Thursday

January 29, 2015

January 29, 2015

Total # Posts: 2,873

**math**

r = 2/3t + v, for t
*January 6, 2011*

**Physics**

A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?
*January 5, 2011*

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the percent of patty's cds that are country music cds
*January 5, 2011*

**math **

patty has 123 cds in her music collection. of her cds 27 are country music. estimate the precent of patty's cds that are country music cds
*January 5, 2011*

**Chemistry**

If 3.0 moles of HCl are consumed in the reaction below, how many moles of FeCl3 are produced? 6HCl + Fe2O3 --> 2FeCl3 + 3H2O
*January 4, 2011*

**Chemistry**

In the equation: Fe(NO3)3 (aq) + 3KSCN (aq) forms FeSCN3 (aq) + 3KNO3 (aq) What type of reaction is this? why are there two aqueous solutions as products? Is there a secondary reaction? Finally is there a name for these products?
*January 4, 2011*

**science**

In the equation: Fe(NO©ý)©ý (aq) + 3KSCN (aq) ¡æFeSCN©ý (aq) + 3KNO©ý (aq) Why do two aqueous solutions form? What is this calle? Is there a seconday reaction?
*January 4, 2011*

**Science 6th grade**

I know definitely that it is 3
*December 30, 2010*

**Physics**

A 200kg motorcycle is driving in a circular path at 1 rev per 5 seconds and the circle has r=12m
*December 20, 2010*

**chemistry**

Both H2O and CO2 have 3 atoms, yet one is polar and one is nonpolar. Explain why, using Lewis dot structures in your answer
*December 19, 2010*

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.
*December 16, 2010*

**calculus**

Find the volume of the solid whose base of a solid is the region bounded bythegraphsofy=3x,y=6,andx=0. Thecross␣sections perpendicular to the x ␣ axis are rectangles of perimeter 20.
*December 16, 2010*

**Chemistry (URGENT)**

A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas. 1. What is the partial pressure of the helium gas? 2. What mass of helium...
*December 15, 2010*

**Chemistry**

Green Light has a frequency of about 6.00 * 10^14 s^-1. What is the energy of the green light?
*December 15, 2010*

**geometry**

What is the distance from the origin to the point (14,11)?
*December 15, 2010*

**Toms River**

If you have 23 kids in a class how many of them are 5ft 2ins or taller? And how many are shorter?
*December 15, 2010*

**Geometry**

A train travels uphill at a 12 degree angle. The train rises 150 from the bottom to the top of the hilL. about how long is the track?
*December 14, 2010*

**Substitution method**

x=2y y=2x+3 ??
*December 14, 2010*

**chemistry**

a 52.0 gram sample or water increases in temperature due to the addition of a hot metal from 17.7 degrees C to 24.4 degrees C. How many calories has the water absorbed? how many calories did the metal lose?
*December 13, 2010*

**6th grade**

analogie:After is to before as epilogue is to
*December 12, 2010*

**bio 101**

how the organism in the diagram has evolved physiologically to become suited to its environmen
*December 11, 2010*

**college**

The angle of elevation from point A to the top of a vertical pole is 30.0 degrees. At point B, 6 meters closer to the base of the pole and on a line through the base of the pole and point A, the angle of elevation to the top of the pole is 37.0 degrees. Find the height ( to ...
*December 11, 2010*

**college**

Solve 9 tan x +5 =0, where 0 <= x <= 360
*December 10, 2010*

**Math**

10+4=14 20-1=19 19*14=266
*December 9, 2010*

**Physics**

What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 60 m/s and a second 1500 kg car moving west at 95 m/s? Let east be the positive direction. Answer in units of kg · m/s.
*December 9, 2010*

**MATH**

HOW DO YOU DO INPUT & OUTPUT DIVISION Tables
*December 9, 2010*

**Finance**

A company requires the amount of $1,000,000 in 25 years to retire a bond issue. Assume they can earn 5 3/4% interest compounded daily. What amount would they have to pay quarterly to be able to retire this debt in 25 years?
*December 9, 2010*

**physics**

suppose that a horizontal force of 0.7 n is required to pull a 5.0 kg block across the table at constant speed. what is the initial speed of a 20 g bullet, fired horizontally into the block, if the bullet imbeds in the initially stationary block and causes the block to slide 1...
*December 7, 2010*

**College Chemistry**

Given 400.0 g of hot tea at 80.0C, what mass of ice at 0C must bea added to obtain iced tea at 10.0C? The specific heat of water is 4.18 J/(g*C), The specific heat of water is 4.184 kJ/mol.
*December 6, 2010*

**Chemistry**

At the melting point of benzene, the DH of fusion is 9.95 kJ/mol and the DS of fusion is 35.7 J/K.mol. What is the temperature at which benzene melts?
*December 6, 2010*

**PHYSICS: Waves in Media**

An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
*December 6, 2010*

**10th grade**

a 5.0 kg bowling ball is rolling down the lane at 4.0 m/s. what is the kinetic energy of the bowling ball?
*December 6, 2010*

**college**

An essay on- To what extent was president andrew jackson one of the nation'smost effective president?
*December 4, 2010*

**Chemistry**

Caluclate the delta H for this reaction using standard enthalpies of formation. (The standard enthalpy of formation of liquid pentane is -146.8kJ/mol. Balanced equation balanced equation: C5H12(l)+8O2(g)-->5CO2+6H2O(g) CO2=393.5 H2O=40.7
*December 4, 2010*

**physics**

At 10:15 am snail 1 crossed the 65 cm mark with a velocity of 4cm/min. In a great burst of energy, Snail 1 raced to the 90 cm mark in 3 minutes. His velocity as he crossed the 90 cm mark was 7cm/min. What was the acceleration of Snail 1?
*December 4, 2010*

**Chemistry**

A large sport utility vehicle has a mass of 2500kg. Calculate the mass of CO2 emitted into the atmosphere upon accelerating the SUVfrom 0.0mph to 66.0 mph. Assume that the required energy comes from the combustion of octane with 30% efficiency. (Hint: Use KE= 1/2mv^2 to ...
*December 3, 2010*

**Biology**

Please help !!!! two bacteria, "Claire" and "Bob" are infected with a virus. Claire explodes several hours later and Bob lives happily ever after.... until one day when Bob feels stressed out and all the sudden, explodes as well. What happened to bacteria &...
*December 2, 2010*

**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*

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