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October 1, 2014

Posts by anna


Total # Posts: 1,975

Chemisty
Fluorine gas can react with ammonia gas to produce dinitrogen tetrafluoride gas and hydrogen fluoride gas. This reaction is described by the following balanced equation: 5 F2 (g) + 2 NH3 (g) N2F4 (g) + 6 HF (g) What mass of hydrogen fluoride gas is produced from 135 g of ...
March 8, 2013

Check my physics
Would you mind checking one of my problems from my physics study guide? I know the answer and just want to make sure I am using the right formula. :) A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #8: A 20 kg block of ice slides without friction down a long hill. The start ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #7: A 30 kg ball is launched at an angle of 15 degrees and is moving 20 m/s ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #6: A 30 kg kid on rollerskates is moving 1 m/s. His brother pushes him with a...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #5: A roller coaster car starts at Point A at a height of 100 m. When it ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #4: What is the increase in thermal energy to a 2000 kg bus and its ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #3: A 30 kg kid on rollerskates is being pushed by his mom with a force of 10 ...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #2: Suppose the spring in a pinball machine has a spring contant of k=400 N/m...
March 7, 2013

PHYSICS
Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with these. Here is problem #1: A skier with a mass of 60.0 kg is standing at the top of a snow covered ...
March 7, 2013

Exam: 986109RR - CHOOSING YOUR BUSINESS
Um, the point of this website is not to give out ABCD answers. It's to help guide you. But we can't even help you do that since you posted so many answers. Sorry, can't help.
March 7, 2013

algebra
If the equation were x= 0.03x - 58.91, x would equal -60.7320.
March 7, 2013

algebra
What are you asking?
March 7, 2013

Cultural Anthrolpogy
The field of computer technology could be used to illustrate that culture is
March 6, 2013

Physics
For launching a satellite into orbit around earth, would the proper conservation of energy formula be: Epi + Eki + O work = Epf + Ekf? Would work = 0 for launching a satellite? And, would Epi = -Gm1m2/radius of earth or would it just equal 0 (because we usually set Ep on earth...
February 28, 2013

Chem
Calculate the pH of a .50 M solution of NaCl.
February 27, 2013

Physics
The electric field strength @ distance = 1.0 m from a point charge is 4.0 x 10^4 N/C. What is the Electric field strength @ 2.0 m from the same charge?
February 27, 2013

Physics
Thanks!
February 27, 2013

Physics
On the moon's surface, the force of gravity exerted by the moon on a camera is 2.4 N. What is the force of gravity exerted by the moon on the camera when it is in orbit with a radius = to twice the moon's radius?
February 27, 2013

Maths A
Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 inclusive. o The next ten (10) numbers must lie in the range from 30 to 70 inclusive. o The remaining eight (8) numbers must lie in the range from 50 to 95...
February 25, 2013

Maths A
A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...
February 25, 2013

math
90
February 25, 2013

maths a
The Bough and Bud Company combined an insect spray with a growth hormone to produce the MOP (More Oranges Production) Treatment, which was expected to increase the number of oranges produced by each tree. The data below shows the number of oranges produced by each tree in two ...
February 25, 2013

MATHS A
A tyre manufacturer has chosen 48 tyres at random from a production line and issued them to taxis for testing. Assume that the 48 numbers you have selected refer to the number of thousands of kilometres travelled during the life of each tyre. (For example, a value of ‘32...
February 25, 2013

Maths A
For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...
February 25, 2013

Maths
For this question, use the copy of the Random Number table provided at the end of this AAT. (This table was copied from page 111 in the Textbook.) Select 48 values according to the following criteria. o The first thirty (30) numbers must lie in the range from 48 to 58 ...
February 25, 2013

Math f(x)
given f(x)= x^2+x and g(x)=2x+1 determine f[g(x)] i dont even know where to start with this question help is much needed
February 22, 2013

chemistry
A factory that specializes in the refinement of transition metals such as titanium was on fire. Provide kinetic-based arguments (concentration and temperature) explaining why water would be dangerous for the firefighters.
February 18, 2013

Chemistry
The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 21.3g of the compound? Please help. I am SO confused on all of this!!
February 16, 2013

