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May 1, 2016

# Posts by andy

Total # Posts: 889

math
45/60 = 3/4 numerator/denominator 192=numerator*denominator then its easy enough to just plug in numbers...so find fractions that are equal to 3/4...such as 9/12 12/16 15/20
March 18, 2010

physics
single-slit diffraction pattern is formed when light of 680.0 nm is passed through a narrow slit. The pattern is viewed on a screen placed one meter from the slit. What is the width of the slit (mm) if the width of the central maximum is 2.69 cm?
March 16, 2010

physics
A 17.1 cm focal-length lens is used to project 35 mm slides onto a screen 4.77 m from the projector lens. What must be the width of the screen ( m) if the image of the slide is to just fill the screen? The width of the image on the slide is 34.3 mm.
March 14, 2010

French
I've been working hard on this french composition and I'm afraid I can no longer pick out the mistakes and accurately proofread it. The following composition is on Toulouse Lautrec and Montmartre: Un des plus célèbres post impressionnistes faisait ...
March 7, 2010

math
a few months ago, Van had 100 days to wait until his birthday. His wait is 98% over. Today is Monday. What day is Van's birthday?
March 2, 2010

Corporate Finance
1. The Federal Reserve recently shifted its monetary policy, causing Lasik Vision's WACC to change. Lasik had recently analyzed the project whose cash flows are shown below. However, the CFO wants to reconsider this and all other proposed projects in view of the Fed action...
March 1, 2010

Corporate Finance
1. Langston Labs has an overall (composite) WACC of 10%, which reflects the cost of capital for its average asset. Its assets vary widely in risk, and Langston evaluates low-risk projects with a WACC of 8%, average projects at 10%, and high-risk projects at 12%. The company is...
March 1, 2010

Corporate Finance
19. Fool Proof Software is considering a new project whose data are shown below. The equipment that would be used has a 3-year tax life, and the MACRS rates for such property are 33%, 45%, 15%, and 7% for Years 1 through 4. Revenues and other operating costs are expected to be...
March 1, 2010

Corporate Finance
1. TexMex Products is considering a new salsa whose data are shown below. The equipment that would be used would be depreciated by the straight-line method over its 3-year life, would have zero salvage value, and no new working capital would be required. Revenues and other ...
March 1, 2010

physics
haha thanks bobpursley you are right thats the problem
February 21, 2010

physics
This is a two part question the first part was to find the number of turns which is 535 like you said. L=(mewsub0*N^2*A)/length A= .5 pi r^2 N=number of turns=535 mewsubO= 4 pi 10^-7 thats the formula to use but I'm not getting a correct answer any suggestions?
February 21, 2010

physics
A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness is negligible. what is the inductance per meter(H/m) for the solenoid ...
February 21, 2010

physics
A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness negligible. what is the inductance per meter(H/m) for the solenoid near...
February 21, 2010

Chemistry
Calculate the volume ( L ) of the solute water and the volume ( L ) of the solvent tetrahydrofuran that should be added to generate 4.73 kg of a solution that is 1.36 m water.
February 13, 2010

Chemistry
If 49.6 mL of liquid CS2 and 12.8 g of gaseous Cl2 are reacted stoichiometrically according to the balanced equation, how many moles of liquid S2Cl2 are produced? CS2(l) + 3Cl2(g) ¨ CCl4(l) + S2Cl2(l)
February 12, 2010

Chem
What volume ( L ) of the solute ethanol should be mixed with 0.546 L of the solvent C4H8O to make a solution that is 8.44 m ethanol.
February 12, 2010

Chemistry
Mole of NaBr=(.893M)(.750L)= .6679 mole mole of Cl2= (1.00atm)(22.4L)=n(.0821)(273.15k) n= .998858 mole How do u determine the limiting reagent?
February 12, 2010

Chemistry
If 750 mL of 0.893 M aqueous NaBr and 11.6 L of gaseous Cl2 measured at STP are reacted stoichiometrically according to the balanced equation, how many milliliters of 3.93 M aqueous NaCl are produced? 2NaBr(aq) + Cl2(g) ¨ 2NaCl(aq) + Br2(l)
February 12, 2010

Chemistry
Can anyone please tell me what can you say about the purity of the compound extracted based on your TLC results? Thanks
February 9, 2010

chemistry
Based on the balanced equation C4H8S + 7O2 = 4CO2 + 4H2O + SO2 calculate the number of H2O molecules formed when 39 C4H8S molecules and 287 O2 molecules react?
February 5, 2010

trig
In a diagram of circle, chords AB and CD intersect at E. If AE = 3, EB = 4, CE = x, and ED = x - 4, what is the value of x?
February 1, 2010

trig
A population of wolves in a country is represented by the equation p(t)=80(0.98)^t, where t is the number of years since 1998. Predict the number of wolves in the population in the year 2008.
January 31, 2010

