Friday

January 30, 2015

January 30, 2015

Total # Posts: 77

**pre-calculus**

6cos^2(x)-5cos(x)-6
*December 4, 2014*

**Math**

Set up and solve a system of equations to solve the application. A rectangular area of 525 square feet is enclosed using 100 feet of fence. What are the dimensions?
*December 1, 2014*

**Physics**

A student is swinging a 9 kg ball in a circular path in the vertical plane. Consider the instant when the string is horizontal as the ball is on its way up as shown in the figure. At this instant, the instantaneous tangential speed is 6 m/s, and the radius is 6 m. What is the ...
*October 12, 2014*

**Math**

The school band is comprised of middle school students and high school students, but it always has the same maximum capacity. Last year the ratio of the number of middle school students to the number of high school students was 1:8. However, this year the ratio of the number ...
*September 3, 2014*

**Chemistry**

What is the osmotic pressure of a solution made from dissolving 60.0g of glucose, C6H12O6, in 450 mL of water at 10.0∘C?
*September 2, 2014*

**Math**

What about the grandfathers age??
*October 23, 2013*

**Math**

Ace's grandfather is 3 years older than Ace's grandmother. Their combined age is 121 years. How old is each?
*October 23, 2013*

**Math**

A girl is three years older than her brother. If their combined age is 35 years, how old is each?
*October 22, 2013*

**Science**

A metal object with a mass of 19g is heated to 96 degrees celcius, then transfered to a calorimeter containing 75 g of water at 18 degrees celcius. The water and metal object reach a final temperature of 22 degrees celcius. What is the specific heat of this metal object?
*September 24, 2013*

**Chemistry**

a 20.0ml sample of HCL solution is placed in a flask with a few drops of indicator. If 30.0ml of a 0.240 M NaOH solution is needed to reach the endpoint, what is the molarity of the HCL solution?
*April 15, 2013*

**English**

intensive for #20
*March 19, 2013*

**Chemistry I**

Determine the hydronium ion concentration in a solution that is 0.00018 M Ca(OH)2. Answer in units of M
*March 11, 2013*

**5th Grade Math**

dont know dont understand
*January 22, 2013*

**english**

his expression showed how highly he valued his own opinions and scored the view of the others. smug?
*December 4, 2012*

**statistics**

The first sample had 49 subjects and 7 had blue eyes. The second sample had 465 subjects and 244 of these had blue eyes. What is the value of the pooled estimate of the proportion used to test the hypothesis that the population proportions of blue eyes are equal?
*June 26, 2012*

**Chemistry**

thanks
*May 29, 2012*

**Chemistry**

Express the concentration of a 2.0 M NaOH solution as a mass/volume percent. Can you please explain how to get the answer?
*May 29, 2012*

**Chemistry**

What volume of water should be added to 500 mL of a 1.0 mol/L CuSO4 solution to dilute it to 0.5 mol/L?
*May 29, 2012*

**Chemistry**

How did you get that answer?
*May 29, 2012*

**Chemistry**

Express the concentration of a 2.0 M NaOH solution as a mass/volume percent.
*May 29, 2012*

**chemistry**

You're welcome (:
*May 29, 2012*

**chemistry**

B. seawater
*May 29, 2012*

**algebra**

what does the star mean
*April 9, 2012*

**Math 1330**

In a survey of 1000 eligible voters selected at random, it was found that 200 had a college degree. Additionally, it was found that 90% of those who had a college degree voted in the last presidential election, whereas 47% of the people who did not have a college degree voted ...
*April 9, 2012*

**Statistics**

If the correlation coefficient is 0.790, what is the explained variation? A. 37.6% B. 62.4% C. 79% D. 21%
*December 11, 2011*

**Math**

A Norman window has the shape of a rectangle surmounted by a semicircle. (Thus the diameter of the semicircle is equal to the width of the rectangle.) If the perimeter of the window is 24 ft, find the value of x so that the greatest possible amount of light is admitted.
*November 14, 2011*

**Organic Chemistry**

Hello everyone. I have a question that I am having difficulty answering. I can not figure out the synthesis of MELPHALAN, a cancer fighting drug. If anyone has a clue, please help! Thanks, Ashleigh
*November 12, 2011*

