Science & Mathematics - 16 December 2007

2007-12-16 16:50:29 · 4 answers · asked by allen 2 in Mathematics

It certainly takes tremendous energy to cling endlessly to the fridge by magnetic energy.
Science tells us, such an expenditure of energy requires that a power source be drawn upon to support such effort. there isn’t a power source in sight!

2007-12-16 16:48:23 · 9 answers · asked by Anonymous in Other - Alternative

log y (little y down) 27 = 3
a. 27^y = 3
b. y^3 = 27

2007-12-16 16:48:17 · 3 answers · asked by Jason S 1 in Mathematics

A particle is traveling along a straight line, and its distance from the original is given by the equation:

s(t)=t^3 +12t^2 +36t + 4
where t is greater than or equal to 0.

a. What is the average velocity of the particle on the interval [3, 6] ?

b. Find c in [3, 6] so the velocity at c is equal to the average velocity you found in the pervious question.

c.When is the particle's acceleration positive? negative?

d. When is the particle speeding up? slowing down?

CAN YOU PLEASE PROVIDE WORK so i understand how to do it myself next time?! thanksss a bunch!

2007-12-16 16:44:58 · 2 answers · asked by Anonymous in Mathematics

Could someone please help me with this problem, as I do not understand it. Here it is,

2NH4NO3 --------> 2N2 + 4H2O + O2

What is the total number of liters of gas formed when 228 G NH4NO3 is decomposed? (Assume STP.)

2007-12-16 16:44:01 · 5 answers · asked by Anonymous in Chemistry

The answer key says 6.43 x 10^23 atoms but I keep getting 8.29 x10^23, am i doing anything wrong here?

2007-12-16 16:43:02 · 3 answers · asked by fallingout13 2 in Chemistry

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2007-12-16 16:41:04 · 9 answers · asked by zoe13faye 2 in Mathematics

2007-12-16 16:37:30 · 32 answers · asked by d c 2 in Earth Sciences & Geology

2007-12-16 16:37:11 · 1 answers · asked by Anonymous in Mathematics

scully discovered a ufo. she estimated that the ufo had a mass of 2500 kg traveling at 3600m/min. what is the momentum of the ufo?

a. 11.5 x 10^5 kg m/s
b. 1.5 x 10^4 kg m/s
c. 15,000
d. scully cannot determine the momentum from the information provided

2007-12-16 16:30:18 · 2 answers · asked by Anonymous in Physics

I heard that this can be done, but wanted to check with someone first.

2007-12-16 16:29:45 · 9 answers · asked by mrbirddawg 1 in Astronomy & Space

A) iron.

B) uranium.

C) lead.

D) hydrogen.

E) plutonium.

2007-12-16 16:25:28 · 8 answers · asked by GC8 1 in Physics

2007-12-16 16:22:11 · 8 answers · asked by airforcewife64 3 in Astronomy & Space

a scientist uses a ruler and take these measurements of the length of a desk: 10.8, 11.0, 10.9, 10.9 and 11.2. but the actual length of the table is 12.2. Are these measurement accurate or precise? Why?

2007-12-16 16:21:44 · 5 answers · asked by muzuizui 2 in Chemistry

How do you solve this?

2007-12-16 16:20:07 · 2 answers · asked by Ravioli 2 in Mathematics

oaky so i really need your help. Im writing a 10 page essay about acid rain. and we need 5-8 resources (he said try and get books, but i dont have time so im just going with all online resources.) OKAY SO... PLEASEPLEASEPLEASE i need 5-8-or more would be great resources about acid rain, i already have the EPA address, thats my only one, i really need your help. THANKSS!!!!!!!!!!!
ILOVEYOUALLFORDOINGTHIS!!!!!!

2007-12-16 16:17:27 · 2 answers · asked by Anonymous in Weather

a golfer can hit a golf ball a horizontal distance of over 300 m on a good drive. what maximum height would a 301.5 m drive reach if it were launched at an angle of 25.0 degrees to the ground?

a. 140.6 m
b. 70.3 m
c. 150.8 m
d. 332 m

huh??!?

