Friday
February 27, 2015

Posts by Student


Total # Posts: 606

physics
sorry. but i posted under the original question and got not response. but i tried this for part b and i got it wrong
December 12, 2010

physics
The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just ...
December 12, 2010

physics
i tried what you said for part b and it was marked wrong.please help
December 11, 2010

physics
The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just ...
December 11, 2010

please help dont know how to solve
i tried to solve for b but got it wrong. can you just tell me how i can get it started please.
December 10, 2010

please help dont know how to solve
The pole vault landing pad at an Olympic competition contains what is essentially a bag of air that compresses from its "resting" height of 1.1 m down to 0.1 m as the vaulter is slowed to a stop. (a) What is the time interval during which a vaulter who has just ...
December 10, 2010

physics
A cylindrical air duct in an air conditioning system has a length of 3.5 m and a radius of 5.00 m. A fan forces air (ç = 1.8 Pa·s) through the duct, such that the air in a room (volume = 242 m3) is replenished every 12 minutes. Determine the difference in ...
December 6, 2010

physics
A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A2 = 0.0600 m2. The gas has a density of ñ = 1.30 kg/m3. The Venturi meter has a ...
December 4, 2010

Chemistry
The pH of a 0.0050 M aqueous solution of calcium hydroxide is? Make sure to include all equations.
December 3, 2010

math
I was hoping that this question was answered... It's Greek to me!
December 1, 2010

physics help
i really dont know how to start this thats why i need help on this
November 28, 2010

physics help
Two thin rectangular sheets (0.15 m 0.50 m) are identical. In the first sheet the axis of rotation lies along the 0.15 m side, and in the second it lies along the 0.50 m side. The same torque is applied to each sheet. The first sheet, starting from rest, reaches its final ...
November 28, 2010

physics
A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beamThe angle between the beam and the horizontal is 30 degrees upwards and the angle between the horizontal and the ...
November 28, 2010

physics help me please
A 1220 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1990 N crate hangs from the far end of the beamThe angle between the beam and the horizontal is 30 degrees upwards and the angle between the horizontal and the ...
November 28, 2010

Statistics
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking¡ªeven if they are not exposed to the usual pattern of sunlight. ...
November 20, 2010

Statistics
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking¡ªeven if they are not exposed to the usual pattern of sunlight. ...
November 20, 2010

physics
A worker pushed a 34.0-kg block 10.0 m along a level floor at a constant speed with a force directed 39.0° below the horizontal. If the coefficient of kinetic friction is 0.20, how much work did the worker do on the block?
October 28, 2010

Physics
What is the probability density at the fifth carbon atom if the electron is in the n=2 energy level? I have the formula as follows: Probability density = p5= (2/1.65) sin^2 (4x2pi/11) I know the final answer is 0.69 nm -1. However, I do not know how to retrieve this final ...
October 28, 2010

Physics
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 150m above the glacier at a speed of 110m/s. How far short of the target should it drop the package?
October 22, 2010

physics
Tarzan, who weighs 780 N, swings from a cliff at the end of a 12.0 m vine that hangs from a high tree limb and initially makes an angle of 49.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends upward. Immediately ...
October 11, 2010

calculus
Calculate the volume of the body which is obtained by rotating the curve y = ex 2px, 0  x  1 about the x-axis.
August 13, 2010

trig
Calculate the amplitude, period, phase shifts, and 5 points for y=2-sin(2piex/3)
July 27, 2010

trig
your amazing.
July 27, 2010

trig
Let Q be an acute angle such that sinQ=.6. Find the values of the following using Trig Identities: cosQ and tanQ
July 27, 2010

chemistry
Def, have a better understanding. Thanks so much
July 16, 2010

chemistry
each material listed, sorry for not being specific.
July 16, 2010

chemistry
Which of the following is considered a Lewis acid or a Lewis base. I- H2O BCl3 NH3 OH- H+ CO2 SO2
July 16, 2010

chemistry, chemical kinetics
Thanks bro, atleast I know the second question can be right.
July 2, 2010

chemistry, chemical kinetics
I keep getting these questions wrong, could someone please help. Thanks so much. Question 1 For the following overall reaction, the rate constant is 3.4x10^-2. A(g)+ 2B -> 2C + D What may be the rate reaction? Question 2 The rate law for this reaction is R=k[NO][Cl2] ...
July 2, 2010

