# 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

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

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

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

5. ## math riddles for 7th grade

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

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

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?

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

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

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?

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.

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

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

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?

25. ## english

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

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?

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

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

29. ## math

d2y/dx2+9y=cos2x+sin2x

30. ## chemistry

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

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?

32. ## chemistry

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

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

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

35. ## math

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

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

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

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

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

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.

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

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?

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?

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?

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.

10+4(m+2)

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?

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

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.

54. ## math

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

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.

56. ## math(Trigonometry)

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

57. ## science

what ph is an acid

1. ## Science

The correct answer is B, trust me.

posted on April 17, 2019
2. ## educational technology

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

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

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

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

posted on June 17, 2013
33. ## Physics

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

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