Wednesday

September 28, 2016
Total # Posts: 1,826

**chemistry**

How would you figure: How much energy, in kJ, is absorbed by 23.8 g of acetone when it evaporates if its molar heat of vaporization is 32.0 kJ/mol? Acetone formula is C3H6O

*April 23, 2013*

**physics**

Someone on a glass-bottom boat shines a light through the glass into the water below. A scuba diver beneath that boat sees the light at an angle of 17 degrees with resoect to the normal. If the glass's index of refraction is 1.5 and the water's index of refraction 1.33...

*April 22, 2013*

**math**

a post is driven into the ground. the first strike drives the post 30 inches into the ground. the next strike drives the post 27 inches into the ground. assume these distances form a geometric sequence, what is the total distance the post is driven into the ground after 8 ...

*April 22, 2013*

**trig**

Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?

*April 21, 2013*

**MATH**

1 D = 10^-18 statC·cm = 10^-10 esu·Å = 1⁄299,792,458×10^−21 C·m ≈ 3.33564×10^−30 C·m ≈ 1.10048498×1023 ≈ 0.393430307 au A dipole of 1 Debye is equal to 3.33 x 10-30 C m . Show that in ...

*April 14, 2013*

**Conversion Math**

A dipole of 1 Debye is equal to 3.33 x 10^-30 C m . Show that in atomic units 1 D = 0.39345 au.

*April 14, 2013*

**chemistry**

How many moles of sodium hydroxide are needed to react with 148.0 g of Iron (III) bromide?

*April 12, 2013*

**science**

describe the path of light rays from a leaf to the retina

*April 9, 2013*

**science**

explain the priniciples of light thaat enable the convex lens to function as it does

*April 9, 2013*

**algebra**

A rectangular picture is 2 inches longer than it is wide. When a frame 3 inches wide is placed around the picture, the area covered by the picture and frame is 168 square inches greater than the area covered by the picture alone. What are the dimensions of the picture?

*April 6, 2013*

**Algaebra**

A rectangular swimming pool is 5 feet longer than it is wide. If a concrete walk 2 feet wide is placed around the pool, the area covered by the pool and the walk is 156 square feet greater than the area covered by the pool alone. What are the dimensions of the pool

*April 5, 2013*

**Estimation and Computation**

The ratio of boys to girls in a class is 2:3. If a student is chosen at random to be on the student council, what is the probability it will be a girl?

*March 28, 2013*

**Consumer Math**

On your last credit card statement, you had a previous balance of $567.18, payments of $120, a periodic rate of 1.56 percent, and new charges totaling $45.17. What is your new balance?

*March 26, 2013*

**social studies **

why must people be careful with non rewable resources

*March 13, 2013*

**Physics**

A 40 lb football player runs at 12 mph into a 60 lb player(initially at rest). How fast do the two move after the collision?

*March 13, 2013*

**Physics**

A 100 kg car traveling at 40 m/s bounces off a stationary 300 kg car-recoiling at 20 m/s after the collision. What is the change in momentum during the collision (in kgm/s)?

*March 13, 2013*

**Math **

Which two sqare roots are used to estimate 47 ? (1 point)

*March 13, 2013*

**Stat Help Please**

Yearly stock returns on India's Sensex Index are well described by a Normal model with a mean of 18.36% and a standard deviation of 14.65%. give the stock return cutoff for the middle 30% of all years. I used TI-83 Calc. for these. Can someone check them? Thank you! Q1=...

*March 10, 2013*

**Math Help Please!!!!!**

The number of pounds gained during pregnancy are normal with mean=30.23 and st. deviation=13.84 Determine the percent of women that gain between 20 and 30 pounds.

*March 10, 2013*

**Sociology**

What aspects of the environment and society do sociologists study? (How is studying the environment part of the sociological perspective?)

*March 6, 2013*

**Algebra 2**

X >= 0 Y >= 0 Y <= 1/3X + 3 5 >= y + X

*March 5, 2013*

**physics**

what is the minimum riding speed needed to be able to hear the whistle? Remember, you can assume the following things: The whistle you use to call your hunting dog has a frequency of 21.0 kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can...

*March 4, 2013*

**Geometry**

In the diagram, is an altitude drawn in trapezoid DEFG, DE = 10, EF = 9, FG = 8, and GD = 15. What is mÐD to the nearest degree? 37 53 60 80

*February 27, 2013*

**Math Help Please!!!!**

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to screen.

*February 24, 2013*

**Math Helppp**

The College Board, which are administered each year to many thousands of high school students, are scored so as to yield a mean of 550 and a standard deviation of 100. these scores are close to being normally distributed. what percentage of the scores can be expected to ...

*February 24, 2013*

**Math Help Please!!!!**

The breaking strengths (say, y) for one foot square samples of a particular synthetic fabric are approximately normally distributed with a mean of 2280 pounds per square inch and a standard deviation of 10.6 psi. a) find the probability of selecting a 1 foot square sample of ...

