noel
Most popular questions and responses by noel
Health & PE One Question PLEASE ANSWER!
For drivers over 21 years of age DWI or DUI is defined as a. A BAC of 0.08 or higher b. A BAC of 0.10 or higher c. A BAC of 0.20 or higher d. any amount of alcohol in the blood Thanks!
asked on March 20, 2015 
chemistry
If 0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 1012 and respectively.
asked on January 16, 2011 
chemistry
Calculate the pH of a 0.800 M NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is
asked on January 16, 2011 
Chemistry
0.10 M potassium chromate is slowly added to a solution containing 0.50 M AgNO3 and 0.50 M Ba(NO3)2. What is the Ag+ concentration when BaCrO4 just starts to precipitate? The Ksp for Ag2CrO4 and BaCrO4 are 1.1 x 1012 and respectively.
asked on January 16, 2011 
chemistry
What is the oxidation number of PO4 in the compound Ca3(PO4)2? how do you get it?
asked on July 21, 2010 
gen chem
use the rydberg equation to calculate the wavelength in A of the photon absorbed when a hydrogen atom undergoes a transition from n=7 to n=9
asked on November 26, 2014 
Math
In traingle DEF, DE=18m and EF=6m. Side FD maybe
asked on May 24, 2019 
MATHS
experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year?
asked on September 26, 2014 
Chemistry
Given the balanced equation: a. Fe2O3+3C=2Fe+3CO: b. How many moles of Fe are produced when 1.36 moles of carbon monoxide are produced? c. How many grams of Fe is part b equal to? d. how many molecules of Fe are in part B
asked on October 8, 2012 
HISTORY
Does this sentence make any sense and is it accurate? The Soviet Union, however, rejected the Marshall Plan due to the belief that they could not keep a close eye on the satellite states in the Eastern bloc and that the West was trying to enforce their
asked on April 24, 2007 
physics
If 0.055 kg of ice at 0 ∘C is added to 0.330 kg of water at 32 ∘C in a 0.100kg aluminum calorimeter cup, what is the final temperature of the water?
asked on November 27, 2015 
Chemistry
A flask partially full of liquid water is heated to boiling and capped cold water is poured over the flask. The water boils even more vigorously explain
asked on April 11, 2011 
Math/Algebra
In the school election, votes were cast for Sam, Mary, and Bill in the ratio of 4:3:2. If a total of 2,178 votes were cast, how many votes did Mary receive?
asked on April 15, 2016 
Physics
A car of mass 1390 kg rests on a hydraulic lift with a piston of radius 0.26 m that is connected to a second piston of radius 0.033 m. If the car is just barely lifted off the ground, what is the force at the second piston? I Tried F1/F2 = r1^2 / r2^2 ==>
asked on November 20, 2015 
science
Ammonia gas can be prepared by the reaction of a metal oxide such as calcium oxide with ammonium chloride. CaO(s) + 2 NH4Cl(s) 2 NH3(g) + H2O(g) + CaCl2(s) If 199 g of CaO and 300. g of NH4Cl are mixed, what mass of NH3can be produced?
asked on September 16, 2010 
Physics
When a 0.50 kgobject is attached to a vertically supported spring, it stretches 0.10 m from the equilibrium position. Find k for the spring.
asked on February 22, 2012 
physics
Calculate the frequency in hertz, wavelength in nm, and the velocity in m/s of light inside a material with a refractive index of 1.39. In vacuum, the light has a wavelength of 514.5nm
asked on April 5, 2011 
Science 1 question
A researcher, studying dolphins in the wild, made the following sketch. Each dot on the map represents one dolphin. The area surveyed by the scientist was 1 km ^2. Based on the researcher's data, how many dolphins would you estimate to be in a 3 km ^2
asked on September 29, 2015 
math
If the sum of first n term is 1600,and the common different is 2 while the 1st term is 1.find n?
asked on June 10, 2015 
Social Studies (Check Answers Please!)
