Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 2,923

**Chemistry**

9. Iron is produced by reducing iron(III) oxide with CO: Fe2O3 + 3 CO → 2 Fe + 3 CO2 ∆H = –23 kJ . How much heat is produced when 1.00 kg of Fe2O3 are reduced?
*November 3, 2011*

**Physics**

A 3.2 kg block with a speed of 11 m/s collides with a 11 kg block that has a speed of 3.3 m/s in the same direction. After the collision, the 3.2 kg block is observed to be traveling in the original direction with a speed of 6.4 m/s. (a) What is the velocity of the 11 kg block...
*November 1, 2011*

**Physics **

The masses usually cancel out of equations, so I'm just guessing that that's what happens here. I just don't know how to start it.
*November 1, 2011*

**Physics **

That's all the information that I'm given.
*November 1, 2011*

**Physics **

Block 1, with mass m1 and speed 4.5 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, with mass m2 = 0.41m1. The two blocks then slide into a region where the coefficient of kinetic friction is 0...
*November 1, 2011*

**External diploma program**

Im looking for 2 formally organized groups they each have to have a affect on one another cooperatively
*October 30, 2011*

**probability**

A jar is filled with nickels and pennies. The value of the nickels is $S and the value of the pennies is $r. If you picked a hundred coins, what is your expected outcome?
*October 30, 2011*

**General Chem lab**

Hi, how do I calculate how many grams of unknown diprotic acid are needed to make 150mL of 0.750N (normal) solution? and to make 125mL of 0.500M (molar) solution? we have 0.5000M of NaOH.. Please help me...
*October 30, 2011*

**physics**

Two wooden crates with masses are as shown are tied together by a horizontal cord. Another cord is tied to the first crate and it is pulled with a force of 199N at a angle of 20.0 degrees. Each crate has a coefficient of kinetic friction of 0.55 . Find the tension in the ropes...
*October 27, 2011*

**General Chemistry **

How do I calculate the concentration of KmNO4 when.. Initial Volume is 50mL 0.11g sodium oxalate Volume of KMnO4 used to titrate oxalate and acid= 34.0 mL Volume of KMnO4 used to titrate acid only= 0.10 mL Please help me Thank you!
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**FRENCH**

kk thanks a lot :):):):):):):):):):):):):):):):):)::):):):):):):):):):):):):):):):)
*October 25, 2011*

**FRENCH**

what do these words in french mean . pleese translate: chez moi une cassette de jazz un boite i did al my other questions but i dont get these
*October 25, 2011*

**SS**

Whos is famous for the quote Ask not what your country can do for you, but what you can do for it?
*October 25, 2011*

**math**

Find the greatest possible length of a rope which can be used to measure exactly the lengths 7m, 3m 85cm and 12m 95cm.
*October 25, 2011*

**history**

The Anti-Federalists _____.
*October 25, 2011*

**math**

what digit is in the tens place in 32? what digit is in the ones place in 32?
*October 24, 2011*

**MATH**

10 2/9 - 3 17/18
*October 23, 2011*

**Math**

The trail is 2989 miles long. It begins in City A and ends in City B. Manfred has hiked 2/7 of the trail before. How many miles has he hiked?
*October 23, 2011*

**Math**

a rectangular laboratory tray is 1/3 feet by 5/4 feet. Find the area
*October 23, 2011*

**PHYSICS**

An object is placed on an incline with friction. The incline is slowly raised from a zero degrees and at 29.2 degrees, the object begins to slide down the incline. The incline is then raised to 40.5 degrees and the object is placed back on the incline. The coefficient of ...
*October 21, 2011*

**COMM 215**

Please guide me on what I have done incorrectly: Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. X True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a good pitcher most of all. X True ...
*October 20, 2011*

**Comm 215**

The original:(make parallel) To succeed in the new economy, workers will have to learn throughout their careers, adapt to changing circumstances, and self-motivation will be needed.
*October 20, 2011*

**Comm 215**

Is this correct 49. To succeed in the new economy, workers will have to learn throughout their careers, adapt to changing circumstances, and have self-motivation.
*October 20, 2011*

**math**

why 13 is odd number. what is defination of odd and even numbers
*October 19, 2011*

**statistics**

Smith is a weld inspector at a shipyard. He know from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be at substandard. Smith checks 7500 shifts completed that shift and finds that 300 of them are substandard. Find the sample...
*October 17, 2011*