physics/orbital speed
thnk you so much.!
June 17, 2010

physics/orbital speed
an asteroid orbits the sun at a constant distance of 4.44e+11 meters, the suns mass is 1.00*10^30kg, what is the orbital speed of the asteroid? Please explain step by step thanks
June 17, 2010

physics
A boy carries a sack on one end of a very light stick that is balanced on his shoulder, at an angle of 22.0 degrees up from the horizontal. The mass of the sack is 7.00 kg, and it sits 1.20 m from his shoulder. If his hand is 0.350 m from his shoulder, on the other end of the...
June 16, 2010

physics
A rotating water pump works by taking water in at one side of a rotating wheel, and expelling it from the other side. If a pump with a radius of 0.120 m starts from rest and accelerates at 30.5 rad/s2, how fast will the water be traveling when it leaves the pump after it has ...
June 9, 2010

Confidentiality of Health information
The newspaper phones a rehab clinic and asks if Sally celebrity is a patient and what is her status. The clinic should A. Tell the newspaper the truth B. lie and say she's not if, in fact she's there. C. acknowledge her presence but give no details on status. D. say ...
April 28, 2010

PHYSICS
IS the answer going to be (-60,60)
April 8, 2010

PHYSICS
A ball of mass m at rest at the coordinate origin exploded into three equal pieces. At a certain instant, one piece is on the x-axis at x=40cm, and another is at x=20cm, y= -60 cm. Where is the third piece at that instant.
April 8, 2010

CHEMISTRY
Why do the metallic elements of a given period (horizontal row) typically have much lower ionization energies than do the nonmetallic elements of the same period?
March 31, 2010

Grammer
I need this sentence to be seperated into a gerund phrase "jumping out of airplanes sounds scary to me." Please help
March 25, 2010

Chemistry
why are the orbitals of the hydrogen atom described as probability maps? Why are the edges of the hydrogen orbitals sometimes drawn to appear "fuzzy"?
March 25, 2010

AP Biology
DOES ANYONE HERE ACTUALLY ANSWER A QUESTION -___________- Production of Protein: Protein Synthesis 1. transcription (could image as to photocopy a page named RNA of a book called DNA) 2. translation (read page named RNA and turn it into protein) Transcription: Creation of ...
March 24, 2010

Chemistry
Why is the light from an incandescent light bulb white?
March 9, 2010

Chemisty
In which cases are higher-energy photons released, with Li+ or Cu2+? How do you know?
March 9, 2010

Chemistry
Nitrogen and hydrogen react to form ammonia. Consider the mixture of N2 and H2 in a closed container. In this container there are 6 diatomic molecules of hydrogen and 6 diatomic molecules of nitrogen. assuming the reaction goes to completion draw a representation of the ...
March 3, 2010

Chem 1LB
just type it in. it works when its negative.
February 21, 2010

Chemistry
thanks Dr. bob.
February 21, 2010

HCA 270 Approaches to Valuation
Do your own homework. The rest of us earned our degrees
February 18, 2010

chemistry
for body diagonal. take face diagonal and square it and take edge diagonal and square it. add those 2 together than take the SQUARE ROOT of it. Answer. so its basically the a^2+b^2=c^2 equation.
February 8, 2010

math
where does 1.06 come from
January 27, 2010

math
Sheryl correctly answered 85% of the questions on her 200-question biology final. Fernando scored a 90% on his 180-question chemistry final. (a) Who answered more questions correctly? (b) Who answered more questions incorrectly?
December 8, 2009

math
The ratio of boys to girls in Mr. Joiner’s class is 5 to 7. If there are 15 boys in the class, how many total students are in the class?
December 7, 2009

math
Simplify each of the following, if possible. Write your answers in the exponential form ab. (a) 24 • 25 • 28 (b) 34 + 2 • 34 (c) 250 • 250
December 4, 2009

math
Explain whether the set {0, 1, 2} is closed with respect to addition on whole numbers.
December 2, 2009

math
Oh another thing I forgot to add, the problem I have with this question is I don't know where to start, I know I need a graph and equation, but I don't know exactly where to start
November 20, 2009

math
The tides at Cape Capstan, New Brunswick, cause the depth of the water in the harbour to change. The tidal chart indicates that the tides have a high point of approximately 10 m at 2.00 pm and a low point of 1.2 m at 8.15 pm. A sailboat has a draft of 2m. The water needs to be...
November 20, 2009

