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April 1, 2015

Posts by dave


Total # Posts: 671

science
D.
September 29, 2010

calculus
a right circular cylinder has a volume 600cubic cm. if it costs $2 for the material needed to make the top and bottom and $3 for the material needed to make the sides, what is the radius and height of the cylinder that would cost the least?
September 20, 2010

chemistry
For which of these elements would the electron affinity process shown be least favorable? 1. H + e− ! H− 2. Li + e− ! Li− 3. F + e− ! F− 4. O + e− ! O− 5. N + e− ! N−
September 15, 2010

chemistry
The first ionization potential of the elements B, C, and N (atomic numbers 5, 6, and 7) steadily increases, but that of O is less than that of N. The best interpretation of the lower value for O is that: 1. the ionization potential of N is a maximum and the values decrease ...
September 15, 2010

chemistry
For which of these elements would the electron affinity process shown be least favorable? 1. H + e− ! H− 2. Li + e− ! Li− 3. F + e− ! F− 4. O + e− ! O− 5. N + e− ! N−
September 15, 2010

chemistry
That weird symbol was supposed to be quantum number l.
September 14, 2010

chemistry
In an atom, the maximum number of electrons having the quantum numbers n=5 and §¤ = 3 is: 1. 9. 2. 14. 3. 50. 4. 25. 5. 7. Shouldn't the maximum number be a lot bigger than the answer choices?
September 14, 2010

12th Grade Maths
simplify (e is positive) (24e)^1/3 / (3e)^1/3
September 13, 2010

chemistry
Thank you, sir.
September 3, 2010

chemistry
The electron in the n = 5 level of a hydrogen atom emits a photon with a wavelength of 1280 nm. To what energy level does the electron move?
September 3, 2010

science/acceleration
Due to a cart's sudden acceleration, a 200g wooden block remains on the front of the cart and does not slide or fall off. The mass of the cart is 10kg. The coefficient of static friction between the block and the front of the cart is 0.30. Calculate the cart's minimum ...
September 2, 2010

physics
at on time, the velocity of a rifle bullet was measured using a ballistic pendulum made up of a wooden block suspended from a string. the block used here has a mass of 20kg. a 50g rifle bullet is fired into the block, penetrating it by 10cm and causing it to swing upwards, ...
September 2, 2010

calculus
The limit as x approaches infinity of (e^x+x)^(1/x). I got that it diverges, but I'm not sure if I made a mistake. My work: lim(e+x^(1/x)) lim(e+(1/x^x)) lim(ex^x+1)/x^x l'hopital:lim(e^(e(lnx+1))+1)/e^(lnx+1) diverges?
September 1, 2010

Math
Thanks! Connor looks like he nees some help too.
August 31, 2010

Math
2x+2=8 Solve for x
August 31, 2010

Pre Calc
thats supposed to be a fraction all equel to f(x).
August 31, 2010

Pre Calc
thats supposed to be a fraction all equel to f(x).
August 31, 2010

Psychology
No need to shout Jen. I misunderstood her question. I would like help finding an article that is peer reviewed that pertains to my original question. I have searched my university's library and cannot find any related articles.
August 19, 2010

Psychology
Yes. Please!
August 19, 2010

Psychology
• Find a peer reviewed article which discusses the effects of optimism on physical and psychological health. • Write a 1400 to 1600-word paper summarizing the article and stating your opinion on the validity of the study or studies.
August 19, 2010

Math
How would I calculate the area of a sector of a circle with radius 2 m that subtends an angle pi/3
August 14, 2010

college math
I do not understand a problem from a text book or how to solve the problem for the answer. Could shomeone show me the steps (show work) on how to solve this question. The sum of the intergers from 1 through n is n(n+1)/2. the sum of the squares of the intergers from 1 through ...
August 13, 2010

math-college algebra
Thank you Reiny. I see where I was making my mistake. I was multiplying 1/2*2 and 1/2*-6. instead of 2-6 then multiplying 1/2. Thank you for your help.
August 11, 2010

math-college algebra
y-3=1/2(x-6) "finding the value of a variable" x=2 I know the answer is 1, but how do I work the problem to get 1. This problem is in our text book and in the back it states the answer is 1. I tried working the problem serval times and I do not come up with one.
August 11, 2010

