Friday
April 29, 2016

# Posts by Anne

Total # Posts: 701

Math
i am a 4 digit number between 3000 and 4000.My ones digit is twice my thousands digit.My hundreds digit is the same as my ones digit and my tens digit is one less than the hundreds digit.If the sum of my digit is twenty,what number am i?
June 5, 2012

GEOMETRY
Length of the diameter of a circle with the endpoints A(4, -3) and B(4, 3)
May 30, 2012

Chemistry
I have liquid concentrated HCl (37%w/w) To prepare 100ml of 10g/L HCl as a solvent medium, is it acceptable to just weigh 1g of liquid conc HCl and dilute to 100ml with water? What volume of conc HCl should we use to make 100ml of 10g/L HCl?
May 28, 2012

writing
Write a journal entry describing a day in the life of a snake in the wild from the snake's point of view. At least 5 sentences
May 17, 2012

English
would "the only heroic thing is the sky" be personification?
May 17, 2012

Math :(
Great answer and great way to explain. I would do the same thing. This is easy for me
April 30, 2012

Accounting
Please prepare the following journal entries. Indicate which account should be debited and which account should be credited along with the dollar amount of the debit and credit. a) Investors invested \$100,000 in exchange for 10,000 shares of common stock. b) Company paid a ...
April 19, 2012

Chemistry
A 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2O4=128.09 g/mol]
April 16, 2012

Chemistry
How would you find the pH of a solution prepared by mixing 50 mL of 0.125 M KOH with o.050 L of 0.125 M HCl?
April 16, 2012

physics 2
A concave mirror has a focal length of 27.0 cm. The distance between an object and its image is 46.5 cm. Find the object and image distances, assuming the following. (a) that the object lies beyond the center of curvature do = di = (b) that the object lies within the focal ...
April 10, 2012

hca/210
examples of position in healthcare for the four functions of management
April 9, 2012

Physics 2
The average intensity of light emerging from a polarizing sheet is 0.807 W/m2, and the average intensity of the horizontally polarized light incident on the sheet is 0.972 W/m2. Determine the angle that the transmission axis of the polarizing sheet makes with the horizontal.
April 5, 2012

math
The average of two numbers is 34. The first number is three times the second number. what are the two numbers?
April 1, 2012

Math
Jillian must average at least 90 on two quiz scores before she can move to the next skill level. Jillian got a 92 on her first quiz. What scores could Jillian get on her second quiz in order to move to the next skill level? How could I answer this is an two-step inequality form?
March 27, 2012

Physics
A 30.0 kg box is being pulled across a carpeted floor by a horizontal force of 230 N., against a friction force of 210 N. Calculate the acceleration of the box and find the x and y components of the acceleration of the box. Align the positive direction with the normal force ...
March 26, 2012

Physics
Thanks! I did get this far, but it didn't seem right!
March 26, 2012

Physics
A loud speaker of mass 24.0 kg is suspended a distance of h = 2.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 3.50 m. What is the tension in each of the cables?
March 26, 2012

Science
What does a thermohygrometer do?
March 25, 2012

Chemistry
How long can we use a bottle containing anti-bumping granules? Can it be used indefinitely?
March 23, 2012

Chemistry
I know that it's made up of one molecule from fructose and one molecule from glucose. i think it has a 12 Carbon atom ring... but that's really all I know
March 22, 2012

Chemistry
Can you label all the functional groups of the Sucrose Molecule?
March 22, 2012

Probability
Six marbles are chosen without replacement from a box containing 10 red, 8 blue, and 3 yellow marbles. Let X be the number of blue marbles chosen. a) Find the probability distribution of X. b) Find the mean of the random variable X
March 22, 2012

Probability
7) Suppose that you roll a pair of standard 6-sided dice a total of 42 times. What is the probability that you will get a sum of 5 at least four times?
March 22, 2012

Chemistry
What is the function of Compressed Air in GC-FID (i.e. Gas Chromatography-Flame Ionization Detector)?
March 18, 2012

Science-Chemistry
In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance in the crucible and ...
March 18, 2012

science
Who would have to overcome inertia to move the ball, a golfer or a soccer player?
March 15, 2012

