Science & Mathematics - 11 October 2007

Our sun is big. But compare to some of these known stars, the sun is relatively small. What makes these stars so big? Is it just more matters and different gravitational pull? Please share your thoughts. Thanks :)

http://www.youtube.com/watch?v=YL4cFjmnQT8
http://en.wikipedia.org/wiki/List_of_largest_stars

2007-10-11 09:49:45 · 3 answers · asked by Sandy ♥ - semi retired :) 7 in Astronomy & Space

A gymnast of mass 70.0 kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch.

A) Calculate the tension T in the rope if the gymnast hangs motionless on the rope.
Express your answer in newtons.

B) Calculate the tension T in the rope if the gymnast climbs the rope at a constant rate.
Express your answer in newtons.

C) Calculate the tension T in the rope if the gymnast climbs up the rope with an upward acceleration of magnitude 1.30 m/s^2.
Express your answer in newtons.

D) Calculate the tension T in the rope if the gymnast slides down the rope with a downward acceleration of magnitude 1.30 m/s^2.
Express your answer in newtons.

2007-10-11 09:49:19 · 1 answers · asked by Nick S 1 in Physics

Which isotope of oxygen is most likely to be a β emitter?




a. 15O

b. 16O

c. 17O

d. 19O

2007-10-11 09:49:06 · 4 answers · asked by ee101202 1 in Chemistry

2007-10-11 09:48:24 · 3 answers · asked by Nick L 1 in Biology

in a freshmen science class we've been having trouble with this question. if anyone could give us a breif detailed explanation that'd be awesome, thanks!

2007-10-11 09:47:52 · 2 answers · asked by ? 1 in Earth Sciences & Geology

2007-10-11 09:46:59 · 10 answers · asked by adubb408 2 in Mathematics

2007-10-11 09:45:38 · 11 answers · asked by AirGear/GSD Fan 1 in Other - Science

Why is oxygen an ideal electron acceptor in cellular respiration? I would guess it's because of its electronegativity but I'm not sure.

2007-10-11 09:45:29 · 3 answers · asked by cryptedchaos 4 in Biology

what elements are found in carbohydrates, lipids, proteins, and nucleic acids? i cants seem to understand this biology stuff.

2007-10-11 09:43:36 · 6 answers · asked by cuban cutie 5 in Biology

Wondering How To Get My Daughter Interested In Codes And Such As Games To Help Her. With Problem Solving And Other Skills, She Can Take With Her Into The World. Shes Only 6 Years Old. But We Need More Females In Science & Mathematics. Its Never To Young To Start And World Would Be Lot Better Place. With A Women Using Her Head To Make A Difference, I Want Her To Be Whatever She Wants To Be.

2007-10-11 09:42:30 · 3 answers · asked by TomKat 2 in Other - Science

When The reciprocal of a positive number is added to the reciprocal of 12, the sum is the reciprocal of two less than the original number?What is the number?

I need step by step Process because i am So0o0o Confused

2007-10-11 09:41:34 · 7 answers · asked by The Kidd 1 in Mathematics

22.4 = 56a / 5a + 10



the value of a please

2007-10-11 09:40:47 · 7 answers · asked by Anonymous in Mathematics

Any help on this physics homework problem is appreciated. I've tried it and have no idea how to properly relate the energy equations to this scenario.

An engine-less space capsule is launched from the surface of the Earth and travels into space until it experiences essentially zero gravitational force from the Earth. The initial speed of the capsule is 18,500 m/s. What is its final speed? Assume no significant gravitational forces from other solar system bodies. Mass of Earth = 5.97e24 kg. Radius of Earth = 6.38e6 m.

2007-10-11 09:40:36 · 1 answers · asked by slay_09 2 in Physics

Just a simple sentence that's all!

Thanks!

:)

..x

2007-10-11 09:38:43 · 5 answers · asked by MUSE 2 in Biology

2007-10-11 09:36:26 · 17 answers · asked by Anonymous in Biology

2007-10-11 09:31:06 · 3 answers · asked by Anonymous in Chemistry

basically i know that in snooker or billiards or pool when you hit the cue ball at a stationary object ball the paths they follow after collision are at right angles to each other. i was wondering if anybody knew any mathematical proof that shows that this is true.