physics
A spring with a force constant of 300 n/m is compressed 5 cm. What is the work done on the spring?
November 17, 2009

physics
Is it impossible to lose all of the kinetic energy in a collision? Or, does a ball which bounces several times before eventually coming to rest show how kinetic energy can completely disappear?
November 13, 2009

physics
in the cabin of a jetliner that cruises at a sped of 600/km/h, a opillow drops from an overhead rack. since the liner is moving so fast why doesn't the pillow slam into the omoartment when it falls?what is the horizontal speed of the pilow relative to the ground? And ...
October 28, 2009

physics 1
need wieght in lb.s an apple weighs 1N mass in kilograms give weight in lb.s
October 28, 2009

physics
Calculate in newtons weight of 2.5kg melon. and what is it's weight in pounds?
October 28, 2009

AED 200
How is it wrong to converse with other students and ask for help with homework?
October 20, 2009

math
they need common denominators, so: 1) find a common denominator. in this case, the lowest one is 24. 2) make both denominators = 24. 2/3 x 8/8 = 16/24 5/8 x 3/3 = 15/24 3) add them! 16/24 + 15/24 = 31/24 or 1 7/24
October 6, 2009

physics
soo for physics, we did a lab where we launched a cart on a track on the floor and recorded time, distance, etc. to figure out things. one of the questions on the lab is: can you think of a simple follow-up experiment that would allow you to determine how much the cart's ...
October 6, 2009

biology
The length of DNA HELIX occupied by one nucleotide pair is 3.4 angstroms. What is the length in angstroms of this unknown DNA fragment? How do you calculate Angstroms?
September 17, 2009

Biochemistry
Two molecules of DNA are the same size, but differ in base composition. One molecule contains 20 % (A + T) while the other contains 60 % (A + T). Which molecule has the higher T m? Why?(The m is a subscript of T) I'm not sure what T m is..or how to calculate it
September 17, 2009

Environmental Science
Your comments to the editor of your favorite magazine intrigued her enough to call you and request that you write an editorial, for which, you note with a little surprise, you will be well-paid. She provides you with two topics which she feels would be of great interest to ...
August 8, 2009

Math
Can anyone help me with this equation in math. here it is..... 5x x 18.75=93.75 does anyone no how to convert this into the anwser?
June 10, 2009

Algebra
This question was just some random one on a math sheet. There were no directions, and I"m not sure what to do. 5(x-3)=? Thanks!
June 6, 2009

Algebra
Solve by factoring: x^2+2x+4x+8=0 Thank you!
June 6, 2009

Algebra
Factor: 2x^4-4x^3y^2+8x^2y Thanks for the help!
June 6, 2009

HCA 210
In what ways do health care expenses affect an economy? What are the economic advantages to government involvement in health care? What are the economic disadvantages? What are some ways of curbing the negative impact of rising health care costs on an economy?
April 22, 2009

Psychology
Read the text book again, I have taken this course read the text book!!!!!!!!
February 8, 2009

Psychology
fkit, your attitude does not deserve help. Ms. Sue, was pointing out to you that there are not many sources available on the web and the text materials are most likely the most useful source you'll find. After seeking through Google for clarification, I too was not able to...
February 8, 2009

english
Hello, Where can I find more information about Aaron the moor in "Titus Andronicus" by Shakespeare? Prompt: As Tamara's star rises, so does Aaron's influences. How does he use it? What are his stated motives and confessed motives? Why can Aaron not act ...
December 31, 2008

11th grade CHEMISTRY TITRATION LAB!
alright thank you very much i appreciate it! :)
December 14, 2008

11th grade CHEMISTRY TITRATION LAB!
oh ok..i just wasnt sure if the vinegar was acetic acid because the procedure saud determining the concentration of acetic acid in an unkown sample of vinegar. thank you very much though! oh one last question, i understand the purpose of lab and how to conduct the lab but im ...
December 14, 2008

11th grade CHEMISTRY TITRATION LAB!
i have a tritation lab due tomorrow and i am stumped on a couple things. its a titration lab using sodium hydroxide (NaOH)- 250 mL 0.300 M concentration, 10 mL of an unknown substance of vinegar, the avg. of titrated NaOH in the flask with vinegar is 27.7 mL firstly its a ...
December 14, 2008

literature
Number 14 isn't A. I took the test and 14 was B.
December 9, 2008

Grade 11 Physics - Light Unit
We did an experiment of Snell's law of refraction and we shined a light through the centre of semicircular prism on a flat surface to measure the angle of refraction. That was one of our questions I didn't understand necessarily why.
December 6, 2008

