Science & Mathematics - 7 September 2007

I have slightly confused with this Physics problem!.....i cannot figure out how to do it

Two vectors A and B have magnitude A=3.06 and B=3.09. Their vector product is A x B = -5.09 k + 1.91 i. What is the angle between vectors A and B?

2007-09-07 13:23:19 · 3 answers · asked by xxx 1 in Physics

The sum of the measures of the angles of a parallelogram is 360. In the parallelogram below, A and D have the same measure as well as angles C and B. If the measure of angle C is twice the measure of angle A, find the measure of each.

2007-09-07 13:23:16 · 3 answers · asked by Athena D 1 in Mathematics

Massive problems with natural log (ln) here for school...how do I go about this??

Thanks!!

2007-09-07 13:22:57 · 3 answers · asked by netsurfer733 2 in Mathematics

2007-09-07 13:18:30 · 11 answers · asked by Anonymous in Mathematics

2007-09-07 13:16:05 · 2 answers · asked by Tarana W 1 in Other - Science

Everything is caused by something other than itself.
Therefore the universe was caused by something other than itself.
The string of causes cannot be infinitely long.
If the string of causes cannot be infinitely long, there must be a first cause.
Therefore, there must be a first cause, namely God.
Everything that has a beginning in time has a cause.
The universe had a beginning in time.
Therefore, the universe has a cause.
The only thing that could have caused the universe is God (because the cause has to be spaceless and timeless).
Those who disagree with this argument do not believe there was a beginning of time. Doubters believe that the scientific account of the big bang did not occur as empirically proven by science, rather there was time infinitely in the past.
The human mind is unable to image a universe where there is no space and time. Image a box that has nothing in it. The space in that box is empty, but this does not mean that there is no space in the box. The same with time; imagine a universe where there is no time that flows linearly. It is impossible to image. The way our minds interpret our experience is by having space and having time. Those who believe that time is infinite, call upon their human experience, which tells them that imagining the contrary is impossible.

New scientific evidence from Time Magazine in June 2001 shows that the big bang occurred 15 billion years ago. Before the big bang there was no space and time. It is impossible for our human minds to comprehend what happened before the big bang, refer to the box again, we can only think of empty space not no space. It is also impossible for us to think of time that does not flow literarily. Time started when the big bang occurred and the big bang occurred everywhere at one time. Then all the matter and energy that the universe can use during its existence was created at the time the big bang occurred. A type of anti-matter pushes all the galaxies and solar systems away from each other. The speed at which this occurs is constantly getting faster, pushing galaxies and solar systems further and further apart. But these galaxies and solar systems are not moving into space that never existed. Outer space must be thought of as having positive curvature. A good way to image the way outer space is shaped by taking a piece of paper and making both ends touch each other. If something traveled in a straight line going further and further into space, it would in theory end up back where it started. So again in theory, a galaxy could end up exactly where it started at the dawn of time if it kept moving in the same direction. This will not happen because before this could occur, all the energy that the big bang created will be used up. Eventually the universe would enter a dark era. The only thing that will be left is cosmic waste. There will be no light and no energy 10^100 trillion years from now, just burnt-out cylinders of stars and dead planets. Eventually, all the matter will collapse into black holes then the black holes will disintegrate that matter into particles. These particles will bind together to form big atoms larger than the size of our universe. That’s the end. There will still be space, there will still be time, and there was a beginning to both. Something must have caused this universe to exist and the cause has to be both spaceless and timeless. The cause had to have been able to function where there is no space, which is unimaginable, and with no time which is also unimaginable.

It was not a freak coincidence that life can flourish on Earth and there was a cause to the universe that our planet is apart of. Barr showed evidence of how anthropic coincidences such the process of how chemicals came into existence and the necessity of quantum mechanics were both needed to function exactly as they do to allow life to exist. With scientific evidence showing how the universe both began and how it will end proves that the universe had a beginning in time but will have no end in time. Everything with a beginning in time has a first cause that the first cause of the universe had to be both timeles

2007-09-07 13:15:26 · 8 answers · asked by Anonymous in Astronomy & Space

I have a homework question that asks me to find an example of junk science and explain why it is junk science. I'm having trouble finding an example of junk science. It cannot be related to global warming, greenhouse effect, or DDT. Can someone please show me an actual article full of junk science, or a product webpage that shows that the product is backed by junk science? Please don't just name something; I need an actual source.

2007-09-07 13:12:43 · 4 answers · asked by petlover948 3 in Other - Science

A car manufacture tests its cars for front end collision by hauling them up on a crane and dropping them from a certain height.
a.) show what the speed just before a car hits the ground, after falling from rest a vertical distance H, is given by (Square root of 2gH) what height correspinds to a collision at (b.) 50km/h? (c.) 100 km/h

2007-09-07 13:12:22 · 3 answers · asked by Anonymous in Mathematics

2007-09-07 13:12:08 · 13 answers · asked by lax 1 in Earth Sciences & Geology

Let the car's initial velocity be +16.0 m/s, and the acceleration be -1.6 m/s2. What is the total distance traveled 20 s?

2007-09-07 13:11:06 · 2 answers · asked by Anonymous in Physics

2007-09-07 13:10:27 · 3 answers · asked by Anonymous in Weather

2007-09-07 12:54:59 · 13 answers · asked by Anonymous in Mathematics

wat do these mean and how do i solve these?