2007-10-11 09:29:40 · 9 answers · asked by neil 2 in Physics

So I was in SF at the Mezanine parking garage, across from the Metreon waiting in the car for my boyfriend to pay for our parking, and I got bored so I decided to take a picture. I looked at it when we got home and noticed a super weird light. I couldn't figure out where any of it came from, and I started thinking about how sometimes paranormal activity shows up in pictures and stuff...could that be it? I'm looking for anybody that knows anything about this stuff -- thanks. Heres the picture.

http://i147.photobucket.com/albums/r281/lisalashes87/random001Small.jpg

2007-10-11 09:28:35 · 16 answers · asked by lisalashes87 2 in Paranormal Phenomena

i know the difference in time between grentich and other county depends on the locaion of that country i.e the latitude, but when i see some countries are different in latitude but still have diffenence in time , need mor explanation.

2007-10-11 09:27:33 · 2 answers · asked by all our love is through god only 1 in Geography

How long does water have to sit out for bacteria to form?

2007-10-11 09:24:32 · 2 answers · asked by lm 2 in Biology

8. Solve the problem.
Four students drive to school in the same car. The students claim they were late to school and missed a test because of a flat tire. On the makeup test, the instructor asks the students to Identify the tire that went flat; front driver’s side, front passenger’s side, rear driver’s side, or rear passenger’s side. If the students didn’t really have a flat tire and each randomly selects a tire, what is the probability that all four students select the same tire?

A.1/8
B.1/4
C.1/64
D.1/256

9. Solve the problem.
Decide if the events A and B are mutually exclusive or not mutually exclusive. A card is drawn from a standard deck
of 52 playing cards.

*The result is a 7.
*The result is a jack.

A. mutually exclusive
B. not mutually exclusive

10. Solve the problem.
A card is drawn from a standard deck of 52 playing cards. Find the probability that the card is an ace or a black card.

A. 15/26
B. 29/52
C. 4/13
D. 7/13

2007-10-11 09:23:10 · 3 answers · asked by wobble692001 1 in Mathematics

Thin discs of fresh potato were cut and separated into batches of ten. Each batch was weighed and placed into one of the six different concentrations of salt solution. Fifteen minutes later the discs were removed, any surface liquid wiped off and then the discs were reweighed. Why would discs left in distilled water not change its mass?

2007-10-11 09:14:29 · 12 answers · asked by Salsa034848 2 in Biology

((1+ i)/(root3 + i)) all to power 6

2007-10-11 09:13:05 · 4 answers · asked by The Fresh Prince 4 in Mathematics

2007-10-11 09:11:59 · 10 answers · asked by collector_cliff 3 in Zoology

2007-10-11 09:11:47 · 8 answers · asked by Anonymous in Zoology

can some one tell me how to do this? thanks

2007-10-11 09:10:56 · 3 answers · asked by Stephen A 2 in Mathematics

2007-10-11 09:10:41 · 5 answers · asked by Anonymous in Mathematics

A ball if thrown vertically upward with a speed of 1.53m/s from a point 4.21m above the ground. Calculate the time at which the ball will reach the ground. Include all the numbers and formulas you use to find the answer, even our teacher couldnt figure it out.

2007-10-11 09:05:15 · 5 answers · asked by Matt K 2 in Physics

If humans at one time could travel at the speed of light and made their way across the galaxy, then the world wich they have left would be completely diffrent then the world at which they returned. If this is the case it answers many of the unaswered questions from the items that we have found from the past. Such as the Crystal Skulls from the Myans and the Pyramids found across the world. If the world at one time was advanced and was hit by a meteor or such, it would change the axis. The world at which we are walking now was at once the artic and the artic at one time was the Rainforests of yesterday. When Humans are displaced they make what is comfortable to them and what they know. This is why we find Pyramids across the world. If you lost everything you would still build a house and a bed however you would have lost the ability to create the elaborate creations of which you once had. Just Think about

2007-10-11 09:04:23 · 7 answers · asked by truckeroif2 1 in Astronomy & Space

2007-10-11 09:02:29 · 4 answers · asked by Anonymous in Physics