Calculus
I think I am reading this wrong but this may not be a Calculus question. <= means less than or equal to >= means greater than or equal to Rates 20*x 0 < x < 50 20-0.02*x 50 <= x <= 600 When buying 1-49 articles, it is \$20 per article. When buying 50-600 ...
January 27, 2010

algebra
eggs spear a mint
January 27, 2010

Chemistry
Please explain why benzophenone soluble in methyl alcohol. Thanks
January 26, 2010

arithmetic
The progression lists stops on the downtown 1 train in New York. The next number in the sequence is 14, but that's the last numeric stop. Try a real New York high school exam question: Complete the progression: 4,14,34,42,blank, blank.
January 24, 2010

physics
Two charges q = 3.0ì C are fixed in space a distance d = 4.5 cm apart. With V = 0 at infinity, What is the potential energy U of the three-charge configuration when the third charge is in place?
January 23, 2010

physics
PE=mgh
January 23, 2010

physics
2âˆš2...can someone tell me what that expression means
January 23, 2010

physics
haha oh ok thanks
January 21, 2010

physics
Bobpursley thanks for the help I see that Eq/m=a is equal to F/m=a but what vaule do I use for m in this problem
January 21, 2010

physics
A. A uniform, upward-pointing electric field E of magnitude 3.00 10e3 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d = 2.00 cm. An electron is then shot ...
January 21, 2010

Math
y=50-5x x(1)=50-5(1)=45 x(2)=50-5(2)=40 try doing the rest
January 21, 2010

physics
sorry its theta=45 degrees for both questions
January 21, 2010

physics
A. A uniform, upward-pointing electric field E of magnitude 3.00~103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d = 2.00 cm. An electron is then ...
January 21, 2010

chemistry
Molar Mass for ammonia: 17.03 g/mol 1.852 g of ammonia is yield of crude product. 1.852 g ------- = 0.10875 mol 17.03 g/mol 0.10875 mol * 1 L ----- = 0.10875 L mol 0.10875 L * 1000 mL ------- = 108.7 mL 1 L
January 21, 2010

Calculus
line used for square = (40 - x) line used for circle = x Area = (area of square) + (area of circle) Area = (40-x)^2 + (pi*x^2)/4 Area' = (2)(-1)(40-x) + (pi*x)/2 = 0 x = 22.4 Is this max or min? Using x=20 for before the critical point, and x=30 for after the critical ...
January 20, 2010

physics
A. A uniform, upward-pointing electric field E of magnitude 3.00~103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d = 2.00 cm. An electron is then ...
January 20, 2010

MATH213
Calculators usually store more numbers internally than on the screen. Since you get 0.9998941, ask the student to subtract 1 from ANS. (If you don't have an ANS button, you can press the subtraction sign after pressing equal sign for the same effect as pressing "ANS&...
January 20, 2010

MATH213
The font didn't seem to process, so i did it in txt form again: a) sqrt(2*121) = sqrt(121) sqrt(2) = 11*sqrt(2) b) sqrt(144*2) = sqrt(144) sqrt(2) = 12*sqrt(2) c) sqrt(36*10) = 6*sqrt(10) d) not so sure about d... is nroot(162) a typo?
January 20, 2010

MATH213
a) ¡î(2*121) = ¡î121 ¡î2 = 11¡î2 b) ¡î(144*2) = ¡î144 ¡î2 = 12¡î2 c) ¡î(36*10) = 6¡î10 d) not so sure about d... is ©ú¡î a typo?
January 20, 2010

physics
Suppose that the attraction between the moon and the earth were due to Coulomb forces rather than gravitational force. What would be the magnitude of the charge required if equal but opposite charges resided on both earth and moon? Mass of earth = 5.98×1024 kg; mass of ...
January 19, 2010

algebra 2
its "a chew"
January 14, 2010

social studies
i need to write a 4 paragraph criteria essay on compare and contrast buddishm and hinduism on a 6th grade level
January 13, 2010

gr.11 physics help!
When an iceberg floats in the ocean, what fraction of it is visible?( The relative density of ice is 0.92, and hte relative density of sea water is 1.03)
January 6, 2010

what type of language should you use in the invitation for a mechanical engineering professors?
January 6, 2010

