Wednesday

July 1, 2015

July 1, 2015

Total # Posts: 673

**Physics**

A 18 kg child slides down a 4.0 m-high playground slide. She starts from rest, and her speed at the bottom is 2.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?
*May 14, 2011*

**physics**

A ball is thrown vertically upward with a speed of +12.0 m/s. How long does the ball take to hit the ground after it reaches its highest point? What is its velocity when it returns to the level from which it started?
*May 14, 2011*

**biology**

can alcohol go through a visking tubing?
*May 12, 2011*

**math**

At Andrews sweet shop almond fudge costs $5.23 per pound, and vanilla fudge costs $4.17 per pound. Allison buys 0.75 pound of almond fudge and 1.25 pounds of vanilla fudge. About how much will Allison pay altogether (excluding tax)?
*April 19, 2011*

**Chemistry-atoms**

A. How many protons are in one atom of fluorine - 19? B. How many neutrons are in one atom of potassium - 39? C. How many electrons are in one neutral atom of V - 51? D. What is the symbol for the element that has 78 protons? E. What is the symbol for the neutral atom that has...
*April 14, 2011*

**Physics**

How do I find Period T(s) and Period^2 T^2 (s^2), given mass(kg) = 0.1 and Average time for ten vibrations (s) = 5.05?
*April 12, 2011*

**physics**

At what distance (in m) from a 3.8 mC charge is the electric potential equal to 32 V? (k = 9 x 109 Nm2/C2)
*March 22, 2011*

**Psycology**

Psychology and Health Problems Paper
*March 17, 2011*

**statistics**

A population is normally distributed with a mean of 40 and a standard deviation of 6. For samples of size 10, what is the probability that the sample mean will be more than 42?
*March 17, 2011*

**medical coding**

What OB/GYN subspecialties specializes in the use of a hysteroscopy?
*March 14, 2011*

**computer science**

Opera Mobile is an example of: a smartphone. a wireless ISP. SmartMedia. a microbrowser.
*March 1, 2011*

**Physics**

2 trains with 132Hz horns approach one another. The slower train has a speed of 25m/s. what is the speed of the fast train if an observer standing near the tracks between the trains hears a beat frequency of 5.2 Hz?
*February 28, 2011*

**math**

give exact and approximate solutions to three decimal places y^2-12y+36=4
*February 27, 2011*

**Organic Chemistry **

Starch
*February 20, 2011*

**Organic Chemistry **

What is the substrate of the enzyme amylase?
*February 20, 2011*

**Chemistry **

Write the reversible equation for the esterification and hydrolysis of glyceryl ethanoate
*February 7, 2011*

**Math**

I need to find the inverse function of f(x)=sqrt(x^2+2x), where x>o This is as far as I got: x=sqrt(y^2+2y) How in the world am I going to isolate for y? Should I complete the square underneath the square root symbol, and then use the quadratic equation? Does that work? :/
*January 25, 2011*

**History **

thankkkyouuu :D
*January 18, 2011*

**History **

Any info about Liberals and conservatives? (mexico history)
*January 18, 2011*

**chemistry**

If an alcohol solution has a pH of 5 would it be a primary, secondary or tertiary alcohol or a phenol?
*January 18, 2011*

**Math**

Use a ruler to create a 6" x 8" rectangle. Cut rectangle on a diagonal. Use the two triangles to create four new shapes. List the most specific shape and its perimeter
*January 13, 2011*

**math**

49<squareroot of 52<64 true or false
*January 10, 2011*

**math**

49<squareroot of 52<64 true or false
*January 10, 2011*

**business math**

A store buys 30 gallons of milk at $1.58 per gallon. To achieve a 20% markup based on cost, what should be the selling price per gallon rounded to the nearest cent?
*January 6, 2011*

**Physics**

A 11 kg object and a 19 kg object are connected by a massless compressed spring and rest on a frictionless table. After the spring is released, the object with the smaller mass has a velocity of 12 m/s to the left. What is the velocity of the object with the larger mass?
*January 4, 2011*

**11th grade**

4. The use of technology such as telephones and computers means that money exchanges and other financial transactions can be a. based on the U.S. dollar all over the world. b. converted to prices in any currency. c. made instantaneously. d.sensitive to variations in any ...
*December 21, 2010*

**Math**

Find the slope of the secant line on f joining the points at x = e and x = 2e.
*December 18, 2010*

**Chemistry**

I'm working on this same problem I'm right there with you until the last step where you have Mass Water x 2257.56 = 34752.8 Can you explain to me where the 2257.56 comes from? THANKS!
*December 11, 2010*

