Science & Mathematics - 27 November 2007

Hopping into your car, you floor it and accelerate at 9.1 m/s^2 without spinning the tires. Determine the minimum coefficient of static friction between the tires and the road needed to make this possible.

Please show/explain all work clearly please!

2007-11-27 10:35:13 · 3 answers · asked by nirmal 1 in Physics

Can you not see a certain colour or not actually differentiate between them?

2007-11-27 10:33:34 · 3 answers · asked by Anonymous in Medicine

A box is pulled at an angle of 37 degrees about the horizontal with a force of 50 N. The mass of the box is 40 kg and the coefficient of friction is 0.4. Calculate the quanties for the blanks below.

weight ________
F(subscript x) ___________
Normal force (W - Fsubcript y) _________
F (force of friction) __________
F(subscript net) ___________
Acceleration ___________

Please show/explain all work clearly please!

2007-11-27 10:33:28 · 1 answers · asked by nirmal 1 in Physics

and give reasons why.

2007-11-27 10:33:16 · 30 answers · asked by Anonymous in Astronomy & Space

LIGO and LISA are set up to detect gravitons as if they were very sparse. If all masses are interacting via gravitons, shouldn't there be a lot of them?

Maybe what I'm asking is: is this just a matter of weeding them out among the effects of other things (which would explain why LISA is waiting for a massive event)? or are they actually that spread out (then why?)?

2007-11-27 10:32:15 · 5 answers · asked by iMi 4 in Physics

and how do we know that?

2007-11-27 10:28:42 · 6 answers · asked by Dean W 1 in Astronomy & Space

2007-11-27 10:28:20 · 9 answers · asked by Dean W 1 in Physics

Hi ok so I have a question. The earth pulls down on you. The floor pushes up on you, so you don't move. Explain why these two forces are NOT an action-reaction pair of forces. THANK YOU, 10 PTS.

2007-11-27 10:27:03 · 6 answers · asked by Jazzy 1 in Physics

If a smell receptor must be in contact with a scent molecule in order to "smell" something, how does it get rid of that molecule in order to detect a new scent molecule.

2007-11-27 10:26:05 · 1 answers · asked by californiainfidel 3 in Biology

why have the planets been orbiting the sun for the last 4.5 billion years (2 reasons)

best answer 10 pts
ive been looking evrywhere for the answers

2007-11-27 10:24:59 · 3 answers · asked by ♥megan♥ 2 in Astronomy & Space

It takes 1200J of work to lift the car high enough to change a tire. How much work must be done by the person operating the jack if the jack is 25 percent effecient?

A windmill has an effeciency of 37.5 percent. If a gust of wind does 125J of work on the blades of the windmill, how much output work can the windmill do as a result of the gust?

Please WORK OUT THANKYUO

2007-11-27 10:23:21 · 1 answers · asked by abdo94 1 in Physics

We did a height function problem today which stated that a batter hit a baseball ball directly upward at an initial velocity of 96 ft/sec. We were to find the usual total time in air, max height, etc...all of which we did...

But one of my students vehemently argued that the "hit directly upward" was not even possible. Can anyone help clarify the reasonableness of this word problem?

2007-11-27 10:18:52 · 6 answers · asked by Anonymous in Physics

during ice ages did the sea level rise or decrease? thanks for any help!

2007-11-27 10:18:35 · 3 answers · asked by xodanceox 2 in Weather

Using the distance formula, determine the absolute magnitude of the sun. If the sun were 10 parsecs away, would we be able to see it in the night sky with the naked eye?

2007-11-27 10:18:29 · 1 answers · asked by scott j 1 in Astronomy & Space

How do you do these inverses. can you please explain each problem so I know how to do them in the future?? Thanks..

g(x) = (4/3)x - 7/3

h(x) = (18x + 2)/10

f(x) = (2/9)x - 1/9

2007-11-27 10:17:59 · 5 answers · asked by Jaz 'ma' Taz 2 in Mathematics

If you were looking to purchase a microscope, what would be 5 features that you would look for and why?

2007-11-27 10:17:33 · 2 answers · asked by Grace L 1 in Biology

Why are most crystals not perfect?

2007-11-27 10:12:33 · 2 answers · asked by Jeanette50 1 in Earth Sciences & Geology

2007-11-27 10:12:16 · 3 answers · asked by Bader A 1 in Physics

:]

2007-11-27 10:11:36 · 14 answers · asked by Jenny B 1 in Zoology

Summer solstice is the time of year with the longest day and shortest night. Winter solstice has the shortest day and the longest night

2007-11-27 10:11:27 · 3 answers · asked by Panaskysue 1 in Weather

Calculate the approximation for the given function and interval

L5, f(x)=x^2+3|x| [-3,2]

can someone explain how to do this?

I'd greatly appreciate it. Thanks.

2007-11-27 10:10:33 · 1 answers · asked by yefimthegreat 1 in Mathematics

Has anyone ever used Rockwool to root cuttings. I am fairly new at this, but at my first attempt have had MUCH better results. What I need to know is, what about when the roots get tangled in the wool? Is there a way to make the removal process more gentle on the roots? Any advice about Rockwool in general would be greatly appreciated as this will probably be my only choice to rooting cuttings in the future.

2007-11-27 10:09:30 · 1 answers · asked by portiaraylee 2 in Botany

and does know any websites for this?

2007-11-27 10:09:12 · 1 answers · asked by Fred 1 in Biology

how would one go about solving a logarithmic problem with logarithms that have different bases? for example:

(since i don't know how to make the little numbers just assume the number immediately following the log is little)

log3 9 - log5 125 + log7 49 - log11 1 = ?

how can i solve a problem like this?

2007-11-27 10:08:07 · 3 answers · asked by Anonymous in Mathematics

MIT, Princeton....any others with great physics programs? Thanks!

2007-11-27 10:05:56 · 1 answers · asked by pianotime 3 in Physics

my mother is having a surgery tomorrow and i would like to know what to expect and what the recovery time and healing time is thank you

2007-11-27 10:00:58 · 8 answers · asked by Anonymous in Medicine

Gallium, used primarily in semiconductors and light emitting diodes (LED's), is a soft, silver-colored metal.

2007-11-27 10:00:37 · 4 answers · asked by chica magneta 1 in Chemistry

A bag contains a total of 24 red and green pappers. the probability of reaching into the bag and choosing a red pepper is 2/3. How many peppers of each color are in the bag?

2007-11-27 09:53:53 · 2 answers · asked by Anonymous in Mathematics

What exactly is a prion? How can something that isn't alive "eat" a cow's nervous system and how could something that isn't alive be passed along from one cow to another and apparently "multiply" themselves. I'm not sure that multiply is the right word, but at what rate do they replicate themselves.

2007-11-27 09:53:28 · 6 answers · asked by Anonymous in Biology

Please help, What does this mean?

Sample Problem.

7-24-25

What does it want me to do.
Due in one day and need help bad.
Google doesn't help and my parents can't do this stuff.

2007-11-27 09:50:33 · 3 answers · asked by Anonymous in Mathematics