Wednesday
October 1, 2014

Posts by Amanda


Total # Posts: 1,700

Chemistry
Three isotopes of Argon occur naturally: 36Ar (mass = 35.9675 amu) 38Ar (mass = 37.9627 amu) 40Ar (mass = 39.9624 amu) If the percent abundance of 36Ar is 0.3400, what is the percent abundance of 40Ar?
September 24, 2014

GEM Math
7 rows of 8 and 12 rows of 8
September 2, 2014

Physics
A curve in a road 8m wide has a radius of 60 m. How much higher than its inner edge should be the other edge of the road be if it is to be bunked properly at 20 km/hr?
August 31, 2014

child development part 2
When preparing an environment for school - aged children, the caregiver should ensure that the
August 29, 2014

Physical Science
you should end up with an answer close to 2400cm3
August 23, 2014

algebra I
A water balloon is dropped from a rooftop that is 40 feet tall. How long will it take to fall to the ground? Round to the nearest tenth and include units.
August 14, 2014

Question?
Sue I think that do to it takes a man or woman to produce stereo type talk
August 10, 2014

Question?
do you think gender roles are produced by gender stereotypes, or vice versa? I personally feel that gender roles produce gender stereotypes . What do you think
August 10, 2014

psychology (check answer)
Adolescent women are most likely to use contraception: a. During their first experience of sexual intercourse. My answers is A b. If they already have one baby. c. If they have been involved in a steady relationship. d. If they have just met their sexual partners.
August 7, 2014

Human Sexuality
Diseases most frequently found to have adverse effects on sexual functioning include all of the following EXCEPT: a. Multiple sclerosis or stroke. b. Diabetes, cardiovascular disease, and heart attacks. c. Arthritis. d. Asthma.
August 7, 2014

Math
Two boats are approaching the same dock. Boat A measures 37° from boat B to the dock. Boat B measures 68° from boat A to the dock. What is the angle the boats make with the dock?
June 12, 2014

Chemistry
1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...
May 20, 2014

Chemistry
No.
May 20, 2014

Chemistry
1. Sugar can be dissolved in water because of the presence of bonds between _______ in its molecule. 2. If the maximum amount of a compound that can dissolve in 100 mL of water is 22 g, then a solution of 20 g of that substance in 100 mL of water is said to be _______. 3. A ...
May 20, 2014

algebra
7-|m-1|=3
May 15, 2014

math
A plumber charges a flat $50 for a home service call plus $10 per 15 minutes of labour. Write an equation for calculating the total charges, C, in terms of the hours of labour, H. If you were to plot a graph of C vs. H, what would be the slope and C-intercept of the line?
May 2, 2014

Chemistry
Just two more to check, thanks! 1) The pH of a 1.25 M solution of unknown monoprotic acid is 5.43. Determine the value of Ka for this acid. HX <--> H+ + X-. (I obtain 1.0 x 10^-11) 2) Calculate the pH of a solution which is 0.73 M benzoic acid. Ka = 6.5 x 10-5, HC7H5O2 &...
May 1, 2014

Chemistry
Right. I typed it correctly, so it's definitely a typo on the worksheet. Thanks for pointing that out. I used 4.4 x 10^-4 for Kb, per my textbook. Thanks for checking!
May 1, 2014

Chemistry
1) Which ion(s) below would undergo hydrolysis in water? A) Cl- B) K+ C) NH4+ D) NO3- E) Two of the above My guess is C, but I'm not too sure about this one. 2) Calculate the [OH-] present in solution labeled 1.73 M methylamine. CH3NH3 + H2O --> CH3NH3+ + OH-. I get 2....
May 1, 2014

Physics- HELP PLEASE:)
I've tried: #4.) ¢V=IR convert to I=¢V/Rseries Rseries= R1 + R2+ R3 which is 2+2+2=6. then I took I=9V divided by6. so I=1.5V....( get 3 tries on online homework, it said 1.5 isn't right, and im not sure what I had done wrong.) #5.) I did 1/...
April 30, 2014

Physics- HELP PLEASE:)
4.) Three 20-Ù resistors are connected in series to a 9-V battery. What is the voltage difference across each resistor? 5.) Three resistors of 5 Ù, 10 Ù, and 2 Ù are connected in parallel with one another. What is the equivalent resistance of this ...
April 30, 2014

