aaa

Most popular questions and responses by aaa
  1. physics

    You are traveling on an airplane. The velocity of the plane with respect to the air is 180 m/s due east. The velocity of the air with respect to the ground is 40 m/s at an angle of 30° west of due north. 1)What is the speed of the plane with respect to

    asked on September 17, 2011
  2. physics

    Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 12 m/s at an angle 35 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground. 1)What

    asked on September 17, 2011
  3. probability and statistics

    Let Θ1, Θ2, W1, and W2 be independent standard normal random variables. We obtain two observations, X1=Θ1+W1,X2=Θ1+Θ2+W2. Find the MAP estimate θ^=(θ^1,θ^2) of (Θ1,Θ2) if we observe that X1=1, X2=3. (You will have to solve a system of two linear

    asked on April 1, 2017
  4. physics

    A stone is projected vertically to reach a maximum height 'h'. The ratio of kinetic energy to potential energy at a height 4h/5 is 1) 5:4 2) 4:5 3) 1:4 4) 4:1

    asked on May 31, 2014
  5. math riddles for 7th grade

    what was the truck driver doing w/a load of hogs

    asked on September 13, 2011
  6. Physics

    A hydroxide ion (OH−) in a glass of water has an average speed of about 600 m/s. Determine the magnitude of the electrical force between the hydroxide ion (charge -e) and a positive ion (charge +e) that is 1.0×10−8 m away (about the separation of 30

    asked on January 27, 2019
  7. physics

    what effect did scientists originally think that the intensity of light shining on a photosensitive surface would have on electrons ejected from that surface?

    asked on April 11, 2012
  8. probability and statistics

    For the model X=Θ+W, and under the usual independence and normality assumptions for Θ and W, the mean squared error of the LMS estimator is 1(1/σ02)+(1/σ12), where σ02 and σ12 are the variances of Θ and W, respectively. Suppose now that we change

    asked on April 1, 2017
  9. geometry

    Let the incircle of triangle $ABC$ be tangent to sides $\overline{BC}$, $\overline{AC}$, and $\overline{AB}$ at $D$, $E$, and $F$, respectively. Prove that triangle $DEF$ is acute. I have tried proving that triangle DEF's angles were les than the opposite

    asked on March 17, 2017
  10. pre calculus

    The conic section whose equation is x 2 - 3y 2 - 8x + 12y + 16 = 0, is in Position is I. Is this true or false?

    asked on March 29, 2010
  11. DYNAMICS

    a particle moves on a circular path of 20 ft radius so that its arc distance from a fixed point of the path is given by s= 4 t^2-10t where a is in feet and t is in seconds. compute the total acceleration at the end of 2 sec.

    asked on April 27, 2012
  12. dynamics

    at the bottom of a loop the speed of an airplane is 400 mph. this causes a normal acceleration of 9 g ft/sec^2, determine the radius of the loop

    asked on April 27, 2012
  13. physics

    A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat with speed 24.8 km/hr (with respect to the water) sets off

    asked on September 17, 2011
  14. MATh Methods

    1. The cost of producing x hundred litres of olive oil is 20 + 5x dollars. If the revenue from the sale of x hundred litres of the oil is 1.5x2 dollars, calculate to the nearest litre, the number of litres that must be sold to make a profit of $800. 2. The

    asked on February 21, 2018
  15. physicsssss

    A child is in danger of drowning in the Merimac river. The Merimac river has a current of 3.1 km/hr to the east. The child is 0.6 km from the shore and 2.5 km upstream from the dock. A rescue boat with speed 24.8 km/hr (with respect to the water) sets off

    asked on September 21, 2011
  16. Music Physics

    The clarinet's lowest note is D3, 147 Hz. What is its effective length, that is, the length of an idealized closed pipe that has this frequency for its first mode? Explain why this is less than the actual length of the instrument?