Math/Accounts
Estimate the cost of ending inventory based on the retail method using the following information: Cost Retail Beginning Inventory $ 600,000 $ 800,000 Purchases $ 450,000 $ 600,000 Net Sales $1,000,000 A. $150,000 B. $262,500 C. $300,000 D. $750,000
February 13, 2013

Business Analysis
Mahalyk's Water Fun Shoppe specializes in jet skis. Mahalyk's inventory records showed the following for the past year. Purchase Date Number of Jet Skis Cost Per Jet Ski February 10 30 $4,000 May 12 80 $3,000 June 15 20 $3,500 July 20 15 $2,500 Use the FIFO method to ...
February 13, 2013

Business Analysis
A firm has the following inventory information for the first quarter: 01/01 Beginning Inventory 50 units @ $5 01/15 Purchases 80 units @ $5.50 02/15 Purchases 60 units @ $5.25 02/15 Purchases 40 units @ $5.75 Sales 170 units @ $10 Total operating expenses $500 What is ending ...
February 13, 2013

Math
How many distinct numbers greater and equal to 100 and smaller than 3000 can be formed using digits 0,1,2,3,4, without repetition of digits?
February 12, 2013

chemistry
12.50g of an unknown compound (i=2) are dissolved in 50.00g of water and this solution freezes at –7.5 degrees C. What is the molar mass of this compound?
February 12, 2013

Chemistry
its concentration, so it should be mol/L
February 10, 2013

Chemistry
True, however, I keep getting a negative value which is not possible.
February 10, 2013

Chemistry
Find the initial concentration of NO2 if the concentration after 2.00 min is 0.113. k = 0.331 1/(M * s) 2 NO2 (g) + N2 (g) --> 2 N2O (g) + O2 (g)
February 10, 2013

Psychology
Dr. Gillian explained that research has identified over 25,000 genes which are responsible for the genetic information which progresses from generation to generation. These genes are:
February 6, 2013

Organic chemistry
We conducted a diels-Alder reaction of cyclopentadiene with Maleic Anhydride experiment. Though I was wondering why we added ligroin to the maleic anhydride and ethyl acetate. I know ligroin can be used as a solvent, but I thought that ethyl acetate was the solvent in this ...
February 6, 2013

Chemistry
If it had gone down then how would we calculate it
February 2, 2013

Chemistry
Freezing point of pure water = -2, Freezing point of Unknown solution = -1 Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.
February 2, 2013

English
Where reading the poem "LEGAL ALIEN" by Pat Mora . We have to find the rhythm,meter, and assonance . I cant fimd any of that in the poem . Please tell me what each one of them are in the poem .. Reply ASAP please
February 2, 2013

general chemistry
A reaction involves fictional reagents A & B is begun with the inital concentration of 0.05M A and 0.01M B. The reaction reaches completion in 16 seconds. What is the initial rate of the reaction in respect to A? and what is the order in respect to B
January 30, 2013

Math
The expression ax^3+2x^2+cx+1 is 5x^3-3 greater than 3x^3+bx^2+d-7x. Find a, b, c, and d.
January 29, 2013

Chemistry
An aqueous KNO3 solution is made using 73.4g of KNO3 diluted to a total solution volume of 1.86 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/ml for the solution.)
January 29, 2013

elementary math
thank you..
January 25, 2013

elementary math
i did use my poof to prove. im not sure im doing right. here is exercises: 'Suppose a,b,c are integers if a|b and a|c, then a|(b+c).' my answer: Proof. Suppose a|b ans a|c. By Definition of divisibility. we know a|b means there is an integer x with b= ax. Likewise, a|c...
January 25, 2013

Precalculus
How do you solve this problem: sin(90* - x) ----------------- cot^2(90* - x) + 1 The * is a degree symbol!! I haven't seen any problems with degrees in it, usually it's only a variable! If anyone could give me guidelines or show me where to start, I'd really ...
January 23, 2013

physics
Calculate the speed of a proton having a kinetic energy of 1.00 × 10 −19 J and a mass of 1.673 × 10 −27 kg. Answer in units of m/s
January 22, 2013

Spanish
Les vas a dar muchos regalos a tus padres. Quiero comprarles unos guantes a mis sobrinos Clara va a venderle sus libros de literatura francesa a su amiga. Los clientes nos pueden pagar con tarjeta de crédito
January 21, 2013

