the two lines are equal. C) The system is independent if the graphs of ...
*Thursday, March 20, 2014 at 12:24pm*

**chemistry**

Calculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation. a. [OH-] = 2.8 x 10-7 M b. [OH-] = 8.8 x 10-3 M c. [OH-] = 2.4 x 10-11 M everytime I do the problem In the calculator I get system error someone please ...
*Wednesday, March 19, 2014 at 5:05pm*

**math**

Find the solution to the system of equations given below using elimination by addition. 5x + 20y = 40 x + 3y = 6
*Wednesday, March 19, 2014 at 12:17pm*

**Applied Math (Biological application)**

The deformation y(t) of heart muscle from its rest position after t seconds can be modelled as a spring-mass system, described by the differential equation: my" + vy' + ky = F(t) where m, v, and k are positive constants denoting the mass of the myocardial tissue, and ...
*Wednesday, March 19, 2014 at 12:28am*

**Biology**

Briefly describe a portal system and give the location of two portal systems in the human body.
*Tuesday, March 18, 2014 at 7:55pm*

**chemistry**

Calculate the pH of a buffer system composed of 0.880 M C5H5N and 0.660 M C5H5NHNO3. The Kb for C5H5N is 1.70 x 10^-9.
*Tuesday, March 18, 2014 at 10:41am*

**Math**

Point A lies at (2, 3) on a coordinate system. If the coordinate axes are rotated 45°, what is its position on the new coordinate system?
*Tuesday, March 18, 2014 at 9:43am*

**intro to comp**

You need to install an operating system on a computer that will be sharing files for the company employees. You estimate there will be as many as 15 users accessing these files at one time. Which operating system below is ideally suited for this machine? A. Windows 8 Home 64-...
*Monday, March 17, 2014 at 10:34pm*

**Computers**

System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (e). 50 ...
*Monday, March 17, 2014 at 5:16pm*

**Physical Science**

The entropy of an isolated system always do what when natural processes occur?
*Monday, March 17, 2014 at 12:34pm*

**Linear Algebra**

Use Gauss Jordan Elimination to write the solution of the system of equations: x1+4x2+2x3=17 3x1+x2-5x3=7 2x1-3x2-7x3=-10
*Saturday, March 15, 2014 at 8:23pm*

**math**

Suppose you try to solve a system of linear equations using substitution and get this result. 1. x=-2 2. y=12 3. 6=x 4. -8=-8 5. 7=y 8. 5=3
*Saturday, March 15, 2014 at 3:50pm*

**physics**

Two cars approach an ice-covered intersection. One car, of mass 1.26 103 kg, is initially traveling north at 10.6 m/s. The other car, of mass 1.66 103 kg, is initially traveling east at 10.6 m/s. The cars reach the intersection at the same instant, collide, and move off ...
*Friday, March 14, 2014 at 9:44pm*

**physics**

A 10^4 kg train moving at 20m/s stops in a distance of 500m. Calculate the force applied by the train's braking system.
*Friday, March 14, 2014 at 8:56pm*

**Physics**

Two cars are parked on a street. A third car hits the back of the second car and causes all of the cars to move. (Ignore the distance between the cars). Calculate: (a)The acceleration of the whole system; (b)the net force on each car; (c)the contact force that each car exerts ...
*Friday, March 14, 2014 at 7:57pm*

**physics**

What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) g(R−h)R g(R−h)2R2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
*Friday, March 14, 2014 at 7:24am*

**Math**

For what value of a, would the system have an infinite number of solutions? 2x-y=5 8x-47=2a A) 2 B) 4 C)5 D)10 E)20
*Friday, March 14, 2014 at 1:18am*

**Linear Algebra**

I need help please!! How many solutions does the system of equations have? 2x=-10y+6 and x+5y=3 a. one b. two c. infinitely many d. none y=4x+3 and y=4x+4 a. one b. two c. infinitely many d. none x-4y=12 and y=1/4x-3 a. one b. two c. infinitely many d. none
*Thursday, March 13, 2014 at 1:42pm*

**S.S (DAMON)**

1.B 2.A 3.D 4.B 5.B 1. A tropical climate is key to which economic activity in the lowlands of central emerica and the carribean? A. commerce and manufacturing B. production of cash crops C. animal husbandry D. mining 2. Which country has the regions most stable democracy? A...
*Thursday, March 13, 2014 at 1:38pm*

**finance**

A project has an initial requirement of $261,000 for fixed assets and $27,000 for net working capital. The fixed assets will be depreciated to a zero book value over the 4-year life of the project and have an estimated salvage value of $78,000. All of the net working capital ...
*Thursday, March 13, 2014 at 1:07pm*

