Science & Mathematics - 29 November 2007

2007-11-29 06:46:28 · 11 answers · asked by clavdivs 4 in Mathematics

Okay, so I'm in Chemistry I in college. I didn't have a good high school experience with chem, so it's biting me in the bum now.

I'm having the hardest time setting up the problems. I get how to do some of the calculations, but when I get a problem on a test, I can't pick out what information to plug in where. Here's one of the MANY questions I'm having a problem with:

"You have a 5.00 L solution of silver (I) nitrate. Suppose you want to convert the silver ions to silver metal. To do so, you will add zinc metal to reduce the silver ions. You first take a 3.00 mL sample of the silver (I) nitrate solution and find that it takes 20.0 mg of zinc metal to convert all of the silver ions in the sample to silver metal. What is the concentration of silver (I) nitrate? How much zinc (in grams) will be necessary to convert all of the silver ions in the 5.00 L solution to silver metal?"

I get that I need to find the molarity, but my book doesn't have problems similar to this.

2007-11-29 06:46:00 · 1 answers · asked by qpxandrad 4 in Chemistry

1.

22y^4-33y^3+11y^2




2.

77r^7s^7-84r^8s^4

2007-11-29 06:38:56 · 7 answers · asked by wish on a star 1 in Mathematics

I have an exercise with a question that says:

Use the method of Laplace transforms to determine the solution of the first order ordinary differential equation:

4dx/dt + x = 1 + 4cos(2t); x(0)=1

2007-11-29 06:36:34 · 4 answers · asked by Kable 1 in Mathematics

My dog's water bowl hold a 1 liter "tank" (just a small bottled water bottle you buy in any store) of water and lasts all week. It supplies water as needed without effort on my part and uses gravity instead of batteries. Based on this principle, there must be someone out there who is smart enough to think of an easy cheap way to make this happen. Anyone?

2007-11-29 06:36:28 · 4 answers · asked by Tim & 2 in Other - Science

2007-11-29 06:34:31 · 7 answers · asked by Tanya L 2 in Mathematics

a/(sinA) = b/(sinB)
where lower-case letters refer to the sides and upper-case letters refer to the angles opposite those sides
The side b in error by 1.1%.
Aand B are given as 25 degrees and 58 degrees respectively, to the nearest degree.
Using partial differentiation find the greatest percentage error in the calculated value of a.

2007-11-29 06:29:36 · 3 answers · asked by ozi 1 in Mathematics

Dumping the air means losing that amount inside the air lock, but pumping uses an increasing amount of energy as vacuum is obtained.

2007-11-29 06:24:58 · 8 answers · asked by Anonymous in Astronomy & Space

i have to write them as a ratio as an equivelant fraction with a denominator of 100

2007-11-29 06:20:12 · 3 answers · asked by Anonymous in Mathematics

I need to calculate the degrees on the celestial sphere between the Moon and the Sun, but all I have are these values:

Moon:
RA/DE 14h16m / -19*19'
Az/Alt +243*25' / +0*57'

Sun:
RA/DE 13h11m / -7*32'
Az/Alt +262*43' / -3*4'

I know this is probably a bizarre question. I know you can estimate the degrees in the sky using a "finger and fist" method, but the trick is I'm trying to calculate it for a date in the past. I'm not sure if all of these values are relevant, it is just what I have. Is there any way to do it?

2007-11-29 06:17:33 · 1 answers · asked by kenafpureblade 1 in Astronomy & Space

Why does the polar equation r = (2)sin(theta) become x^2 + (y -1)^2 = 1

2007-11-29 06:16:51 · 5 answers · asked by jeff h 1 in Mathematics

2007-11-29 06:09:04 · 4 answers · asked by Anonymous in Astronomy & Space

switches should you open?

A. Switch S5
B. Switch S2
C. Switch S3
D. Switch S4

2007-11-29 06:08:20 · 5 answers · asked by Anonymous in Engineering

GIVE ME A GOOD ANSWER AND SUPORTED

2007-11-29 06:06:32 · 18 answers · asked by jose a 1 in Astronomy & Space

1.Given the function f(x) = x2 - 6x + 8, find the y-coordinate of the vertex and list the ordered pair.
A.80 (-6, 80)
B.35 (-3, 35)
C.8 (6, 8)
D.-1 (3, -1)

2. Given the function f(x) = x2 - 6x + 8, find the x-coordinate of the vertex.
A.-6
B.-2
C.3
D.6

3.Given the function f(x) = x2 - 6x + 8, find f(-2). f(-2) =
A.-6
B.6
C.10
D.24

4.Solve the following quadratic equation.0 = x2 + 5x - 9
A.x = 2.5 and y = -15.25
B.x = 2.5 and y = 2.75
C.x = -1.405 and x = 6.405
D.x = 1.405 and x = -6.405

please help...will give 10 points to whom ever gets these right...please and thank you!