Algebra
A box with a lid is to be cut out of a 12 inch by 24 inch sheet of thin cardboard by cutting out six x-inch squares and folding them. What are the dimensions to two decimal places of all possible boxes that will have a volume of 100 cubic inches?
January 15, 2013

Geometry
A triangular entraceway has walls with corner angles of 50, 70, 60. The designer wants to place a tall bronze sculpture on a round pedestal in a central location equidistant from the three walls. How can the designer find where to place the sculpture?
January 13, 2013

math
I have a board 18" x 18" x 1/8" I need to support it in an upright position at a 15 degree angle. How big must the base of support be to keep it from falling over.
January 13, 2013

geometry
The coordinates for a rhombus are given as (2a, 0), (0, 2b), (–2a, 0), and (0, –2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas.
January 8, 2013

Science
Does anyone know a Commensalism of the Baltimore Checkerspot? If you do know, I need the awnser ASAP. Please help. Thank you.
January 8, 2013

math
how do I correctly show four as an array?
January 3, 2013

physics
A bobcat jumps with a speed of 5m/s at an angle of 55 degrees. How long does the bobcat stay in the air?
December 23, 2012

algebra
A ball is thrown(from 0') straight up at 50' per second, how long before it hits the ground? How high does it go?
December 19, 2012

Calculus BC
32
December 19, 2012

Science
How does a body fossil form? Is it just bones and teeth?
December 12, 2012

philosophy
explain necessary and sufficient conditions and how providing these is one approach to defining a term
December 11, 2012

Math
The rim of the London Eye (a 135m diameter ferris wheel) moves 26 cm/sec, slow enough for passengers to safely get on the wheel from the platform (2 meters above ground level) without stopping the wheel at the bottom of its rotation. What's the height at the bottom of the ...
December 10, 2012

poli sci
Which of the fundamental American political values does the "Tea Party" most fundamentally support? Do you believe the "Tea Party" is a legitimate heir of the Founding Father's protest against the British? Do you believe the Tea Party will transform ...
December 9, 2012

Physics
I calculated tan and sin (theta) for a physics lab experiment -- two-slit interference I had to use this equation y = L tan (theta), with y = 0.25 and L = 2 and tan (theta) came out to be 7.12 in degrees and 0.1243 in radians. I found sin (theta) by using the triangle for X^2...
December 8, 2012

physics
I need a 1.00 W motor to push a garbage compactor so that it squishes some garbage. The garbage has a spring constant of 49.7 N/m. If I am going to squish it 30 cm, determine how much time the compactor takes.
December 7, 2012

science
thankss
December 5, 2012

science
What is the wavelength of waves transmitted by an AM radio station operating at a frequency of 840 kilohertz? Calculate the energy of a photon whose frequency is 2450 megahertz What is the difference in energy for a photon of ultra-violet radiation, wavelength 319 nm and a ...
December 5, 2012

science
A wolf us chasing a rabbit.Graph the wolf's motion using the following data: 15 m\s at 0 s,10 m\s at 3 s,1 m\s at 4 s,and 0 m\s at 5 s.What does the graph tell you???
December 1, 2012

Math
Could someone explain how to graph the following problem? I don't quite understand what "Graph H for 0 ≤ t ≤ 3 and 300 ≤ H ≤ 340" is asking me to do... The National Oceanic and Atmospheric Administration (NOAA) has been measuring ...
November 30, 2012

American History
true or false The Great Migration was a large-scale movement of hundreds of thousands of southern African Americans to Weswtern farms.
November 29, 2012

physics
exactly. This is all I was given. Possibly SumOf t = T(exp)*length* sin(theta) - W(hang) * length * sin(phi) - W(boom) * L(exp) * sin(phi) = 0 but im not sure.
November 28, 2012

physics
The torques acting on the crane boom can be computed about anaxis passing through the top of the boom. (this is the place wherethe spring scale and mass hanger connect to the boom) apply thesecond condition for equilibrium to the crane boom and derivethe resulting equation for...
November 28, 2012

physics
a clothes washer starts from rest and spins up with an angular accceleration of 10/rad/s^2. Determine the angle through which the washer has moved afer 6 seconds.
November 28, 2012

Math
this problem is modelling daylight hours using the form y = d+a sin[b(t-c)], btw
November 26, 2012

