# Posts by Kyle

Total # Posts: 1,122

**math 7th**

+2 -10

**history**

hi i need a lot of sources about the history of throwing coins into fountains

**Physics**

A student wants to run an experiment to determine how the distribution of mass (location of mass) affects an object`s rotational velocity. For this experiment the student picks 3 rings. One is a wood ring (like a hula-hoop) with all of its mass at the outer edge (A). The next ...

**Calculating Vapor Pressure**

The vapor pressure of nitrogen at several different temperatures is shown below. Temperature (K) Pressure (Torr) 65 130.5 70 289.5 75 570.8 80 1028 85 1718 1. Use the data to determine the heat of vaporization of nitrogen in kJ/mol. 2.Determine the normal boiling point of ...

**heat of vaporization**

Suppose that 1.00 g of rubbing alcohol (C3H8O) evaporates from a 54.0 g aluminum block. If the aluminum block is initially at 25 C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the ...

**physics**

5. K =5 J since the only force acting on it is gravity, it's a conservative force. That means the energy is only transferred from U to KE and never lost. We use the formula: E= U + KE At its max displacement, KE=0 and E must equal U. It says that at its max displacement U=...

**S.S.**

What is an Assyrian Library?

**math**

write an equation in point-slope form for the line through the given point with the given slope (4, -6); m = 3 over 5

**Earth Science**

Broad areas of folded rock layers that resemble a bowl turned right-side up are called

**Chemistry**

sorry. Determine the molar mass of the unknown acid. Determine the molecular formula of this acid.

**Chemistry**

Determine the molar mass of the unknown acid.? A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.

**Chemistry**

Determine the molar mass of the unknown acid.? A 0.167-g sample of an unknown acid requires 27.8 mL of 0.100 M NaOH to titrate to the equivalence point. Elemental analysis of the acid gives the following percentages by mass: 40.00% C; 6.71% H; 53.29% O.

**Physics**

bobpursley forgot to put the second mass in the equation. whenever there is a v^2/r , remember to multiply it by mass. tension[low] = mg + (v^2/r * m) tension[high] = (v^2/r * m) - mg

**Lattice Energy**

Arrange the following substances in order of decreasing magnitude of lattice energy. KCl NaF SrO BaO

**Business Maths**

idk

**physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?

**physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.3 m/s?

**biology**

how are babies made?

**math**

Use two points on any horizontal line to illustrate why a horizontal line has a slope of 0...I'm really confused. Can anyone answer with an explanation?

**de Broglie Wavelength**

The presence of oxygen atoms on the surface results in auger electrons with a kinetic energy of approximately 505 eV. What is the de Broglie wavelength of this electron? [KE= (1/2)mv^2; 1 electron volt (eV) = 1.602*10^-19 J]

**Chemistry**

Water is exposed to infrared radiation of wavelength 3.0×10^−4 cm. Assume that all the radiation is absorbed and converted to heat. How many photons will be required to raise the temperature of 1.7 g of water by 2.2 K?

**Heat of Formation**

0.04319 moles F3O4 Specific Heat Constant: 4.18 J/mol*C

**Heat of Formation**

I got 1518 kJ/mol using that equation, but I still got it wrong. Did I do something wrong?

**Heat of Formation**

When 10.00 g of iron is burned in O2(g)to form Fe3O4 (s) , enough heat is generated to raise the temperature of 784 g of water from 18.0 C to 38.0 C. Calculate the heat of formation of Fe3O4 (s) under these conditions in kJ/mol.

**Chemistry Equations**

What's the equation for the formation of NO2(g) from its elements in its standard states? What's the equation for the formation of BF3(g) from its elements in its standard states? What's the equation for the formation of C2H5OH(l) from its elements in its standard ...

**12th grade Physics**

Hi, actually Bob, your answer is not 30 degrees, but 60 degrees. 30 degrees does not refer to the angle inside the triangle formed by the x and y components.

**math**

Depending on where you place the parentheses either problem could be correct, but you must use the parentheses to clarify how the problem should be done.

**Thermochemistry**

w is work

**Thermochemistry**

Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial speed of 4.5 m/s. As it travels, it loses some of its energy as heat. The ball slows down to 3.5 m/s and then collides straight-on with a second billiard ball of equal mass. The first billiard ball ...

**chemistry**

Predict the mass of gold formed when a gold (III) nitrate solution reacts completely with 125 mL of 0.352 mol/L sulfurous acid (aqueous hydrogen sulfite)

**Reaction Stiochiometry Involving Gases**

Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the following set of equations: CF3Cl + UV Light ---> CF3 + Cl Cl + O3 ---> ClO + O2 O3 + UV Light ---> O2 + O ClO + O ----> Cl + O2 What total volume of ozone measured at a pressure of 25.0 ...

