aaa
Most popular questions and responses by aaa
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 
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 
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 
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 
math riddles for 7th grade
what was the truck driver doing w/a load of hogs
asked on September 13, 2011 
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 
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 
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 
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 
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 
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^210t 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 
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 
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 
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 
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 
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 
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 
science
1283. 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 
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 
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 
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 
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 
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 
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 
english
What are the themes in the short story Clothes by Chitra Divakaruni?
asked on November 29, 2012 
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 
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 
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 
math
d2y/dx2+9y=cos2x+sin2x
asked on July 2, 2014 
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 
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 
chemistry
4.05 g of an unknown gas at 73 °C and 1.00 atm is stored in a 2.25L flask.
asked on December 2, 2012 
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 
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 
math
given the following equations: 2x3y=10 3x=4y=15 which one of the regression equation x on y? show computation
asked on February 17, 2017 
Physics
Light from a coherent monochromatic laser of wavelength λ=2.29e4 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 
Physics
A circuit is composed of a capacitor C=3 μF, two resistors both with resistance R=69 Ohm, an inductor L=6.00e2 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 
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 
physicssss
A mass m = 73 kg slides on a frictionless track that has a drop, followed by a looptheloop 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 
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 
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 
Math(Trigonometry)
kos^2 theta  sin^2 theta = 0.25
asked on February 2, 2013 
math
Beaudoin Haulage has signed a fiveyear 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 
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 
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 
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 
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 
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 
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 
math
10+4(m+2)
asked on September 12, 2011 
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 
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 
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 
math
Can somebody help? A = 0,5x + 4 B = 0,5x + 8 x=? I need x.
asked on November 6, 2015 
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 
math(Trigonometry)
2cos^2 theta + 5 sin theta  4 = 0
asked on February 4, 2013 
science
what ph is an acid
asked on November 7, 2012

Science
The correct answer is B, trust me.
posted on April 17, 2019 
educational technology
yeah its adb
posted on January 27, 2019 
Physics
not correct
posted on January 27, 2019 
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 
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 
Spanish 1 b
do u guys have geometry a final answers
posted on April 25, 2018 
Spanish 1 b
Thanks
posted on April 25, 2018 
Chemistry
36
posted on February 4, 2018 
physics
ASD
posted on October 10, 2017 
Math, calculus III
dont know
posted on September 21, 2017 
statistics
288
posted on April 28, 2017 
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 
HIS202
northern states
posted on February 15, 2017 
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 
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 
chemistry
4.95
posted on May 13, 2016 
Physics
aaaaaaaaaaaaaa
posted on February 23, 2016 
geometry
an arrow pointing up
posted on September 16, 2015 
chem
3.83 is answer u r certainly close
posted on March 4, 2015 
Chemistry
0.19M
posted on March 30, 2014 
Finance
true
posted on January 17, 2014 
Chemistry
niyyyiiigero
posted on December 11, 2013 
waste water
2.5
posted on November 25, 2013 
Quantum physics
How do you get number 6????
posted on September 13, 2013 
Physics
Thank you so much! Question 10??
posted on June 17, 2013 
Physics
Please me, question 5
posted on June 17, 2013 
Physics
7) a) lambda/0.5 b) lambda/0.125 Please question 3, 5, 8
posted on June 17, 2013 
Physics
How I can know my denominator watching my grahp BG?
posted on June 17, 2013 
Physics
b) sigma/(2*epsilon_0)rho*(D d)/(2*epsilon_0) +rho*d/(2*epsilon_0)
posted on June 17, 2013 
Physics
Please, Question 3
posted on June 17, 2013 
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 
Physics
anyone for question 3 please??????
posted on June 17, 2013 
Physics
Please, Q10?
posted on June 17, 2013 
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 
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 
Physics
75
posted on February 21, 2013 
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 
Chemistry
gallium level*10^2) what is this?
posted on December 15, 2012 
chemistry
how can you do this one?
posted on December 15, 2012 
physics
how to solve it?
posted on January 22, 2012 
physics
so what would that last problem be ?
posted on January 22, 2012