Algebra
I need a home test corrected before I turn it in on Monday. Can anyone help?
July 31, 2010

math
what is the probability of a six card hand cantoning no fives?
July 29, 2010

math
a group of hockey officials consists of 6 referees and 5 linesmen. the probability that the youngest referee and linesman would be selected if one referee and two linesman are required is a) 1/15 b)1/30 c) 1/60 d)1/120
July 29, 2010

trig
A Ferris wheel has a radius of 15 meters and takes 20 seconds to complete one full revolution. The seat you are riding in, takes 7 seconds to reach the top which is 35 meters above the ground. Write a sine or cosine equation for the height of your seat above the ground as a ...
July 26, 2010

math
A committee of 2 teachers and 3 students is to be randomly chosen from a group of 5 teacher and 6 students. the total number of different committees is?
July 26, 2010

math
the number of ways in which 18 students in Mr. Garr grade 3 class can line up for a photo if the the Armstrong triplets cannot all be together is n x16! what is n?
July 26, 2010

Physics
A 2.9 kg body is at rest on a frictionless horizontal air track when a horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in the figure. ...
July 22, 2010

physic
1.74 m/s
July 20, 2010

Trigonometry
Hi,how do I find both solutions of the equation cos41 = 0.35 between degrees 0 and 360? Many thanks
July 8, 2010

Math
How do I find the x intercepts of the parabola y=x^2-6x-7? Thanks
July 7, 2010

physics
An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +13 m/s and measures a time of 20.5 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to ...
July 4, 2010

algebra
Ticket Sales Living in or near a metropolitan area has some advantages. Entertainment opportunities are almost endless in a major city. Events occur almost every night, from sporting events to the symphony. Tickets to these events are not available long and can often be ...
June 24, 2010

Calculus
P= r - c p= (5000-30x)(80+x)-300x p'= -60x + 2300 x = 38.3 therefore 38.3 * 30 = 1150 per person
June 19, 2010

algebra
1570536900 x 3966.848485^-2 =
June 13, 2010

Math
function y = 4-2(2t+pi/2), where t is measured in radians. A.choose one option which gives the value of the function when t=pi radians B.choose one option which gives the period of the function in radians. a)0 b)1 c)2 d)4 e)pi/4 f)pi/2 g)pi h)2pi
June 12, 2010

Math
: PROGRAM: PYTHAG : Prompt A, B :Fix 2 ã : (A2 +B2) ¨ C :Disp "C=",C : Float Choose the three true options concerning this program. Options A) The program can be used to find the length of the hypotenuse of a right-angled triangle. B) The ...
June 12, 2010

Math
Find the equation of the straight line that passes through the points (−1, 5) and (5, −1). Find the coordinates of the point where this line crosses the y-axis
June 11, 2010

Math
How do you find the vertical and horizontal assymptotes of the graph of the rational function? f(x)= 3x^2-5x+2/6x^2-5x+1 f(x)= 2x+3/(ãx^2-2x+3)
June 6, 2010

communication
In my opinion i find that C is also the best answer choice here.
June 2, 2010

SCIENCE 1
thankyou so much
May 11, 2010

SCIENCE 1
the van der waals equation incorperates coreections for the ideal gas law in order to account for the properties of real gases. one of the corrections accounts for A.the average kinetic energy being inversely proportional to temperature B. the possibility of chemical reaction ...
May 11, 2010

SCIENCE 1
thankyou so much
May 11, 2010

SCIENCE 1
Which of the following is a true statement about chemical equilibria in general A.there is only one set of equilibrium concentrations that equal teh Kc value B.eqauilibrium is the result of cessation of all chemical change C.at equilibrium the rate of the forward reaction is ...
May 11, 2010

SCIENCE 1
Actually you are 100% correct and i agree with C. thankyou so much
May 11, 2010

SCIENCE 1
for following reaction at equilibrium if we increase the reaction temperature the equilibrium will 2SO3(g)<-->2SO2(g)+O2(g)(deltaH degrees=198kJ) A. not shift B.the question can not be answered because Keq is not given C.shift to the right D. shift to the left I am going...
May 11, 2010