**Accounting**

Prepare the entry to record the accrued interest and the amortization of premium on December 31, 2010 using the straight-line method. INFO: Sharapove Co common stock, $100 par 200 shares $37,400 U.S. government bonds, 11%, due 4/1/2020, interest payable 4/1 & 10/...
*October 16, 2011*

**physics**

A golfer takes two putts to get his ball into the hole once he is on the green. The first putt displaces the ball 6.90 m east, the second 7.70 m south. What displacement would have been needed to get the ball into the hole on the first putt?
*October 13, 2011*

**Math**

If something is less than five what will be rounding for that number for example 43, 44, 42
*October 12, 2011*

**math**

explain how u round 85 to nearest ten.
*October 12, 2011*

**Math**

what is rule of rounding a number.
*October 12, 2011*

**Math**

write an addition problem that requires regrouping
*October 12, 2011*

**physics**

A 75.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 24 V, what is the resistance R of the resistor?
*October 11, 2011*

**physics**

A golf ball is hit with an initial velocity of 50 m/s at an angle of 45° above the horizontal. How far will the ball travel horizontally before it hits the ground?
*October 11, 2011*

**Reading**

what is base word for calling, called, calls. what is the base word for burning, burned, burns
*October 10, 2011*

**Reading**

what is base word for calling, called, calls what is base word for burning, burned, burns
*October 10, 2011*

**Reading**

what is base word.
*October 10, 2011*

**math**

How you can rounded 85 to the nearest ten.
*October 10, 2011*

**Chemistry**

Do chemists speed a reaction by using bunsen burners or steam baths because this lowers the activation barrier?
*October 9, 2011*

**CHEMISTRY**

Why must an organic layer be washed with NaOH?
*October 9, 2011*

**geometry**

how do you justify if three lenghs make a triangle?
*October 8, 2011*

**Business Law**

Sam owns an acre of land on Red River. The government dams the river. A lake forms behind the dam, covering Sam's land. Does the government owe Sam anything? I dont want you to give me the answer but maybe just a reference where I could see the law on this case
*October 8, 2011*

**Finance**

99250
*October 6, 2011*

**physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...
*October 6, 2011*

**physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...
*October 6, 2011*

**Pre-Calculus**

It'll help you sove this if you draw a picture.(Not the greatest below but you get the idea) .| . | . | . |x . | ._____________| 25ft The 32 degrees should go in the bottom left corner of the triangle. To solve for x, you would use tangent. The problem would be set up as ...
*October 5, 2011*

**Calculus**

Find the equation of the tangent line to the curve below at point (0,3) y=6/(1+e^-x)
*October 5, 2011*

**6th grade english**

I need help to do adverbs please come and help me on this please anybody.
*October 4, 2011*

**Math**

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 4, 2011*

**Latin. **

I don't know if I need to put them in singular or plural. that's what making me confused. I'm doing the 3rd declension
*October 4, 2011*

**Latin.**

The 3rd delension What's the accusative case for 1. magna urbs 2. rex fortis 3. navis longa 4. matres laetae 5. omnes puellae what's the ablative case for 1. bonus rex 2. puer fortis 3. omnes comites 4. princeps tristis 5. urbes multae
*October 4, 2011*

**Lati**

What's the accusative case for 1. magna urbs 2. rex fortis 3. navis longa 4. matres laetae 5. omnes puellae
*October 4, 2011*

**physics**

Identical +1.39 µC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0 V?
*October 4, 2011*

**Math**

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 4, 2011*

**geometry**

Given a line l, let A be a point on l, and B another point not on l. a. prove all the points of the line segment AB, except for A lie on the same side as B.
*October 4, 2011*

**Calculus**

is there a number a such that the lim x->2 6x^2+ax+a+57/x^+x-6 exists? if so find the value of a and the limit.
*October 3, 2011*

**Science - Chemistry**

A certain elixir is 92 proof. A proof is twice the volume percentage of alcohol in a blend. Ethanol's structural formula is CH3CH2OH with a molar mass of 46 grams/mole. The density is .79 g/ml. How many liters of elixir must one have in order to have 50 moles of carbon?
*September 29, 2011*

**physics**

a European farm has a land area of 0.425km^2. determine this area in acres . 1.000 acre =43,560ft ^2
*September 27, 2011*

