Tuesday

September 16, 2014

September 16, 2014

Total # Posts: 2,731

**Math**

Use the echelon method to solve the following system: x/5+3y=31 2x-y/5=8
*December 2, 2010*

**Math**

Write an expression that represents each question What is 2/3 of 3/8? How many 3/8 are in 2/3?
*December 1, 2010*

**Math**

True?
*December 1, 2010*

**Math**

Is 3/4 between 7/12 and 18/24 on the number line?
*December 1, 2010*

**Science**

The pigment melanin in the skin functions to a. Produce new living cells in the epidermis b.help protect the skin fron sunburn c. Keep water within the skin
*December 1, 2010*

**Science**

When the body becomes too warm blood vessels in the skin become _____?
*December 1, 2010*

**7th grade**

find the next three numbers in the pattern 2/3, 1 5/12, 2 1/6, 2 11/12 _, _, _
*December 1, 2010*

**math**

if 720 can be written as the product of five consecutive integers, determine the middle integer.
*December 1, 2010*

**calculus**

if the area of a triangle with the base 2F and height F-2 is equal to F, compute F.
*December 1, 2010*

**chemistry**

determin the formal charge on each atom in the following molecules and ions. (a)OSCL2 (b)FSO3
*December 1, 2010*

**math**

what is the area and perimeter of 1.7*4
*November 30, 2010*

**algebra**

find the range of the given domain {-1,0,1} f(x)= 3x^2-2x+2
*November 28, 2010*

**college algebra**

g(x)= {x+6, x is less or equal to -4 {1/2x -4, x> -4
*November 24, 2010*

**college algebra**

g(x)= {x+6, x is less or equal to -4 {1-2x -4, x> -4
*November 24, 2010*

**Math**

In traveling across flat land, you notice a mountain in front of you. Its angle of elevation to the peak is 3.5 degrees. After you drive 13 miles closer to the mountain, the angle of elevation is 9 degrees. Approximate the height of the mountain.
*November 22, 2010*

**Math**

A goat is tethered to a stake in the ground with a 5 m rope. The goat can graze to the full length of the rope a fulll 360 around the stake. How much area does the goat have in which to graze? What would be the figure?
*November 22, 2010*

**History**

Is there any website where I could find the picture of the Empresario Grants Coahuila Y Tejas Map?
*November 22, 2010*

**Math**

In traveling across flat land, you notice a mountain in front of you. Its angle of elevation to the peak is 3.5 degrees. After you drive 13 miles closer to the mountain, the angle of elevation is 9 degrees. Approximate the height of the mountain.
*November 22, 2010*

**Math**

How do you figure it out from there though? Because I got that far and couldnt figure out how to solve for x.
*November 22, 2010*

**Math**

In traveling across flat land, you notice a mountain in front of you. Its angle of elevation to the peak is 3.5 degrees. After you drive 13 miles closer to the mountain, the angle of elevation is 9 degrees. Approximate the height of the mountain.
*November 22, 2010*

**General Chemistry**

Calculate the E of the following cell if [CIO3] = 1.5M, [H]= 0.5M, [CI]=1.0M and [CU2]= O.25M: CI03 + 3CU + 6H = CI- +3Cu2+ +2h20
*November 22, 2010*

**physics**

what force is acting on a circular platform rotating opposite of a person standing on the edge?
*November 22, 2010*

**algebra**

-3r+18=6r
*November 21, 2010*

**physics**

So, for the acceleration I got 1.096e-11 is this right?
*November 17, 2010*

**physics**

Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 3.30 m. Two of the spheres have a mass of 3.10 kg each. The third sphere (mass unknown) is released from rest. Considering only the gravitational forces that ...
*November 17, 2010*

**Chemistry**

A helium baloon has a volume of 28.9L, what is the mass of helium inside the ballon? what is the mass of the same volume of air it displaces? MM of air = 29.0g/mol, 25C (temperature) and 1 atm.
*November 17, 2010*

**Calculus**

A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in ...
*November 14, 2010*

**calculus**

A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in feet...
*November 14, 2010*

**AP PHYSICS**

Work done by friction= forcefriction*distance=mu(fn)*distance where fnormal= mg-2.3E2Sin21 Fd= (.200)(.700X9.8X-2.3E2Xsin21)X(7)= Work done by friction=19790.15328.. thats what I got and it is wrong i believe
*November 14, 2010*

