Posts by abby

Total # Posts: 1,140

Physics
it is π (pi)

Physics
Suppose Fuzzy, a quantum mechanical duck, lives in a world in which h = 2 J.s. Fuzzy has a mass of 2.0 kg and is initially known to be within a region 1.0 m wide. a) What is the minimum uncertainty in his speed? b) Assuming this uncertainty in speed to prevail for 5.0 ...

Physics
Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the electrons passing through ...

Physics
An air rifle is used to shoot 1.0 g particles at 100 m/s through a hole of diameter 2.0 mm. How far from the rifle must an observer be to see the beam spread by 1.0 cm because of the uncertainty principle? Compare this answer with the diameter of the universe (  1026 m).

Physics
To what voltages must we accelerate electrons (as in an electron microscope, for example) if we wish to resolve; a) a virus of diameter 12 nm , b) an atom of 0.12 nm, c) a proton of diameter 1.2 fm?

Physics
Electrons in a beam incident on a crystal at an angle of 300 have kinetic energies ranging from zero to a maximum of 5500 eV. The crystal has a grating space d=0.5A0, and the reflected electrons are passed through a slit .Find the velocities of the electrons passing through ...

math
6x48,7x47,8x46,9x45,10x44,11x43,12x42

Physics
Two converging lenses with focal lengths 5 cm and 30 cm are placed 35 cm apart. Rays from a very distant object are impinged on the lens system parallel to the principal axis. What is the refractive power of the combination of these two lenses?

Pre Calc
Thanks so much guys!!!!

Pre Calc
tan(x)=5 sin(x) for interval -π < x < π A) 0, 1.571 B) -1.571, 0, 1.571 C) -1.369, 0, 1.369 D) 0, 1.369

geometry
A guy wire is attached to the top of a 75 meter tower & meets the ground at a 65 degree angle. How long is the wire?

Math
tan(x)=5 sin(x) for interval -π < x < π

Physics
A photon of energy E strikes an electron at rest undergoes pair production, producing a positive electron(positron) and an electron, photon+electron produce positron+electron+electron The two electrons and the positron move off with identical momenta in the direction of the ...

Physics
The temperature of your skin is approximately 35C degrees. What is the wavelength at which the peak occurs in the radiation emitted from your skin?

chemistry
you must prepare 300 mL of .750M NaBr solution using 2M NaBr stock solustion. how many mL of stock solution should you use?

apples
Is the saying "an apple a day keeps the doctor away" true?

Etymology
Thankyou!

Etymology
I am doing a project on Fascinating Etymology Stories and was wondering if you guys know of any good websites with interesting stories of the origin of words, preferrably not words that came from a persons name. Thanks:)

etymology
how did wrigley come up the orbit. not the actually product but i need to know the orgin of the product name orbit. thanks:)

chem
Determine the volume of 0.240 M KOH solution required to neutralize each of the following samples of sulfuric acid. The neutralization reaction is shown below. H2SO4(aq) + 2 KOH(aq)--> K2SO4(aq) + 2 H2O(l) (a) 26 mL of 0.240 M H2SO4 thanks

science
determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

chemistry
Calculate the molarity of each of the following solutions. 1. 61.9 g of C2H6O in 3.4 L of solution

this is soooooooooooooo BORING

History
If you could summarize the fighting in the Soviet Union between 1941 and 1944 into one sentence what would you say??

child day care management,health,safety,and nutrit
which of the following are the three major types of knowledge identified by piaget

physical
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 142-kg laser sensor that measures the thickness of the ice (see the drawing). The helicopter and the sensor both move only in the horizontal direction and have a horizontal acceleration of ...

Chemistry
Kinetic energy is calculated from the formula KE = (1/2)mv2. Suppose a mass of 14.2 kg (m = 14.2 kg) is moving with a velocity of 750. ms-1 (v = 750. meters per second). Calculate the kinetic energy of this mass in units of Joules.

Physics
This is a conservation of angular momentum problem. Now, the formula for angular momentum is: L = Iw So basically, L before = L after: I1w1 = I2w2 The trick to solving these is to figure out what the change in moment of inertia is, and then apply the concept of conservation of...

science
if an astraunout could jump 40 cm on jupiter how high could he ir she jump on earth how about the moon also????? pleese help me im stuck on this question

Math
Thanks Ms. Sue

Math
\$260

Math
Lyla deposited \$250 in an account earning 4% simple interest. At the end on one year, how much was in the account, assuming no more deposits or withdrawals?

Math symbols
thank you!!!! :) :) :)

Math symbols
thanks and do you know what "*" means in math?

Math symbols
What does * mean in math? thanks for ur help Abby

statistics
Scores on the ACT test are normally distributed with a mean of 21.1 and a standard deviation of 4.8. If one ACT score is randomly selected, find the probability that it is greater than 20.

physics
how much work is being done if a 100 N box is lifted 3 meters off the ground???

