Saturday

October 25, 2014

October 25, 2014

**Recent Homework Questions About Operating Systems**

Post a New Question | Current Questions

**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*

**Physics**

The southwest corner of a football field is selected as the origin of a rectangular coordinate system. A football is placed on the field at (x, y) = (37.7 m, 62.2 m). How long would it take a student, walking at a speed of 1.93 m/s, directly from the corner towards the ...
*Sunday, March 9, 2014 at 10:27pm*

**Ashford PHI 208**

PHI 208 Week 2 - Readings Quiz 1. Tom Regan’s view of animals is that (Points : 1) They are important but not quite as important as human beings They have rights, which means that they should never be used for human purposes They may be ethically used because they were ...
*Sunday, March 9, 2014 at 7:47pm*

**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&#...
*Saturday, March 8, 2014 at 3:15pm*

**Physics**

Block A in the figure weighs 48.0N . The coefficient of static friction between the block and the surface on which it rests is 0.250. The weight w is 6.00N and the system remains at rest. -Find the friction force exerted on block A. -Find the maximum weight w for which the ...
*Saturday, March 8, 2014 at 11:10am*

**Algebra 1 Answer Check (Reiny)**

Factor each trinomial. 1. x^2 + 6x + 5 A: (x + 1)(x +5) 2. x^2 - 7x - 12 A: (x - 3)(x - 4) Solve each system by substitution. 3. 2x - y = 1; x - y = -2 A: (3, 5)
*Friday, March 7, 2014 at 3:37pm*

**Physics**

A string going over a massless frictionless pulley connects two blocks of masses 6.4 kg and 13 kg. As shown on the picture below, the 6.4 kg block lies on a 32◦ incline; the coefficient of kinetic friction between the block and the incline is μ= 0.3. The 13 kg block...
*Thursday, March 6, 2014 at 3:12pm*

**Physics**

1. Two blocks on a frictionless horizontal surface are connected by a light string. where m1 = 6.21 kg and m2 = 19.5 kg. A force of 48.4 N 6.21kg --T-- 19.5kg ----->48.4 N The acceleration of gravity is 9.8 m/s^2. Find the acceleration of the system. Answer in units of m/s^...
*Thursday, March 6, 2014 at 3:08pm*

**physics**

A string going over a massless frictionless pulley connects two blocks of masses 4.4 kg and 11 kg. As shown on the picture below, the 4.4 kg block lies on a 23◦ incline; the coefficient of kinetic friction between the block and the incline is μ = 0.29. The 11 kg ...
*Thursday, March 6, 2014 at 1:24pm*

**physics**

what is the physics behind the process of administering the following 1. measurement of blood pressure using sphygmomanometer 2.giving injections 3.administering intravenous infusion 4.giving oxygen in the ward and operating theater 5. administering blood transfusion 6.sucking...
*Wednesday, March 5, 2014 at 11:04pm*

**Math- NOT CALCULUS**

The hourly profit ($P) obtained from operating a fleet of n taxis is given by P=-2n^2+84n-45 What is the profit if 20 taxis are on the road? What is the maximum hourly profit? What number of taxis gives the max hourly profit? How much money is lost per hour if no taxis are on ...
*Wednesday, March 5, 2014 at 8:58pm*

**Physics**

If m1 = 4.72kg, what mass m2 is required to balance the system? (two masses are connected by a rope. m1 is sitting on an incline and m2 is hanging from a pulley)
*Wednesday, March 5, 2014 at 8:53pm*

**Math **

The hourly profit ($P) obtained from operating a fleet of n taxis is given by P=-2n^2+84n-45 What is the profit if 20 taxis are on the road? What is the maximum hourly profit? What number of taxis gives the max hourly profit? How much money is lost per hour if no taxis are on ...
*Wednesday, March 5, 2014 at 8:10pm*

**computers**

What overriding philosophy of the Windows 8 operating system makes it unique compared to earlier Microsoft operating systems? A. It is a universal operating system for all types of devices. B. It can host both 32- and 64-bit applications. C. Up to 192 users can have a separate...
*Wednesday, March 5, 2014 at 1:37pm*

