Friday
April 18, 2014

Posts by Anne


Total # Posts: 584

Chemistry
I have 2 chemicals, A & B. Note: both do not contain buffer salts. Chemical A expires 1 week later. Chemical B expires next year. I prepare solution C (general laboratory reagent)containing Chemicals A & B. When assigning the expiry date of solution C, does this mean the expir...

CHEMISTRY
Discuss in detail the healthcare applications of chemical reactions. Which chemical reactions would you consider to be of importance to healthcare professionals? Why? In which situations are these chemical reactions useful to healthcare professionals?

Physics
He meant 'Physics' as the subject instead of 'Tamucc', which stands for Texas A&M University - Corpus Christi. He must be taking the summer physics class at TAMUCC.

maths
1)Please check that you entered this answer correctly, as it is written now I'm not convinced it can be factored. 2)6x^2+5x-4=0 (3x+4)(2x-1) 3)x^2=3x x^2-3x=0 x(x-3) 4)x(x-3)=-2 x^2-3x=-2 x^2-3x+2 (x-2)(x-1) 5)4x^2+11x+6 (4x+3)(x+2)

Calculus
A car passes by a certain point at t = 0 hours heading east at 40 miles/hour. At t = 1 hour, another car passes by the same point heading north at 50 miles/hour. Which of the following functions equals the distance L (in miles) between the two cars as a function of t, for t is...

algebra
12(x-6)=2(x-9) x equals?

math
Sunae's group of close friends are going to fifth grade in September. All are going to Belleview Elementary and their homerooms will be rooms 12, 14, or 16. All of her friends but 4 are going to room 12, all but 4 are going to room 14, and all but 4 are going to room 16. N...

Physics
The helicopter view in the figure below shows two people pulling on a stubborn mule. Assume that F1 is 130 N, and F2 is 65 N. The forces are measured in units of newtons (N). (a) Find the single force that is equivalent to the two forces shown. In both magnitude and direction....

Physics
An astronaut takes a space trip to newly discovered palnet X. measurements from earth indicate that: Mx=3Me and Rx=2Re. What is the acceleration of gracity gx on this planet as a multiple of ge?

Physics
can u explain it in another way

Physics
Suppose the stone is thrown at an angle of 32.0° below the horizontal from the same building (h = 49.0 m) as in the example above. If it strikes the ground 69.3 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to eliminate v0t from t...

Physics
In a physics lab experiment, a spring clamped to the table shoots a 18 g ball horizontally. When the spring is compressed 20 cm, the ball travels horizontally 4.9 m and lands on the floor 1.3 m below the point at which it left the spring. What is the spring constant?

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?

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?

biology
can alcohol go through a visking tubing?

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)?

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...

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?

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)

Psycology
Psychology and Health Problems Paper

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?

medical coding
What OB/GYN subspecialties specializes in the use of a hysteroscopy?

computer science
Opera Mobile is an example of: a smartphone. a wireless ISP. SmartMedia. a microbrowser.

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?

math
give exact and approximate solutions to three decimal places y^2-12y+36=4

Organic Chemistry
Starch

Organic Chemistry
What is the substrate of the enzyme amylase?

Chemistry
Write the reversible equation for the esterification and hydrolysis of glyceryl ethanoate

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? :/

History
thankkkyouuu :D

History
Any info about Liberals and conservatives? (mexico history)

chemistry
If an alcohol solution has a pH of 5 would it be a primary, secondary or tertiary alcohol or a phenol?

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

math
49<squareroot of 52<64 true or false

math
49<squareroot of 52<64 true or false

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?

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?

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 curren...

Math
Find the slope of the secant line on f joining the points at x = e and x = 2e.

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!

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?

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?

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

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?

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...

Chemistry
If you add acid or base to a buffer, how will the pH change.

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.

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 en...

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?

URGENT! Temperature Conversion problem help!
never mind problem resolved

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.

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?

Physics
I mean it's horizontal velocity.

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

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 tha...

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 swerv...

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

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

geography
how thick is the bedrock in the inetrior plains and why is it so thick

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...

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...

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.

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...

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?

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 d...

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?

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?

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.

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.

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?

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?

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?

science
i need to define variable, independent variable, control and control group. HELP!

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?

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?

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

2nd grade
How would you explain this to a teacher that says the first one is correct?

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.

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 pin...

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 y...

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:)

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 p...

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 p...

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 clas...

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 , calcul...

math
32 is 40% of what number?

Science
Thank you So much! This was a HUGE help!!!

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!!

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 ...

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

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...

geometry
a pallelagram?

Chemistry
Is 20.0 mL of 1.0M CH3COOH and 10.0mL of 1.0 M NaOH a buffer solution of 3?

floral designing
what kind of container do you need for a Hogarth arrangement?

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?

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

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.

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 ...

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

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

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