Total # Posts: 58
A boater wants to head straight across a river that has a current of 3 km/hr. If the top speed of the boat in still water is 4 km/hr. 1.find the direction the boat must travel into the current to go straight across the river? 2. How fast is the boat going straight across the ...
October 9, 2016
please help!!!!Apply newtons method to approximate the x-values of the indicated points of intersection of the 2 graphs. continue the process until 2 successive approximations differ by less than 0.001. (Hint: Let h(x)=f(x)-g(x)) f(x)=x^6 g(x)=cos(x) x= ??? (smaller value) x...
April 4, 2013
To save for a child's education,the petersen's deposited $2500 into an account that pays 6% annual interest compounded daily. Find the amount of interest earned on this account over a 20-year period.
October 24, 2011
Good day to you. How can I approach this math problem. "To save for a child's education, the Petersens deposited $2500 into an account that pays 6% annual interest compounded daily. Find the amount of interest earned on this account over a 20-year period". I try ...
October 23, 2011
A piece of modeling clay is motionless in space. Another piece of clay that is 4 times as massive moving at 10m/s collides with it and sticks to it. What is the momentum of the combined blob after the collision?
October 18, 2011
SPANISH PLEAASSEE HELPP (im stuck)!!!!!!!!!!!!!!!!
the last answer is ellos, not este.
September 15, 2011
Hi, I appreciate your expert help,and I have a question for you. If I'm asked to decribe resting potential, action poential, and synaptic transmission,in point form;would the following responses be right? Resting Potential: 1.Membrane at resting potential- negative on the ...
April 6, 2011
Hi, I'm trying to solve some chemistry problems, like the ones my teacher says will appear on our exams. The problem reads like this: What is the hydrogen conentration in a bleach sample that register 9.55 using a pH meter? My Attempt: Since this sample register a 9.55 on ...
December 13, 2010
Hi ! Could you please help me to see through this problem. *I know it's asking me to find the hydrogen ion concentration in a bleach sample. *If the pH meter reads 9.55..this suggest to me this is a base. Maybe,I can use the equation: pOH = -log (OH^-) = -log (9.55) = 0....
December 12, 2010
Hi, I've watched a tutor solve a simple dilution solutions problem on video. There's a calculation in that problem I wish you could clarify for me. It goes like this: Approximately what volume of water is needed to dilute 25.0 mL of 18.0 M sulfuric acid to 3.0 M ? M * ...
December 11, 2010
Hi,may I have your help? I have posted a titration question that I'm trying to solve. The correct answer to the problem is 0.128 M, however,I have arrived at the answer: 0.000128 M. Here's the question: If 38.30 mL of 0.250 M NaOH is used to titrate 25.0 mL of ...
December 10, 2010
Hi,can I have your help? I'm just trying to solve a few Dilution Solution problems. I'm stuck on these two,and I wish you could help. Here's one: A 500 mL bottle of concentrated acetic acid is diluted to make a 5.0% solution. Find the volume of diluted that is ...
December 8, 2010
You have been really helpful..may I have your suggestion.. as to the approach to solving these 3 chemistry questions please.I'm new to the topic area:PARTIAL PRESSURES 1.A gas mixture consists of 6.91g of N2 gas,4.71g of O2 gas and 2.95g of He.What volume does the mixture ...
November 24, 2010
Please let me know how I'm doing with the following chemistry problems. I appreciate your imput. Here's problem 1: A sample of Helium gas occupies a volume of 29.4mL AT 18deg.celcius. (a)Would the volume of this gas sample be doubled at 36deg.celcius? (b)At what ...
November 24, 2010
Tutors: thanks for your help. Is this how this problem is solved ? A sample of Xenon gas at 20degrees celcius and 0.570atm is cooled to a pressure of 0.100atm. If the volume remains constant what is the final temperature in degree celcius? Solution: Using Gay-Lussac's Law ...
November 23, 2010
Please let me know how I am doing with the following three chemistry questions. 1.A sample of a gas in thermometer has a volume of 135mL at 11 degree celcius.Indicat what temperature(in k and degree celcius)would correspond to the foll.volume: (a)volume:113mL temperature ?? ...
November 23, 2010
Please let me know how you would approach the gas law problem. Here goes: If the pressure exerted on the gas in a weather ballon decreases from 1.01 atm to 0.562 atm as it rises. By what factor will the volume of the gas in the ballon increase as it rises? I can't seem to ...
November 21, 2010
"I this problem has serious problems of it own" lol That comment was great..made me laugh. The question was taken from my chemistry text's supplementary online students resource. I did email that question to my teacher afterwardds..she taught it was a strange ...
November 16, 2010
I just have a quick question for you. Do I use Charles' Law to solve the following problem, if not, how should I approach this? If a 5.0 sample of a gas undergoes an increase in temperature under constant pressure,what is a possible new volume? Thanks for your help.
November 16, 2010
Thank you for being helpful in the past. Could you check my interpretation of the three chemical word problems below,and,let me know if I'm on the right track? 1.Determine the mass of water vapor formed when 1.00g of Butane (C4H10)is burned in a lighter(combined with ...
November 3, 2010
Thank you for being helpful in the check my interpretation of the three word problems below,and,let me know if I'm on the right track? Determine the mass of water vapor formed when 1.00g of Butane (C4H10)
November 3, 2010
Please help me solve this problem. I don't know how to approach this problem type. C3H8(g) + 5 O2 (g) ---- 3 CO2(g) + 4H2O(g) Conside the reaction. If you start with 7.0 moles of C3H8 (propane)and 7.0 moles O2, ________ mole(s) of carbon dioxide will be produced. Thanks ...
November 2, 2010
Please let me know if my equation is correct,taken from the following word problem. If you react Iron(111)oxide with carbon monoxide,you will produce liquid iron and carbon dioxide. Fe2O3 + CO --> Fe + CO2. If I'm correct..how do I balance this. Thanks for your help.
October 30, 2010
Based on the law of definite composition, Dalton proposed that one atom of carbon combines with two atoms of oxygen to always produce CO2. Similarly,he proposed that two atoms of hydrogen combine with one atom of oxygen to give a molecule of H2O. Finally,Dalton reasons that ...
September 17, 2010
Saying that 4<(sq.root of x)<9 is equivalent to saying what about x ? a. 0<x<5 b. 0<x<65 c. 2<x<3 d. 4<x<9 e. 16<x<81 Please help. Does this problem relate to 'x'values on the xy coordinate system ? If so please explain the concept ...
July 26, 2010
On a math test,12 students earned an A. This number is exactly 25% of the total number of students in the class. How many students are in the class? 'In this problem I'm not sure whether I'm being asked to solve for one or two unknowns. May I have your help ? ...
July 21, 2010
the scores on a 100 pt test are normally distributed with a mean of 80 and a standard deviation of 6. a student's score places him between the 69th and 70th percentile. what is his score?
June 10, 2010
What is the line of thought or sequence of thought for solving simple algebraic expressions? When I'm asked to solve the expression (5k)k^3....first I check with my list of exponent rules, and there are always a few that could be used to solve the expression.I just don'...
May 12, 2010
the arid and difficult conditions of the landscape rather than new land laws passed to assist settlers were more important to shaping the emerging institutions of the american west in the later decades of the 19th century true or false?
April 17, 2010
This is a problem class known as permutations. There are 4 choices for your first number (i.e, 1,2,3,4)followed by 3 ways to pick the next number since there are only 3 numbers left. This leaves 2 ways to pick the next number and 1 way to pick the remaining number. 4*3*2*1 = 24
October 6, 2009