**AP PHYSICS**

It did not work thats why I wanted to see if someone else had a better input. It was the wrong answer.
*November 14, 2010*

**AP PHYSICS**

A 2.30 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 21.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 7.00 m. Find the work done by the kinetic ...
*November 14, 2010*

**algebra**

(c+g)(c^2-cg+g^2)
*November 13, 2010*

**Math**

What are the horizonatal asymptotes of y=(1000)/(1+9e^(-.1656x))?
*November 12, 2010*

**Math**

What are the horizonatal asymptotes of y=(1000)/(1+9e^(-.1656x))?
*November 12, 2010*

**Literature**

According to charley's psychiatrist, how can charley's visit to the third level be explained
*November 11, 2010*

**physics**

A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein . The inside diameter of the 4.8 cm long needle is 0.48 mm, and the required flow rate is 4.9 cm^3 of blood per minute. How high h should the...
*November 11, 2010*

**Physics Help!!!**

In one cycle, a heat engine absorbs 5900 J at 360°C and exhausts 520 J. How much work does it do per cycle?
*November 11, 2010*

**math**

If a cardboard box measures 1 1/2 feet on each side what expression will represent the volume of the box
*November 10, 2010*

**western experience**

Oh thats right!My second thoght was E. feminists
*November 9, 2010*

**western experience**

Can someone please check my answers? 1. In the early 1970s the only European nation capable of meeting its own oil production needs was A. Great Britain B. France C. Germany D. the soviet union E. Spain D. The soviet union 2. Which group has seen its imporance in European ...
*November 9, 2010*

**science**

1.accerlate 2.Friction
*November 9, 2010*

**history**

What did Americanization reveal about white Americans view of Native Americans?
*November 9, 2010*

**Physics**

O ok. My teacher told us we had to separate it into 3 separate parts, but i'm not sure how to do that.
*November 9, 2010*

**Physics**

A hot air balloon starts at its launching station and it goes at a horizontal speed of 2.7 m/s and a vertical wind of 1.1 m/s. Once it reaches an altitude of 202 m, it stays at that altitude for 10.3 s, which is when it drops a sandbag. How far will the sandbag land from the ...
*November 9, 2010*

**Western Civilization**

In the postwr West, philosophers and intellectuals have challenged many of the assumptions abouth truth, objectivity, science, and progress that have dominated the Western outlook since the Enlightenment. Summarize the arguments and approaces of the most important poswar ...
*November 9, 2010*

**Physics**

where did you get 4.6*10^6?
*November 8, 2010*

**Physics**

A satellite has a mass of 5600 kg and is in a circular orbit 3.70*10^5 m above the surface of a planet. The period of the orbit is two hours. The radius of the planet is 4.20*10^6 m. What is the true weight of the satellite when it is at rest on the planet's surface?
*November 8, 2010*

**physics**

A man who weighs 50.0 N stands 3.00 m from the right end of a board that is supported by two vertical cords attached to either end of the board. The board is 5.00 m long and weighs 10.0 N. What is the tension in each of the two cords?
*November 7, 2010*

**math**

Explain, in complete sentences, how you would use the graphing method to solve the following system of equations. Provide the solution to the system and explain what the solution represents on the graph. x + 4y = –16 3x + 2y = 12
*November 5, 2010*

**Physics, PLEASE HELP!!**

A long jumper jumps with the initial velocity of 12.0 m/s at an angle of 20 degrees. what is the displacement of x?
*November 5, 2010*

**calculus**

it doesn't work
*November 5, 2010*

**8th grade**

It would be T(n)=20+.75n
*November 5, 2010*

**physical science **

Platinum has a density of 23.4g/cm3. What is its mass?
*November 5, 2010*

**history**

Many subjects connected with our social economy call for immediate improvement. As examples: We should bring more citizens under the coverage of old-age pensions and unemployment insurance. We should widen the opportunities for adequate medical care. We should plan a better ...
*November 5, 2010*

**chemistry**

A stock solution is prepared by adding 26 mL of 1.1 M K3PO4 to enough water to make 30 mL. How many moles of K+ are in 21 mL of the stock solution?
*November 4, 2010*