Chemistry - check answers
1) Which of the following sets is arranged according to increasing base strength? A) F-, OH-, Cl- B) F-, Cl-, OH- C) OH-, F-, Cl- D) OH-, Cl-, F- E) Cl-, F-, OH- (my answer) 2) What is the pH of a solution formed by adding 4.3 x 10^-5 moles of KOH in 1 L of water? A) 4.3 x 10...
April 30, 2014

Chemistry
1) In the reaction NaOH + H2O --> Na+ + OH-, sodium hydroxide is the: A) Lewis acid B) Brønsted-Lowry acid C) Arrhenius base D) Amphoteric substance E) None of the above (I think it's C) 2) The conjugate acid of the sulfide ion is: A) S^2- B) HS- C) H2S D) H3S+ E...
April 29, 2014

physics
so E=v/d E=.03/3 E=.01?
April 28, 2014

physics
The electric potential increases from 10 V to 70 V from the bottom plate to the top plate of a parallel-plate capacitor. We are going to move a charge of +5 x 10-4 C from the bottom plate to the top plate. What is the magnitude of the change in potential energy of this charge...
April 28, 2014

physics
so... E=.03J/3m=0.01J/m??
April 28, 2014

physics
In the previous problem (Question 4), if the distance between the two plates of the capacitor is 3 cm, what is the magnitude of the uniform electric field between the two plates?
April 28, 2014

physics
The electric potential increases from 10 V to 70 V from the bottom plate to the top plate of a parallel-plate capacitor. We are going to move a charge of +5 x 10-4 C from the bottom plate to the top plate. What is the magnitude of the change in potential energy of this charge...
April 28, 2014

physics
0.15j-0.05j=0.1 0.1=__*2x10^-6c 0.1/2x10^-6c=___ 50000=__ so answer 50000j/c?
April 28, 2014

physics
The potential energy of a +2 x 10-6 C charge decreases from 0.15 J to 0.05 J when it is moved from point A to point B. What is the change in electric potential between these two points? Do not enter any (-) sign in your answer.
April 28, 2014

physics
9v*4c=36J??
April 28, 2014

physics
A total charge of +4 C flows from the +9 V positive terminal of a battery to the negative terminal at 0 V. What is the change in potential energy of the charge?
April 28, 2014

physics
thank you. my professor gave us a change in GPE=mgh and a E=Fe/q equations and was confused
April 28, 2014

physics
30J*?
April 28, 2014

physics
45J, correct?
April 28, 2014

physics
how do you figure out change in V? is it 10v- 70v? then times it by .5c and get the change in PE??
April 28, 2014

physics
so ... change in PE=.5 times 10v? sorry my professor didn't cover what C or V equations are
April 28, 2014

physics
A charge of +0.5 C is moved from a position where the electric potential is 10 V to a position where the electric potential is 70 V. What is the the change in potential energy of the charge associated with this change in position?
April 28, 2014

algebra
Suppose that a box has a base with a width of x, a length of x+3, and a height of 1 inch. It is cut from a square sheet of material with an area of 130 in2. Find the dimensions of the box.
April 25, 2014

Chemistry
The equilibrium constant is 16 for the gas phase reaction SO2 + NO2 <--> SO3 + NO at a certain temperature. If 3.0 moles each of SO2 and NO2 are placed together in an empty 1.0 liter flask and the system is allowed to come to equilibrium at this temperature, what will be...
April 20, 2014

Chemistry - check answer
Great, thanks!
April 20, 2014

Chemistry - check answer
A 20.0 L reaction vessel contains 0.016 moles CO2, 1.05 moles of CO, and 2.00 moles of C. The mixture is approaching the following equilibrium: CO2(g) + C(s) <--> 2CO(g) a) Calculate the reaction quotient Q. b) If value of K is 1.17, predict which direction the reaction ...
April 20, 2014

Chemistry
A flask was immersed in 350 g of water at 25 degrees C. Steam at 100 degrees C was passed into this flask, and eventually condensed into water at 100 degrees C. If the temperature of the water surrounding the flask was raised to 70 degrees C, how many grams of steam must have ...
April 18, 2014

Stats Class
Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rate by subway riders are uniformly distributed between 5 and 50 ...
April 11, 2014

Physics
What is the critical angle (in degrees) for a ray of light coming from a medium with an index of refraction of 1.4 to a medium with an index of refraction of 1.2? label the unit.
April 7, 2014