Grade 11 Physics - Light Unit
Why must rays be shone in the centre of a flat surface? Describe the difficulty thats results if this is not done.
December 6, 2008

Astronomy -more help!
I checked out the graph, but when I go to 10^3 vertically, how far over am I looking. There are several lines, which one will tell me how much mass a star could have while on the main sequence to support life? thanks!
October 29, 2008

Grade 11 Physics
Oh so that the final result is 2(d-v2t) = a ________ -t2
October 5, 2008

Grade 11 Physics
Rearrange the equation : d=v2t - 1/2at(squared) to solve for a
October 5, 2008

11th grade
The arch of a bridge is a semi ellipse, the span is thirty feet and the top of the arch is ten feet above the major axis. the roadway is horizontal and is two feet above the arch. find the vertical distance from the roadway to the arch at five feet intervals in order to ...
September 28, 2008

Math
James Profit wants to take National Widget Company public. He is interested in the relationship between the size of the initial public offering and the price per share. A sample of 10 companies that recently went public revealed the following information: size($M)price per ...
September 15, 2008

Probability/Statistics
Please help!!! Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100 widgets at a time at the .08 level of significance. The specific standard requires ...
September 15, 2008

Population size Checkpoint
Explain the four factors that produce changes in population size. Which factors are affecting the population size in the video? What do you predict will happen to the nutria population after all the land is depleted of the nutrias’ food resource?
September 8, 2008

Ethnic Diversity
I agree..Axia needs to update,3 years later and it's the same checkpoint for the same week 5...and no new answers
September 2, 2008

ocenography
i have to search for a recent ocenaographic event to write a book report on has to be on the internet what is agood website or where should i go so i can read about it.....
August 28, 2008

Statistics
Need major help on this one. Sooo confused... Binomial distribution to solve the problems. There is a 60 percent probability that a store will sell one of Red bags to any customer who comes into the shop and views the bags. Out of the next 7 people who come into the shop, what...
August 24, 2008

Statistics
Need help! A normal distribution with a mean of 20 and a standard deviation of 2 is evaluated to solve a business problem. What is the probability that the value in the population is between 20 and 30? What is the probability that any value in the population is between 10 and ...
August 21, 2008

Stats
You are a health counselor and certified physical fitness worker for a local health club. You have been assigned to prove the beneficial results of your weight reduction program. You have pulled the files on 18 women, who all began your program six months ago and who are still...
August 13, 2008

Stats
A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon-to-1 p.m. lunch period. The waiting time (operationally defined as the time elapsed from when the customer enters the line until he or she ...
August 13, 2008

Stats
An article (N. Hellmich. "'Supermarket Guru' Has a Simple Mantra,” USA Today, June 19, 2002, p. 70) claimed that the typical super market trip takes a mean of 22 minutes. Suppose that in an effort to test this claim, you select a sample of 50 shoppers at a ...
August 13, 2008

Statistics .05 level
According to a survey conducted in October 2001, consumers were trying to reduce their credit card debt (Extracted from M. Price, “Credit Debts Get Cut Down to Size." Newsday, November 25, 2001, p. F3). Based on a sample of 1000 consumers in October 2001 and in ...
August 12, 2008

Statistics
testing for the differences between means of 2 independent populations where the variances in each population r unknown, u must first perform the F-test for the difference between 2 variances. Which of the following is correct? a)If the null hypothesis of the F-test is ...
August 12, 2008

Stats
If we are testing for the difference between the means of 2 independent populations presumes equal variances with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to a) 39 b) 38 c) 19 d) 18.
August 12, 2008

biology
they are actually five cells, sense and respond to change reproduce energy DNA
August 11, 2008

algebra
yes instead of being 612! needs to be 6!2!
August 11, 2008

algebra
i need explanation how they solved this one the answer is provided: finding the number o fdistinguishable permutations. (15!)/(4!3!612!) = 6, 306,300
August 11, 2008

math
i remember correctly i had this on one of my homeworks . 40-32 = 8 therefore 8% because if you subtract 40 - 8%
August 11, 2008

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

Members