    asked on April 19, 2012
  17. pre calculus

    The conic section whose equation is x^2 - 3y^2 - 8x + 12y + 16 = 0, is in Position is I. Is this statement true or false

    asked on March 29, 2010
  18. science

    12-83. Determine the maximum height on the wall to which the firefighter can project water from the hose, if the speed of the water at the nozzle is 48ft/s

    asked on September 30, 2013
  19. physics

    Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of è = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands

    asked on September 19, 2011
  20. physics

    The mass of 1 cubic meter of air at sea level is about 1.3kg. Hoe much does it weight in newtons? How much would a stack of 8000 such cubes weigh? If this total weight were all applied to an area of 1m^2, how much pressure would it produce on that surface?

    asked on February 2, 2012
  21. Music Physics

    Given that the oboe's lowest note is B flat 3 and its length approximately 64 cm, what length would you expect for the bassoon, whose lowest note is B flat 1? What length for the contrabassoon, lowest note b flat 0?

    asked on April 19, 2012
  22. physics

    Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of è = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away and lands

    asked on September 17, 2011
  23. math

    Payments of $1690 at the end of every six months will pay off the balance owed on a loan in 9.5 years. If the interest rate on the loan is 9.9% compounded semiannually, what is the current balance on the loan? (Do not round intermediate calculations and

    asked on April 9, 2017
  24. physics

    The speed of radio waves is 3*10^8m/s, the same as the speed of light. If a spacecraft transmits a radio signal with frequency 3*10^9Hz, what is the wavelength of those waves?

    asked on February 2, 2012
  25. english

    What are the themes in the short story Clothes by Chitra Divakaruni?

    asked on November 29, 2012
  26. Physics/ Music

    Suppose you make a tape recording of a male voice singing slowly and playing it back at double speed. What will happen to the pitch of each note? What will happen to the formant frequencies of the vowels? Will it merely sound like a woman singing fast?

    asked on April 30, 2012
  27. physicssssss

    A block with mass m = 14 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4545 N/m after being compressed a distance x1 = 0.515 m from the spring’s unstretched length. The floor is frictionless except for a rough

    asked on October 8, 2011
  28. math

    You are a member of a fund raising comittee for your school. The committee is sponsoring a fair. Each member of the committee has agreed to sell 50 tickets to the fair. Student tickets are $3 each and adult tickets are $5 each. Let t represent the number

    asked on September 12, 2011
  29. math

    d2y/dx2+9y=cos2x+sin2x

    asked on July 2, 2014
  30. chemistry

    a given mass of hydrogen occupies 40.0L at 700 torr. what volume will it occupy at 930 torr

    asked on November 17, 2011
  31. physics

    If the string on a violin is 25.4cm long and produces a fundamental tone of frequency of 440Hz, by how much must it be shortened to produce a fundamental tone of frequency of 523.3Hz. is there a specific formula to follow? like, how do you know what to do?

    asked on March 7, 2016
  32. chemistry

    4.05 g of an unknown gas at 73 °C and 1.00 atm is stored in a 2.25-L flask.

    asked on December 2, 2012
  33. PHYSICS

    What causes acid rain? Can you think of a way acid rain could be produced even without industrial pollution? [Hint: Plants produce carbon dioxide, Co2, which reacts with rainwater to produce bicarbonate ions, HCO 3-.] Give one reaction that produces acid

    asked on November 30, 2012
  34. physicsssss

    A mass m = 4 kg hangs on the end of a massless rope L = 2.02 m long. The pendulum is held horizontal and released from rest. 1)How fast is the mass moving at the bottom of its path? 2)What is the magnitude of the tension in the string at the bottom of the

    asked on October 8, 2011
  35. math

    given the following equations: 2x-3y=10 3x=4y=15 which one of the regression equation x on y? show computation

    asked on February 17, 2017
  36. Physics

    Light from a coherent monochromatic laser of wavelength λ=2.29e-4 m is incident on two slits, both of width a, separated by a distance d. The slits are placed a distance L away from a screen where L≫d and L≫a. The diffraction/interference intensity is

    asked on June 17, 2013
  37. Physics

    A circuit is composed of a capacitor C=3 μF, two resistors both with resistance R=69 Ohm, an inductor L=6.00e-2 H, a switch S, and a battery V=25 V. The internal resistance of the battery can be ignored . Reminder: The "L=x.xxenn H" notation means

