Saturday
December 20, 2014

Posts by aaa


Total # Posts: 68

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.
October 1, 2014

math
d2y/dx2+9y=cos2x+sin2x
July 2, 2014

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
May 31, 2014

waste water
2.5
November 23, 2013

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
September 30, 2013

Quantum physics
How do you get number 6????
September 7, 2013

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 plotted ...
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=6.00e-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 "L=x.xx&...
June 17, 2013

Physics
7) a) lambda/0.5 b) lambda/0.125 Please question 3, 5, 8
June 15, 2013

Physics
b) -sigma/(2*epsilon_0)-rho*(D- d)/(2*epsilon_0) +rho*d/(2*epsilon_0)
June 15, 2013

Physics
Please, Question 3
June 15, 2013

Physics
a) (sigma/(2*epsilon_0))-(rho*D/(2*epsilon_0)) c)-sigma/(2*epsilon_0)+(rho*D/(2*epsilon_0))
June 15, 2013

Physics
Thank you so much! Question 10??
June 15, 2013

Physics
Please me, question 5
June 15, 2013

Physics
How I can know my denominator watching my grahp BG?
June 15, 2013

Physics
anyone for question 3 please??????
June 15, 2013

Physics
Please, Q10?
June 15, 2013

6th grade math
type in "square roots" and "practice square roots" into google. click the first link that pops up. :)
May 2, 2013

algebra
why did you multiply it 5, 2, and 10 times? like why is it 35^5, 26^2, and 10^10?
May 2, 2013

Physics
75
February 17, 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.
February 4, 2013

math(Trigonometry)
2cos^2 theta + 5 sin theta - 4 = 0
February 4, 2013

Math(Trigonometry)
kos^2 theta - sin^2 theta = 0.25
February 2, 2013

Chemistry
niyyyiiigero
January 3, 2013

chemistry
how can you do this one?
December 14, 2012

Chemistry
gallium level*10^-2) what is this?
December 14, 2012

chemistry
4.05 g of an unknown gas at 73 °C and 1.00 atm is stored in a 2.25-L flask.
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 rain using industrial ...
November 30, 2012

english
What are the themes in the short story Clothes by Chitra Divakaruni?
November 29, 2012

sience
what ph is an acid
November 7, 2012

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
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?
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?
April 30, 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?
April 30, 2012

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.
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
April 27, 2012

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 order to play A2...
April 19, 2012

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?
April 19, 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?
April 19, 2012

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?
April 11, 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?
February 5, 2012

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? The answer should ...
February 2, 2012

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?
February 2, 2012

physics
how to solve it?
January 22, 2012

physics
so what would that last problem be ?
January 22, 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. .759km/s b) y= .259 km/s...
January 22, 2012

chemistry
a given mass of hydrogen occupies 40.0L at 700 torr. what volume will it occupy at 930 torr
November 17, 2011

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 path? 3)If the ...
October 8, 2011

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 around the loop if ...
October 8, 2011

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 patch a distance d...
October 8, 2011

Chemistry
0.19M
October 2, 2011

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 from the dock at the...
September 21, 2011

physics
thats wrong.
September 19, 2011

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 in the ...
September 19, 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 is the horizontal...
September 17, 2011

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 in the bleachers...
September 17, 2011

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 the ground? 2)What ...
September 17, 2011

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 from the dock at the ...
September 17, 2011

math riddles for 7th grade
what was the truck driver doing w/a load of hogs
September 13, 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 of student tickets ...
September 12, 2011

math
10+4(m+2)
September 12, 2011

Finance
true
December 1, 2010

math
$3.57?
October 10, 2010

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
March 29, 2010

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?
March 29, 2010

Pre calculus
x^2+y ^2+ 4x + 6y - 12 = 0 how do i find the domain
March 26, 2010

physics
20
September 21, 2009

math
you should divid 48 by 6
September 16, 2009

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