Posts by Aurora
Total # Posts: 31
Check my work? What is the approximate pH of a 0.05 M solution of HSCN that has a Ka of 10-4? HSCN -> H+ + SCN- --------------------------- The equation for calculating pH is pH = -log [H+] Now we need to find H+ and solve. [HSCN] = 0.05 M the molarity Ka = [H+][SCN-]/[HSCN...
May 13, 2016
A ball bearing at 22.0 Celsius is dropped into a cup containing 250.0 g of water at 20.0 Celsius. The water and ball bearing come to a temperature of 30.0 Celsius. What is the heat capacity of the ball bearing in J/Celsius? How do I do this kind of question? I don't expect...
October 31, 2015
Galileos law of falling bodies states that the rate of fall caused by gravity is the same for all objects, regardless of weight. This means that all objects have a free-falling acceleration of 9.8m/s2. However, a significant contradiction of this theory is the fact that ...
June 25, 2015
statiatics- central tendency
The Frequency distribution of a histogram is the following scores: X F 1 1 2 1 3 2 4 1 1) what is the total area in the histogram? 2) what is half the area in the histogram? 3) Assume that the scores are measurements of a discrete variable. Find the median. 4) Assume the the ...
September 15, 2014
The following are weights (in lbs) for a sample of 11 baby boys at the age of 18 months: 21.8 22.2 23.4 24.6 25.1 26.7 27.3 28.0 29.8 30.9 31.2 What is the 80th percentile estimate for these sample?
September 12, 2014
A car travels 20.2 km due north and then 31.3 km in a direction φ = 61.2◦ west of north. Find the magnitude of the cars resultant displacement. Then Calculate the direction of the cars resultant displacement, measured counterclockwise from the northerly ...
January 28, 2013
math withpizzazzi book c pg.C-14and 13
what re the answe to these two mat riddles : whats wrong with getting a hair cut ? and what do you call it when a bunch of kids throw crayon and poster paint at ou
September 20, 2011
I am figuring out how much KCL will dissolve in 50 grams of water at sixty degrees, based on a graph. According to the graph, 45 grams of KCL can dissolve at 60 degrees. So I subtracted 45 from 50, and got five. The thing is my book said the answer should be between somewhere ...
March 12, 2009
1. Find values of a,b,c, and d such that g(x) = a(x^3)+b(x^2)+cx+d has a local maximum at (2,4) and a local minimum at (0,0) 2. Need someone to explain this. Graph a function f(x) for which: f(3)=f(5)=0 f'(x)<0 if x<4 f'(4)=0 f'(x)>0 if x>4 f"(x)&...
June 20, 2007
I am unsure of how to take the derivative of this equation. It may be the exponents that are giving me trouble but I'm not sure exactly. Find the equation of the tangent line to the curve 4e^xy = 2x + y at point (0,4). On the left side, is the "xy" the exponent ...
June 11, 2007
Find the equation of the tangent to the graph of f(x)=2x^4 (to the power of 4) that has slope 1. Derivative is 8 x^3. This equals 1 at x = 1/2. At this point the y-coordinate is f(1/2) = 1/8. The equation of the tangent line is thus: 1/8 + 1*(x-1/2) = x - 3/8 Thank you for ...
March 8, 2007
Stuck with 2 questions. Need of assistance before tomorrow. Question 1. A summer camp has seven 4.6m canoes, ten 5.0m canoes, four 5.2m canoes, and four 6.1m canoes. Canoes are assigned randomly for campers going on a canoe trip. a) Show the probability distribution for the ...
December 21, 2006