Chemistry
during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ...
March 3, 2012

physics
A balloon rubbed against denim gains a charge of -9 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5 cm.
March 1, 2012

physics
Two electrostatic point charges of 83 µC and 50 µC exert a repulsive force on each other of 175 N. What is the distance between the two charges?
March 1, 2012

Pre-Cal
Convert the given exponential function to the form indicated. Round all coefficients to four significant digits. f(x) = 9e^3x; f(x) = Ab^x How do i solve the equation with this formula? Thanks
February 29, 2012

math
Solve variation problem if m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7
February 24, 2012

Physics 2
A cylindrical copper cable carries a current of 1170 A. There is a potential difference of 1.60 10-2 V between two points on the cable that are 0.21 m apart. What is the radius of the cable?
February 16, 2012

Physics 2
A(n) 78-Ù resistor and a 68-Ù resistor are connected in series across a battery. The voltage across the 78-Ù resistor is 25 V. What is the voltage across the 68-Ù resistor?
February 16, 2012

potential
What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulumbs and q2= -5 micro coulumbs?
February 16, 2012

electric fields
In an electic field described by E=(20i+60j) V/m, calculate the change in potential for a particle that moves from the origin to the coordinate (3,3) m?
February 16, 2012

Physics
A conducting hollow sphere of radius. 2m and charge 20 micro coulumbs. What is the potential of the sphere at a distance r from the center if: A)r= .1m? b)r= .2m? c) r=.3m?
February 16, 2012

Physics
You've got a conducting hollow sphere of rradius 0.2 m and a charge of 20 micro culumbs. What is the potential of the sphere at distance r from the center if : r=0.1 m? r=0.2 m? r=0.3 m?
February 15, 2012

emily
But v= k int. (Dq/r).....?
February 15, 2012

gender
Women not being allowed into the seals
February 15, 2012

Calculus (Integrals)
Actually none of the above
February 15, 2012

Chemistry-help
Posted by anne on Wednesday, February 15, 2012 at 3:20pm. How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
February 15, 2012

Chemistry
How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
February 15, 2012

Physics 2
The wire in the figure below carries a current of 12 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 30 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r = 0.72 m from...
February 13, 2012

Physics 2
The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the center of the square is 91.5 µT. Calculate the current I.
February 12, 2012

Physics
A horizontal wire of length 0.48 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19° it experiences a magnetic force of 4.00 10-3 N...
February 12, 2012

Chemistry
wats Kf and kb
February 9, 2012

Math
Gymnast Clothing manufactures expensive hockey jerseys for sale to college bookstores in runs of up to 250. Its cost (in dollars) for a run of x hockey jerseys is C(x) = 2500 + 10x + 0.2^x2(0 ≤ x ≤ 250) Gymnast Clothing sells the jerseys at \$105 each. Find the ...
February 9, 2012

Math
The associated exponential model for the value of a deposit after t years is A(t) = 7000(1 + (0.0394/12))^12t. At the start of which year will an investment of \$7,000 made at the beginning of 2007 first exceed \$11,000? (Round your answer the nearest whole number.) I don't ...
February 9, 2012

Physics
A capacitor is constructed of two concentric conducting cylindrical shells. The radius of the inner cylindrical shell is 2.35 10-3 m, and that of the outer shell is 2.49 10-3 m. When the cylinders carry equal and opposite charges of magnitude 1.61 10-10 C, the electric field ...
February 1, 2012

Physics
An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.4 cm, and the electric field within the capacitor has a magnitude of 3.5 106 V/m. What is ...
February 1, 2012

Chemistry - thanks
In a thin layer chromatography (TLC)experiment,the TLC plate was pre-developed in the development chamber containing the mobile phase (to remove any contaminants before use),then air dried. On the same day,the TLC plate was then spotted with the sample & standard and placed in...
January 31, 2012

Chemistry-help needed
I have a question on thin layer chromatography (TLC). My mobile phase (i.e. developing solvent) is a mixture of 2 non-polar solvents. After preparing the mobile phase, is it necessary to pour some into the developing chamber to saturate the chamber or should we only pour the ...
January 31, 2012