**S.S (DAMON)**

please check these answer damon or anyone else 1. A tropical climate is key to which economic activity in the lowlands of central emerica and the carribean? A. commerce and manufacturing B. production of cash crops C. animal husbandry D. mining 2. Which country has the regions...
*Thursday, March 13, 2014 at 12:52pm*

**Check my social studies(PLEASE)**

1.D 2.D 3.C 4.A 5.C 6.A 7.B 8.B 9.D 10.A 1. Which natural diasaster poses the most common challenge to central america and caribbean? A. tornadoes B. hurricanes C. floods D. drought 2. Corn cultivations alow the maya civilization to become powerful by A. developing a calendar ...
*Thursday, March 13, 2014 at 11:20am*

**Physics**

Ken has five 200W security lights on outside of home. How much energy do the security lights use in 8 hrs? If the cost of electricity is 8 cents per kWh,what is the cost of operating the security lights ? Please help I'm not sure which formula to use?
*Wednesday, March 12, 2014 at 11:45pm*

**algebra**

Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) 4x + 2y = 12 5x − 4y = 2
*Wednesday, March 12, 2014 at 9:43pm*

**algebra**

Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) x − y = 2 2x + 3y = 19
*Wednesday, March 12, 2014 at 9:41pm*

**please check(Social studies)**

please check my answers thanks 1.B 2.C 3.B 4.B 5.C and D 1.How did the haitian revolution impact the history of the united states? A.It brought the united states into a war with spain over cuba. B.France no longer had haiti,so Napeleon was willing to sell louisiana. C.Slave ...
*Wednesday, March 12, 2014 at 8:04pm*

**Physics**

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic energy of the car&#...
*Wednesday, March 12, 2014 at 6:02pm*

**help with math!!!!**

Solve each system using substitution. Tell whether the system has one solution, infinitely many solutions, or no solution. 13. -x + y = -13 3x - 1 = 19 15. 1/3y= 7/3 x + 5/3 x - 3y = 5 17. 3x + y = -13 -2x + 5y = -54
*Wednesday, March 12, 2014 at 5:11pm*

**Chemistry Urgent**

95.0mL of H2O is initially at room temperature (22.0∘C ). A chilled steel rod at 2.0∘C is placed in the water. If the final temperature of the system is 21.3∘C , what is the mass of the steel bar? Specific heat of water = 4.18 J/g⋅∘C Specific heat...
*Tuesday, March 11, 2014 at 10:38pm*

**chemistry**

95.0mLmL of H2O\rm H_2O is initially at room temperature (22.0∘C\rm{} ^{\circ}C). A chilled steel rod at 2.0∘C\rm ^{\circ}C is placed in the water. If the final temperature of the system is 21.3∘C^{\circ}C, what is the mass of the steel bar? Specific heat of ...
*Tuesday, March 11, 2014 at 10:28pm*

**Physics 141**

A mine car (mass mcar = 444 kg) rolls at a speed of vcar = 0.52 m/s on a horizontal track, as the drawing shows. An mcoal = 141 kg chunk of coal has a speed of vcoal = 0.79 m/s when it leaves the chute. Determine the speed of the car-coal system after the coal has come to rest...
*Tuesday, March 11, 2014 at 10:14pm*

**math**

2. How is the graph of y = –2x² – 5 different from the graph of y = –2x²? (1 point) It is shifted 5 units up. It is shifted 5 units down. It is shifted 5 units left. It is shifted 5 units right. 3. A model rocket is launched from a roof into a large ...
*Tuesday, March 11, 2014 at 8:22pm*

**physics**

Under what conditions is mass conserved? A. Whenever the system is isolated or closed. B. Only when the change is a chemical one. C. Always. D. Only when the change is a physical one. I was thinking A.
*Tuesday, March 11, 2014 at 2:32pm*

**Physics**

A car of mass m moving at a speed v1 collides and couples with the back of a truck of mass 3m moving initially in the same direction as the car at a lower speed v2. (Use any variable or symbol stated above as necessary.) (b) What is the change in kinetic energy of the car&#...
*Monday, March 10, 2014 at 9:26pm*

**Alegbra**

Mary has a total of $5000 invested in two accounts. One account pays 5% and the other 8%. Her interest in the first year was $331. Write and solve a system of equations to find out how much she has invested in both accounts.
*Monday, March 10, 2014 at 3:27pm*

**Chemistry**

A 108 mL gas sample has a mass of 77.96 mg at a pressure of 1140 mmHg and a temperature of 183 Â°C. Assume ideal gas behavior and a completely insulated system, and please donâ€™t forget units with your answers. The system is cooled. Calculate the ...
*Monday, March 10, 2014 at 11:30am*

**Physics**

A rope is used to pull a 5.19 kg block at constant speed 3.38 m along a horizontal floor. The force on the block from the rope is 3.23 N and directed 20.0° above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the ...
*Monday, March 10, 2014 at 10:48am*

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