Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 67

**math**

d2y/dx2+9y=cos2x+sin2x

**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

**waste water**

2.5

**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

**Quantum physics**

How do you get number 6????

**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 ...

**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&t...

**Physics**

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

**Physics**

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

**Physics**

Please, Question 3

**Physics**

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

**Physics**

Thank you so much! Question 10??

**Physics**

Please me, question 5

**Physics**

How I can know my denominator watching my grahp BG?

**Physics**

anyone for question 3 please??????

**Physics**

Please, Q10?

**6th grade math**

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

**algebra**

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

**Physics**

75

**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.

**math(Trigonometry)**

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

**Math(Trigonometry)**

kos^2 theta - sin^2 theta = 0.25

**Chemistry**

niyyyiiigero

**chemistry**

how can you do this one?

**Chemistry**

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

**chemistry**

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

**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 ...

**english**

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

**sience**

what ph is an acid

**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

**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?

**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?

**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?

**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.

**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

**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...

**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?

**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?

**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?

**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?

**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 lo...

**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?

**physics**

how to solve it?

**physics**

so what would that last problem be ?

**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...

**chemistry**

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

**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 maximu...

**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 rel...

**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 ...

**Chemistry**

0.19M

**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...

**physics**

thats wrong.

**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 bleacher...

**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...

**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...

**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 i...

**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 ...

**math riddles for 7th grade**

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

**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 tha...

**math **

10+4(m+2)

**Finance**

true

**math**

$3.57?

**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

**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?

**Pre calculus**

x^2+y ^2+ 4x + 6y - 12 = 0 how do i find the domain

**physics**

20

**math **

you should divid 48 by 6

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