Posts by Amanda
Total # Posts: 2,621

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 ... 
Physics
A 5kg ball is at rest when it is struck headon by a 2kg ball moving along a track at 10 m/s. If the 2kg ball is at rest after the collision, what is the speed of the 5kg ball after the collision? 
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? 
Chemistry  check answers
Got it. Thanks a lot! 
Chemistry  check answers
Would D) be correct for 3? 
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) ... 
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. 
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... 
Calc Help :(((((
is the square root in parenthesis within the ln? on one side it is and on the other its not 
math 1 question pls help!!!!!
All of your answers are totally wrong! 
math 1 question pls help!!!!!
All of your answers arw to play wrong! 
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 ... 
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... 
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... 
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... 
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... 
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 jokeish? i cant think of anything and my teacher said it has to be something to 'draw the audience in' 
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 ... 
Maths,Tourism, science, Economics
For three courses can able to do after grade 12 
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 :) 
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. 
Physics
The frequency of oscillation of a pendulum is 7 Hz. What is the period of oscillation? 
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? 
PreAlgebra
Helping hand is correct 100% 
Global Studies (Please help)
im behind in my social studies and i would like to give a special thanks to eveyone here for helping, to any more future people the answers are infat a, d, a but you already know that, so ill be going i guess :) 
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? 
Science Check Please :)
Ok so #1 is correct but.... 2 and 3 are incorrect in my opinon. Photosynthesis produces glucose and oxygen which are the starting materials for cellular respiration and cellular respiration produces carbon dioxide and water, the starting materials used in photosynthesis. for #... 
math
how do you do this problem h=2A/b1+b2 solve for b1 
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. 
Chemistry (Thermodynamics)
Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ? 
Math
Nevermind, I understand! 
Math
i'm not sure what you mean by up 10 and over thirty? 
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. 
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.... 
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 ... 
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? 
Personal Dimensions of Education
are 
Physics
arcsin(.178/1.19)=8.603 
Physics
Whats the diameter of the sphere? 
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 ... 
S.S
is it colorado? 
Chemistry
Got it, thanks! 
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! 
Data apps and healthcare statistics
what are the categories of information systems, examples of each and their roles in the healthcare delivery 
Chemistry
I wanted to make sure I knew the correct states. Thanks a lot for your help! 
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! 
Science
d,b,b,c,a these are the answers to that quick check i just took it and got 100% :) 
LA
1.)1 2.)3 3.)2 4.)1 
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? 
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 ... 
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) 
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. 
CERT IV in allied health
Yes, what change could one suggest? 
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? 
SAT
Get you English up to the mark first before you attempt any tests. 
English
chicken's 
Data Management
Expectation is that you'll be left with 0.8 cents, use a proability distribution chart to help you. 
World History
What is the connection between Czar Nicholas II, mobilization, and WWI? 
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! 
EARTH SCIENCE
The answer is 1425 mL....because science is only measured using the metric system... 
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 ... 
statistics
4. Are women getting taller? In one state, the average height of a woman aged 20 years or older is 63.7 inches in 1990. A random sample of 100 women is taken to test if women’s mean height today is different from 1990. The mean height of the 100 surveyed women is 63.9 ... 
science
Thanks, I also got them all right, your to kind and have a blessed day. 
algebra
How would you solve this one 40x^556x^4+24x^3 divided by 8x^2 
Bio
What denotes the main relationship between protists and prokaryotes? do they both undergo transcription and translation? do they have different genetic codes? 
Math
Suppose a baseball player had 211 hits in a season. In the given probability distribution, the random variable X represents the number of hits the player obtained in the game. x P(x) 0 0.1879 1 0.4106 2 0.2157 3 0.1174 4 0.0624 5 0.0060 a.) Compute and interpret the mean of ... 
Math help, anyone?
11. would seem to me to be 9. It is fairly simply one to trick you. 12. x/4=6/7 multiply 6/7*4/x= 24/4 then simplify to get your answer. 15. 4 of 12 is 4/12 simplify 
Math
0.90893 
Science
Evolution and Biological Classifications 1.) what does a cladogram show? Answer: B = EVolutionary relationships between organisms 2.) Which pair below has the most shared derived characteristics? Answer: C = Cow, Horse 3.)Study the image below. Which pair of organisms is most ... 