"add the sum of 3x^2-5x+3 and -2x^2+6 to x2-x-1"

"subtract 3x^2+2x-5 from the sum of 2x^2-3x+2 and 4x^2+6x+3"

2007-09-07 12:54:58 · 8 answers · asked by Anonymous in Mathematics

I know that you can use percentage error to compare the correct accepted value of one value with the average you got. But what formula would I use to compare a set of 6 results (3 from 2 people each) in terms of accuracy and precision?

2007-09-07 12:50:30 · 2 answers · asked by Anonymous in Chemistry

I only smoke weed, but I do it daily. Problem is I could be asked to go take it at any time. Any advice? And you can leave your thoughts about quitting to yourself, thanks.

2007-09-07 12:45:04 · 18 answers · asked by Anonymous in Medicine

I'm trying to be more careful in how I ask this one, since I offended some with a prior question. Hopefully this is okay.

If you hold yourself out as having paranormal abilities, why have you not located either of these individuals? The world is interested in tracking down each of the.

Would this not be within the ability of a psychic? Do you just not feel like it?

2007-09-07 12:44:06 · 11 answers · asked by Bill 6 in Parapsychology

calculate the power in watts that must be supplied to a 40-gallon electric water heater to raise the temperature of a tank of water from 50 degrees to 150 degrees in 2 hours. assume that no heat is wasted.( 1 gallo= 8 1/3 pounds) calculate the cost of heating the water at $0.04 per kilo watt per hour?

thanks and can you show me a solution too
again thanks a lot.

2007-09-07 12:42:14 · 1 answers · asked by nic 5 in Engineering

MEDIUM - hard baseballs
1. What are the characteristics of this medium(i.e.density, elasticity, compressibility, and bulk modulus)?


2. What would happen to your hand on the other end of a group of baseballs after they were struck with a hammer? Did you feel more pressure when compared to the water balloons? why?


3. Is this medium good for energy propagation, prove it through supporting references.

2007-09-07 12:39:32 · 1 answers · asked by jamal12pk 1 in Physics

The velocity function is v(t)= t^2-6t+8 for a particle moving along a line. Find the displacement and the distance traveled by the particle during the time interval [0,5].

2007-09-07 12:38:16 · 5 answers · asked by Mr. Rain 1 in Mathematics

given an infinite amount of time, then why does the universe still exist? I mean, is it not possible for the universe to be annihilated at some point? And if so, should it not exist anymore?

2007-09-07 12:35:12 · 11 answers · asked by munhasen5 2 in Astronomy & Space

You are selling cases of mixed nuts and roasted peanuts. You can order no more than 400 pieces (cans of mixed nuts nad packages of roasted peanuts) and spend no more than $500. Mixed nuts cost $24/case, contain 12 cans and give you a profit of $20/case. Roasted peanuts cost $15/case, contain 20 packages and give a profit of $15/case. How many cases of each should you buy to maximize profit? What is your maximum profit?

2007-09-07 12:34:05 · 5 answers · asked by luckeyme3 1 in Mathematics

Supposed that you float into the air stationary facing north for 12 hrs. Will you still be facing north and will you land in a different location considering that the Earth rotates?

2007-09-07 12:32:17 · 2 answers · asked by Anonymous in Other - Science

2007-09-07 12:14:06 · 9 answers · asked by Gamer [Girl] 2 in Astronomy & Space

Calcite, Plagioclase, Hornblende, Galena, Quartz, Halite, Fluorite, Orthoclase, Biotite, Sphalerite

2007-09-07 12:11:15 · 3 answers · asked by Macgyver with Crosby 4 in Earth Sciences & Geology

=]

2007-09-07 12:08:47 · 13 answers · asked by Anonymous in Biology

Hi! This is a sample question from the math SAT II (level 2) test.

It says:

The number of hours of daylight, d, in Hartsville, can be modeled by:

d = (35/3) + (7/3)sin([2pi/365] * t), where t is the number of days after March 21. The day with the greatest number of daylight hours has how many MORE daylight hours than May 1?

How do you solve that?! I don't know how to find the maximum value of a trigonometric function (only a quadratic function). Please help! I'll pick a best answer TODAY! Thank you so much!

2007-09-07 12:02:38 · 3 answers · asked by Anonymous in Mathematics

My mother divides one hundred thousand pesos in 3 investments: @ four %, five % and @ six % respectively. Her?
income is four thousand nine hundred pesos. Her income from 5% and 6% investments exceeds the income @ 4% by P2500.00.

FIND: how much is invested @ each rate?

You may also just write the equations...

no need for solutions.

clue: this problem is in 3 equations with 3 unknowns (obviously).

No one got this right, so I'm gonna give others a chance,,,


good luck!

2007-09-07 11:54:56 · 1 answers · asked by Sammy 1 in Mathematics

2007-09-07 11:52:56 · 5 answers · asked by Michael C 1 in Astronomy & Space

The water in Red Creek is colder than the water in Meadow Lake, even though the two bodies of water are within a few hundred meters of each other.....
how can that be????

2007-09-07 11:47:25 · 5 answers · asked by Anonymous in Earth Sciences & Geology

volume of seawater (in liters) needed to extract 2.2 X 104 tons of K. (Density of seawater is 1.03 g/mL.)

2007-09-07 11:41:45 · 2 answers · asked by lillil 2 in Chemistry