**Physics-Please help explain**

What happens to a rollercoaster's motion in terms of energy when it goes over a second hill that is higher than the first hill.I think it is because the kinetic energy does not have the momentum so when converted into PE, it can't make it over a higher hill. Coorect or...
*November 4, 2010*

**Physics**

Suppose I apply a force to an initially motionless object. I push on the edge at an angle of 30 degrees. What is the torque on this object in terms of r and F?
*November 4, 2010*

**logarithmic differentiation **

How do you find the logarithmic differentiation of y = x^-cos x ?
*November 4, 2010*

**Social Studies**

Each European group that set up colonies settled in the specific part of the Americas. What are the two facts that lead to that generalization?
*November 2, 2010*

**Social Studies**

Describe the geographical features of your community or region. How might they have influenced people to settle there?
*November 2, 2010*

**physics**

A fountain reaches a height of 140 m. The pumps provide 0.50 m^3/s of water. What is the radius of the jet at the bottom of the fountain? Hint: find the velocity first, then use continuity.
*October 31, 2010*

**physics:energy**

A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power? I tried using 1/2mv^2 and it didn't work.
*October 31, 2010*

**Physics**

I think we might be in the same physics class. For this question I put -12 and was incorrect...what did you put so we can get the answer choices down to two options?
*October 30, 2010*

**4th grade**

PLEASE HELP ME MY HOMEWOrk rK HAVE TO TURENED IT IN TOMMOROW!!!!!!!!!!!!!!!!!!!!!!!!!AAHHHHHHHHHHHHH GOING CRAZY
*October 27, 2010*

**trig**

Rewrite the expression in terms of the first power of the cosine. Use a graphing utility to graph both expressions to verify that both forms are the same. 5 sin6(x)
*October 25, 2010*

**Math**

Using only the numbers 1-8 without repeating any of them, what is _+_=_-_=_-_=_-_=_? And the last number has to be the same as the first cause it's in a circle don't forget!!
*October 25, 2010*

**Senator**

Can you help me write a speech to become the high school senator? i need to get a good one that really hooks the kids.
*October 25, 2010*

**English**

you spelled arrived wrong.
*October 24, 2010*

**English**

What patriotism means to me? any good ideas on what to say?
*October 24, 2010*

**Physics**

A 9.5 kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial distance of 90 cm between the branch and the point where the monkey's mass is located. As the monkey swings through the lowest point on the circle...
*October 24, 2010*

**Physics**

A 9.5 kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. As an approximation, assume a radial distance of 90 cm between the branch and the point where the monkey's mass is located. As the monkey swings through the lowest point on the ...
*October 24, 2010*

**science**

Give the condensed structural formula for 1-butanol. (Type your answer using the format CO2 for CO2.)
*October 23, 2010*

**physics**

In a typical golf swing, the club is in contact with the ball for about 0.0010 . If the 45- ball acquires a speed of 57 , estimate the magnitude of the force exerted by the club on the ball.
*October 22, 2010*

**Statistics**

lbkjub
*October 22, 2010*

**Science**

Give the condensed structural formula for 1-butanol
*October 21, 2010*

**biology**

in biology we are studying taxonomy. we are classifying our organisms by broadest to most specific: kingdom phylum class order family genus species how would i do this for a Siberian tiger?
*October 21, 2010*

**8th grade Science**

What does Air Mass Consist of?
*October 21, 2010*

**physics**

A solid disc with radius R is is spinning. An object exerts a force F at the edge of the disc to slow down the disc. The disc slows down to rest in 2.0 seconds. How long would the disc take to stop if: the mass of the disc doubled in s the radius of the disc doubled in s the ...
*October 21, 2010*

**government**

why would people consider sending united states troops to intergrate a local school?
*October 20, 2010*

**Chemistry**

q= 2409.88 is that right?
*October 20, 2010*

**Chemistry**

What is the enthalpy change when 19.0 g of water is cooled from 33.0°C to 2.70°C?
*October 20, 2010*

**Chemistry**

What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?
*October 20, 2010*

**Chemistry**

What is the enthalpy change when 19.0 g of water is cooled from 33.0°C to 2.70°C?
*October 19, 2010*

