Wednesday

November 25, 2015
Total # Posts: 703

**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*

**algebra**

i need help in this one for the steps. find the therm that does not contain x in the expansion of ((8x) + ((1)/(2x))^8
*August 11, 2008*

**algebra**

i wrote down the incorrect problem sorry the actual problem is ((x) + ((1)/(x)))^40
*August 11, 2008*

**algebra**

i am lost in the steps i am working with binomial theorem to expand the expression. Finding the three first terms in the expanison of : ((x^2) -((1)/(2x) ^8)
*August 11, 2008*