Questions Asked on
March 29, 2008

IB Math SL
The triangle ABC is defined by the following information. Vector OA = (2, 3), vector AB = (3, 4), AB and BC are perpendicular, and vector AC is parallel to (0, 1). Draw a diagram of triangle ABC. Write down the vector OC.
asked by Wanda 
Physics
The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries? B) To increase the sound
asked by Amanda 
Algebra II
Use log5(2)=0.4307 and log5(3)=0.6826 to approximate the value of log5=54. According to the example in my book I would divide 0.6826 by 0.4307 and the answer is 1.5848 but this is not one of the answers given. My choices are: a) 0.1370 b) 2.4785 c) 0.8820
asked by Lucy 
Physics
swimming duck paddles the water with it's feet once every 1.6s, producing surface waves with this perios. The duck is moving with constant speed in a pond where the speed of the surface waves is 0.32m/s and the crests of the waves are 0.12m apart. A) What
asked by Amanda 
PHYSICS
A ball of mass 0.150kg is dropped from a height of 1.25m. It rebounds from the floor to reach a height of 0.960m. What impulse was given to the ball by the floor?
asked by JIM 
Physics
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field within the brain. The
asked by Chris Adison 
math
This is an SAT question of the day that I can't understand. The sum of the digits of a threedigit number is 12. If the hundreds digit is 3 times the tens digit and the tens digit is 1 over 2 the units digit, what is the tens digit of the number? Answer
asked by Anonymous 
Physics
A cannon shoots a shell straight up. It reaches its maximum height, 1,051 feet, and splits into two pieces, one weighing 2 lb and the other 4 lb. The two pieces are observed to strike the ground simultaneously. The 4 lb piece hist the ground 1,608 feet
asked by Charlie 
Algebra II
Write the equation log243(81)=4/5 in exponential form. My answer is 243^4/5=81. Evaluate 9^log9(54). My answer is 6. Are these correct?? Thanks
asked by Lucy 
Physics
A cannon shoots a shell straight up. It reaches its maximum height, 837 feet, and splits into two pieces, one weighing 2 lb and the other 5 lb. The two pieces are observed to strike the ground simultaneously. The 5 lb piece hits the ground 1,564 feet away
asked by Charlie 
Physics
Two identical violin strings, when i tune and stretched with the same tension, have a fundamental frequency of 440Hz. One of the strings is retuned by adjusting the tension. When both strings are pluckes simultaneously, after one has been retuned, 1.5
asked by Amanda 
Physics
A cannon shoots a shell straight up. It reaches its maximum height, 1,051 feet, and splits into two pieces, one weighing 2 lb and the other 4 lb. The two pieces are observed to strike the ground simultaneously. The 4 lb piece hist the ground 1,608 feet
asked by Charlie 
Math  explanation
This is an example in the text book. Using vectors, demonstrate that the three points A(5, 1), B(3,4) and C(13,6) are collinear. Solution AB = (8, 5) BC = (16, 10) Then BC = 2AB AB and BC have the opposite direction, so the points A, B, and C must be
asked by Anonymous 
chemistry
1) If the kelvin temperature of a gas sample in a steel tank increases to three times its original value , what will happen to the pressure? I think It will increase. Is this correct? By what factor does the gas pressure change? 2) A gas sample at a
asked by Jason 
Algebra II
Log6(6^9)=??? Answer: 9 Ine^3x=??? Answer: 3x Use log5(2) = 0.4307 and log5(3) = 0.6826 to approximate the value of log5(12) Answer: log5(2) + log5(3)=log5(2^2*3) 2(0.4307) + 0.6826=1.544 so approximate value of log5(12)=1.544 I appreciate your checking
asked by Lucy 
Maths
Many Thanks for your answer
asked by Danial 
Music
What form is the first movement of Mozart Piano Concerto No 21 K. 467 in? Is it sonata allegro? Please someone help me out, I have to write a music paper and I have very little technical expertise in the subject!
asked by Seymour 
physics induced voltage
A Boeing 747 jet with a wingspan of 60.0 m is flying horizontally at a speed of 287 m/s over Phoenix, Arizona, at a location where the Earth's magnetic field is 50.2 µT at 58.0° below the horizontal. What voltage is generated between the wingtips?
asked by Chris Adison 
mathstatistics
18) Which of the following is the most significant result? A) P
asked by Stephanie 
Algebra II
last 2 for tonight Express log6(19) in terms of common logarithms. Then approximate its value to four decimal places. Answer: log19/log6=1.6433 In a certain area, the sale price of new singlefamily homes has increased 4.1% per year since 1992. If a house
asked by Lucy 
chemistry
How can you tell if a compound consists of ions if it does not dissolve in water?
