Total # Posts: 682
I have to find an article (magazine, newspaper, online) from a respected source of business / news content that addresses the impact of global trade on the global, U.S., or local economy. For printed articles, please scan and post as a PDF file. For online content, post the ...
September 5, 2011
A jogger leaves home and runs at a constant speed of 4 miles per hour. Nine minutes later, a bicyclist follows along the same route at a constant speed of 15 miles per hour. Find the bicyclist's travel time needed to catch the jogger.
September 1, 2011
Assume that a population is normally distributed with a mean of 100 and a standard deviation of 20. Would a sample mean of 115 or more be considered unusual? Why or why not?
August 3, 2011
Write an equation to construct a function whose graph is like that of y=x^2, except for pieces removed for values between 3 and 5, and 8 and 9. I am not sure how to approach this question. Would I make a piece wise function? PLease helpp brains about to explode!
July 24, 2011
You know the ratio for the moles of sodium to hydrogen from the equation is 2:1 so you can work out the moles of hydrogen. The volume will depend on the temperature and pressure. 1 mole of gas at 25 degrees C and 1 atmosphere pressure has a volume of 24.465 L.
May 29, 2011
XeF2 is a linear molecule with vibrational frequencies of 515 cm1 (symmetric stretch), 555 cm1 (antisymmetric stretch) and 213 cm1 (bend). A vibrational Raman spectrum is acquired using radiation at 488 nm from an argon-ion laser. Predict, with justification...
May 22, 2011
In the ground state of the H-atom the electron has a total energy of -13.6 eV. What are (a) its kinetic energy, and (b) its potential energy if the electron is one Bohr radius from the central nucleus.
May 20, 2011
Consider a H-atom in a magnetic field. Sketch the possible transitions between the n = 3, l = 2 and n = 2, l = 1 levels. Which lines will not appear if we require that ml = 1,0 and -1 only? How many different frequencies will be seen in the spectrum? What will be the ...
May 20, 2011
An unknown magnetic field produces a set of lines for a transition from a state with l = 3 to one with l = 2, between which there is a maximum energy difference of 6.1x10-4 eV. How many lines are there? What is the magnitude of the field?
May 20, 2011
I am trying to write an email to a professor in Spain. His title is catedrático and I need the email to be formal but am not sure how to be formal in Spanish. Would this be the correct way to start: Estimado Prof (nombre) I'm not sure whether to use "Prof"...
May 9, 2011
Solar heating takes advantage of solar collectors such as the type shown in the figure . During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m^2. About 50% of this radiation reaches the Earth during daylight hours. (The ...
May 7, 2011
Assume all temperatures to be exact. An aluminum spoon at 84 degree C is placed in a Styrofoam cup containing 0.180 kg of water at 12 degree C. If the final equilibrium temperature is 21 degree C and no heat is lost to the cup itself or the environment, what is the mass of the...
May 6, 2011
in comparision to men with learning disorders, women? A.have higher self-esteem b.have better paying jobs c.out grow their difficulties d.have more relationship problems I chose d but i'm not to sure
May 5, 2011
Government Data assign a single cause for each death that occurs in the United States. The data shoe that the probability is 0.27 that a randomly chosen death was due to heart disease, and 0.23 that is was due to cancer. What is the probability that the death was due to some ...
May 4, 2011
Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal. Use one example from Gardeners Art through the Ages and one example from the Internet.
April 6, 2011
Few Facts about Vancouver/Paris
These are facts I have collected about them. They both have a unique atmosphere, lovely streets, and great monuments. They are both livable, and are known to be Metropolitan areas. They are popular tourist destinations. Paris is ranked among the three most important and ...
March 30, 2011
Im not sure if Im being specific enough. I want to know the name of the artist district--neighbourhood/quarter. Shouldn't there only be one, because the question asks for only one.
March 29, 2011
How are Vancouver and Paris different from one another? Ive got to name atleast 8 differences between them. 1. Paris has a population over 2 million, unlike Vancouver which only has a couple thousand. 2.The night life is different. The way the French Party. 3.The dressing ...
March 29, 2011
Which one is the correct sentence? If they both need grammar work do tell. a)This gives evidence that people will work hard, but will never receive a fair deal for their effort. OR b)This gives evidence that people will be working hard, but will never receive a fair deal of ...
March 14, 2011
The meter stick in the drawing can rotate about an axis located at the 20.0-cm mark. The axis is perpendicular to the screen. A force F acts at the left end; the force is perpendicular to the meter stick and has a magnitude of 175 N. A second force, either F1 or F2, acts at ...
February 11, 2011
Can you please tell me if these are right? A gas has a volume of 2.8 L at a temperature of 27 degrees C. What temperature degrees C is needed to expand the volume to 15 L? (P and n are constant.) I got 1334 degress C Combined gas law problem a balloon is filled with 500.0 mL ...