Algebra
so its B? 
algebra
Remove the parentheses from the following expression, and combine like terms: (2x + 3y – 4z) – (x – y – z) A. 3x + 4y + 5z B. 3x + 4y – 3z C. x + 4y – 3z D. x + 2y – 5z 
Algebra
–2x(–3x ^2y)(2y) = ? A. 12x^3y^2 B. –3xy^2 C. 3xy^2 D. –12x^3y^2 
really need help in math
–2x(–3x 2y)(2y) = ? A. 12x3y2 B. –3xy2 C. 3xy2 D. –12x3y2 sorry that was the problem. i need help with this one. thanks xo 
really need help in math
24x^2y^2 ? 
biochemistry
i am currently doing an iodine value lab an error occured in my results and i do not know how to write up the conclusion and the discussion 
Circular motion Problem  moon completing an orbit
Given that sidereal month, the amount of time it takes the moon to complete one orbit, is 27.332 days. How far is the moon from the earth? 
Circular motion Problem Motorcycle HELP!!!?
A motorcycle is traveling about a circle with radius of 15meters. If the coefficient of friction between the tires and the track is 0.76, how many laps can the motorcycle complete in one minute? (N o t e: Friction between the tires and the road enables a vehicle to turn) 
Circular motion Problem  Please! need HELP!!!fast
An asteroid in space is attracted to the planet XYZ such that it accelerates at 0.0085 m/s^2 towards it. Given that planet XYZ has a mass of 4.7*10^24 kg. How far out from the planet is the asteroid? 
Fly Ball Lab  Projectile Motion Please HELP FAST!
In this lab, you will perform graphical and mathematical analysis on a tennis ball that is struck by a bat. The data required for this lab is the horizontal displacement of the ball from the location where it was hit to the point where it first strikes the ground and the time ... 
Science
This lesson is : Evidence of Evolution 1.) Which of the following explains why the a bone in a bird's wing is homologous to a bone in a lizard's front leg? ANSWER: D = the two species have a common ancestor 2.) A portion of the amino acid sequence of an enzyme taken ... 
physicsGravitational Attraction(please help)
1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both Thank you 
physics
Radius of Curvature A bicyclist traveling at 8 m/s rides around an unbanked curve. The coefficient of friction (is this static or kinetic friction?) between the tires and the road is 0.36. What is the radius of the shortest turn that the bicyclist can safely make? Please, ... 
physics
Gravitational Attraction 1. The centers of two 11.80 kg spheres are separated by 0.09 m. What is their gravitational attraction? 2. What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? Please answer both, I'd be greatful. ... 
math
What is the vertex of y=[2x]? 
Physics
When a person is given intravenous fluid, the bag containing the fluid is typically held about 1.2 m above the person's body. If the pressure in this fluid is just barely able to push the fluid into the person, what is the pressure in the person's blood? (The density ... 
science help plzzz
Megan's answers are totally incorrect. Everyone else is 100% correct. 
English
Which sentence is correct: They are planning a persons' party. or They are planning a people's party. I don't think either sounds correct, but these are the only choices! 
Statistics
12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ... 
Statistics
12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known allergies to poison ... 
Statistics
6)You are given the information that P(A) =0.30 and P(B) =0.40 (a) Do you have enough information to compute P(A or B)? Explain.(events A and B are mutually b) If you know that events A and B are mutually exclusive , do you have enough information to compute P(A or B)? Explain... 
Statistics
a. Critical Thinking Critical Thinking Suppose you and a friend each take different random samples of data pairs (x,y) from the sample population. Assume the samples are the same size. Based on your samples, you compute r= 0.83. Based on her sample, your friend computes r = 0.... 
Statistics
A sociologist is interested in the relations between x=number of job changes and y=annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information: X(Number of job changes)4 ... 
Can someone check these answer for me?
EVERYBODY ANSWERS ARE TOTALLY WRONG! OR SHOULD I SAY EXTREMELY WRONG! Just heads up dont trust anyone answers at all. I just took the quick check and I can honestly say everybody answers are completely wrong. Again don't trust anyone else's answers. 
Biology
You wish to produce a human enzyme, protein A, by introducing its gene into bacteria. The genetically engineered bacteria make large amounts of protein A, but it is in the form of an insoluble aggregate with no enzymatic activity. Which of the following procedures might help ... 
Business
no, D is wrong 
chemistry
Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) ¨ 2H2O(l) Which of the following is not conserved in this reaction? 
intermediate algebra
A local electronics store will sell seven AC adapters and two rechargeable flashlights for $86, or three AC adapters and four rechargeable flashlights for $84. What is the price of a single AC adapter and a single rechargeable flashlight? 
English
what is nonfiction? it means that it is real so it is a "which a is an accurate statement." 
science
An object with a mass of 70g and a volume of 100ml is most likely what substance 
Biochem
Thank you!