Thursday
December 18, 2014

Posts by Anne


Total # Posts: 620

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

CHEMISTRY PLEASE HELP
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

Chemistry - please help-thanks
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

Chemistry-Bob please help-Thanks
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

Chemistry-Bob please help
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

Chemistry-please help
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 0.5min. If I ...
October 14, 2011

Chemistry
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 0.5min. If I use a 4.6 x 100mm x 2.7um column, will the relative ...
October 14, 2011

Pre-Calculus
Could someone help me with this-we learned this today in school but I'm not getting it now that I'm home with my homework-I have lots of these to do can someone help with this one and then maybe it'll click-thank you Find (sqrt3/2 -1/2i)^4 by using DeMoivre's ...
October 10, 2011

Algebra
2 pumps can fill a water tank in 45 minutes when working together. Alone, the second pump takes 3 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank? Show all work
October 9, 2011

Math
Zachary saved x nickels and y dimes last month. Lily saved x nickels and 2y dimes. Lily saved $2 more than Zachary and the total number of her dimes is 4 times the total number of her nickels. (a) How much coins does Zachary have? (b) How much did Lily save? (c) How much did ...
October 6, 2011

US government
What is the freedom from prior restraint?
October 2, 2011

Finance
A state's lottery winner is promised $200,000 a year for 3 years(starting at the end of the first year). Interes rate is annually 7 percent on its fund. How much is the present value of this lottery?
September 29, 2011

trig
Cos(2x+30)-Sin(3x-20)
September 28, 2011

math
Zachary saved x nickels and y dimes last month. Lily saved x nickels and 2y dimes. Lily saved $2 more than Zachary and the total number of her dimes is 4 times the total number of her nickels. (a) How much coins does Zachary have? (b) How much did Lily save? (c) How much did ...
September 22, 2011

physics
A woman rides a carnival Ferris wheel at radius 16 m, completing 4.2 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?
September 19, 2011

English
with people
September 12, 2011

English
What are the ways of getting acquainted?
September 12, 2011

french
What would I use before etait in this statement ?"Nous avons beaucoup aime notre sejour en France . ..... etait splendide."
September 11, 2011

environmental science
what are the environmental parameters of intertidal zone?
August 22, 2011

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 ...
July 23, 2011

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?
July 21, 2011

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.
July 7, 2011

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)
July 6, 2011

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...
June 14, 2011

algebra
12(x-6)=2(x-9) x equals?
June 11, 2011

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. ...
May 28, 2011

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...
May 18, 2011

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?
May 18, 2011

Physics
can u explain it in another way
May 17, 2011

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 ...
May 17, 2011

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?
May 17, 2011

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

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

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | Next>>

Search
Members