Algebra
I have 100 feet to surround three sides of a rectangle. What is the largest area that I can enclose?
January 30, 2012

Physics
Three point charges, -6.35 10-9 C, -8.20 10-9 C, and +7.75 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2210 V. What is the radius of the circle?
January 30, 2012

Physics
The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -7.00 10-9 C placed at corner A and then at corner B.
January 30, 2012

Physics
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
January 24, 2012

Physics
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
January 23, 2012

Physics
Two charges, -15 and +4.5 µC, are fixed in place and separated by 2.8 m. At what spot along a line through the charges is the net electric field zero? What would be the force on a charge of +1 µC placed at this spot?
January 23, 2012

Science
"When Environmental Hazards happen, what should you do?"?
January 20, 2012

Please show me the calculation steps. How do I prepare 10%w/w Hydrochloric acid from 37%w/w Hydrochloric acid? The density of 37%w/w HCl is 1.19g/ml. Thank you.
January 19, 2012

Chemistry
A foundry releases 6.0 U.S. tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO subscript 2) by weight. How many pounds of sulfur dioxide are released in one week? Show all work needed.
January 5, 2012

Chemistry
thanks for the help :)
December 13, 2011

Chemistry
A compound of the element A and oxygen has a mole ratio of A:O=2:3. If 8.0 grams of the oxide contains 2.4 grams of the oxygen, a. What is the atomic weight of A? b. What is the weight of one mole of the oxide? c. What theoretical weight of the oxide is formed when 28 grams ...
December 13, 2011

algebra
how do I solve F = 5/9 (F-32) ?
December 9, 2011

urgent math
sorry i forgot to put the problem. here it is: f(x)=4(x+5)^2-6
December 8, 2011

urgent math
without graphing, find the vertex, the azis of symemtry, and the maximum value or the minium value.
December 8, 2011

urgent math
complete the square to write each function in the form f(x)=a(x-h)^2+k f(x)=2x^2-20x-3
December 8, 2011

urgent math
find the equilibrium point for the demand and supply functions D(p)=79-8p and S(p)=37+6p, where p is the price, in dollars, D(p) is the number of units demanded, and S(p) is the number of units supplied.
December 8, 2011

pre calc
you are 7 miles N & 4 miles W of the cabin how do you get back to the cabin? Bearing?
December 7, 2011

find a quadratic function that fits the set of data points. (1,4), (-1.6), (-2,16) what did i do wrong, i got -2x^2-x+7
December 7, 2011

find all x-intercepts of the given function f. f(x)=3x+10ã(x) -8
December 7, 2011

simplify x^5-x^3+x^2-1-(x^3-1)(x+1)^2/(x^2-1)^2
December 7, 2011

math **urgent**
using 100 ft of fence material and building a regular octagon garden, what is the area of the garden?
December 5, 2011

Physics
A vertical spring with a spring constant of 400 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.7 cm in bringing the block to a momentary...
December 1, 2011

Physics
A simple pendulum is swinging back and forth through a small angle, its motion repeating every 1.08 s. How much longer should the pendulum be made in order to increase its period by 0.31 s?
December 1, 2011

Physics
A 63.0-kg bungee jumper is standing on a tall platform (h0 = 45.8 m). The bungee cord has an unstrained length of L0 = 9.18 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.2 N/m. The jumper falls from rest, and it is assumed that the only ...
November 30, 2011

Physics
A 63.0-kg bungee jumper is standing on a tall platform (h0 = 45.8 m). The bungee cord has an unstrained length of L0 = 9.18 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.2 N/m. The jumper falls from rest, and it is assumed that the only ...
November 30, 2011

Physics
A vertical spring with a spring constant of 400 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.7 cm in bringing the block to a momentary...
November 30, 2011

Physics
A bungee jumper, whose mass is 83 kg, jumps from a tall platform. After reaching his lowest point, he continues to oscillate up and down, reaching the low point two more times in 9.7 s. Ignoring air resistance and assuming that the bungee cord is an ideal spring, determine its...
November 30, 2011