SCIENCE 1
thanks
May 11, 2010

SCIENCE 1
The van der waals equation incorporates corrections to the ideal gas in order to account for the properties of real gases one of the correcctions accounts for A.attractions between molecules B.the quantum behavior of molecules C.that average kinetic energy is inversely ...
May 11, 2010

CHEMISTRY
d.29
May 9, 2010

chemistry
533.0666 kj
May 4, 2010

Trig
How do i set this trig problem up? PLEASE help me. Find tan (s + t) given that sin s = 1/4, with s in quadrant 2, and sin t = -1/2, with t in quadrant 4.
May 3, 2010

trig
how do i set this problem up? Find tan (s + t) given that sin s = 1/4, with s in quadrant 2, and sin t = -1/2, with t in quadrant 4.
May 2, 2010

physics
With what speed must a muon travel so that its correct (relativistic) momentum is 8.0 percent greater than the value that would be computed nonrelativistically? Give your answer as a ratio to the speed of light
April 26, 2010

4th grade math
how do i mutipli fractoins
April 22, 2010

Calculus
Need an answer to this Calculus Question. I keep getting this type of question wrong. Thanks. Differentiate the Function: y = (3x-1)^2(2-x^4)^2 y =
April 19, 2010

Physics Help Please!
If the price of electrical enegy is $0.10 per kilowatt *hour, find the cost of using electrical energy to heat the water in a 12.0m * 9.00m * 1.5m swimming pool from 15 degrees C to 27 degrees C. So the change in temperature is 285.15 , the volume is 162m^3, the specific heat ...
April 6, 2010

physics helpppp
Okay, dude your velocities are ridiculous, does 150 m/s even make ANY sense to you?
March 30, 2010

physics help!!!
In February 1955, a paratrooper fell 365 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. Assume that his speed at impact was 60 m/s (terminal speed), that his mass (including gear) was 90 kg, and that the ...
March 26, 2010

us history
Is there a good online source of information to compare and contrast the initial formation of two states—Virginia and Pennsylvania—by evaluating and listing the similarities and differences of the first state constitution for each state.
March 23, 2010

English
escaped; broke loose from; slipped out of
March 23, 2010

Math
P=I/rt Where P=principal(amount invested) I=Interest(amount earned) r=rate t=time So in order to fin the rate the formula can be written: r=I/Pt
March 23, 2010

science with planets
Only 3 of the 9 planets in our solar system have official "discoverers" and "times of discovery". Uranus was discovered by Sir William Herschel in 1781. Neptune was discovered by John Couch Adams in 1846. Pluto was discovered by astronomer Clyde Tombaugh in...
March 23, 2010

U.S. History
I have limited information in my text and I am having trouble finding a good source specific to this subject.
March 22, 2010

U.S. History
Do you a good source of information
March 22, 2010

Physics, help please!!!
A tank is fillwed with 0.7m of water, a hole at the bottum of the tank with a radius of 0.001m is opened. At the same time, water is added to the tank at the same rate as it exits, calculate the speed at which water flows out from the hole. I am using P=Po+pgh which gives me ...
March 18, 2010

math
i dont know
March 18, 2010

Physics
You need the coefficient
March 9, 2010

math
write each decimal as a fraction or mixed number in simplest form 0.78
March 7, 2010

probability
A bag contains 4 purple, 3 blue and 2 red cubes. Select 3 cubes and stack on table next to the bag. What is probability of the cubes being red, purple then blue
February 28, 2010

Physics
An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 1.00 × 104 V. (a) Find the final velocity after the original acceleration period. (b) It then passes between two horizontal plates 6.0 cm long and 1.0 cm apart ...
February 24, 2010

Physics
looking for info on like question, if we do not know how to solve it and equation is greek to us, need a step through. whoever posted first obviously doesn't know how to help...
February 16, 2010

college
What amount would accumulate if you invested $1,000 at the end of each period for 21 periods at 10%?
February 10, 2010

US History
How did the views of the Whigs and Democrats differ from those in the Free-soil Party?
February 10, 2010

Biochemistry
Hi, In this task for our school, we were requested to investigate a method for testing the amount of caffeine content in coffee. There are 3 main questions as fellows 1. What would be a good method to measure the amount of caffeine in coffee without extracting it? 2.What is ...
February 8, 2010