Math
How would I solve for t if y equals 720 minutes of daylight and t=the number of days in 2012 720 = 713.7+152.7 sin [(2pi/366)(t-80.75)]
November 26, 2012

trig
i think i figured out my mistake. it should be 720 = 713.7+152.7 sin [(2pi/366)(t-80.75)] this problem is modelling minutes of daylight in a town using the form y = d+a sin[b(t-c)]. let y equal 720 minutes of daylight and let t=the number of days in 2012
November 25, 2012

trig
How would I solve this problem for t? 720 = 11.895+2.545sin [2pi/366(t-80.5)]
November 25, 2012

spanish literature
Osvaldo Dragun in his story Historia del hombre que se convirtio un perro: what is the conflict that the protagonist feels strongly about?
November 24, 2012

stat and research
3. A researcher is interested in whether listening to music helps or hinders test-performance. To control for differences in cognitive level, this researcher decides to use a within-participants design. He selects a random sample of participants and has them study different ...
November 23, 2012

math
use any method to estimate 667-651
November 21, 2012

Physics
A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...
November 19, 2012

Physics
A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed of the plane relative to the ground, the heading of the plane, and the ...
November 19, 2012

3rd math
Tessie multiplied 3x4, and then doubled it to find 6x8 .did she get the correct answer ? Explained
November 13, 2012

Fractions
thank you
November 12, 2012

Fractions
A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of ...
November 12, 2012

Math
Thank you
November 12, 2012

Math
I have the fraction 1/6. I need to express it as a decimal, fraction expressed with denominator 100 and percentage. Is it correct to have 0.16666; 16.66/100 and 16.66%?
November 12, 2012

Math - urgent
thank you
November 12, 2012

Math - urgent
2. A technician has prepared three solutions from a 600 mL stock solution. • In preparing the first solution ½ of the original volume of the stock solution was used. • The second solution required ¼ of the remaining stock solution. • Preparation of...
November 12, 2012

Cultral Diversity
1.Reserch about the impact of cultral valueson peer social interaction in an early education classroom may lead one to conclude that this enviroment may create biases if the primary social orientation favors:a teacher centered learning b.individual activities c.non- maintream ...
November 11, 2012

Cultual Diversity
1.A mother's eventual submission to her young child's repquests for the toy matchbox car in the hobby shop is representative of the ______ parenting style. a. laissez faire b.authoritarian c.Victorian d. democratic 2.A Native American child spent 30 minutes watching, ...
November 11, 2012

chem 11
a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?
November 5, 2012

Chemistry 11
a gas has an empirical formula C6H7O5. When put in a 50mL bulb at 120 degrees celcius and 120kPa (pressure) it's mass is determined: the mass is 10.37 times as much as C6H6O. What is the molecular formula of the gas (C6H7O5)?
November 5, 2012

Calculus
At a given moment, a plane passes directly above a radar station at an altitude of 7 miles. (a) If the plane's speed is 400 mph, how fast is the distance between the plane and the station changing half an hour later? (b) How fast is the distance between the plane and the ...
November 4, 2012

chemistry 11
if I was asked to set up a procedure that will allow me to check the concentration of aqueous Co2+ ions in a reaction vessel every 15 mintues, what could I do to quickly and accurately determine the concentration of colbalt ions in the solution?
November 4, 2012

Culturally Diverse Background
Will someone check my answers. 1.During a class fingerpainting activity,Doresha appeared perplexed by the teacher's question, What are you doing, Doresha did not respond quickly or with ease. Why did Doresha respond to this eventcast the way she did? a. Doresha is from a ...
November 4, 2012

chemistry 11
if a solution is contanimated with a chemical that causes a larger amount of solid, opaque particles floating in the solution, would the absorbance read too high or too low, and why?
November 3, 2012

Physics
Traveling at a speed of 15.9 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.700. What is the speed of the automobile after 2.00 s have elapsed? Ignore the effects of ...
October 30, 2012

CHEMISTRY! NEED HELP FAST!
i can't find the answer can u show me how to do the work step by step and tell me the answer my homework is due tomorrow
October 29, 2012

English
Contain some national and international news , but focus on news relating to specific area of the country. hhat type of newspaper is this ?
October 28, 2012

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