asked by ss 
physics
I keep seeing 7.620497955 as the electrical force between a proton and electron but when I multiply (8.99 x 10^9)(1.602 x 10^19)(1.602 x 10^19)/(10^10)2 I get a diffrent answer. Am I multiplying the wrong numbers?
asked by karla 
Chem
Is this halfreaction H2(g) + 2 OH(aq) ===> 2 H2O(l) = 2 e reduction or oxidation?
asked by Ginger 
Physics
For a LCR circuit Vin = v0*expjwt. Vout is taken across R a) Calculate the impedance of the circuit measured from the input side. Express the impedance in polar form. b) Calculate the gain=Vout/Vin and express the ratio in polar form. c) Sketch the
asked by Sandhya 
12 Chemistry
What is the molar enthalpy of combustion of magnesium? This was the lab question that I was asked to find after performing a lab based on Hess' law. I can't find anywhere in my notes how to calculate this, and the text book doesn't explain their steps
asked by Chase (sorry if this long) 
math
Calculate the magnitude of a when a = (2, 3, 2). Find (1/a)xa. Is it a unit vector. I calculated the a = sqrt17. I don't know how to determine if it's a unit vector or not?
asked by Anonymous 
Algebra
Solve Find (f o g)(6) when f(x)=4x+4 and g(x)=6x^23x6. I originally came up with 918, but the answer is 916. Obviously I was close, but could someone tell how to get 916. I am studying for a test and am reworking my homework problems. Thanks.
asked by Anonymous 
Physics
I don't know if my other post went through or not, so I'm reposting it here. The first question I didn't know the answer to and the second one was worded in a way that I couldn't understand. 1. With respect to an electric and a magnetic field, how does the
asked by Emily 
Math
I am thinking about going back to college and taking online math classes. I am eligible to take either financial mathmatics or contemporary math. But I am not really sure what the difference is between them. Is there one that is more easy than the other?
asked by Matt 
Algebra II
I cannot figure out how to work this one. I have tried working it like the example in the book but cannot come up with one of the answers given. Please help. Use log5(2)=0.4307 and log5(3)=0.6826 to approximate the value of log5=54. According to the book's
asked by Lucy 
French
Could you please tell me if is this correct? "Plusieur des grands magasins de New York ont...." I have read elsewhere that after adverbs of quantity one uses DE; and also that if the (plural) noun is preceded by an adjective one uses DE instead of DES. I
asked by Anonymous 
Math
Can the sum of two unit vectors be a unit vector? Can the difference?
asked by Anonymous 
Vectors
I have a test on monday and I need help with these two questions, please. 1)Prove that the magnitude of the vector OP = (a,b,c) is given by OP = sqrt a^2+b^2+c^2 I understand how to find the magnitude, but I don't know how to prove it. 2)Give a
asked by Anonymous 
Math
Find a single vector equivalent to each expression below. a) 5(0, 2, 4)  4(3,8,0) Please show me all steps so I can understand it.
asked by Anonymous 
social psychology
representation of violence in the media? Qualitative approach: Title abstact brief summary of project  Introduction plus a research questionreview the relevant literature leading up to the research question justify the use of your methodology.
asked by eddie 
Algebra
I don't know which is which y=(x+9)^23 I know it is all real numbers, but i don't know if my answer should be [3,00) or (9,00) Can some one explain this?
asked by Lori 
Algebra II
Solve, round to four decimal places if necessary: log4(x9)=2 Answer: x9=4^2 x9=16 x=11 log4(z)+log4(z3)=1 Answer: z+z3=1 2z=4 z=2 Thanks for checking my work.
asked by Lucy 
Algebra II
Solve, round to 4 decimal places if necessary: 3.9^m4=10.21 Answer: (m4)In(3.9)=In(10.21) m(In3.9)4(In3.9)=In(10.21) m=(In10.21)+4(In3.9)/In3.9 m=7.7672/1.3609 m=5.7074 e^3x>=21 Answer: Ine^3x>=21 3x=In21 x=In21/3 x=1.0148 Thanks
asked by Lucy 
English
I am just curious if you know of any one I could submit an English Essay to. It is less than one page and I need someone to check grammar, spelling etc.... I didn't think this site would accept something like that but was wondering if you know of a website
asked by CJ 
Students and rubrics
How can students be involved in understanding and using rubrics to help with their learning?
asked by Sarah 
secience
describe how at least one fossil fuels and minerals is formed from its sources
asked by tonya 
Algebra II
Please check answers: Use the equation of the exponential function whose graph passes through the points (0,2) and (2,50) to find the value of y when x= 2. My answer: 2/25 Solve 64^x/=5/2 Thanks.