**math**

latoya has 3/4 of a bag of popcorn. If she eats half of the popcorn at the movie, how much does she have left?
*December 9, 2010*

**Math question**

I don't understand how to find the aproximate area of a shaded region This problem has a big cirlce with 1/4 shadded with a radius of 20 cm. the answer chocies are A. 90 cm squared B. 270 cm squared C. 314 cm squared D. 1.256 cm squared how do I find the answer?
*December 7, 2010*

**chemistry**

A compound,KBrOx, is analyzed and found to contain 52.92% Br by mass. What is the value of x?
*December 6, 2010*

**Science**

If India had a population of 1.05 billion in 2002 with a steady growth rate of .9%, when would its population reach 4.2 billion?
*December 5, 2010*

**Finance**

A non-profit hospital's asset definition is >$1500, but they want to buy 10 chairs at $200 each - for a total purchase price of $2000. The useful life of the chairs would be 15 yrs, per AHA guidelines. Can this purchase be capitalized & depreciated over the life or must...
*December 3, 2010*

**Chemistry **

If you add acid or base to a buffer, how will the pH change.
*December 1, 2010*

**math**

a cold front moves in at noon and in 5 hours, the temperature had dropped 23%. the temperature at 5:00 p.m. was 14%. let x be the temperature at noon. write an equation to find x.
*November 30, 2010*

**chemistry**

This question has three paarts: 1. Determine the mass of water formed when 14.5L NH3 (at 298K and 1.5 atm) is reacted with 19.3 L of O2 (at 321K and 1.2 atm) 4NH3+O2-->4NO+6H2O I got the answer of 19 g H2O 2.What are the partial pressures for all gases that remain at the ...
*November 20, 2010*

**chemistry**

What are the partial pressures for all gases in 4NH3+O2-->4NO+6H2O that remained at the end, if the reaction took place in a sealed 50.0L tank and the final temperature is 345K?
*November 20, 2010*

**URGENT! Temperature Conversion problem help!**

never mind problem resolved
*November 15, 2010*

**Physics**

the only force acting on the rocket in the time its in the air is gravity. so the force acting against it (the force that propels it) is the force coming out of the rocket's exhaust which is greater than gravity.
*November 14, 2010*

**Chemistry**

Consider the combustion of propane (C3H8) in the presence of oxygen: C3H8+5O2 => 3CO2+4H2O How many grams of O2 are required to react completely with 3 moles of propane?
*November 11, 2010*

**Physics**

I mean it's horizontal velocity.
*November 10, 2010*

**Physics**

Since it's Okm/h, if the pencil is relased on the road will it still be Okm/h? Thanks
*November 10, 2010*

**Physics**

Suppose you are standing in the aisle of a bus traveling along a straight road at 100km/h, and you hold a pencil still above your head. Then relative to the bus, the velocity of the pencil is 0km/h, and relative to the road, the pencil has a horizontal velocity of? a. less ...
*November 10, 2010*

**Physics**

As you approach the I-90 exit in your uncle's little red sports car convertible, you happen to notice a cat crossing the road. Not that you have any particular love of cats (especially this one, whose snooty disposition seems to beckon for a game of chicken), but you ...
*November 1, 2010*

**Chemistry**

find the reaction quotient: partial pressures are: p of N2=.903, P of H2=.888, P of NH3=.025
*October 31, 2010*

**Chemistry**

find the reaction quotient: partial pressures are: p of N2=.903, P of H2=.888, P of NH3=.025
*October 31, 2010*

**physics.**

Sound with a frequency of 261.6Hz travels through water at a speed of 1435m/s.
*October 25, 2010*

**geography**

how thick is the bedrock in the inetrior plains and why is it so thick
*October 24, 2010*

**college**

When I was considering what to do with my $10,000 Lottery winnings, my broker suggested I invest half of it in gold, the value of which was growing by 12% per year, and the other half in CDs, which were yielding 5% per year, compounded every 6 months. Assuming that these rates...
*October 20, 2010*

**Math 1320**

When I was considering what to do with my $10,000 Lottery winnings, my broker suggested I invest half of it in gold, the value of which was growing by 12% per year, and the other half in CDs, which were yielding 5% per year, compounded every 6 months. Assuming that these rates...
*October 20, 2010*

**physics**

My answer for this question A 11.0 kg box is released on a 37 degreesincline and accelerates down the incline at 0.25 m/s^2. What is the coefficient of kinetic friction? My answer was 68.2 and it was incorrect.
*October 15, 2010*