Accounting
A company has a $150,000 invoice that is due in 60 days with a 2% discount if paid in 10. The company can invest the 2% or $3000 and earn 6% per year. What should the company do?
February 4, 2010

physics
so it wud be (60x9.8-12^2)/34?? = 13.06N??
December 6, 2009

physics
Driving in your car with a constant speed of 12 m/s, you encounter a bump in the road that has a circular cross section. If the radius of curvature of the bump is r = 34 m, find the apparent weight of a 60 kg person in your car as you pass over the top of the bump in Newtons.
December 6, 2009

college physics
yes.. it's the "brothers of mercy" problem. a plane is flying at 40 m/s, descending at an angle of 37 degrees to the horizontal. it is 100 m in the air and it is trying to drop a package to a man at R distance. what is R? to find R, i needed to solve for time. ...
November 29, 2009

college physics
using the quadratic equation on a 2 dimensional projectile motion problem... i am solving for tf and i have it worked all the way down to: -100m(tf)-100m(tf) / -10m/s^2(tf)^2 or -200m(tf) / -10m/s^2(tf)^2 is the answer 20 seconds? algebra is not my strong suit =(
November 29, 2009

college physics
ahhh i finally got it!!! thank you so much!
November 29, 2009

college physics
my variables are a little different than yours, but here is what i have.. Yf=Vosinθ (tf)-.5g(tf)² Yf=Vosinθ(xf)/Vocosθ-.5g(xf/Vocosθ)² i'm having trouble isolating Vo. am i supposed to use the quadratic equation? my algebra is not very good.. ...
November 29, 2009

college physics
thank you very much.. i understand what you are saying, but can you show me the algebra steps to get the 2 solutions? i keep substituting the first equation into the second and try to work it out, but for some reason i am still doing it wrong.
November 29, 2009

college physics
(Projectile Motion) You are being asked to bombard an enemy fortress that sits on a 40 m tall cliff 100 m from your location. Your cannon has an elevation of 37 degrees. What velocity must your cannonball have to hit the walls of the fortress?
November 29, 2009

math
alright.. this is the linear programming question i got.. JJ Manufacturing has three factories (1,2,3) and three distribution centers (A,B,C). shipping costs from the factories to the distrubution centers is as follows from factory 1 to center A: $6 from factory 2 to center A...
November 24, 2009

financial accounting
Review the annual reports for PepsiCo, Inc. and The Coca-Cola Company in Appendixes A & B, especially the Consolidated Statements of Income and the Balance Sheets on pp. A4, A6, B1, & B2 of Financial Accounting.
November 23, 2009

maths linear programming
alright.. this is the question i got.. JJ Manufacturing has three factories (1,2,3) and three distribution centers (A,B,C). shipping costs from the factories to the distrubution centers is as follows from factory 1 to center A: $6 from factory 2 to center A: $8 from factory 3 ...
November 23, 2009

CRT 205
argument
November 22, 2009

math
6.00+6.00(1+x)/(.10-x)=145.20 solve for x.
November 19, 2009

ALGEBRA
145.20=6.00+6.00(1+x)/ (.10-x) Solve for X
November 17, 2009

Finance
At what rate must $500 be compounded for it to grow to 1079.46 in 10 years? 8 percent? i think
November 12, 2009

English
dangling modifiers to paint one's house frequently one must do it oneself All homeowners almost try to paint at one time or another
November 5, 2009

Chemistry
why not #4? that has two resonance structures and it is isoelectronic to ozone which is diamagnetic.
October 25, 2009

Chemistry
Which of the following nitrogen oxide molecules and related ions is/are diamagnetic and has/have more than two charge-minimized resonance structures? 1. NO 2. NO2 3. N2O4 4. NO2-
October 25, 2009

Fin
if the price of milk has quadrupled (that is, grown four times) over the past 25 years, what has been the annual rate of inflation in milk price over that time period?
October 22, 2009

biology
nitorgen has an atomic number of 7. which of the following elementshave similair chemical proteries? carbon, neon, phosphorus, or sulfer?
October 12, 2009

chemistry
how to caculate moles with only molarmass
October 10, 2009

economics
After an unexpected increase in the price of oil, the long run adjustment_____ the price level and_____the unemployment rate as they return to original levels. a- decreases, increases b- increases, increases c- increases, decreases d- decreases, decreases a?
October 7, 2009

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