**Kinetic Molecular Theory**

A sample of N2O effuses from a container in 48 seconds. How long would it take the same amount of gaseous I2 to effuse from the same container under identical conditions?

**Chemistry**

You wish to make a 0.200 M solution of NiSO4 (aq). How many grams of NiSO4 * 6H2O should you put in a 0.500 L volumetric flask? The answer is 26.3 g NiSO4 * 6H20 but I am not sure how to get there.

**9th grade**

I need an answer to my question in spanish Que vas a hacer despues de las clases hoy?

**Spanish**

Need an answer in Spanish to a spanish question! Que vas a hacer despues de las clases hoy?

**Chemistry**

A solution contains Cr+3 ion and Mg+2 ion. The addition of 1.00 L of 1.55 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 49.8 g. Find the mass of Cr+3 in the original solution.

**Organic Chemistry**

ahh I got it the C5 and O need to be double bonded

**Organic Chemistry**

oh thank you but when I tried it seems there is another structure in which all atoms have their octet

**Organic Chemistry**

like this? img198.imageshack .us/img198/7855/trialt.jpg

**Organic Chemistry**

img17.imageshack .us/img17/6517/cycloo.jpg

**Organic Chemistry**

I do have a picture but I can't show the url well I believe its a cyclopentdiene the number is going from the right the 1 is a oxygen and the 3 is CH+ and the double bond is located between 4 and 5

**Organic Chemistry**

ahh it didn't show o / \ \\ / -CH+

**Organic Chemistry**

ahh it didn't show

**Organic Chemistry**

Draw the most important resonance contributor of the following structure? I'm confused on this one o / \ double bond -> \\ / - CH+

**Physics**

Atomic physicists ignore the effect of gravity within an atom. To see why, Calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10^-10 m.

**science**

how it is

**History**

What do think I'll learn by interviewing a teacher about their school? Here are the questions I asked the teacher: Kearsney is the name of the school Where and when were you born? How would you describe your childhood? What was your ambition growing up? What did you study ...

**History**

What questions could you ask a person about there life story if you had to interview them?

**History**

Can someone please help me make a biography of a person about there old high school? Ok I'm interviewing a person about his life at his old high school. I've split it into 4 steps. Introduction Transcript Conclusion Introduction: It should be a life story of the ...

**social studies**

after the 1800's what type of manufacturing was chicago know for?

**capitalization**

New Year's day occurs on January the first. Numbers under 100 need to be written out.

**capitalization**

Yes this is right.

**capitalization**

John Grisam is the author of "The Street Lawyer."

**Algebra**

How do you do this? Which binomial is a fctor of 3x^2+2^x-5? A: 3x-1 B: x-1 C: 3x-5 D: x-5 I know you tried to help but it wasn't right but thanks.

**Algebra**

Which binomial is a factor of 3x^2+2x-5?

**physics**

an object held in the air has a gpe of 470 J. the object then is dropped. halfway down, what is the objects kinetic energy?

**Physics**

A cube of ice weighing 18 grams sublimes into vapor. How many liters of gas will you get?

**Physics**

A tall glass (20cm) is floating in your bathtub. It weighs 60 grams and has a bottom area of 10cm^2. How deep will it sink into the water, while it is still empty and how much water can you add to make it sink?

**to kill a mockingbird**

what new things dose scout learn here about how the black people live

**spanish to english**

do you mean like soccer and basketbal

**spanish to english**

dos deportes que necesitan bola a pelota son

**Physics**

A
serving
of
cereal
has
800
cal
(1
cal
=
.239
J).
How
far
can
you
walk
with
this
energy?
Is
the
elapsed
time
...

**science**

how do you find the wet bulb depression if they don't give any other info.

**history**

so would it be C

**history**

A.Southerners D. urban political machines B.Suburbanites E. labor C.Blacks I think it is D

**history**

the choices are A. Southerners D. urban political machines B. Suburbanites E. labor C. Blacks I think it is D

**history**

Franklin Roosevelt put together a coalition of different groups that became the backbone of the Democratic Party for the next thirty years. FDR’s Democratic Party coalition included all of the following EXCEPT A. Southerners B. urban political machines C. Suburbanites D. ...

**physics**

On average, the electron and proton in a hydrogen atom are separated by a distance of (5.3 x 10 -11 m), assuming the orbit of the electron to be circular, (a) what is the electric force on the electron? and (b) WHat is the electrons orbital speed? and (c) What is the magnitude...

**4th grade**

I have a hard analogy question for homework. I have to answer the following: Ship is to trip as shout is to.......