**Chemistry**

What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?
*October 19, 2010*

**Chemistry**

A sample of an unknown gas effuses in 11.1 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.02 min. What is the molar mass of the unknown gas?
*October 18, 2010*

**Chemistry**

A sample of an unknown gas effuses in 11.1 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.02 min. What is the molar mass of the unknown gas?
*October 18, 2010*

**phyisc**

Write and balance the reaction for the complete combustion of methanol, CH3OH. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.) 1CH3OH + 2 3 ¨ 4 5 + 6H2O
*October 16, 2010*

**Phyics**

Balance the following equations? a) Fe(OH)2 + 2O2 + 3H2O ¨ Fe(OH)3 (b) 5Sr + 6H2O ¨ 7Sr(OH)2 + 8H2 (c) 9Al + 10Fe3O4 ¨ 11Al2O3 + 12Fe (d) 13Pb(NO3)2 ¨ 14PbO + 15NO2 + 16O2 (e) 17O2 + 18N2H4 ¨ 19H2O2 + 20N2 (f) 21C4H10 + 22O2 &#...
*October 16, 2010*

**Chemistry**

A mixture of 0.47 mole of H2 and 3.59 moles of HCl is heated to 2800C. Calculate the equilibrium partial pressures of H2 Cl2 and HCl if the total pressure is 2.00 atm. For the reaction Kp is 193 at 2800C. H2(g) +Cl2(g) = 2HCl (g) I know that I need to find the total numbers of...
*October 16, 2010*

**Chemistry**

Chemistry equilibrium? Consider the reaction 2NO(g) + O2(g) = 2NO2(g) at 430C an equilibrium mixture consists of 0.020 mole of O2, 0.040 mole of NO, and 0.96 mole of NO2. Calculate Kp for this reaction given that the total pressure is 0.20 atm. I used PV=nRT to find the volume...
*October 16, 2010*

**physics 111**

1) distanceX(ForcepushXcos25) 2) no work - no force in direction of motion 3) no work - no force in direction of motion 4) same as number 1 because table is frictionless and horizontal
*October 15, 2010*

**algebra**

the sum of the four angle measures of any convex quadrilateral is 360 degrees. if a certain convex quadrilater has angle measures of 60, 2y-10, and 10y+5 degrees, what is an expression for the degrees measure of the fourth angle?
*October 15, 2010*

**Physics**

For Vx which is the horizontal velocity component: Vx=d/t Vx=.385m/.350s= 1.10m/s For Vy the vertical velocity component: Vy=gt g=-9.8m/s2 for gravity Vy=(-9.8m/s2)(0.350s)= -3.43m/s
*October 15, 2010*

**math**

Shonda owns a bussiness that transfers photos to CD-ROMs. She charges her customers $24.95 for each CD-ROM. Which of these equations could be use to calculate her profit 'p' for creating 'n' CD-ROMs? a)p=(24.95-0.8)n - 575 b)p=(24.95+0.8)n + 575 c)p=24.95n - ...
*October 14, 2010*

**algebra**

Pythagorean Theorem, The height of sueLo's 5th floor apartment window off the ground is 10 feet longer than the distance from the base of the apartment building to wall. She is concerned that the fire department's 50-foot ladder would not be able to reach her window in...
*October 14, 2010*

**8th grade math**

6/9 because the highest number that can be divided by both the numerator and the denominator is 11, so 66 divided by 11 is 6 and 99 divided by 11 is 9 so you get 6/9.
*October 13, 2010*

**american literature**

Which one of the following statements is not true about the president Ratcliffe portrayed in The General History?
*October 13, 2010*

**Computer Science**

1.Write an Assembly program that reads in a number of cents. The program will write out the number of dollars and cents separately. Sample Run: ? 324 3 24 2. Write an Assembly program to read three numbers in from the user, and output BOTH the sum and the product of the three ...
*October 13, 2010*

**physics**

a 60kg man is on a steadily rotating Ferris wheel. the man is standing on a bathroom scale and the scale reads 45kg at the top of the wheel. take g=10m/s^2 (a) what does the scale read when the man is at the bottom of the wheel? (b)what does the scale read when the man is ...
*October 11, 2010*

**Chemistry**

HNO3+NaOH --- H2O+NaNO3 What is formed in the solution besides Cu(OH)2?
*October 11, 2010*

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