*February 23, 2013*

**statistics**

.1

*February 18, 2013*

**math**

A: 3.648 reapating 8= is rational B:-3 2/13= is rational C: 3.605551275464...=is irrational D: -3.744= is irrational

*February 15, 2013*

**math**

A: 3.648 reapating 8= is rational B:-3 2/13= is rational C: 3.605551275464...=is irrational D: -3.744= is irrational

*February 15, 2013*

**math**

which statement is false: A: 3.648 reapating 8= is rational B:-3 2/13= is rational C: 3.605551275464...=is irrational D: -3.744= is irrational

*February 15, 2013*

**math**

which statement is false? A: 3.648 reapeating=is rational B:-3 2/13=rational

*February 15, 2013*

**math**

solve the system by the elimination method: 3x-2y=2 2x+4y=-5

*February 14, 2013*

**math**

solve the system by the elimination method: 3x-2y=2 2x+4y=-5

*February 14, 2013*

**math**

Ms Sue the answers are a: 60 b: 75 c:80 D70

*February 14, 2013*

**math**

find the perimeter of the actual object using the scale factor shown on hte blueprint. each side is 3 centimeters long. 1cm=5m

*February 14, 2013*

**math**

one last question: find the perimeter of the actual object using the scale factor shown on hte blueprint. each side is 3 centimeters long. 1cm=5m

*February 14, 2013*

**math**

in a mathematics class half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 7. which of the following statements is true about the distribution of scores? A: the mean is greater than the median...

*February 14, 2013*

**math**

solve the system by the elimination method: 4x=5y+24 5x=4y+21

*February 14, 2013*

**math**

write a trinomial of degree 4 such that the GCF of its terms is 1

*February 13, 2013*

**math**

write a trinomial of degree 4 such that the GCF of its terms is 1

*February 13, 2013*

**math**

write a trinomial of degree 4 such that GCFof its terms is 1

*February 13, 2013*

**math**

in a mathematics class, half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 71. which of the following statements is true about the distribution of the scores? a: the mean is greater than the ...

*February 8, 2013*

**math**

in a mathematics class, half of the students scored 91 on an achievement test. with the exception of a few students who scored 47, the remaining students scored 71. which of the following statements is true about the distribution of the scores? a: the mean is greater than the ...

*February 8, 2013*

**Grammer**

thruout history, traveling traders and merchants took home new product such as tea, spices and fabrics as a matter of fact thats one reason civilizations changed.

*February 7, 2013*

**Math HELLPPPPP**

Invent a dataset with five values, with a mean smaller than the median and both the mean and median smaller than the standard deviation. give the data values and the statistics. Mean= Median= Standard Deviation=

*February 7, 2013*

**Statistics Helppppp**

Invent a dataset with five values, with a mean smaller than the median and both the mean and median smaller than the standard deviation. give the data values and the statistics. Mean= Median= Standard Deviation=

*February 7, 2013*

**english**

can you help me with this quote. "circumstances are beyond the control of man; but his conduct is in his own power". What does this really mean??

*February 6, 2013*

**Math**

he can use the finger trick ad count by 5's or he can think as it 9x6 but swicth the numbers around.

*February 4, 2013*

**Soc Help Please**

What is the sociological perspective on global stratification? How does this provide insight into global inequality? Thank you!

*February 4, 2013*

**math**

one farm is 82 acres larger than another. together the farms contain 276 acres how larg is each farm? solve using two variables and two equations

*February 3, 2013*

**math**

one farm is 82 acres larger than another. together the farms contain 276 acres how larg is each farm? solve using two variables and two equations

*February 3, 2013*

**math**

one farm is 82 acres larger than another. together the farms contain 276 acres how larg is each farm? solve using two variables and two equations

*February 3, 2013*

**reading**

an example of parallelism and page in to kill a mockingbird

*February 2, 2013*

**english**

what page

*February 2, 2013*

**english**

in to kill a mockingbird what is an xample of an alliteration

*February 2, 2013*

**geography**

why do you think the colonists finally decided to rebel against Britain?

*January 24, 2013*

**geography**

of course you dont like me never mind

*January 24, 2013*

**geography**

put these wents that led to the start of he American Revolution in the correct chronological order: a: declaration of 1763 b: french and Indian war c: Stamp act d: Boston Massacre e: pontac's rebellion f: Boston tea party g: townshend acts h: intolerable acts i: battle of ...

*January 24, 2013*

**Math**

The answer is C for 4. :)

*January 22, 2013*

**science**

this is a place that is suppose to help you thats not very nice

*January 17, 2013*

**science**

if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?

*January 17, 2013*

**sciene**

if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?

*January 17, 2013*

**science**

if the compressor in a refrigerator stopped working, how would its failure affect the heat transfer cycle?

*January 17, 2013*

**Physics**

A 0.055 kg golf ball leaves the tee at 50 m/s. what is its change in momentum (impulse) ?