November 14, 2010
i am a decimal with my last digit in the hundredths. rounded to the nearest tenth. I am 6.5. Rounded to the nearest whole number. I am 6. if the sum of my digits is 16. what number am i?
October 30, 2010
Which objects in the solar system have been least modified since the formation of the solar system? a)asteroids b)Kuiper Belt objects c)meteoroids d)terrestrial planets e)jovian moons
September 27, 2010
I need to work out a mechanism for the synthesis of 2-cyclohexylpropanal. I am not sure what the reaction is to make this or what reagents to start from. I thought that maybe it could be an aldol reaction starting from cyclohexanone and propanal but I'm not sure if this ...
September 5, 2010
You are given a 6-month assignment by your employer to work at a remote location in Australia. In order to pack as lightly as possible, you try to research the climate of a small town in Australia. There is little data since no major cities are located within 300 miles of the ...
July 13, 2010
Compare England in the 17th century with other absolutist regimes on the continent of Europe. How did the English situation differ from that of absolutist states? What was the major reason for Englands exceptional situation?
June 23, 2010
200 g of a non-electrolye is dissolved in 1000 g of water. The boiling point of the solution is then measured to be 101.5 C. What is the molar mass? (the Kb for water is 0.51 C/m) I know deltaT = 0.51 C/m but where do I go from there?
June 8, 2010
Scandium Sulfide. Would i be correct in thinking that the bonding associated with this compound is Ionic. I think this as the two ions involved are oppositely charged? If im wrong could you please tell me why. Thanks so Much in Advance.
June 2, 2010
An object is released into the air at an initial height of 6 feet and an initial velocity of 30 feet per second. The object is caught at a height of 7 feet. Use the vertical motion model, h = -16t^2+vt+s, where h in the height, t is the time in motion, s is the initial height...
April 28, 2010
Ok thanks, so the transfer of energy is work done by the body? to clarify ... As the diver walks up the steps chemical energy is transferd through work and converts into GPE and kinetic energy. what is the energy transfer to begin the dive? chemical? once the dive has begun ...
April 27, 2010
I am trying to gain a understanding of the transfers and conversions of energy whilst the subject (being a diver) goes through its motions. Maybe i should be clearer .... SO as the diver makes his way to the top of the steps chemical energy is transferred from the body to the...
April 27, 2010
Hi there, would someone be able to tell me if this is right or almost right or really not right?! The scenario being explaining the transfers and conversions of energy of a diver. from walking up the steps to standing at the top of platform to jumping into pool and to start ...
April 27, 2010
hey. show 2sin(pi/14) is a solution to x^3-x^2-2x+1=0 and hint: let x=2sinu and sin(7u)=1 i can't seem to solve when i sub in the x value. how can i relate this to the seventh root of inifinity. i multiplu by sin^4 but they it just doesnt work.
April 23, 2010
What would be the product of the reaction of 4-methyl pyridine with Ac2O/AcOH and PhCHO? I'm really stuck on this. I'm guessing the pyridine will attack the anhydride and form an acyl pyridinium ion but I'm not sure where to go from there. If that reacts with AcOH ...
April 21, 2010
What would be the product of a reaction between methanal and pyrrolidine in acid? I know that normally a reaction between a carbonyl and a secondary amine would form an enamine. Here I am confused because there are no hydrogens that can be removed to form the enamine as this ...
April 7, 2010
Write the Hamiltonian operator for 2 electrons in a 1D box of length a. I know that the Hamitonian is a sum of the kinetic and potential energies. I was thinking that for 2 electrons in a 1D box it would be: -2((hbar^2)/2m_e)(d^2/dx^2)) + Coulomb interaction for 2 electrons I ...
April 5, 2010
Time dilation is the theory of time relative to motion. It is the principle that time elapsed is relative to motion, such that time passes more slowly for a system in motion than for one at rest relative to an outside observer. Further, as predicted by Einstein's special ...
March 28, 2010
Im after info that will help me answer what the relevance of the age of the oceanic crusts and the continental crusts within the south american plate Are there presence of hotspots on the south american plate? what is the process that is responsible for the change in area of ...
March 25, 2010
THANK YOU what is the magnitude of acceleration that the force 5.0 x 10³ N causes when applied to a vehicle with a mass of 1.1x10³kg??? How do i present the answer for this ?
March 24, 2010
SO desperate with help with this. What is the magnitude of the acceleration that this force will cause when applied to a car with a mass of 1.1x10³Kg Then calculate the final speed of the car (above) assuming that it was standing still initially and that the force of 5.0 ...
March 24, 2010