Physics
A fish swimming in a pond looks up at a dragonfly flying 45 cm above the surface of the water. How far does the dragonfly appear to the fish if the indices of refraction of water and air are 1.33 and 1, respectively? Enter your answer in cm.
April 7, 2014

physics
A string with a length of 1.3 m is fixed at both ends. What is the longest possible wavelength for a standing wave on this string?
March 31, 2014

Chemistry
How many milliliters of 0.242 M NaOH are required to exactly titrate 18.0 grams of H2C2O4?
March 26, 2014

Physics
A wave can be propagated on a rope by holding one end of the rope and moving your hand up and down. The resulting wave is: A)neither transverse nor longitudinal. B)both transverse and longitudinal C)longitudinal D)transverse
March 24, 2014

Physics
A railroad car with a mass of 12000 kg collides and couples with a second car of mass 18000 kg that is initially at rest. The first car is moving with a speed of 9 m/s before collision. If external forces can be ignored, what is the final speed of the two railroad cars after ...
March 24, 2014

Physics
A 5-kg ball is at rest when it is struck head-on by a 2-kg ball moving along a track at 10 m/s. If the 2-kg ball is at rest after the collision, what is the speed of the 5-kg ball after the collision?
March 24, 2014

Calc Help :(((((
find the derivative of: (1/3)^(x^2) i got ln(1/3)*(1/3)^(x^2)*(2x) but the answer is supposed to be the negative of that.. where does the negative come in?
March 24, 2014

statistics
help
March 23, 2014

Chemistry - check answers
Got it. Thanks a lot!
March 22, 2014

Chemistry - check answers
Would D) be correct for 3?
March 22, 2014

Chemistry - check answers
1) Which element has the largest first ionization energy? A) Rb, B) Fr, C) K, D) Na, E) Mg Answer: E 2) Which has the highest electronegativity? A) Na, B) Cs, C) Si, D) Te, E) Cl Answer: E 3) In which of the following are the bonds arranged in order of increasing polarity? A) ...
March 22, 2014

english
Choose the sentence that has a subject complement. A. The day ended with many surprises. B. I felt much better. C. The nurse felt my pulse. D. We can't leave without seeing I think it's B.
March 21, 2014

CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
March 20, 2014

Calc Help :(((((
is the square root in parenthesis within the ln? on one side it is and on the other its not
March 20, 2014

math 1 question pls help!!!!!
ok so i think i get it, volume is width*length*depth so dividing the known volume by its width gives you the length*depth. after that set up a porportion: (L*W)of known/92 = x/46 solve for x gives you the length*depth of the unknown volume, times that but the 46 width.. i got ...
March 20, 2014

CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
March 19, 2014

Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
March 19, 2014

Rate Law - Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
March 19, 2014

Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
March 19, 2014

English??
I am writing a recommendation paper on the type of medication to treat ADD/ADHD.. does anyone have an interesting idea for a title?? maybe something joke-ish? i cant think of anything and my teacher said it has to be something to 'draw the audience in'
March 19, 2014

Chemistry
these are (p*v)/t problems p=pressure v=volume t=temperature (in kelvin) it doesnt mention pressures in these problems so we assume it remains constant. the problems should be set up as: (Volume of initial)/(temp. of initial) = (volume of final)/(temp. of final) plug in and ...
March 19, 2014

Chemistry
A 247 lb fullback runs the 40 yd dash at a speed of 17.09 ± 0.1 mi/h. (a) What is his de Broglie wavelength (in meters)? (b) What is the uncertainty in his position? ** I found part A but I am unsure how to use this information to get part B. Any help is appreciated :)
March 11, 2014

Physics
A truck and a bicycle are moving side by side with the same velocity. Which, if either, will require the larger impulse to bring it to a stop? a) The bicycle. b) The truck. c) Both will need the same impulse. d) There is not enough information to determine the answer.
March 10, 2014

Physics
The frequency of oscillation of a pendulum is 7 Hz. What is the period of oscillation?
March 10, 2014

Physics
A ball traveling with an initial momentum of 2.5 kg*m/s bounces off a wall and comes back in the opposite direction with a momentum of -2.5 kg*m/s. What impulse would be required to produce this change?
March 10, 2014

physics
1. A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55 North or West and applies full power?
March 5, 2014

math
how do you do this problem h=2A/b1+b2 solve for b1
March 3, 2014

English
I m doing an analysis question on a poem called Question by May Swenson. The question says: Describe the prosody of the poem and comment on the effect of the initial substitutions of the meter. I do not even know where to start with this question, if you could help me out please.
March 2, 2014