HELP: PART 1 1. What was the result of the 1995 referendum held in Quebec? A. Quebec separated from Canada* B. French became the official language of Canada C. Quebec's people voted to remain part of Canada D. Quebec became part of France 2. Early Spanish,
asked on March 18, 2015 
MATHS
please help me ...Experiments show that radium at rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year ??
asked on September 26, 2014 
physical chemistry
find the ph of the solution that results from the addition of 25ml of 0.1mol/l NaOH solution to 50ml of 0.1mol/l HCL solution?
asked on April 26, 2011 
HISTORY...
What is the EU (European Union)? Was is successful? Why or why not? The EU now consists of most countries of Europe. It started out as the "Common Market" following World War II and kept growing. It is very successful. More countries are eager to join. The
asked on April 24, 2007 
Physics
A crate of mass 40 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 14 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between
asked on October 16, 2015 
Chemistry
what would be the effect on a chromatographic peak of introducing the sample at too slow a rate
asked on January 31, 2011 
chemistry
A piece of metal weighing 26g is immersed in a quantity of water in a graduated cylinder. The initial volume of the water was 16.0 ml and volume of water plus metal is 22.0 ml. The density of metal in g/ml is? If you get this right i will hand you over my
asked on July 21, 2010 
social studies
What were some common ideas shared by the first colonists in each of the New England, Middle, and Southern Colonies?
asked on September 27, 2018 
math
Simplify each of the following: 1. 16*(2^x)+2 2. 3[sqrt(x^1/4)*sqrt(x)/5*sqrt(x^2)] 3. ab^(2x+y)/a^x b^x
asked on May 28, 2012 
Statistics
A distribution of test scores of 600 examinees follows a normal distriburion with an everage of 80 having a standard deviation 12, how many examinees would you expect to find above a score of 100?
asked on February 5, 2016 
SS please check and help
What different reasons did the European nations have for exploration? Provide at least one example specific to Spain, France, and Britain. Where did Spain, France, and Britain choose to settle while exploring? Why did they settle these particular areas? MY
asked on September 28, 2015 
chemistry
A buffer with a pH of 4.30 contains 0.25 M of sodium benzoate and 0.20 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.052 mol of HCl to a final volume of 1.5 L? I know that Ka = 6.3x105 do I need to use an ice
asked on April 11, 2015 
Math (please help!)
1. θ is a first quadrant angle in standard position and cos 1/(sqrt10)= . Find the exact value of sin . 2. feta is a second quadrant angle in standard position and tan(feta) ((sqrt5)/2) = . Find the exact value of cos(feta) . 3. θ is an angle in
asked on June 11, 2012 
calculus(integral)
intergral 2x^2/(x^2+4x+8)
asked on February 11, 2012 
chemistry
calculate the rms speeds of He at 10, 100, and 1000 K in meters per second and in miles per hour. What values would be otained if the pressure was 10^10 bar
asked on January 23, 2011 
trigonometric identities
Prove the following trigonometric identities 1. tanx = sinx + sin^2x/cosx(1+sinx) 2. cos^3+(cosx)(sin^2x) = 1/secx
asked on June 22, 2012 
physics
Given x(t) = xm cos 2ðt/T for a spring with constant k and attached mass m sketch as a function of t, (a) the displacement x, (b) the velocity v, (c) the acceleration.
asked on February 22, 2012 
chemistry
the work done by the system during a certain adiabatic process is 200J. What is the change in U of the system
asked on February 6, 2011 
chemistry
calculate the pressure (in Pascals and bar) of 10^23 gas particles each with a mass of 10^25 kg, in a 1 L container if the rms speed is 100m/s? What is the total kinetic energy of these particles? What is the temperature inside the container
asked on January 22, 2011 
chemistry
calculate the pressure in Pa and bar of 10^23 gas particles each with a mass of 10^25 kg, in a 1 liter container if the rms speed is 100m/s
asked on January 22, 2011 
Biometrics II
If these samples were drawn from a population with mean male weight of 180 and mean female weight of 165, what is the probability that the difference between the mean male and female weights would lie between 4.5 and 27.8?