Pre-Calculus
The Richtr scale was evied y Cahrles F.Richter a American geologist. The scale is based on the equation M(x)=logx/x0(little 0), where x is the seismographic reading of the earthquake and x0 i 1 miron 0.001mm (the seismographic reading of a zero-level earthuquake) a) Determine ...
December 21, 2009

physics bobpursly help still having trouble
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
December 2, 2009

physics Bob Pursley plz help
ok so I calculate PE when R is (1/1.019)*3.38e6 and then calculate Pe when R is just 3.38e6? Or are you saying multiple (Pe)(1/1.019-1/1)?
November 30, 2009

physics Bob Pursley plz help
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
November 30, 2009

physics
What is the pressure change in water going from a 3.0- cm-diameter pipe to a 1.8- cm-diameter pipe if the velocity in the smaller pipe is 3.0 m/s? Im using the equation pv2^2(A2^2-A1^2)/2A1^2 and get (1000)(3)^2(1.8^2-3^20/(2(3)^2) and get -2880 Pa but I'm getting wrong? ...
November 30, 2009

algebra
to find a percentage you do this X-number given Y-total number (X/Y)*100 so for example (25/50)*100= 50% you can also think of it this way 50*.50=25
November 30, 2009

Physics Meteorite
A satellite in a circular orbit around earth with a radius 1.019 times the mean radius of the earth is hit by an incoming meteorite. A large fragment m=60 kg is ejected in the backwards direction so that it is stationary with respect to the earth and falls directly to the ...
November 30, 2009

Physics 11
A string that is 90cm long with a diameter of 0.75 mm and a tension of 60 N has a frequency of 100 Hz. What new frequency is heard when the length of the string is 100 cm long. Anyone help me please?
November 25, 2009

Physics 11
Can someone give me an accurate definition on "Principle of Superposition"? Extra info: Im studying Physics 11, Sound Unit
November 24, 2009

physics
A wheel initially rotating at an angular speed of 1.2 rad/s turns through 34 revolutions during the time that it is subject to angular accelaration of .4 rad/s/s. How long did the accelaration last? So I used theta=Wot+.5at^2. converted rev to rad. and set it up like a ...
November 18, 2009

physics
A 24 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the cable is 90 degrees and the beam is inclined at an angle of 13.6 degrees with respect to the horizontal. What is the magnitude of the force that the beam...
November 18, 2009

physics entry
A meteor headed straight towards the earth has an approach speed of 2.00e3 m/s at a distance of 7 earth radii from the center of the earth. What will be its speed when it reaches earth a 6.38e6 m(ignore the effects of atmosphere)?
November 17, 2009

physics escape
The escape speed from a distant planet is 42 km/s. If the accelaration of gravity on the planet is 11.0 m/s/s, what is the radius of the planet?
November 17, 2009

Physics 11/Chemistry 11
What is the heating capacity of Zinc?
November 9, 2009

This is my short story essay. I've put some conversations now and then so please take that into account. I would really appreciate if you could fix any mistakes, awkward phrases or even how to make this essay a better writing. Thank You ¡®Honk! Honk! Move out of ...
October 29, 2009

Physics 11
Mark Ji shoots a 40gram arrow straight up in the air at 30m/s during a home archery training session a. assuming no air resistance, what is the maximum height that the arrow could reach? b. How fast is the arrow going when it hits the ceilings at a height of 15.0m?
October 28, 2009

trig
lx - 2l - lx + 2l > x The absolute value of x - 2 minus the absolute value of x + 2 greater than x. What is the Answer Please Help!
October 28, 2009

This is the ruff draft of my speech on environment conservation. I am the first speaker of my group so if I mention some names or awkward ending, it is because of that. Please fix any awkward phrases or mistakes as soon as possible. Thanks Can we achieve both economic growth ...
October 18, 2009

Physics 11
Wow thank you very much!!!!
October 15, 2009

Physics 11
SPH3U1 Two blocks of mass 500.0 g and 200.0 g are suspended vertically as shown in the diagram. The top string is lifted vertically upwards with a force of 8.48N on the 500.0 g Block (sorry no diagram) Thank you very much for your help
October 15, 2009

physics
If an astronaut dropped a small rock near the surface of Pluto, how far (in m) would the rock fall in 1.1 s? (The mass of Pluto is 2.500×10-3 the mass of earth and the radius of Pluto is 0.18 of the earth's radius.)
October 11, 2009

physics
If an astronaut dropped a small rock near the surface of Pluto, how far (in m) would the rock fall in 1.1 s? (The mass of Pluto is 2.500×10-3 the mass of earth and the radius of Pluto is 0.18 of the earth's radius.)
October 11, 2009

Physics
The mass of Venus is 0.8140 times that of earth, and its radius is 0.950 times that of earth. Calculate the acceleration of gravity at the surface of Venus. Express your answer in g's (i.e. as a ratio to our acceleration of gravity). 9.01×10-1 is the correct ratio ...
October 11, 2009

algebra
1/2x-9=11 ADD 9 TO BOTH SIDES: 1/2x=20 DIVIDE BOTH SIDES BY 1/2: x=40 (Dividing a number by 1/2 is the same as multiplying it by 2)
October 10, 2009

