Science & Mathematics - 12 November 2007

2007-11-12 13:32:38 · 9 answers · asked by lfmc 1 in Mathematics

need this two equation to solve "Log base 3 (2x+7) = 5" and


Log base 7(2x+7)= Log base 7 (2x+2)

2007-11-12 13:32:36 · 7 answers · asked by rambo 1 in Mathematics

project

2007-11-12 13:31:42 · 2 answers · asked by Anonymous in Geography

The following problem is a standard problem found in many physics text books. A block of mass M is at rest on a horizontal frictionless table. It is attached to a rigid support by a spring of constant k. A clay pellet having mass m and velocity v strikes the block from the opposite side that the spring is attached to.

(a) Determine the velocity of the block immediately after the collision.
(b) Determine the amplitude of the resulting simple harmonic motion. In order to solve this problem you must make a number of simplifying assumption; some are stated in the problem and some are not. First, solve the problem as stated.
(c) Discuss the approximations you had to make in order to solve the problem. (There are at least five.)

Explain your work. Thanks! :)

2007-11-12 13:31:20 · 1 answers · asked by Anonymous in Physics

2007-11-12 13:30:16 · 10 answers · asked by brownie 1 in Mathematics

The total flow rate through a 1 cm radius tube of length 1000 cm is 10 liters per minute. What is the average velocity of the fluid?

2007-11-12 13:27:57 · 1 answers · asked by ShanaReynolds 1 in Biology

What is the solubility of MX2
in 0.11 M M(NO3)2?

MX2 --> M + 2X (ksp=4.79e-13)

i...enough....11.........0
d..-x..............+x..........+2X
f...some........(.11+x)....2X

I am solving

Ksp=[M]*[X]^2
4.79e-13=(.11+X)(2x)^2
I keep getting the answer 1e-6

I don't know what I am doing wrong. Please explain if you can help. Any help is appreciated :)

2007-11-12 13:27:07 · 1 answers · asked by Anonymous in Chemistry

2007-11-12 13:26:00 · 1 answers · asked by guessx3 2 in Chemistry

Can you make stainless steel from Molybdenum

2007-11-12 13:19:16 · 4 answers · asked by Anonymous in Engineering

The human heart provides about 1 to 10 watts of power to circulate blood through the body. A 9.6 volt, 2.6 amp-hour rechargeable battery is used for some cordless electric drills. For 100 percent efficient conversion of electrical energy into blood pumping work, estimate how long one of these rechargeable batteries qould last when 5 watts of power is consumed. Recall that 1 J/sec = 1 W = 1 A * 1 V

2007-11-12 13:18:32 · 2 answers · asked by ShanaReynolds 1 in Physics

A. 1/3
B. 1/5
C. 3/10
D. 7/20

2007-11-12 13:18:25 · 11 answers · asked by PETEY 1 in Mathematics

TRUE OR FALSE
1) If our body rejects a medication, it it due to MARKER proteins

2) As a cells volume increases the cell's surface are DECREASES

3) MITOCHONDRIA produce most of the cells proteins

4) GOLGI are responsible for assembling amino acids with proteins

5) The HYDROPHOBIC end of the phospholipid faces the cytoplasm
GOLGI are responsible for assembling amino acids with proteins

2007-11-12 13:17:37 · 5 answers · asked by mz. * 1 in Biology

Please help.

1. Find the energy required to ionize a ground state hydrogen atom. That is, what is the energy required to make the transition from n = 1 to n = inifinite.

I'm assuming use E = -R_h * Z^2 ( 1/n^2 final - 1/n^2 initial )
where n final is 0 (because infinite makes it equal to 0) and n initial is 1 and z = 1???

2. Calculate the frequency of light emitted when the electron in an He^+ ion relaxes from the third energy level to the first energy level.

I don't get this, Am i suppose to use the equation above but i need to change n final to 1 and n initial to 2 while changing z to 2 since 2 is He^+ atomic number and solve?

3. If an electron in a hydrogen atom relaxes to the second energy level, emitting a photon of wavelength 410.2 nm, what higher energy level did it start at?

I use e = hv, c = lambda * v (V = wavelength)

find the energy and plug into Rydberg's equation and solve right?

Thx =)

2007-11-12 13:17:34 · 1 answers · asked by Anonymous in Chemistry

-2 plates move side by side
-transform boundry does not have subduction zone along it
-found along most of California san andreas fault
WHICH IS TRUE, OR ALL THEY ALL TRUE?

2007-11-12 13:14:35 · 2 answers · asked by plocsgirl 2 in Earth Sciences & Geology

2007-11-12 13:12:26 · 8 answers · asked by j.ean_831 2 in Biology

2007-11-12 13:12:07 · 2 answers · asked by Max H 1 in Biology

2007-11-12 13:10:55 · 4 answers · asked by Anonymous in Biology

2007-11-12 13:10:40 · 2 answers · asked by Anonymous in Biology

Im confused! I want to use my gel cell small light weight 12 volt 7ah/20h battery for my 45 amp electric outbord if my calculations are correct then 7ah multiplyed by 20hour equals 140 amphere battery,and if my electric outboard draws constint 45 amps than my 7ah/20h battery should last 3.11 hours (45amps divide 20 hours) equals 3.11 hours (AM I CORRECT IF NOT WHY) THANKYOU FOR YOUR HELP...

2007-11-12 13:09:51 · 2 answers · asked by Anonymous in Physics

If I have a ramp that is 0.285m long at an angle of 17degrees, and a final velocity of 2.38m/s, how can i get the initial velocity????

2007-11-12 13:08:40 · 1 answers · asked by Emma G 1 in Physics

I need some help, I've searched my textbook and can't find the answers.

How do the processes "Light-dependent reactions" and Light-independent reactions" relate to each other? Where does each occur?

Thank you so much!

2007-11-12 13:08:20 · 2 answers · asked by MeGirl 2 in Biology

An electron movies with a speed of .600c. what is its momentum? the answers is 2.05x10^-22 Kg. m/s
I only know how to get gamma.

2007-11-12 13:07:36 · 3 answers · asked by mastersource2005 5 in Physics

2007-11-12 13:07:19 · 1 answers · asked by Anonymous in Biology

when all the info i have is amount Kinetic energy and the momemtum of the object

i know that KE=1/2m*v^2
but i don't have the mass. boo.

2007-11-12 13:02:51 · 1 answers · asked by *~JeS~* 5 in Physics

2007-11-12 13:02:15 · 3 answers · asked by plocsgirl 2 in Earth Sciences & Geology

2007-11-12 12:59:31 · 3 answers · asked by Laura B 1 in Biology

how many electrons are found in the outer shell of metalloids?

oh, and i have one more question.

What element is the most abundant element in the universe?

2007-11-12 12:58:46 · 2 answers · asked by Anonymous in Chemistry

I just cannot figure out what I am doing...How do you balance them. I do understand the canceling out of spectators, but when I write out the equation, I get confused on what is written first and which ones stay together and break apart. For example...
CaCl2 (aq) + K3PO4 ----> what goes here??? And once you figure it out and write it all out to see the spectators which ones stay together and which ones part???
PLEASE SOMEONE HELP....

2007-11-12 12:58:16 · 7 answers · asked by stacy a 2 in Chemistry

can anybody please tell me what is the J2 perturbation? what are the effects of J2 perturbation?

2007-11-12 12:57:06 · 2 answers · asked by Anonymous in Astronomy & Space

2007-11-12 12:56:27 · 11 answers · asked by Anonymous in Other - Alternative