**Data Management**

The length of sunfish in Grenadier pond are normally distributed with a mean of 15cm. Find the standar deviation to one decimal place. If 91% of these fish have a length less than 17.7 cm.

**Data Mangement help**

Find the variance if X~N(0.02) and 95% of the data lies between -7 and 7.

**Data Management**

How many of the 250 perch netted by a fisherman would you expect to have a mass more than 400g if the mass of the perch are normally distributed with a mean of 300g and a standard deviation of 80g.

**FRACTION SUBTRATION MATH**

Subtracting a Fraction From 1 Joe Jumped robe for 3 minutes and 24 seconds. How many seconds is three minutes and 24 seconds. I can figure this out but have no clue how to turn it into a fraction subtraction problem...Can't remember. Thanks!

**algebra 1**

that wasn't it i'm so confused

**algebra 1**

i was thinking step 3,5,2,1,4 but it said i was wrong

**algebra 1**

ELEMENTARY ALGEBRA #3 Page 23 Chapter 3 Lesson 3.02 Solving Multi-step Equations Reading Assignment: Study pages 126 – 129 Written Assignment: There are five steps to solve Multi-Step equations, Match them in their proper order. Step 1 Undo multiplication or division ...

**Social Studies**

What type of political system is headed by Queen Elizabeth II of England?

**Chem**

A particular household ammonia solution ( d= 0.97 ) is 6.8% NH3 by mass How many milliliters of this solution should be diluted with water to produce 600 ml of a solution pH= 11.65?

**chemistry**

Which of the following statements is NOT true in regards to water, ethanol, and isopropanol? A. H-O-H and C-O-H bond angles are all equal to 1095. B. Two lone pairs of electrons are assigned to the oxygen in each Lewis structure of all three molecules. C. Dispersion forces ...

**Chemistry**

Hexane is a hydrocarbon (a molecule containing only carbon and hydrogen) with a molecular weight of 86.18 g/mol, a density of 0.660 g/mL, and a boiling point of 69C. Pentanol is an alcohol (a hydrocarbon with a "OH" group attached to one of its carbons) with a ...

**geometry**

how do i fid the surface are for this shape??? HELP!

**DR BOB???**

x=1 subtract x from both side. divide 3x.

**Chemistry**

I am making a NaCl solution. What are the steps in calculating and weighing out NaCl for a 4 M solution.

**math**

What formula is this? (x1+x2/2, y1+y2/2)?

**5th Grade Math**

14.75

**Calculus**

Solve for the function y. dy/dx = xe^y, when y(1)=0 I got as far as: e^-y dy = x dx But then how do you continue from there?

**Physics**

A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A2 = 0.0600 m2. The gas has a density of ñ = 1.70 kg/m3. The Venturi meter has a ...

**physics**

no the radius is not given. The question i posted is all i have to work with.

**physics**

The second hand on a watch has a length of 4.50 mm and makes one revolution in 60.00 s. What is the speed of the end of the second hand as it moves in uniform circular motion? I just need some help getting started

**Physics**

A bowling ball encounters a 0.76 m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. If the translational speed of the ball is 5.40 m/s at the bottom of the rise, ...

**Physics**

(a) Calculate the kinetic energy that the earth has because of its rotation about its own axis. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States in one year is about 9.33e9 Joules...

**physics**

A race car, starting from rest, travels around a circular turn of radius 29.3 m. At a certain instant, the car is still accelerating, and its angular speed is 0.621 rad/s. At this time, the total acceleration (centripetal plus tangential) makes an angle of 35.0° with ...

**american government**

how can a governors message power affect legislation in a state

**american government**

a police officer has arrested a suspect and produced evidence of wrongdoing. list three questions you would ask the officer to determine whether the freedom and security of the suspect have been violated

**american government**

a police officer has arrested a suspect and produced evidence of wrongdoing. list three questions you would ask the officer to determine whether the freedom and security of the suspect have been violated

**american government**

is it flase

**american government**

the powerful but unofficial post of president of the senate involves steering floor action to a party benefit. is true or flase im not sure

**Chem**

What is the quantity of heat evolved when 111.9 grams of H2O(l) is formed from the combustion of H2(g) and O2(g)? H2(g) + 1/2 O2(g) --> H2O(l) Delta Ho = -285.8 kJ A. -0.4 kJ B. 1776.7 kJ C. 0.4 kJ D. -1776.7 kJ E. -6.2 kJ

**Chem**

When 0.0500 moles of HCL is reacted with 0.0500 moles of NaOH in 50.0 mL of water, the temperature of the water increases by 13.7 degrees C. Caclulate the heat for this reaction in terms of joules per mole of HCl. The heat capacity of the system is 209.2 joules per degree ...

**AP World History**

thesis on India and china?