2007-12-16 16:15:45 · 3 answers · asked by Anonymous in Physics

for eg. use $22.48/hr and Hours are 8:00am – 5:00pm, Monday – Friday ... can you show me how much i would make a year if i made that???

show me how to find out please.
****DONT GIVE ME A STRAIGHT ANSWER, LIKE THE EXACT AMOUNT*****

2007-12-16 16:11:48 · 9 answers · asked by Anonymous in Mathematics

The distance between two points is 7, the points are (5, 2) and (x, 4); what is x?

2007-12-16 16:10:30 · 8 answers · asked by Anonymous in Mathematics

1. When I was in high school, and right after my grandmother passed, I arrived home one day after school. Went downstairs put a load of clothes in. Heard a woman say my name and I thought it was my mom so I yelled upstairs that I was in the basement. This happened twice again as she called my two more times. When I went upstairs I said aloud "Didn't you hear me. I said I was downstairs." No one was there.

2. One night after putting my little brother to sleep, I was lying in bed trying to get to sleep. I remember being unable to move and a light sort of like moonlight on water was on my closet door and I heard what I thought was my grandmother call my name. It lasted for a few seconds. Then the light disappeared.

3. I used to stay with my mother and her fiance in his house after I came back from college. I was sleeping in the basement and I heard a sniffing around my face and I felt the sensation of something sniffing me. I couldn't move and didn't see anything.

2007-12-16 16:10:00 · 18 answers · asked by Cesaria Barbarossa 7 in Paranormal Phenomena

Help! I need to write A MAKE BELIVE STORY ON HUMAN MUTATIONS. My story must also include description of translation/MRNA/prcessing/translation/(steps/enzymes)

-Description of make believe mutation in the story
-How you get a mutation?
-Mutagens
-Types

2007-12-16 16:09:28 · 1 answers · asked by Anonymous in Biology

I type pretty fast. I don't THINK pretty fast, but 'slow and steady' don't cha know.

2007-12-16 16:08:00 · 6 answers · asked by Faesson 7 in Astronomy & Space

a 60 kg student on in-line skates is playing with a 25 kg ball. If the student is initially at rest then catches the ball thrown to the right at 4.5 m/s. Explain the change in the student's momentum?

a. no change
b. the student's momentum will be to the right
c. the momentum will be zero
d. the student's momentum will increase while the ball's momentum will decrease

2007-12-16 16:07:37 · 2 answers · asked by Anonymous in Physics

Could he return before his twin sister was born? Defend your answer.

2007-12-16 16:06:17 · 3 answers · asked by Anonymous in Physics

I want to build a unit large enough to be able to recharge a battery powering an inverter so I can run regular 110-120V appliances. I'm thinking something that will harness the rotational power of a bicycle (21+ gears) and move a magnet thru the solenoid (either direct rotation at the wheel, OR movement in a verticle tube and use an upward force to move the magnet up, with gravity pulling it back down, to simulate shaking) to generate the electricity to recharge a battery.

I'm wondering why this hasn't yet been done and think it could be impracticle if not impossible. But I can't get the idea out of my head.

Can anyone see anything wrong with this idea?
I have the battery (12v, 4.5 A) and inverter. I have a solar panel but that takes too much time to recharge.

2007-12-16 16:05:09 · 3 answers · asked by Piqchure 4 in Engineering

2007-12-16 16:04:12 · 4 answers · asked by Anonymous in Physics

just wondering since we need 8 hours, what about other creatures...is 8 hours long or short compare to other organisms.

2007-12-16 15:58:04 · 1 answers · asked by dorkyqueen 3 in Zoology

when rotating an egg it will be in round shape while seeing. our earth is rotating now. then what about our earth's real shape?

2007-12-16 15:54:20 · 3 answers · asked by sujitha J 1 in Earth Sciences & Geology

i know its kind of a dumb question but i'm just curious

2007-12-16 15:51:35 · 10 answers · asked by Renée 3 in Zoology

2007-12-16 15:50:36 · 6 answers · asked by Anonymous in Mathematics