**Chem-organic, bio, intro**

A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmhg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure in Torr of the Nitrogen added? Steps for solving this problem are greatly ...
*October 16, 2011*

**Math**

I'm helping my daughter with Algebra homework and I've forgotten how to solve the following. x/2-12 = -3 + x Can someone help
*October 13, 2011*

**science**

What are three methods scientists use to form scientific explainations ?
*October 11, 2011*

**Science**

Another name for your windpipe would be the trachea
*October 11, 2011*

**world history**

1. A.
*February 11, 2011*

**Phys**

Ok...this is a super dumb question, but is an electric field best described as fact, hypothesis, theory or all of these? I think that it is fact, since there are means of measuring the electric field of something, but I could be wrong. They have found fossils of our ancestors...
*February 5, 2011*

**economics**

according to the law of demand,when the price of an item goes up,the quality demanded?
*January 12, 2011*

**Chemistry**

112 grams
*December 18, 2010*

**Chemistry**

The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is 216 kPa, and the gas has a mass of 96.0 g. What is the molar mass of the gas?
*December 15, 2010*

**physics**

An unclothed student is in a 27 degree Celsius room. If the skin temperature of the student is 37 degree Celsius, how much heat is lost from his body in 18 minutes, assuming that the emissivity of the skin is 0.91 and the surface area of the student is 1.7 m^2. The Stephan-...
*November 20, 2010*

**physics**

Thank you!!!
*November 20, 2010*

**physics**

Compressing gases requires work and the resulting energy is usually converted to heat; if this heat does not escape, the gas's temperature will rise. This effect is used in diesel engines: The compressed air gets so hot that when the fuel is injected, it ignites without ...
*November 8, 2010*

**physics!!!**

A copper rod is given a sharp compressional blow at one end. The sound of the blow, traveling through air at -2.79 degrees Celsius, reaches the opposite end of the rod 9.39ms later than the sound transmitted through the rod. What is the length of the rod? The speed of sound in...
*November 8, 2010*

**physics**

The motion of a certain simple harmonic oscillator is described by: x(t) = (12 cm) sin [(1 s ^(-1)) t] What is the earliest time t > 0 or t = 0 at which the oscillator's velocity is zero?
*November 1, 2010*

**physics**

I get 9.00621 x 10 ^-11 m^2/s but the computer says that is wrong. I used the equation, Diffusion rate = DA (concentration gradient) where A is area and D is what we are looking for.
*November 1, 2010*

**physics**

Glycerin in water diffuses along a horizontal column that has a cross-sectional area of 2.3cm^2. The concentration gradient is 0.028 kg/m^4, and the diffusion rate is found to be 5.8 x 10 ^-15 kg/s find the diffusion coefficient in units of m^2/s.
*November 1, 2010*

**physics**

Perfect! Since the density of lead is 11.3 x 10^3 kg/m^3 and the density of mercury is 13.6 x 10^3 kg/m^3, the answer is 0.831. Thanks much!
*October 30, 2010*

**physics**

a lead bullet is placed in a pool of mercury. what fractional part of the volume of the bullet is submerged?
*October 30, 2010*

**physics**

Much easier than I thought: Pressure = (1010 kg/m^3) x (1.51 m) x (9.8 m/s^2) = 14,945.98 Pa Thanks!
*October 26, 2010*

**physics**

Blood of density 1010kg/m^3 that is to be administered to a patient is raised about 1.51 m higher than the level of the patient's arm. How much greater is the pressure of the blood than it would be if the container were at the same level of the arm? The acceleration of ...
*October 26, 2010*

**physics**

I figured this question out: F = (mass of the arm x change in velocity)/time So, ((0.701kg.)(4.78m/s-1.55m/s))/(0.00239s) = 947.376569 And shear stress is F/Area = (947.376569N)/((0.0635m)(0.0131m))
*October 26, 2010*

**physics**

Estimate the force with which a karate master strikes a board if the hand's speed at time of impact is 4.78m/s, decreasing to 1.55m/s during a constant time of 0.00239 s with the board. The mass of coordinated hand and arm is 0.701 kg. Answer in units of N. Estimate the ...
*October 26, 2010*

**6th grade**

Oh I am sorry! I wasn't focusing and kept putting complex! Thank you, Ms. Sue for all your help!
*September 21, 2010*