**physics**

For the question about friction force impeding motion. I'm sorry I tried what you wrote and did not get the correct answer. Its' not your fault. I am doing university phys and have never taken it before. I am little confused about what to do. Could you put it in steps...
*October 15, 2010*

**physics**

Part C Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21 degrees. If the edge of the roof is 11.0 above ground, what is the speed of the snow when it hits the ground?
*October 15, 2010*

**physics**

Part B Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21. As the snow begins to melt, the coefficient of static friction decreases and the snow eventually slips. Assuming that the ...
*October 15, 2010*

**physics**

Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21. What is the minimum value of the coefficient of static friction that will keep the snow from sliding down in units uK?
*October 15, 2010*

**physics**

A 11.0 box is released on a 37 incline and accelerates down the incline at 0.25 .What is the coefficient of kinetic friction in units uk? What is the friction force impeding its motion in N?
*October 15, 2010*

**physics**

I worked it through and checked it didn't make sense to me. But I have to finish the assignment soon so I put the answer in anyway. Thanks for you patience.
*October 15, 2010*

**physics**

For my question about the carton's speed must I do each step you laid out or just the last one? I got the wrong answer. Thanks for your help.
*October 15, 2010*

**physics**

A carton lies on a plane tilted at an angle theta 29 degrees to the horizontal, with a friction of uk .12.If the carton starts from rest 7.90 up the plane from its base, what will be the carton's speed when it reaches the bottom of the incline?
*October 15, 2010*

**physics**

A flatbed truck is carrying a heavy crate. The coefficient of static friction between the crate and the bed of the truck is 0.66.What is the maximum rate at which the driver can decelerate and still avoid having the crate slide against the cab of the truck?
*October 15, 2010*

**physics**

A 11.0 box is released on a 37 incline and accelerates down the incline at 0.25 .What is the coefficient of kinetic friction?
*October 15, 2010*

**science**

i need to define variable, independent variable, control and control group. HELP!
*October 7, 2010*

**geometry**

The perimeter of a quadrilateral is 56. The lengths of three consecutive sides are 9, 13, and 16. What is the length of the fourth side?
*October 1, 2010*

**math**

The perimeter of a quadrilateral is 56. The lengths of three consecutive sides are 9, 13, and 16. What is the length of the fourth side?
*October 1, 2010*

**Math-New Geometry**

Choose the correct property illustrated by the following statement: If 3m¡ÐZ = 90¨¬, then m¡ÐZ = 30¨¬ Please help know its either division property or reflexive property...im not sure wich though..if any one knoes its very appreciated thxx
*September 29, 2010*

**2nd grade**

How would you explain this to a teacher that says the first one is correct?
*September 28, 2010*

**2nd grade**

Please tell me which sentence is correct. Adrian chose him and I for the job. *Adrian chose him and me for the job.
*September 28, 2010*

**Chemistry -help**

To determine the sodium carbonate content & total alkali in NaOH, the following steps were performed:- 1) 2.0g of NaOH was dissolved in 80ml of CO2 free water. 2) 3 drops of phenolphthalein indicator were added and the solution was titrated with 1M HCl. Colour changed from ...
*September 18, 2010*

**Chemistry- Dr Bob please help **

Thanks Dr Bob,the purpose of this experiment is to test for the clarity of my sodium hydroxide sample. I intend to boil deionized water to get CO2 free water, cool the water and add it to a 100mL volumetric flask containing 10g of solid NaOH. Would that be alright? Also, can ...
*September 18, 2010*

**Chemistry- please help**

Thanks, can you then explain the exact steps (including the apparatus to use) so that the procedure can be followed? Thanks a lot:)
*September 18, 2010*

**Chemistry- please help**

I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this test. Do I boil 100ml of deionized water and ...
*September 18, 2010*

**Chemistry**

I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this test. Do I boil 100ml of deionized water and ...
*September 18, 2010*

**college**

A thirteen-year-old girl, who is underdeveloped and thin, has a blood disorder. She frequently experiences chest and abdominal pain, fever, and coughing, and has trouble breathing. Her teachers often spend additional time with her, explaining concepts that the rest of the ...
*August 25, 2010*

**Math**

a 25.00 gram sample is placed in a graduated cylinder and then the cylinder is filled to the 50.0 mL mark with benzene. the mass of benzene and solid together is 58.80 gram. assuming that the solid is insoluble in benzene and that the density of benzene is .880 g/cm^3 , ...
*August 23, 2010*