**Physics**

Two children pull a third child on a snow saucer sled exerting forces F1 and F2 as shown from above in Figure 4.36. Find the acceleration of the 49.00-kg sled and child system. Note that the direction of the frictional force is unspecified; it will be in the opposite direction...
*Tuesday, March 4, 2014 at 11:52pm*

**physics**

A roller-coaster car of mass 1.80 103 kg is initially at the top of a rise at point circle a. It then moves 40.8 m at an angle of 50.0° below the horizontal to a lower point circle b. (a) Find both the potential energy of the system when the car is at points circle a and ...
*Tuesday, March 4, 2014 at 11:26pm*

**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.
*Tuesday, March 4, 2014 at 11:14pm*

**algebra**

The sum of two numbers is 30 and their difference is 2. Find the two numbers by writing and solving a system of equations.
*Tuesday, March 4, 2014 at 10:54pm*

**physics**

A bullet with mass 4.95 g is fired horizontally into a 1.994 kg block attached to a horizontal spring. The spring has a constant 5.58 10^2 N/m and reaches a maximum compression of 6.27 cm. (a) Find the initial speed of the bullet-block system. (b) Find the speed of the bullet.
*Tuesday, March 4, 2014 at 10:06pm*

**History-help**

I need help on this! Please help me! Thank you :) you're a huge blessing! What is driving the economic changes in china and why? What economic system do you believe china is? Why? What are the goals and dreams of the Chinese compared Americans? What are the costs that ...
*Tuesday, March 4, 2014 at 6:50pm*

**Economics**

A clinic has $1 million in revenues and $950,000 in costs. What is its operating margin? My answer is 5% However the second question is if the clinic invested $400,000. What is the return on investment and is it adequate. Not sure how I calculate that. Would I take the 5% of $...
*Tuesday, March 4, 2014 at 2:12pm*

**please check(Social studies)**

im not gonna get frustrated with this anymore because it wont help me but i read some info online and thought these new answers where related to the topic 16.Which aspect of Aztec culture benefitted the Spanish when they were conquering the Aztecs? A.The Aztecs made enemies of...
*Tuesday, March 4, 2014 at 12:19pm*

**Social studies***help*****

HI im Dalia and i just want my answers to be checked for the subject of Social studies.thanks again. 6.Which aspect of Aztec culture benefitted the Spanish when they were conquering the Aztecs? A.The Aztecs made enemies of the surrounding tribes who were more than happy to ...
*Tuesday, March 4, 2014 at 11:44am*

**Astronomy**

Imagine you are on some far away planetary system looking for planets in the galactic neighborhood and you spot our sun in your sky. In degrees, what is the maximum the orbit can be tilted from 90 in order to see a transiting eclipse (assume the longitude angle is 0)?
*Tuesday, March 4, 2014 at 8:18am*

**algebra**

Rachel has 15 coins with a value of $2.85. If the coins are either dimes or quarters, how many of each coin does she have? Write and solve using a system of equations
*Monday, March 3, 2014 at 11:23pm*

**physics**

Find the center of mass of a system composed of three spherical objects with masses of 3.0kg , 1.6kg , and 4.3kg and centers located at (-6.7m , 0), (1.0m , 0), and (2.7m , 0), respectively. Express your answers using two significant figures separated by a comma. xCM, yCM
*Monday, March 3, 2014 at 10:49pm*

**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 3, 2014 at 4:14pm*

**physics**

a truck of mass 8500Kg is pulling a trailer of mass 27 000Kg on a level road.The coefficient of kinetic friction is 0,20.A horizontal force of 75 000N moves the truck forward.question:calculate the magnitude of the acceleration of the system
*Monday, March 3, 2014 at 10:40am*

**Alegbra**

Solve the following systems of equations using the addition (elimination) method. What type of system is it? Name the solution if there is one. 13. x+y=6 x-y=4
*Sunday, March 2, 2014 at 8:46pm*

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