This is my essay for the forum that I am attentding in few weeks time. The topic is shown below. Please make any corrections and check any awkward pharses A.S.A.P Thank you Can we balance Economic Growth and Environmental Conservation? Can we balance economic growth and ...
October 3, 2009

Economics
What rate does the FOMC set? Is the the Federal Funds Rate or the Discount Rate?
September 25, 2009

Economics
Who can and who can't vote in the FOMC?
September 25, 2009

maths
one mountain is 5000 ft high and can be reached by cable car from another mountain 7000ft away the other mountain is 3000ft high what is the lenghtof the cableto link the two mountains
September 25, 2009

chem
I see what you are saying but does that answer the whole question of how many NaOH grams will be produced? Because when I made .0522 moles H2 into grams, I got 0.0526 and that is just the grams for H2.
September 21, 2009

chem
Would it just be .222 moles H2O x (1 mole H2/2 moles H2O) because this would cancel the H2O and it would leave me with 0.111 mole H2?
September 21, 2009

chem
ok. 0.0522 moles Na 0.222 moles H2O
September 21, 2009

chem
September 21, 2009

chem
you lost me
September 21, 2009

chem
If 1.2 grams of sodium are reacted with 4.00 mL water, how much NaOH is produced? density of water= 1.00g/mL
September 21, 2009

chemistry
If 1.20 grams of sodium metal are reacted with 4.00mL of water, how many grams of NaOH will be produced (density of water= 1.00g/mL)
September 21, 2009

history during the lives of early people
I need help in how I can approach this assignment,so that I cover all the areas that are to be included and still write an interesting and quality paper, showing the ways of life during this time in history. The assignment reads like this:You are to write a minimum of 1 page ...
September 19, 2009

place value through hundred thousands
What is the expanded form for 417,058
September 15, 2009

physics
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time I've figured out the upward motion part ...
September 12, 2009

physics
ok thanks very much I understand the upward motion part of the problem. I am still have trouble with the downward motion can someone explain. Thanks for the help
September 12, 2009

physics
yes, same person I just dont understand why im getting this problem wrong for a. predict the launch angle. I do tan inverse of 7.87/21.75 giving an angle of 19.9 degrees so I tried subtracting from 180 degrees but im not getting it right either way can you explain please?
September 12, 2009

physics
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time a. what is the correct angle of his launch ...
September 12, 2009

physics
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time a. what is the correct angle of his launch ...
September 11, 2009

physics
A ball is thrown upward from a platform 5.1 meters high with a speed of 13 m/s at an angle 45 degrees from the horizontal. what is the magnitude of its velocity when it hits the ground?
September 11, 2009

This is my history essay (well.. a speech) due in 5 days. Please correct any mistakes or awkward phrases ASAP. Thank You Good morning/afternoon Mr Bean and fellow classmates. Australia, as a country, has a short, yet explicit history since the arrival of European settlers. In ...
September 11, 2009

This is my personal reflective essay. Please fix any mistakes or awkward phrases ASAP My body and my mind became lighter than air around me, as I threw myself on a couch where my back enjoyed being at. Released from the monstrous term of school, I felt saint-like, as if I ...
July 26, 2009

math
A rectangle has area 6 cm (squared) and diagonal of length 2√5 cm. What is its perimeter? thanks
July 15, 2009

history
What effects did the American Antislavery Society have on America?
July 14, 2009

This is my English oral speech. Please check whether there are any mistakes or awkward phrases. Please help ASAP Published in 1974, Where the Sidewalk Ends by Shel Silverstein is a poem which depicts our typical human life. In this poem, he criticises our life full of distress...
June 3, 2009

physics incline
A cord connected at one end to a block which can slide on an inclined plane (incline 27 degrees) has its other end wrapped around a cylinder resting in a depression at the top of the plane (and the other angle at bottom is not a right angle, but 58 degrees). Determine the ...
May 22, 2009

Music
---Okay! I know lots of you out there like music! does anyone know any good Anti-bullying song? Please have a song that will work with the following -Guitarist -Bassist -singer -drummer -violin (optianal) - try to make it a upbeat song Thanks everyone!
May 5, 2009

English
A topic sentence for cooking meals, cleaning the home, shopping and running errands, and providing love and guidance.
April 20, 2009

This is my To Kill a Mockingbird monologue I am doing Nathan Radley. Any suggestions or corrections will be helpful I know what I¡¯m doing Arthur and it is for our own good. I told you many times about staying away from those Finches. Lord, I have. You keep putting ...
March 26, 2009

Remaining essays I had trouble posting my essay in one go. please correct them and any suggestions will be helpful Oh, Leonie, isn¡¯t it hard making contact with other people in this kind of place? Everyone¡¯s enjoying themselves but, I don¡¯t ...
February 25, 2009

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