**6th grade**

Simple and complex subject I mean! Sorry! ^_^
*September 21, 2010*

**6th grade**

What is the simple and complex for this sentence. Making a bad grade on such an easy spelling test is such an embarrassment.
*September 21, 2010*

**Science**

How is the air motion in the eye of a hurricane similar to the air motion at a high pressure center?
*September 18, 2010*

**math**

The price of an antibiotic decreased from $86.25 to $52.75 for a bottle of 100 tablets. Find the ratio of the decrease in price to the original price.
*June 28, 2010*

**resume (education)**

I have to make a resume and my teacher wants us to include any professional memberships. Does honor society (in college) count? If not, please include some examples of professional memberships. Thank you!
*May 10, 2010*

**Geography**

How does modern technology help geographers?
*January 13, 2010*

**math**

What is the improper fraction 61/7 written as a mixed number ?
*December 29, 2009*

**MATH...somewhat urgent**

2x+4y+1=0 y= 2-1/3x y-2x+2=0 3y-9x-1=0
*November 22, 2009*

**math**

THE HUMAN CANNONBALL - AGAIN! (2 pts) On July 23, 1997, Washington County, in Oregon was advertising their Fair & Rodeo special attraction on the Internet: "As the countdown begins, David Smith, Jr. - THE BULLET - puts on his safety helmet, slides down the slender barrel ...
*November 9, 2009*

**Physics**

So it'd be C?
*November 4, 2009*

**Physics**

If the change in position Dx is related to velocity v (with units of m/s) in the equation Dx = Av, the constant A has which dimension? a. m/s^2 b. m c. s d. m^2 I chose b?
*November 4, 2009*

**Social Studies**

describe two ways some caribbean families preserve their cultural traditions
*October 20, 2009*

**Math**

I need help please ASAP
*September 24, 2009*

**Math**

A census-taker rings Mr. Manning's bell and asks how many children he has. "Three daughters," he replies. "And how old are they, in whole numbers?" asks the census-taker. "Well, I'll tell you this:the product of their ages is 72, and the sum of...
*September 24, 2009*

**physical education**

famous dancers or dances in relation to hip hop.
*April 23, 2009*

**art**

for my homework assignment i have a picture of Michaelangelo , creation of Adam painting i have to describe what i think is happening in the painting and also write a story about the painting . Ive described the painting but i am struggling with the story part do i write it as...
*January 2, 2009*

**Chemistry**

How much heat is required to vaporize 1.00 L of CCl4 at its normal boiling point? The following data are given for CCl4. Normal melting point, -23 degree celcius , normal boiling point, 77 degree celcius density of liquid 1.59 g/mL; ; enthalpy of fusion 3.28 kJ/mol vapor ...
*December 8, 2008*

**4th grade science**

My science homework questions is: You measure the boiling temperature of 3 clear liquids. 1 of them boils at 100C. The other 2 at 85C and 115C. How can you use numbers to identify the first liquid? Can someone help?
*September 30, 2008*

**science**

My science homework questions is: You measure the boiling temperature of 3 clear liquids. 1 of them boils at 100C. The other 2 at 85C and 115C. How can you use numbers to identify the first liquid? Can someone help?
*September 30, 2008*

**Math B**

Can some one please explain the set of real numbers as a field to me?
*September 6, 2008*

**applied physics**

if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced
*May 27, 2008*

**English**

I need help to unscramble this word MEFHSKAIT
*February 14, 2008*

**physical science**

How far can a person run in 15 minutes if they run at an average speed of 16km/hr?
*January 24, 2008*

**science**

How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 700. mL of 1.294-M solution of NH3 in order to prepare a pH = 9.70 buffer? (pka of NH3 = 9.25)
*November 2, 2007*

**geography**

i dont understand what an ethinic group is????
*August 29, 2007*

**science**

How does osmosis explain the fact that a watery syrup forms when you put sugar on strawberries? I searched Google under the key words "osmosis" to get these possible sources: (Broken Link Removed) http://en.wikipedia.org/wiki/Osmosis I hope this helps. Thanks for ...
*January 12, 2007*

**the big idea of energy**

i dont know either and i have to include it in a level assessed task help me!!! i have to explain the iron and sulphur reaction using the Big Idea Of Energy.. Help me !!!
*December 5, 2006*

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