Physics
In 0.780 s, a 6.50-kg block is pulled through a distance of 3.85 m on a frictionless horizontal surface, starting from rest. The block has a constant acceleration and is pulled by means of a horizontal spring that is attached to the block. The spring constant of the spring is ...
November 30, 2011

Literacy
1) A strong search strategy for a search engine would include which of the following? A. Using quotation marks, hyphens, and unique words B. Entering one or two related words C. Using several synonymous terms in the search D. Reading all the hits from your first search answer...
November 29, 2011

math-college URGENT**
in sentence form using one variable and one equation/inequality solve: sue makes \$15/hour tutoring and averages \$10/hour waitressing. Out of 30 hrs working time, what is the minimum # of hours she should tutor if she is to make at least \$475?
November 28, 2011

Physics
Assume that the earth is a uniform sphere and that its path around the sun is circular. a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the United States in one year is about 9.33 109 J. b)...
November 22, 2011

Physics
The drawing shows a model for the motion of the human forearm in throwing a dart. Because of the force applied by the triceps muscle, the forearm can rotate about an axis at the elbow joint. Assume that the forearm has the dimensions shown in the drawing and a moment of ...
November 22, 2011

physics
A thin uniform rod is rotating at an angular velocity of 6.7 rad/s about an axis that is perpendicular to the rod at its center. As the drawing indicates, the rod is hinged at two places, one-quarter of the length from each end. Without the aid of external torques, the rod ...
November 22, 2011

chemistry
A student placed 10 g of Mg(OH)2 into a flask and added 500ml of water. The student took 100 ml of the Mg(OH)2 solution and reacted with HCl(aq). If 13.75 ml of 0.010M HCL reacted with the OH(aq), was was the concentration of hydroxide ion in the 100 ml solution?
November 7, 2011

Physics
A car is being driven along a country road on a dark and rainy night at a speed of 20 m/s. The section of road is horizontal and straight. The driver sees that a tree has fallen and covered the road ahead. Panicking, the driver locks the breaks at a distance of 20m from the ...
November 6, 2011

physics
A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power would be generated?
November 6, 2011

physics
A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power would be generated?
November 6, 2011

physics
While you sleep, your body is using energy at a rate of 77 W. How many food calories are used during an eight hour period? One food calorie is equal to 4186 joules.
November 6, 2011

Precalculus
Complete the following identity secx-1/secx=? I have four multiple choice options and can't seem to work my way to either one. A) secx cscx B)1+cotx C)sinx tanx D)-2tan^2x
October 30, 2011

1) What effect would each of the errors described below have on the concentration of potassium hydrogenphthalate?
October 24, 2011

Physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.80 x 10^11 m apart. The larger of the two stars has a mass of 3.50 x 10^30 kg, and its center is 3.00 x 10^11 m from the system's center of mass. What is the mass of the ...
October 24, 2011

Physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.80 1011 m apart. The larger of the two stars has a mass of 3.50 1030 kg, and its center is 3.00 1011 m from the system's center of mass. What is the mass of the smaller star?
October 24, 2011

Physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.80 1011 m apart. The larger of the two stars has a mass of 3.50 1030 kg, and its center is 3.00 1011 m from the system's center of mass. What is the mass of the smaller star?
October 24, 2011

Posted by anne on Saturday, October 15, 2011 at 1:03am. Hi, Please advise on the following: - A procedure for the determination of Impurities A & B in a compound says to use a 4.6 x 150mm x 3um column (stationary phase: octadecylsilyl silica gel). The relative retention time ...
October 15, 2011

Hi, Please advise on the following: - A procedure for the determination of Impurities A & B in a compound says to use a 4.6 x 150mm x 3um column (stationary phase: octadecylsilyl silica gel). The relative retention time with reference to the Principal Peak is: - 1) about 0.2 ...
October 15, 2011

Posted by anne on Friday, October 14, 2011 at 6:30pm. Hi, I have a question on HPLC (high performance liquid chromatography). The procedure says to use a 4.6 x 150mm x 3um column. The relative retention time of Impurity B with reference to the main peak is about 0.5 (i.e the ...
October 14, 2011

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