asked on February 25, 2007 
Biometrics
If these samples were drawn from a population with mean male weight of 180 and mean female weight of 165, what is the probability that the difference between the mean male and female weights would be greater than the observed sample? (The sample means are
asked on February 25, 2007 
Math
Tanø(secø+2)
asked on March 2, 2017 
Math
Each homeroom of a middle school receives 1/12 acre plot of 5/6 acre of land. How many classrooms receive a plot of land. 5/6 divided by 4840 is this correct
asked on September 26, 2016 
Math
On a map with a scale of 1:100m, what is the actual area of a land in hectares if it is 180 sq.m on the map?
asked on August 20, 2016 
math
a tray with a square base is to be made from a square piece of cardboard by cutting 5 inch squares from each corner and folding up the sides. If the box is to hold a volume 520 cubic inches, find the length of the piece of cardboard that is needed.
asked on March 11, 2015 
trig
Determine the period, amplitude and phase shift for each given function: A)y = 4 cos 3x + 5 B)y = 2/3 sin (30x90degrees)10 c)y = 0.38 tan (x/3+pi/3) d)y = pi cos(2x)+ pi
asked on August 12, 2012 
dependance of a man on the enviroment
How do deforestation and urban sprawl affect the greater food web?
asked on January 28, 2012 
statistics
what is the 4σ rule of thumb in statistics
asked on January 25, 2011 
history
hey coould anyone tell me is the title lord in the 1700's england was compatible with involvement in the royal navy?
asked on September 17, 2009 
Computers
How would you test an objectoriented design’s sequence diagrams? Be specific.
asked on October 22, 2008 
geometry
ok, so i don't understand this question. : which postulate justifies the following statement? "exactly one plane contains
asked on October 21, 2007 
History
What's the difference between COMECON and COMINIFORM? Thanks in advance! http://en.wikipedia.org/wiki/Comecon http://en.wikipedia.org/wiki/Cominform
asked on April 24, 2007 
Physics
A tennis ball is dropped from 1.54 m above the ground. It rebounds to a height of 0.845 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s^2 . (Let down be negative.) Answer in units of m/s.
asked on November 17, 2015 
history
ways nonMuslims were treated in the Islamic world?
asked on July 13, 2014 
math
Find opxthe volume of a rectangular box 9 feet by 7.1 feet by 7 feet.
asked on September 1, 2013 
TRIGONOMETRY
Suppose tan theta=15pi/18 is less than theta 3pi/2 , what are the other trigonometric functions?
asked on July 9, 2013 
math (please double check my answers)
Simplify the following using the laws of exponents: Need help with these: a) (9)^1/2 x 4^2/24 b) 16 x 2^x+2 Simplify each of the following: b) b) 3 sqrt x^1/4 sqrt x/ 5 sqrt x^2 c) (ab)^2x+y /a^x b^y Need these answers double checked: c) 3^8/3^6 x 3^5
asked on May 27, 2012 
math
5. Find the slope of the secant to the curve f(x) = 0.25(4)^x  2 between: i) x = 0 and x = 1 ii) x = 0 and x = 0.5 iii) x = 0 and x = 0.1 iv) x = 0 and x = 0.01
asked on May 27, 2012 
math
7. Determine the inverse of each relation given. a. f(x) = 1/x2 + 3 b. f(x) = 2(x – 4)^2 + 5
asked on May 24, 2012 
Math (need formula)
I would be very appreciative if someone could provide me with the formula I would use to plug these figures into a graph. 3. A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the
asked on May 16, 2012 
mind and machine
What figure from the history of philosophy section do you think might have some views that are similar, or at least relevant, to your own?
asked on August 24, 2011 
physics
Quartz has a refractive index of 1.54. If light from a HeNe laser impinges on an air/quartz interface at an angle of 22.5 degrees, what is the angle of refraction?
asked on April 6, 2011 
chemistry
if PV=RT + ἁP where ἁ is a constant Calculate the work if the gas is heated at constant pressure from T1 to T2 Calculate the work if the gas is expanded isothermally and reversibly
asked on February 2, 2011 
chemistry
how would the graph of Pressure vs Volume look for a sample of an ideal gas that has a volume of 1 L at 0 degrees Celsius and 1 bar. How would the graph of Pressure versus volume look for sample of gas at the same conditions but at 100 degrees Celsius?
asked on January 25, 2011 
Maths
How do I work out square roots without a calculator?
asked on August 28, 2009 
If...=, find...
