Science & Mathematics - 25 October 2007

what is x? 2^(x-1)=log[3]81^2

The answer i got was x=4. I was just wondering if this was correct??

Thanks in advance!

2007-10-25 04:02:04 · 6 answers · asked by Anonymous in Mathematics

How would i factor this equation ?

1. 9x^2 = 16

2007-10-25 03:57:26 · 6 answers · asked by Anonymous in Mathematics

(a) y = -7x*(-5/3)

(b) y = -(1/x^2) - sqroot x + (1/2)

(c) y = (x^3 + 4)(-x^6 + x^4) (Use Product rule?)

(d) y = (sqroot x + (1/2))(x^3 + x^(1/3) (Use product rule?)

(e) y = 2x^3 + 4 / x + 7

(f) y = x^(2/3) + 3 / x^(1/5) + x

I don't even know which rules to use where, or what the product rule is.

2007-10-25 03:56:03 · 3 answers · asked by Anonymous in Mathematics

In a tennis match, a player wins a point by hitting the ball sharply to the ground on the opponent's side of the net.

If the ball bounces upward from the ground with a speed of 18 m/s and is caught by a fan in the stands with a speed of 12 m/s, how high above the court is the fan? Ignore air resistance.

Help please. I just can't figure this one out.

2007-10-25 03:56:00 · 4 answers · asked by Imagine 1 in Physics

Find the 1800th derivative of f(x) = xe^-x.

2007-10-25 03:55:54 · 3 answers · asked by lady_divine@sbcglobal.net 1 in Mathematics

I am quite confused with this. I have asked this question earlier in a different way for which I was badly ridiculed. I really want to know the truth behind this. Is everyone one in this world inclined to procreate? Is there a strong physical urge to do so? Pleasde help. I am quite confused. I wish I never have children. I would be lot more happier without them? I have seen many woman worry a lot when they finf out they cannot conceive. Is this the same for men? Is it a biological urge?

2007-10-25 03:52:02 · 8 answers · asked by Pratap 3 in Biology

2007-10-25 03:50:45 · 2 answers · asked by goodmoyojo 1 in Other - Science

2007-10-25 03:49:52 · 4 answers · asked by goodmoyojo 1 in Mathematics

(continued) polar covalent bond

2007-10-25 03:47:13 · 2 answers · asked by kleenexpocketpack 1 in Chemistry

2007-10-25 03:43:10 · 0 answers · asked by Anonymous in Geography

Would we really have a chance at blowing up a global-killer comet or asteroid? Would there be enough time to land on it and drill a hole, would it blow apart or change its trajectory, would we be able to stay in contact with the astronaut drillers while they were working, etc….

2007-10-25 03:38:27 · 11 answers · asked by BR 3 in Astronomy & Space

home if they want to reach school,which is 5km away, at the same time?

2007-10-25 03:32:17 · 3 answers · asked by sakira 1 in Mathematics

A. electrons
B. protons
C. neutrons
D. nothing

2007-10-25 03:28:33 · 6 answers · asked by Broken Blue Eyes 6 in Physics

Are you sure a micro tape recorder [those mini one's] wouldn't work?
and a local paranormal researcher investigation group advised me to use an old fashioned one. However I'd prefer to just leave one there over night and it'll automatically come on IF there is any sound or a voice,ect
pls advise thanks

2007-10-25 03:27:00 · 7 answers · asked by fancypantsy 3 in Paranormal Phenomena

Show the conversion factors also.

2007-10-25 03:25:54 · 9 answers · asked by Ryoma Echizen 3 in Mathematics

Do you ever do lazo thing like cowboy?
Well the system is if we have a mirror like far far away and think we if we have it around the galaxy?
Then human spacship has a magnet laser shooting at this mirror thing. will the spaceship move?
The laser magnet are just fantasy and who knows mybe other will find solution for this magnet laser fantasy.
Remem it is just a theory..............OK.

2007-10-25 03:23:02 · 7 answers · asked by Anonymous in Astronomy & Space

2007-10-25 03:22:14 · 3 answers · asked by li_showz 1 in Engineering

A cart with mass 200. g has a velocity of 0.30 m/s in the positive x direction. What is the momentum of the cart?
This cart collides with a stationary cart of mass 400 g.
If the velocity of the first cart is -0.1000 m/s after the collision, what is the velocity of the second cart after the collision?What type of collision is this?

