Recent Homework Questions About Arithmetic
Classical Mechanics Physics - Urgent help please
m = 0.1 Kg L = .15 m moment of inertia of ruler about center = (1/12) m L^2 = 1.88*10^-4 Kg m^2 ------------------------------ Method 1 decrease in potential energy = increase in kinetic energy Height of cg = .075 cos T height of cg at start = .075 meters height of cg at 30 ...
Saturday, December 7, 2013 at 5:46pm
let the medians intersect at F, so we have 90° angles at F Remember that the medians intersect at the centroid and the centroid divides each median in the ratio of 2 : 1, the longer side towards the vertex So let FE = x, then AF = 2x let FD = y, then FB = 2y In triangle ...
Saturday, December 7, 2013 at 8:41am
the shape you will get is half a torus. A torus is a donut or bagel shaped solid. We have cut ours in half (to make a tasty cream-cheese bagel) the y-intercepts: 0 = y(9-y) so y = 0 or y = 9 , You had that so we need the radius of the outer and the inner rings: y^2 - 9y = -x y...
Wednesday, December 4, 2013 at 9:18pm
Start by drawing a reasonably accurate rhombus on a piece of paper. Remember a rhombus has 4 equal sides and opposite angles equal, ( A square is a special kind of rhombus, so don't use a square) cut your rhombus out with scissors. Surprisingly, you will be able to form a ...
Tuesday, December 3, 2013 at 9:18pm
Go with Kuai - Algebra 1 (Reiny or Kuai)
sorry about my arithmetic error when I copied your diagram to paper, I had point Q as (3,6) instead of (2,6)
Monday, December 2, 2013 at 8:11pm
2nd question - calculus area between three curves
nice symmetry, should be easy to see that the x-intercepts are (c,0) and (-c,0) for both so just double the area from 0 to c area = 2∫(c^2 - x^2 - (x^2 - c^2)) dx from 0 to c = 2∫(2c^2 - 2x^2) dx from 0 to c = 2[2c^2 x - (2/3)x^3] from 0 to c = 2(c^3 - (2/3)c^3] = ...
Monday, December 2, 2013 at 2:12pm
I suggest you Google something like "Chinese Remainder Theorem" and I assume you know about modular arithmetic since I will be using properties of modular arithmetic so we have z = 1 mod 6 z = 1 mod 7 z = 7 mod 8 z = 7 mod 11 But, in the Chinese Remainder Therorem we...
Sunday, December 1, 2013 at 6:50am
2 pi f = 10^6/42 = 2.38*10^4 f = .379 * 10^4 = 3790 Hz
Saturday, November 30, 2013 at 6:41pm
Find x such that -8 x - 3, 3 x - 1, and 2 x + 49 are consecutive terms of an arithmetic sequence. x=?
Friday, November 29, 2013 at 10:47pm
so this an arithmetic sequence with a = 8000 d = 600 n = 27 term (27) = a + 26d = 8000 + 26(600) = $23,600
Friday, November 29, 2013 at 10:34pm
If cot(2Ø) = 5/12 , then tan(2Ø) = 12/5 and 2Ø is in either I or III tan 2Ø = 2tanØ/(1 - tan^2 Ø) let tanØ = u then 12/5 = 2u/(1 - u^2) , (for easier typing) 10u = 12 - 12u^2 12u^2 + 10u - 12 = 0 6u^2 + 5u - 6 = 0 (2u + 3)(3u - ...
Wednesday, November 27, 2013 at 11:42pm
depends on what arithmetic operation you perform the "equation" of two negative fractions is not an operation. Please clarify your problem.
Monday, November 25, 2013 at 6:56pm
Math Word Problem
1. common sense solution: if it takes 10 carpenters to do a house in 8 days, then 1 carpenter would take 80 days, and 4 carpenters would take 20 days. 2. by the "constant" method number of days = k/number of carpenters given: 8 = k/10 k = 80 so number of days = 80/...
Monday, November 25, 2013 at 12:21am
Calculus Area between curves
Here is a sketch of the region http://www.wolframalpha.com/input/?i=solve+x%2B6y%3D8+%2C+x%2B8%3Dy%5E2 I will do it the easiest way. The intersection points are (-4,2) and (56,-8) I would take horizontal slices effective width of a horizontal slice = 8-6y - (y^2 - 8 = ...
Sunday, November 24, 2013 at 10:20pm
Calculus - Volume by Integration
A quick look at the region bounded by y=(x-2)^3-2, x=0, y=25 http://www.wolframalpha.com/input/?i=plot+y%3D%28x-2%29%5E3-2%2C+x%3D0%2C+y%3D25 shows me that I should scan horizontally from y = -10 to y = 25 using V = π∫ x^2 dy from y = -10 to 25 I need ...
Sunday, November 24, 2013 at 11:41am
Let the point be P(x,y) , point (-4,1) be A Since the shortest distance must be where AP is perpendicular to the given line. slope of given line = 6/5 so slope of AP is - 5/6 equation of AP: y-1 = (-5/6)(x+4) times 6 6y - 6 = -5x- 20 5x + 6y = -14 , #2 6x - 5y = -1 , #1, the ...
Saturday, November 23, 2013 at 3:22pm
notice that one parabola opens up, the other down. their intersection ..... x^2 - c^2 = c^2 - x^2 2x^2 = 2c^2 x^2 = c^2 x = ± c ---- y = 0 in both they intersect at (-c,0) and (c,0) using symmetry area = 2∫(2c^2 - 2x^2) dx from 0 to c = 2(2c^2 x - (2/3)x^3) | from...
Thursday, November 21, 2013 at 10:32pm
Calculus-Area between curves
first of all reduce the equation to simplest form: y = 2√x y = 5 y + 2x = 4 Your sketch should look like a "triangle" with one side slightly curved see: http://www.wolframalpha.com/input/?i=plot+y%3D2*sqrt%28x%29+%2C+y%3D5+%2C+y%2B2x%3D4 we need ...
Thursday, November 21, 2013 at 10:16pm