asked by Lucy 
Algebra II
Please check the following: Solve log4(m3)+ log4(m+3) =2 Answer: 1 Solve 6^3n=43^5n4 Answer: 1.1202 Solve 5^2x+1>=50 Answer:x>=4.5000 Use common logarithms to approximate log9(207) to four decimal places. Answer: 2.4270 Ealuate: In e^9x Answer: 9x
asked by Lucy 
Math
Use the cross product to find a vector perpendicular to each of the following pairs of vectors. (2, 1, 3) and (1, 4, 2) Can someone please explain this step by step?
asked by Anonymous 
Scientific notation
what is .020833333 in scientific notation?
asked by Jon 
Algebra II
Solve log2(7x3)>= log2(x+12) My work: 6x=15 x=15/6 x5/2 so my answer would be: x>= 5/2 Is this correct?
asked by Lucy 
Math
If a = 3i + 2j  k and b = 2i + j calculate each magnitude. a) a + b I got sqrt3, but the answer at the back of the book says sqrt11. 2) If D(3,4,5) and E(2,1,5) are points in space calculate each expression and state what it represents. OD can you
asked by Anonymous 
R.E/history
Why did the Romans invade Palestine in the time of Jesus?
asked by Kelly 
physical education
what are sports that is related in turks and caicos island
asked by levonjah 
chemistry
why does a weather balloon get bigger as as it rises from Earth's surface? I don't understand how this relates to "kinetic molecular theory"
asked by Jason 
Math
Find the dot product of the following vectors: a = (4, 1) b = (1,4) a = (7,8) b = (4, 7) You have to find the angle too. Can someone please do these?
asked by Anonymous 
statistics
90% of adults drink milk. A sample of adults in an area was taken. 657 of 750 drink milk. Do these responses provide strong evidence that the 90% figure is not accurate for this region? I figured it out and got the Pvalue to be .028 How do I explain this?
asked by Morgan 
Marketing
T/F Malibu Beach Parties finds that the tastes and preferences of its customers change more rapidly than in the past. The manager is constantly looking for external ideas from customers, suppliers, competition, and the sales force I think this answer is
asked by Jackie 
physics
By "see" I meant that I had checked my answer on the internet to see if I was correct in thinking that multipying the charge of an electron, charge of a proton, and k would yield the electrical force between an electron and proton. My answer was 23.10 x
asked by Karla 
Algebra
How do you solve 3/4 divide by 1/10
asked by Shondell 
research
Could someone help me find reliable websites (not Wikipedia, etc) that explains that ribosomes are membranebound organelles?
asked by Anonymous 
More Music
Okay, so I'm getting the hang of this. Anyway, the first "Theme" of Mozart's 21st Piano Concerto is plain to me. But where does the second begin? And what is it? Again, I have to write a paper on this, and besides a VERY basic, rudimentary comprehension, I
asked by Seymour 
Microecon
Hi, I've got a question about producer surplus. I know that the magnitude of producer surplus would depend on the elasticity of supply, but i don't know why... Please explain. Thank you!
asked by Martin 
Math
Graph the function x if 2
asked by Jimmy 
Physics
Do circular electric lines of force exist ? why? what about magnetic lines of force? Pl help
asked by Sandhya 
Calculus
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the xaxis. y=ln x, y=0, x=1, x=3 Please show the steps in your work, thanks! :)
asked by Pan 
SciencePlease Help!
name two devices that we use on earth, which use the same principles as space capsules. Explain for each one.
asked by Haya 
english
I have to write a 3 page essay on "Is Tradition a Neurosis?" Any ideas please?
asked by Eleanor 
science
need information on patricia ann bianconi background
asked by patty 
law
I was just wondering if someone could give me a little insight on where to begin. You receive an email from your supervisor about her attendance at the upcoming city council meeting to request an increased budget for sex offender rehabilitation programs.
asked by April 
biological psychology
If a Manatee and a Californian Sea lion's Brain are roughly the same size whihc mammel will have a cerebal cortex with a larger surface area and why? How does this reflect the different feeding habits of the mammels? thank you
asked by amy 
Algebra
h(x)=5/x^2+6 I know the answer is: f(x)=x+6, g(x)=5/x^2, but I do not know how to get it. Can someone help me understand it?
asked by Tim 
Algebra II
Simplify: (x^5)(x^pi) Answer: x^5+pi x=8.14 Round to 4 decimal places if necessary: (1/5)^t2 = 125 (5^1)^t2=125 5^t+2=5^3 t+2=3 t=1 t= 1
asked by Lucy 
History
I am making a poster on the cold war. I wanted to make the background look like cracked ice, like on a lake. I thought I could do the whole "cold" thing. I wanted to put a phrase on part of it. Somthing like how they were on thin ice, and close to breaking
asked by Morgan 
arithmetic
I am having a problem with ratio's
asked by KIm 
Rubrics
What are performance indicators? What is the difference between a rubric and a performance indicator?
asked by Sarah