I am doing a battle chart in history class the I need to know who won the Gonzales battle Also i need the mexican leader and the texas leader and who won on in the battle of the concepcion and where the goliad battle took place and when it took place also i need all the grass ...

math
what multiplication fact could you use to find a number that can be divided evenly by 8 and by 9

math
If the volume of the ball is 288 pic cubic inches, what is the diameter of the ball?

us history
I need help finding information about the Industrial revolution. How it impacted American society economically, socially, politically, and morally. This needs to be a 500 word essay. Thanks for the help! :)

Physics HELP!
how is this equation right? when i multiplied all those numbers to get T1 i got a huge number...to plug it back in for T2 i would get a negative number...

physical science with earth science
Write a balanced chemical equation for the reaction for propane C3H8 burning in oxygen to for carbon dioxide and water vapor

math
880

science
A place or object used for comparion to determine whether something is in motion is called what?

math
60

I don't understand constant rate of change can you give me some examples. The graph I have shows the depth of the water in a vase over 8 days

social studies

math
61 devided by 6039

Science
if it takes 20 newtons to accelerate an object weighing 15 kg 0.1 meters per second squared to the west what is the force of kinetic friction?

math
A circular racetrack has a diameter of 200 meters. What is the approximate distance a car travels in meters for three full revolutions around the track? use 3.14 for pie.

trig
sin(pi/3)

world issues- amazon deforestation
I just need like facts on ways to stop deforestation. -_-

world issues- amazon deforestation

world issues- amazon deforestation
Hi. I was assigned an essay that I have to get done by 2morrow. It is about Amazon rainforest deforestation. I have to sum everything up into 3 paragraphs. 1st paragraph- tell what's happening here; I already did this. 2nd & 3rd paragraphs- describe how you would stop ...

Math
Nope

Math
Rae runds a mile 20 times. Her average time is 5.2 mins. She wants to drop her slowest time 5.8 mins and find the ew average. Write and equation to find are her new average running time

Maybe you should just make it as math instead of 8th grade. I suggest you post it agin.

math
Originally priced at \$35 now on sale for 25% what proportion could you do to find d the discount of the price

Math
Originally priced ar 35 dollars now on sale for 25% find an proportion to find d. d/35 = 25/100

An Important Fact About YOU! Worksheet.

math
jared spent 76 dollars in june. In july he spent 1/5 more money than he did in june which procedure can be used to determine the money he spent in july add 1/5 abd 75 multiply 1/5 abd 75 then add 75 multiply 1/5 and 75 divide 1/5 by 75 then subtact the result fron 75

Pre-algebra

Pre-algebra
So 7t = -98. What is t?

english
If direct exposition means direct characterization, then true. Characterization is how the author helps you find out the personality traits of a character. Let's say if the story read; Yang was a very nice child from China. This would be DIRECT characterization. If the ...

english
Are you trying to ask if this is a correct sentence? If that is your question, than yes, it is a correct sentence. Only you need capitalization.

J=31-q or 31-q=J

Social Studies
WOW! That is ALOT of information!

algebra
Thank you I just didn't know if it was supposed to be a negative number or not. My math that I have is really confusing.

algebra
12 - 3b = what? for b = 4.3

algebra
a lot lot lot lot lot lot lot lot lot lot lot LOT!!! That is probably too big of a number to say.

french
check ending of tu form. Monica is intelligent. What is feminine adjective ending?

physics
Need equation: Mass of 4.24 kg acted on by external force that reduces velocity from 8.5 m/sec to 4.1 m/sec in 3.0 sec. Find magnitude of the retarding force?

physics
Mouse steals piece of cheese by rolling across the floor with a force of 5.0 N. With what acceleration does the cheese move? At what speed is the cheese rolling after 10 seconds?

Spanish 1
34. What's the opposite of alli. 36. Is lapiz masculine or feminine? Notice you are working with UN boligrafo.

All you have to do to turn a fraction into a decimal is divide the numerator by the denominator. 5 divided by 8 = 0.625.

math
a bicycle rider left town at noon at traveled at a uniform rate of 15 miles an hour. at 2 pm the same day, a motorcycle rider left for the same place at a uniform rate 30 miles an hour higher. at what time did the motorcycle rider overtake the bicycle rider?

science
Mexico is actually the leading producer of silver followed by U.S., Canada, Australia, Spain, Peru, and lastly, Russia. Hope this helps Abby

enviroment
i have this quetion and answer thing and i am having troubles with the meanings can anyone help me?

algebra
Awesome! Thanks

algebra
If there was a problem like this: 2yx for y=8 and x=5, you would write it like this: 2(8)(5). Which do you multiply first? 8x5 then x2 or 2x8 then x5?

science
Yes. It will help us because it is an renewble energy souce. that is what I think.

Science
Should we use biomass?

242

math Trig
find each ratio to 3 decimal places cot245degrees sec74degrees how do i do this?

Social Studies
Idunno

Spanish
sorry, I meant sentEnce.

Spanish
It mens where are you from. Dónde means where, and eres means you are. Put those in a scentance and it asks a question.

math
What is it......it is......????????????????!!!!!!!!!.

Wow this is a hard one.

the answer would be 50 because if he wants to be rounding to the nearest 10 then that's what it would be

math
2/24 1/4

Calculus ll - Volumes
No, actually. It is y=1. I sketched out the solid of the equations, and I believe it's a washer.

Calculus ll - Volumes
Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. y=e^(-x), y=1, x=2; about y=2.

math
it is spelled like this eight million, forty-two thousand, one hundred seventy-six.

H. Physics
A plane travels 2.5 km at an angle of 35 degrees to the ground and then changes direction and travels 5.2 km at an angle of 22 degrees to the ground. what is the magnitude and direction of the plane's total displacement?

while flying over the grand canyon, the pilot slows the plane down to one-half the velocity in item 3. If the wind's velocity is still 75 km/h toward the southeast, what will the plane's new resultant velocity be?

A roller coaster moves horizontally, then travels 45 m at an angle of 30 degrees above the horizontal. What is its displacement from its starting point?

is in goverment

A&P
___________are usually attached to rough endoplasmic reticulum and produce enzymes and other protein componds.

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