**math**

32 is 40% of what number?
*August 11, 2010*

**Science**

Thank you So much! This was a HUGE help!!!
*July 26, 2010*

**Science**

Can someone please give me a SIMPLE definition of metabolism. I've seached tons of dictionaries, but they all give a long and confusing definition and I'm not sure if I understand the concept.. Please help!!
*July 26, 2010*

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -5t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in meters/sec and “k” is the initial height in meters...
*June 15, 2010*

**Math**

Which of the following is an example of a ratio? number of dogs who like Good boy treats number of chocalates per bag number of people who like math all of the above Please help
*May 25, 2010*

**management**

Think of a recently completed group project that you have been involved in. This project may have been a student project, a group project, or an extracurricular project. Briefly describe the situation and choose one of the following to post on the discussion board: Analyze how...
*May 23, 2010*

**geometry**

a pallelagram?
*May 20, 2010*

**Chemistry**

Is 20.0 mL of 1.0M CH3COOH and 10.0mL of 1.0 M NaOH a buffer solution of 3?
*May 4, 2010*

**floral designing**

what kind of container do you need for a Hogarth arrangement?
*April 23, 2010*

**math **

a jar contain 8 blue blocks 4 red ,9 orange and 4 green ones. About what fraction of the time would you expect to pull out a blue block?
*April 19, 2010*

**math (advanced alg and trig)**

Solve to the nearest minute: x is greater than or equal to 0 and less than 360. 3sec^2 x-8tan-6=cotx
*March 28, 2010*

**trig**

Prove that tan4x=(4tanx-tan^3x)/(1-6tan^2 x+tan^4 x) *note: the exponents are just numbers. there are no variables in the exponents.
*March 27, 2010*

**Chemistry**

You have to make sure that each ELEMENT has the same number of atoms on each side of the equation. so treat polyatomics like they are separate elements. if you have say, SO4 on one side, you have to make sure that there are 4 oxygen atoms and one sulfur atom on the other side ...
*March 27, 2010*

**math**

first solve each like they have an equal sign: 4>-2x+3 -3 -3 1>-2x -1/2<x (when you divide by a negative # in an inequality, you change a less than to a greater than or visa-versa) 12<-2x+5 -5 -5 7<-2x -7/2>x (same thing) hope that helped
*March 27, 2010*

**Math**

the formula for midrange is M=(maxX-minX)/2 (i think) so it'd be M= (28-6)/2 M=(22)/2 M=11
*March 27, 2010*

**college chemistry - answer check ASAP!**

The corrosion of iron can be thought of as an electrochemical cell reaction. Calculate the voltage difference between two points of corroding iron differing only in their partial pressures of oxygen: 0.20 atm of oxygen at one point and 0.0010 atm of oxygen at the other. The ...
*March 13, 2010*

**estimating**

A security analyst specializing in the stocks of the motion picture industry the relation between the number of movie theater tickets sold in December and the annual level of earnings in the motion picture industry. Time-series data for the last 15 years are used to estimate ...
*March 11, 2010*

**chemistry**

Give the cell diagram notation of the electrochemical cell that could be used to determine experimentally the dissociation constant (Kw) of water. The standard reduction potential for: O2 + 2H20 + 4e- ---------> 4 OH- 0.40 V
*March 9, 2010*

**Science**

Homw many grams of copper sulfate pentahydrate (CuSo4 5H2O) would you heat to produce 29.8 g of water?
*March 9, 2010*

**KEYBOARDING AND WORD PROCESSING**

Which of the following is correctly capatalized? (a Sincerely Yours (b Anatomy And Physiology (c Dear Mr. Welby (d Ladies and gentlemen
*March 6, 2010*

**Statistics**

There are 100 marbles in a bag. 200people are asked to draw a ball. Each marble drawn is put back into the bag before the next draw. 7 people draw red color marbles. How many red marbles are there in the bag?
*March 4, 2010*

**math**

how would u factor ab (to the 2nd power) - b
*February 21, 2010*

**CALCULUS**

If 6 J of work are needed to stretch a spring from 12 cm to 13 cm and 10 J are needed to stretch it from 13 cm to 14 cm, what is the natural length L of the spring?
*February 21, 2010*

**CALCULUS**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the y-axis. Y = 3/X, Y = 0, X =5, X = 2
*February 18, 2010*

**marketing**

If you are using the Internet and Web resources for a business publication, under which conditions is it not necessary to include a citation?
*February 12, 2010*

**English**

What's a good TITLE for a play about a girl who acts so depressed because of a mothers death and a friend who helps her out in the end realize she can move on??!! Please I'm stuck, I want something creative! Any ideas??!!
*February 3, 2010*