2007-11-29 06:02:52 · 3 answers · asked by MEB 2 in Mathematics

A ship travels 55km on a bearing of 11 degrees, and then travels on a bearing of 101 degrees for 133km. Find the distance of the end of the trip from the starting point to the nearest kilometer.
54km
144km
10km
188km

2007-11-29 06:02:10 · 5 answers · asked by Anonymous in Mathematics

A 17.8 kg person climbs up a uniform 85.1 N ladder. The upper and lower ends of the ladder rest on frictionless surfaces. The bottom of the ladder is fastened to the wall by a horizontal rope that can support a maximum tension of 87.5 N. The angle between the horizontal and the ladder is 56 degrees. The acc. of gravity of 9.8 m/s^2
http://i217.photobucket.com/albums/cc115/twitchdatweek/Hw14squestion3image.jpg
a. Find the tension in the rope when the person is one-third of the way up the ladder; i.e., (10.2m/3 = 3.4 m). Answer in units of N.
b. Find the maximum distance Dmax the person can climb up the ladder before the rope breaks. Answer in units of m.

2007-11-29 05:56:52 · 2 answers · asked by Anonymous in Physics

a. a circle that marks the circumference of the globe
b. a parallel that goes all the way around the globe
c. a single meridian that extends from the North to the South Pole

2007-11-29 05:55:04 · 7 answers · asked by Anonymous in Geography

From a balloon 996 feet high, the angle of depression to the ranger headquearters is 46 49' degrees. How far is the headquarters from a point on the ground directly below the balloon (to the nearest foot)?
930ft
925ft
935ft
940ft

2007-11-29 05:54:10 · 4 answers · asked by Jimmy1992 1 in Mathematics

3tan^3x=tanx
my solution:
tanx(3tan^2x-1)=0
tanx=0 > x = 0,pie (how do i get this PIE FROM)
or 3tan^2x -1=0
tanx=+-radical3/3
x = pie/6,5pie/6,7pie/6,11pie/6(HOW DO I GET ALL THESE PIES FROM?)
(I just don't undrestand how to get these pie/6,5pie/6,7pie/6,11pie/6 from?)

2007-11-29 05:46:28 · 6 answers · asked by frenchies 2 in Mathematics

it can be stuff over the last 20 years

2007-11-29 05:46:06 · 5 answers · asked by kevin f 3 in Other - Science

1. Endpoints of a diameter are (5, 3) and (8, -3)

2. Endpoints of a diameter are (6, 9) and (4, 9)

2007-11-29 05:42:37 · 3 answers · asked by wrongnumber 1 in Mathematics

So was the Apollo 11 flight a hoax?
If you know the answer, then tell us, WITH EVIDENCE. Not just i think blaa..
Thanks.

2007-11-29 05:40:50 · 11 answers · asked by Cloetta 2 in Astronomy & Space

2007-11-29 05:37:43 · 8 answers · asked by ? 1 in Astronomy & Space

2007-11-29 05:37:42 · 2 answers · asked by artrimiks 1 in Earth Sciences & Geology

sin (a+2) - sin(a) = 2 cos(a+1)sin(1)

2007-11-29 05:33:28 · 3 answers · asked by Princess 2 in Mathematics

Find all solutions on 0≤θ<360 of: √3 tanθ - 2sinθtanθ = 0

2007-11-29 05:32:15 · 3 answers · asked by Princess 2 in Mathematics

I am not talking about fluoroscent one which produces light equavalent to 50 W incandescent bulb..
Suppose we have a 50 w CFL and 50W Incandescent bulb,would they contribute equally to the electricity bill?

2007-11-29 05:27:02 · 5 answers · asked by Ali 5 in Physics

(sinx - cosx)^2 = 1-sin2x

2007-11-29 05:24:46 · 2 answers · asked by Princess 2 in Mathematics

2007-11-29 05:21:37 · 5 answers · asked by Yohanna S 1 in Zoology