Total # Posts: 390
"Suppose some sort of clamp is applied to hold an electron fixed at the distance of 2.5 Angstroms from a lithium nucleus Li3+ which is also clamped into position. Calculate the magnitude of the force between the two fixed particles." The books says the answer is: -2....
October 16, 2011
a) Vi= 6.7sin(53) Vi = 5.35 V = Vi - gt at top 0 = Vi - g t so t at top = Vi/g t = .55 y at top = 1 + Vi t - 4.9 t^2 = 1 + 5.35(0.55) - 4.9(.55)^2 y at top = 2.46 b) u = 6.7 cos 53 x = u t x = (6.7 cos 53)(.55) x = 2.22
October 5, 2011
A ball swings in a vertical circle at the end of a rope 1.50 m long. When the ball is 35.9° past the lowest point on its way up, its total acceleration is (-22.5 i + 20.2 j)m/s^2. Find radial acceleration?
September 17, 2011
your aunt gives you a check on your birthday each year. on your first birthday , she gives you a check for one cent. the next year she gives you 3 cents , then 9. each year she triples the amount of the previous year 's check. how old will you be when she gives you a check...
September 11, 2011
and List all measurements and include proper labels. Molecular weight of benzoic acid: 122.12 g/mole Mass of benzoic acid used: Titration of NaOH and benzoic acid: (Fine Titrations Only) Trial 1 Trial 2 Initial volume(NaOH)(ml) final volume(NaOH)(ml) Calculations/...
April 15, 2011
PLEASE NOTE: Titration requires several steps in order to obtain exact results. The procedures described in this lab assume that you have already done the TITRATION TUTORIAL and are familiar with the technique. 1. Prepare the NaOH solution by dissolving approximately 4g of ...
April 15, 2011
The Problem: The spherical top holds a little over 54,000 gallons of water. The base of the top is 60 feet above the ground. The diameter of the supporting column is one-third the radius of the sphere. The base of the supporting column flares out like a cone (a frustum) so ...
March 27, 2011
A certain roller coaster has a circular, vertical loop of radius 10 meters, such that at its top the riders are upside down. How fast does the roller coaster move at this point if the riders feel perfectly weightless when passing the top of the loop?
March 20, 2011
find the lengths of the sides of a triangle whose perimeter is 37. The measure of the first side of the triangle is 8 less than the second side, and the second side is twice the length of the third side
February 10, 2011
A Rectangular Field is to be enclosed by a fence and divided into three parts by another fencer. Find the maximum area that can be enclosed and separated in this way with 500 meters of fencing.
February 3, 2011
A ball throw at 45 degree angle with an initial speed of 15m/s. the time for the ball to reach its highest point can be found from the data and known constants using which equation? solve for time?
January 31, 2011
your carbon atoms aren't equal and i didn't split up my carbon dioxides however it should change anything balancing wise. 2C3H6N6O6 + 3O2==> 6h20 +6CO2(or 3CO2 +3CO2) + 6N2 C=6 C=6 H=12 H=12 N=12 N=12 O=18 O=18 Hope this helps!
January 17, 2011
In my book the anser for D is 2.68 x 10^4 mg/L as CaCO3, my first thought was to do what you did but i cant get to the answer in the book, am I missing something very obvious here? Im getting like 5.4 x 10^4
January 15, 2011
A museum curator moves artifacts into place on many different display surfaces. Use the values in Table 4-2 in the textbook to find Fs,max and Fk if you were to move a 157 kg aluminum sculpture across a horizontal steel platform. Fs,max: Fk:
November 18, 2010
I have one problem I just can't figure out, A machine in an ice factory is capable of exerting 3.30 * 10^2 N of force to pull large blocks of ice up a slope. The blocks each weight 1.21 * 10^4th N. Assuming there is no friction, what is the max angle that the slope can ...
October 13, 2010
A. a = v/t 165km / 8s = 20.625 km/h/s B. t= 60s-8s =52s, V= 1650km/h-165km/h =1485km/h a=v/t 1485km/h / 8s= 185.625km/h/s C. d=1/2at^2 1/2 * 20.625 km/h/s * (8s)^2 = 183.333m D. 60s-8s=52s d=1/2at^2 1/2 * 186.625km/h/s * (52s)^2 = 70.088km
October 13, 2010
You need to set up the proportion Base 6.5m 4m ---- ---- ---- Length 3.7m e Then you cross multiply: 6.5xe=6.5e 4x3.7= 14.1m So therefore, 6.5e = 14.1m Then divide both by 6.5 to get what e equals. 6.5e/6.5 = e 14.1/6.5 ≈ 2 so e ≈ 2.
October 6, 2010
A roulette wheel has 18 red slots and 18 black slots numbered alternaetly with the numbers 1 through 36. Two green slots are numbered 0 and 00. The winning number is determined by the slot into which a single marble rolls. Players are not allowed to bet on green. The house ...
September 18, 2010
When a survey of 800 people was done, 55% of those surveyed said they ate candy, 65% said they ate chips and 90% said they ate hot dogs. What is the smallest possible number of people who said they ate candy, chips and soda? -Zach
May 26, 2010
Six pipes each having a radius of 0.5 feet are stacked in a triangular pile with three pipes on the ground tangent to each other, two in the next row and one on top. What is the height of the pile. Express you answer in simplest radical form
May 13, 2010
A large tank contains 400-kg mixture of water and alcohol. The mixture is 64% alcohol by weight. At each step, 100 kg of the mixture will be drained from the tank, replaced with 100 kg of water and then stirred. After three steps, what percent of the final solution will be ...
May 4, 2010
Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 5 2m - 1 ______ + ___ = ______ 4 6 12
April 28, 2010
Please help me! Sorry there are 4 questions I need to check my attempts with to see if I am on track. Thanks!! 1. 5-3[2(3x-4)+3] 2. Evaluate when x = -3 and y = 2 3x squared - 4y squared _______________________ 4x - 7y 3. -3/4y = -24 4. m + 1 + 5 = 2m - 1 ______ _ _______ 4 6...
April 28, 2010
9th grade - Civics
I'm doing a crossword. The question is what is the term to "postpone a sentence/fine?" It starts with an R_ _ _ I _ _ _. Thought it was suspend but this isn't right. Any help is great
April 28, 2010
With income earned by selling the rights to his life story, an actor invests some of the money at 3% and 30,000 more than twice as much at 4%. The total annual interest earned from the investments is $5600. How much is invested at each rate?
April 21, 2010
How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit? Please help :) thanks -Zach
April 21, 2010
The value of a "Mint State-63" 1950 Jefferson nickel minted at Denver is 8/7 the value of a 1945 nickel at Philadelphia. Together, the total value of the two coins is $15. What is the value of each coin?
April 14, 2010
1) The concentration of the aluminum ion in a test solution is 0.10M. Using the Ksp for aluminum hydroxide (3. x 10^-34), calculate the concentration of hydroxide needed to precipitate aluminum hydroxide. From the concentration of the hydroxide, calculate the pH of the ...
April 1, 2010
If the yield from the reaction of acetic acid with isopentyl alcohol is 45% how many grams of isopentyl acetate are formed from 3.58g of acetic acid and 4.75g of isopentyl alcohol?
March 18, 2010
The radius of a circle is increased by 85%. How much will the area increase in percent? Round your answer to the nearest tenth if a percent. I'm stuck on this question. Thanks -Zach
December 27, 2009
need help thank-you translate the verbal phrase into an inequality, then solve the inequality and graph your solution, the product of 6 and the difference of 6x and 3 is less than or equal to the product of -2 and the sum of 4 and 8x
December 7, 2009