If h(x)=3/(2x+1), find h^1(x)
asked on July 27, 2009 
prealgebra
how do i identify the slope snd yintercept of the graph of each equation. Then graph the equation? plz help asap!
asked on February 26, 2009 
1st grade math please help!!!
8...
asked on April 24, 2007

maths
7kg
posted on July 22, 2019 
Math
How do you find the finance charge?
posted on October 19, 2018 
Physics
the weight of the displaced water is more than the weight of the cubic solid of plastic
posted on July 18, 2017 
SS please check and help
Okay... I think I get it now. Thank you SO much! :)
posted on September 28, 2015 
SS please check and help
I'm still really confused.
posted on September 28, 2015 
SS please check and help
Also, on this one I am stumped: Select two groups of Native American people from two different areas within the United States. The areas you can select from include the North, West, Southwest, Plains, and East/Southeast. Explain how environmental factors
posted on September 28, 2015 
Health & PE One Question PLEASE ANSWER!
Ok... So please do
posted on March 20, 2015 
Health & PE One Question PLEASE ANSWER!
Okay, 2 more questions sorry The state in which a person's ability to function mentally or physically is impaired is called a. a hangover b. a blackout c. intoxication d. a coma Another term for alcohol poisoning is a. hangover b. blackout c. intoxication
posted on March 20, 2015 
Social Studies (Check Answers Please!)
Hi Reed, What are the answers to 1 and 2 then?
posted on March 18, 2015 
Social Studies (Check Answers Please!)
HELP: PART 2 1. One way that European settlement changed the lives of the native peoples in the Plains region was by A. Exposing them to new diseases* B. Building schools for their children C. Giving them free land D. Teaching them how to farm their land
posted on March 18, 2015 
history
middle east, late 1300's1700's
posted on July 13, 2014 
Math (please help!)
feta = β
posted on June 11, 2012 
math
It's f(x) = .25(4^x)  2 Thank you!
posted on May 28, 2012 
chemistry
But the problem didn't give temperature that is qhat confused me
posted on January 23, 2011 
math
base figures you need to know 5280 feet in a mile 12 inches in a foot 60 minutes in an hour The circumference of a circle formula is circumference = pi * radius * 2 the trick of this problem is you have feet in the mile but inches in the tire & hours in
posted on March 30, 2010 
math
to answer this question you need to know the formula for the circumference of a circle is: circumference = pi * 2r and a circle is 360 degrees. so the length of the arc is what fraction of the whole circle? and that fraction times the above circumference
posted on March 30, 2010 
math
g) 30 = 30 * .25 + (30+10) * .10 30 * .25 + 40 * .10 7.50 + 4.10 11.50
posted on February 25, 2010 
religion
his death itself wasn't the point. It was his ressurection. God poured the wrath meant for sinners on the only substitute possible, his son. he died, and payed the price on the cross as he died. but he was ressurectred after 3 days, so anyone who trusts in
posted on September 17, 2009 
religion
he wasn't fully human he was human and fully God. he came as a human to absorb the wrath God had to use to punish sin. Jesus did that for all who trust in him and his grace. otherwise...
posted on September 17, 2009 
math riddle ALGEBRA WITH PIZZAZZ
O'lay ,like that company that does hair shampoos or O'lay at a bull fight :) Si' hablo españole'
posted on September 16, 2009 
Chemistry
Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or no shift in the direction of the net reaction. N2(g)+ O2(g)=2NO(g)
posted on March 25, 2009