    asked on June 17, 2013
  38. Music Physic

    The trombone's low B flat 2 is played with the slide in first position. What is its effective length, that is the length of an idealized closed tube with the same second mode frequency? Estimate how far the slide should be moved to reach second position in

    asked on April 19, 2012
  39. physicssss

    A mass m = 73 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 17.9 m and finally a flat straight section at the same height as the center of the loop (17.9 m off the ground). Since the mass would not make it

    asked on October 8, 2011
  40. math

    Monarch Distributing Ltd. plans to accumulate funds for the purchase of a larger warehouse eight years from now. If Monarch contributes $12,000 at the beginning of each month to an investment account earning 4.5% compounded semiannually, what amount will

    asked on April 9, 2017
  41. math

    if one card is drawn from a normal pack of 52 playing cards,what is the probability of getting a king or a heart?

    asked on February 18, 2017
  42. Math(Trigonometry)

    kos^2 theta - sin^2 theta = 0.25

    asked on February 2, 2013
  43. math

    Beaudoin Haulage has signed a five-year lease with GMAC on a new dump truck. Lease payments of $4500 are made at the beginning of each month. To purchase the truck, Beaudoin would have had to borrow funds at 8.7% compounded annually. (Do not round

    asked on April 9, 2017
  44. Math

    The denominator of a certain fraction exceeds the numerator by 1. The reciprocal of the fraction exceeds 3/4 by 7/12. Find the fraction.

    asked on September 7, 2016
  45. Chemistry

    I have a 40 ml solution of pH 4.36. I need to make this solution at pH 8.5 by adding extra 10 ml of HCl and NaOH. Thanks

    asked on August 6, 2012
  46. Chemistry

    I want to make solutions of pH 3.5, 4.5, 6.5, 8.5 and 10.5 from 0.1 M HCl and 0.1 M NaOH. how many ml shall I take from each solution to make these pH levels?

    asked on July 13, 2012
  47. Physics/music

    if you stand at one side os a stage with hard parallel side walls 17m apart and make a handclap, how often do the flutter echoes arrive?

    asked on April 30, 2012
  48. chemistry

    how much NaOH (in grams)do you need to weigh ouMt to make 250ml of a 0.5M naoh solution.... i got 5.0g is this right?

    asked on February 5, 2012
  49. physics

    A meteor streaking through the night sky is located with radar. At point A its coordinates are (5.20km,1.20km), and 1.16s later its has moved to point B with coordinates (6.08km, 0.900km ). a) find the x comonent of it average velocity between A and B.

    asked on January 22, 2012
  50. math

    10+4(m+2)

    asked on September 12, 2011
  51. math

    B owes $3000 due 2 years from today without interest and $2000 with interest at 4% compounded quarterly due in 6 years from today.if money worth is 5% compounded semiannually what single payment made 4 years from today will discharge his debts?

    asked on February 19, 2017
  52. math

    two brothers together owned 1/3 of a small rice mill valued at 1,260.000. One brother owned 3/7 as much as the other. What is the value of each one's share

    asked on September 7, 2016
  53. english

    is evil in humanity a social issue? if not, how can i turn it into one? or is there a social issue that is similar to evil in humanity.

    asked on June 19, 2016
  54. math

    Can somebody help? A = 0,5x + 4 B = 0,5x + 8 x=? I need x.

    asked on November 6, 2015
  55. Chemistry

    To make 1.5 L of 0.1 M NaCl from a 2.52 M stock solution, you would need to take ____ mL of the stock solution and add _____ mL of water.

    asked on October 1, 2014
  56. math(Trigonometry)

    2cos^2 theta + 5 sin theta - 4 = 0

    asked on February 4, 2013
  57. science

    what ph is an acid

    asked on November 7, 2012
  1. Science

    The correct answer is B, trust me.

    posted on April 17, 2019
  2. educational technology

    yeah its adb

    posted on January 27, 2019
  3. Physics

    not correct

    posted on January 27, 2019
  4. freedom similes and metaphors?

