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. 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
4. 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
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. 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
8. 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
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. 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
11. 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
12. 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
13. 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
14. 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

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 16. 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 17. 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 18. 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 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 17, 2011 20. 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 21. 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 22. 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 23. 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 24. english What are the themes in the short story Clothes by Chitra Divakaruni? asked on November 29, 2012 25. math d2y/dx2+9y=cos2x+sin2x asked on July 2, 2014 26. 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 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 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
29. Math(Trigonometry)

kos^2 theta - sin^2 theta = 0.25

asked on February 2, 2013
30. 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
31. 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
32. 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
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. 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
35. 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
36. 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
37. 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
38. 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
39. 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
40. 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
41. 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
42. 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
43. 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
44. 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
45. 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
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

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

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 49. 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
50. 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
51. 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
52. 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
53. math

10+4(m+2)

asked on September 12, 2011
54. 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
55. science

what ph is an acid

asked on November 7, 2012
56. math

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

asked on November 6, 2015
57. math(Trigonometry)

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

asked on February 4, 2013
1. Math

AAA

posted on October 2, 2019
2. friction

posted on August 27, 2019
3. Science

The correct answer is B, trust me.

posted on April 17, 2019
4. educational technology

posted on January 27, 2019
5. Physics

not correct

posted on January 27, 2019
6. 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
7. 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
8. Spanish 1 b

do u guys have geometry a final answers

posted on April 25, 2018
9. Spanish 1 b

Thanks

posted on April 25, 2018
10. Chemistry

36

posted on February 4, 2018
11. physics

ASD

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

dont know

posted on September 21, 2017
13. statistics

288

posted on April 28, 2017
14. 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
15. HIS202

northern states

posted on February 15, 2017
16. 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
17. 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
18. chemistry

4.95

posted on May 13, 2016
19. Physics

aaaaaaaaaaaaaa

posted on February 23, 2016
20. geometry

an arrow pointing up

posted on September 16, 2015
21. chem

3.83 is answer u r certainly close

posted on March 4, 2015
22. Chemistry

0.19M

posted on March 30, 2014
23. Finance

true

posted on January 17, 2014
24. Chemistry

niyyyiiigero

posted on December 11, 2013
25. waste water

2.5

posted on November 25, 2013
26. Quantum physics

How do you get number 6????

posted on September 13, 2013
27. Physics

Thank you so much! Question 10??

posted on June 17, 2013
28. Physics

Please me, question 5

posted on June 17, 2013
29. Physics

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

posted on June 17, 2013
30. Physics

How I can know my denominator watching my grahp BG?

posted on June 17, 2013
31. Physics

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

posted on June 17, 2013
32. Physics

posted on June 17, 2013
33. 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
34. Physics

anyone for question 3 please??????

posted on June 17, 2013
35. Physics

posted on June 17, 2013
36. 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
37. 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
38. Physics

75

posted on February 21, 2013
39. 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
40. Chemistry

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

posted on December 15, 2012
41. chemistry

how can you do this one?

posted on December 15, 2012