**writing decimals**

How do you write 0.013 in expanded notation
*September 27, 2011*

**math**

23.6 repeating in fraction notation
*September 26, 2011*

**math**

23.6repeating find fraction notation
*September 26, 2011*

**math**

23.6 repeating find fraction notation
*September 26, 2011*

**chem**

an aluminum engine block has a volume of 4.77 L and mass of 12.88 kg. whate is the density of aluminum in g/cm 3
*September 24, 2011*

**logic**

g --> h ~h v k g k --> w Prove: W
*September 22, 2011*

**logic**

g --> h ~h v k g k --> w Prove: W
*September 22, 2011*

**math**

6 40/20 6 5/20 =12 9/20 12 9/20 /2=249/20/ 2/1 =249/20 *1/2 =249/40 and the answer was 1 209/40 it had to be a mixed number
*September 20, 2011*

**math**

1 209/40
*September 20, 2011*

**math**

find the average 6 1/5 and 6 1/4
*September 20, 2011*

**math whats wrong with the answer**

(1/4)2 +3/4* 2 3/5 =214/96
*September 19, 2011*

**math**

what is the answer as a integer
*September 19, 2011*

**math**

(1/2)^2 +1/2 * 2 2/3 simplify
*September 19, 2011*

**math**

to find the perimeter, you just have to add the length+width+length+width of all sides. s in this case, the perimeter will be: 80m 80m 100m + 100m = 360m
*September 19, 2011*

**fith grade math**

well i'm trying to do 49 x27 how would you do that?
*September 19, 2011*

**Science**

Pleas unscramble this word acnsrl spherical It's a tool to measure force.
*September 19, 2011*

**Physics **

a uniform rod of 3 kg and length 1 m is suspended from a fixed point by means of strings of length .8m and .6m which are attached to the free ends of the rod such that rod is horizontal. find the tensions in the string
*September 19, 2011*

**Essential Mathemtics 1**

10 2/3 / 4
*September 19, 2011*

**Essential Mathemtics 1**

15 * 4 2/3
*September 19, 2011*

**Essential Mathemtics 1**

13 1/3 / 6 2/9
*September 19, 2011*

**Mathemtics 1**

Lol noooooo 3 1/9 * 2 1/4 is what I'm trying to solve.
*September 19, 2011*

**Mathemtics 1**

I do but it's 3 numbers in both the fractions, on that website, it's only 2.
*September 19, 2011*

**Mathemtics 1**

Uhmmm That didn't help much.
*September 19, 2011*

**Mathemtics 1**

3 1/9 * 2 1/4
*September 19, 2011*

**Essential Mathematics 1**

7 1/3 - 2 5/6
*September 19, 2011*

**Biology**

A student claims the probability a human sperm will receive all chromatids of maternal origin is 50 %. Explain why she is wrong. Are the following true or false and support your answer: i. Red blood cells and nerve cells in adult humans are suitable for karyotyping (...
*September 19, 2011*

**physics**

Did you convert the micro-coloumbs to coloumbs? The equation worked fine for me.
*September 18, 2011*

**physics**

A certain cable car is San Francisco can stop in 10 s when traveling at maximum speed. On one occasion, the driver sees a dog a distance d m in front of the car and slams on the brakes instantly. The car reaches the dog 7.78 s later, and the dog jumps off the track just in ...
*September 15, 2011*

**physics**

A jet plane lands with a speed of 87 m/s and can accelerate at a maximum rate of -5.30 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? What is the actual minimum distance needed to stop ...
*September 15, 2011*

**physics**

A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 12 m/s, skates by with the puck. After 2.0 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 4.0 m/s2, determine each of...
*September 15, 2011*

**physics**

A ball is thrown vertically upward with a speed of +13.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*September 15, 2011*

**physics**

A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 1.50 m/s2 until its engines stop at an altitude of 170 m. (a) What is the maximum height reached by the rocket? (b) How long after lift-off does ...
*September 15, 2011*

**lamar**

3(2x+5)=39
*September 15, 2011*

**Math: Factoring**

3(1+x)^ 1/3 -x(1-x)^ -2/3 -------------------------------- (1+x) sqrt 2/3 please help the line means divisionn of the underlined numbers and variables.
*September 15, 2011*

**Math: Factoring**

sorry i said it wrong. i just posted it again with correct info.
*September 15, 2011*

**Math: Factoring**

yes
*September 15, 2011*

**Math: Factoring**

3(1+x)sqrt 1/3 -x(1-x)sqrt -2/3 -------------------------------- (1+x) sqrt 2/3 please help
*September 15, 2011*

**Spanish**

What article do I use with sueter in spanish
*September 15, 2011*

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