2007-10-25 03:21:10 · 2 answers · asked by Natiphy2007 1 in Physics

During a moon landing, one of the experiments performed was the measurement of the intensity of solar wind. As a collector, an aluminum strip of about 3,000.000 square centimeters was used. It was found that in 100.00 minutes, a mass of 3.00 x 10^-10g of hydrogen was collected. What is the intensity of the solar wind (number of atoms per sq. centimeter per second?).

2007-10-25 03:18:02 · 1 answers · asked by Caramel 2 in Chemistry

what risks are assioated with coal mining and what makes it so dangerous? is the pay good or is it not worth it?

2007-10-25 03:17:07 · 3 answers · asked by Elyse 2 in Earth Sciences & Geology

We know our three existing dimensions are length, width and height... but what would the fourth dimension be? Time?

How can we comprehend other dimensions beyond that?

2007-10-25 03:15:30 · 5 answers · asked by Anonymous in Physics

Note that this is NOT CHEATING. My teacher doesn't exactly explain everything so well so I need this for my notes. I need every postulate and theorem up to section 3.3 in the McDougal Littel Geometry textbook.

2007-10-25 03:12:25 · 2 answers · asked by Miss Confused 1 in Mathematics

There would be a small heater and blower motor installed in your plenum. The heater,a 150 watt light bulb, would draw 150 watts. The blower motor would draw 176 watts.

I am thinking of experimenting with this heater in my 1000 square foot home. The proposed system would utilize the ducting installed in my home for the oil fired hot air furnace. Inside the hot air plenum would be placed two incandescent flood lamps, each maybe 150 watt bulbs. The heater wattages could be increased to two 150 watt bulbs as necessary to keep up with demand for heat. Also there would be a small 176 watt blower motor, the kind you use in an air purifier unit. The idea is to produce just enough air flow and heat so that this furnace runs continuously to keep up with demand for heat, so as to avoid start up currents and start stop wear and tear on parts.

My calculations, and I would like for you to check them if possible, show that I would be consuming 326 watts per hour or .326kwh. If the system was running continuously for 24 hours a day(7.824KWH per day), 30 days a month(234.72KWH per month), @.09 per KWH it would cost .09 x 234.72KWH or $21.12 per month. How is that for a heating bill?

I am unsure as to whether running continuously it will keep up with the heat demand for a 68 degree temperature in my home? Any experts out there? Anything like this on the market now for furnaces?

2007-10-25 03:07:57 · 1 answers · asked by Anonymous in Physics

1. The Origin of sand is_______.
2. Which soil particle would be most likely moved by water?_________
3. What are two disadvantages of having a clay soil compared to having a sandy soil?
4. Explain what the difference is between gravitational water, capillary water, and hygroscopic water.

Thank you!!!

2007-10-25 03:07:01 · 1 answers · asked by ♥Anonymous♥ 2 in Earth Sciences & Geology

using spectroscopy

2007-10-25 03:04:23 · 2 answers · asked by sassybrat_018 1 in Chemistry

The probability of beneficial mutations occurring simultaneously in multiple chromosomes of a single cell is extremely low. The probability of the same mutations occurring simultaneously in all cells of a multi-cell organism, is even lower. Needless to say, such random beneficial mutations have never been observed in the lab or in nature. To compensate for the low probability, biologists tend to take the approach of "given enough time it might happen." That's about as convincing as saying that given enough time, a monkey with a typewriter will produce all the writings of Shakespeare. With this premise, biologists have developed various models which yield "millions of years" as the time necessary for such "evolutionary mutations" to occur. Then, once such a time length has been calculated, we find in biology textbooks statements like: "Humans and monkeys evolved from a common ancestor 3 million years ago", as if this was a well established scientific fact. Where is intellectual honesty?

2007-10-25 03:01:35 · 7 answers · asked by brandlet 2 in Biology

I know that snakes can, what about other animals?

2007-10-25 02:59:26 · 3 answers · asked by Anonymous in Biology

2007-10-25 02:57:22 · 8 answers · asked by colin ? 1 in Astronomy & Space

2007-10-25 02:56:40 · 4 answers · asked by Anonymous in Weather

2007-10-25 02:54:52 · 12 answers · asked by MANDY 1 in Mathematics