*January 16, 2013*

**Math**

A bicycle with 26inch diameter wheels is travelingat 10 mph. To the nearest whole number how may revolutions does each wheel make per minute?

*January 16, 2013*

**geography**

how was colonial america both godly and devilish?

*January 16, 2013*

**science**

lengths of railway tracks have small gaps between them. Why are the tracks built this way and what might happen it there were no gaps?

*January 16, 2013*

**science**

lengths of railway tracks have small gaps between them. Why are the tracks built this way and what might happen it there were no gaps?

*January 16, 2013*

**AP Physics B**

I have one our part question left that I just don't understand! Please help me!! Part 1 An 11.6 kg block of metal is suspended from a scale and immersed in water as in the ﬁgure. The dimensions of the block are 12.9 cm × 9.7 cm × 9.7 cm. The 12.9 cm ...

*January 15, 2013*

**History**

identify two differences between enslaved Aftricans and indentured servants

*January 15, 2013*

**math**

solve using substitution: 4x+9y=24 y=1/3x+2

*January 15, 2013*

**math**

solve using substitution: 4x+9y=24 y=1/3x+2

*January 15, 2013*

**math**

solve using substitution: 4x+9y=24 y=1/3x+2

*January 15, 2013*

**math**

solve with substitution: 4x+y=2 3y+2x=-1

*January 15, 2013*

**math**

solve by using substitution: x=y+7 y-8=2x

*January 15, 2013*

**math**

solve by using subsitution: 4x+y=2 3y+2x=-1

*January 14, 2013*

**math**

solve by using subsitution: 4x+y=2 3y+2x=-1

*January 14, 2013*

**math**

tell whether the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10

*January 14, 2013*

**math**

solve by using subsitution: 4x+y=2 3y+2x=-1

*January 14, 2013*

**math**

tell wheter the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10

*January 14, 2013*

**math**

solve by using subsitution: 4x+y=2 3y+2x=-1

*January 14, 2013*

**math**

solve by using subsitution: 4x+y=2 3y+2x=-1

*January 14, 2013*

**math**

tell whether the system has one solution, infine\itely many solutions, or no solution y=3x-14 y-x=10

*January 14, 2013*

**science**

you are riding to school on the bus in a snowstorm. through the window, you see a lighted sign that gives the temperature as 26 degrees, but you can't make out whether the temperature scale is Celsius or Fahrenheit. which is it and how do you know

*January 14, 2013*

**Math**

375 at 3.75% compounded monthly for 4 years?

*January 9, 2013*

**Biology**

17) B

*January 8, 2013*

**science**

two cyclists are riding their bikes up a steep hill. hessica rides her bike straight up the hill. adrian rides his bike up the hill in a zigzag path. adrian and jessica have identical masses. once they reach the top of the hill, does adrian have less gravitational potential ...

*January 7, 2013*

**science**

and i dont get it

*January 7, 2013*

**science**

how much gravitational potential energy does the pile driver have when it is lifted to a height of 15m? show work please

*January 7, 2013*

**science**

how much gravitational potential energy does the pile driver have when it is lifted to a height of 15m? show work please

*January 7, 2013*

**biology**

1) Reproduce 2) Tumors

*January 7, 2013*

**RED SCARF GIRL**

Did anyone read red scarf girl???If so can you please tell me at least 3 traditions they had in the book

*January 6, 2013*

**Cultural Anthropology 101**

you answers seem to be correct but your number +2B {is shaman} +4A {is states} and hope this helps along with what Ms.Sue has told you.

*January 4, 2013*

**ASAP help CHEMISTRY**

P t = P a + P b + P c + so that being said.... P total = P C3H6 + P O2 = 330 mm Hg + 760 mm Hg = 1090 mm Hg From there on i think you can figure it out. Its a fun problem. My chem teacher gave one like it to our class....

*December 19, 2012*

**Adv calculus **

1. What is the maximum integer n such that 3^n is a factor of the product of all the odd inegers between 1 and 200?

*December 19, 2012*

**SS8R - help!!!**

My teacher told us it was the Sherman Antitrust Act of 1890 and the Federal Trade Commission Act of 1914 and theWheeler-Lea Act of 1938.. we were told that it was 3 acts that were created.

*December 19, 2012*

**Adv Calculus**

THANK YOU SOOOOOOOOOOOOOO MUCH!~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

*December 19, 2012*

**Adv Calculus**

Integrate the following indefinite integral: (sin7x)^12 * (cos7x)^3 Hint: sin^2 + cos^2 = 1

*December 19, 2012*

**Adv Chem 12th grade**

ThaNK YOU SO MUCH!!!!! I really needed anytype of help with this problem...

*December 19, 2012*

**Adv Chem 12th grade**

4. Given the chemical formulas of the following compounds, name each compound and state the rules you used to determine each name. • RbF • CuO • (NH4)2C2O4 (Note: C2O4– is called oxalate.)

*December 19, 2012*