    freedom is a gentle breeze np man :D prob wont use it cuz this thread came out on 2011 c;

    posted on April 26, 2018
  5. Spanish 1 b

    Please help I am,bad at geometry and I dont want to fail I have a D

    posted on April 25, 2018
  6. Spanish 1 b

    do u guys have geometry a final answers

    posted on April 25, 2018
  7. Spanish 1 b

    Thanks

    posted on April 25, 2018
  8. Chemistry

    36

    posted on February 4, 2018
  9. physics

    ASD

    posted on October 10, 2017
  10. Math, calculus III

    dont know

    posted on September 21, 2017
  11. statistics

    288

    posted on April 28, 2017
  12. Math HELP! Ms.Sue

    What is the probability of selecting a purple marble and then a white marble? What is the probability of selecting two white marbles? Is there a greater chance of selecting two white marbles in a row or two purple marbles in a row? Show your work.

    posted on February 24, 2017
  13. HIS202

    northern states

    posted on February 15, 2017
  14. Physics

    A charge of 6.0 mC is to be split into two parts that are then separated by 3.00 mm. What is the maximum possible magnitude of the electrostatic force between those two parts?

    posted on January 17, 2017
  15. science HELP ASAP!!!!!!!

    Just so everyone is clear, Smile More is right. Just put in the answers in the order he has them. do not pay attention to eveything above. BECAUSE the questions in the top of this post are in the wrong order, than on the actuall assesment. -Conections

    posted on October 27, 2016
  16. chemistry

    4.95

    posted on May 13, 2016
  17. Physics

    aaaaaaaaaaaaaa

    posted on February 23, 2016
  18. geometry

    an arrow pointing up

    posted on September 16, 2015
  19. chem

    3.83 is answer u r certainly close

    posted on March 4, 2015
  20. Chemistry

    0.19M

    posted on March 30, 2014
  21. Finance

    true

    posted on January 17, 2014
  22. Chemistry

    niyyyiiigero

    posted on December 11, 2013
  23. waste water

    2.5

    posted on November 25, 2013
  24. Quantum physics

    How do you get number 6????

    posted on September 13, 2013
  25. Physics

    Thank you so much! Question 10??

    posted on June 17, 2013
  26. Physics

    Please me, question 5

    posted on June 17, 2013
  27. Physics

    7) a) lambda/0.5 b) lambda/0.125 Please question 3, 5, 8

    posted on June 17, 2013
  28. Physics

    How I can know my denominator watching my grahp BG?

    posted on June 17, 2013
  29. Physics

    b) -sigma/(2*epsilon_0)-rho*(D- d)/(2*epsilon_0) +rho*d/(2*epsilon_0)

    posted on June 17, 2013
  30. Physics

    Please, Question 3

    posted on June 17, 2013
  31. Physics

    a) (sigma/(2*epsilon_0))-(rho*D/(2*epsilon_0)) c)-sigma/(2*epsilon_0)+(rho*D/(2*epsilon_0))

    posted on June 17, 2013
  32. Physics

    anyone for question 3 please??????

    posted on June 17, 2013
  33. Physics

    Please, Q10?

    posted on June 17, 2013
  34. algebra

    why did you multiply it 5, 2, and 10 times? like why is it 35^5, 26^2, and 10^10?

    posted on May 2, 2013
  35. 6th grade math

    type in "square roots" and "practice square roots" into google. click the first link that pops up. :)

    posted on May 2, 2013
  36. Physics

    75

    posted on February 21, 2013
  37. math(Trigonometry)

    can give me a further and detail explanation where did the theta on the 5 and the formula on changing the cos theta.

    posted on February 4, 2013
  38. Chemistry

    gallium level*10^-2) what is this?

    posted on December 15, 2012
  39. chemistry

    how can you do this one?

    posted on December 15, 2012
  40. physics

    how to solve it?

    posted on January 22, 2012
  41. physics

    so what would that last problem be ?

    posted on January 22, 2012