Chemistry (Thermodynamics)
Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ?
February 27, 2014

Math
Nevermind, I understand!
February 24, 2014

Math
i'm not sure what you mean by up 10 and over thirty?
February 24, 2014

Math
Two poles are 20 feet tall and 30 feet tall, respectively. If they are 30 feet apart, how far is it from the top of one pole to the top of the other pole? Round your answer to the nearest tenth of a foot.
February 24, 2014

College Physics
A very long wire carries an I1 = 7.80 A current along the x axis and another long wire carries an I2 = 5.13 A current along the y axis. (I2 is directed upward on the y axis, and I1 is directed to the right on the x axis) What is the magnetic field at point P located at x = 4....
February 23, 2014

Chemistry - check answers
Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when ...
February 23, 2014

Physic
A large rock with a mass of 38.2 kg is rolling at a speed of 4.8 m/s. How much power is needed to stop the rock in 7.2 seconds?
February 21, 2014

Personal Dimensions of Education
are
February 16, 2014

Physics
Whats the diameter of the sphere?
February 14, 2014

Physics
In a laboratory experiment, one end of a horizontal string is tied to a support while the other end passes over a frictionless pulley and is tied to a 2.6kg sphere. Students determine the frequencies of standing waves on the horizontal segment of the string, then they raise a ...
February 14, 2014

Chemistry
Got it, thanks!
February 12, 2014

Chemistry
Exactly 1.0 mole of oxygen and 7.0 moles of nitrogen gas are in a container. The total gas pressure is 5.7 atm. What is the partial pressure of nitrogen in atm? I'm not sure how to go about setting up the problem. Any help is appreciated!
February 12, 2014

Data apps and healthcare statistics
what are the categories of information systems, examples of each and their roles in the healthcare delivery
February 9, 2014

Chemistry
I wanted to make sure I knew the correct states. Thanks a lot for your help!
February 8, 2014

Chemistry
Write the chemical formula and number of ions formed when the following electrolyte dissolves in water. Make sure to include appropriate states. K3PO4 = ??? Any help with this is greatly appreciated!
February 8, 2014

LA
1.)1 2.)3 3.)2 4.)1
February 6, 2014

physics
A beach ball, moving with a speed of +1.28 m/s rolls off a pier and hits the water a horizontal distance of 0.74 m from the end of the pier. How high (magnitude only) above the water is the pie?
February 4, 2014

PHY
It is said that unlike charges attract. You should have observed that after the sticky side of a piece of scotch tape is pulled quickly off the smooth side of another piece of tape the tapes attract each other. Perhaps each tape has the same type of charge and the rule has ...
January 31, 2014

ap chemistry
a 0.76 mol sample of pcl5 is placed in a 500 ml reaction vessel. what is the concentration of pcl5 when the reaction pcl5(g) ⇀↽ pcl3(g) + cl2(g) has reached equilibrium at 250◦c (when kc = 1.8)
January 31, 2014

AP Chem
Predict whether the equilibria I) CO(g) + H2O(g) ⇀↽ CO2(g) + H2(g), ∆H ◦ = −41 kJ II) X2(g) ⇀↽ 2 X(g), where X is a halogen will shift toward products or reactants with a temperature increase.
January 31, 2014

CERT IV in allied health
Yes, what change could one suggest?
January 30, 2014

CERT IV in allied health
Make one suggestin to change workpractice in allied health facility How would you encourage team members to have positive attitude to the change you are suggesting?
January 30, 2014

SAT
Get you English up to the mark first before you attempt any tests.
January 30, 2014

Data Management
Expectation is that you'll be left with 0.8 cents, use a proability distribution chart to help you.
January 21, 2014

World History
What is the connection between Czar Nicholas II, mobilization, and WWI?
January 13, 2014

Algebra 2
Trying to help my daughter with her homework and im not sure how to do quadratic equations... Her question is X2(squared)+6=0 Im so lost!
January 13, 2014

Math
"You have been asked to help build a rectangular play area at the new Tracy elementary school. You arrive at the site eager to begin! Much to your surprise, the only things available to work with are two pieces of rope. Explain how you can use the rope to find the ...
December 20, 2013

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