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Author Topic: More Physics/Space Questions  (Read 809 times)

Offline Terror

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« on: January 06, 2005, 02:47:28 PM »
If the moon always has the same side pointed at the earth...

Does the moon rotate?

Does the "dark side of the moon" have a "daytime"?

The moon is getting a few cm farther from the earth each year, why?

Just to get the New Year brains to pumpin....
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Offline AKS\/\/ulfe

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« Reply #1 on: January 06, 2005, 02:51:09 PM »
Answers to the first two are yes. Third one, dunno... maybe we're travelling away from the moon? Oooooooooooooooooo
-SW
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Offline JB88

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« Reply #2 on: January 06, 2005, 03:06:59 PM »
a thought.

the earth is rotating at  just over 1000 miles per hour.  it is orbiting the sun at
about 67,000 miles per hour.  the sun, with the earth in orbit is travelling at 486,000 miles per hour around the spiral arm of the milky way which is travelling at
appx. 1.34 million miles per hour by one estimation.

is it possible that a more interesting question is:  how in the hell does it stay that close?

and why cant i feel my body moving at 1.34 million mph while spinning outrageously fast.

which you are.  right now.  this very second.

like a little whirlybird on crack.
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Offline SavedSaint

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« Reply #3 on: January 06, 2005, 03:09:41 PM »
interesting enough
the moon is about the size of texas.

what would happen if a comet hit the moon that was just 10 miles wide.

the moon would exploded.. and prob fall into the earths automosphere
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Offline JB88

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« Reply #4 on: January 06, 2005, 03:25:48 PM »
preferably onto texas.

: )
« Last Edit: January 06, 2005, 03:28:41 PM by JB88 »
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Offline Darkish

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« Reply #5 on: January 06, 2005, 03:29:37 PM »
Quote
Originally posted by SavedSaint
interesting enough
the moon is about the size of texas.

:rofl
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Offline SavedSaint

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« Reply #6 on: January 06, 2005, 03:38:16 PM »
best joke i told all day..

am i wrong..?
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Offline Darkish

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« Reply #7 on: January 06, 2005, 04:04:31 PM »
As I figure it:

Texas has an area of 270,000 square miles
The Earth's moon has a diameter of about 2160 miles or giving it an area of  14,657,414square miles


- Which makes the moon about 54 times bigger than Texas, not even going into the fact its a spherical body...

« Last Edit: January 06, 2005, 04:14:52 PM by Darkish »
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Offline JB88

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« Reply #8 on: January 06, 2005, 04:08:23 PM »
oh the stars at night are big and briiiiight...

(clap clap clap clap)

on the surface of the mooooooooon.
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Offline Terror

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« Reply #9 on: January 06, 2005, 04:09:51 PM »
Quote
Originally posted by SavedSaint
best joke i told all day..

am i wrong..?


Earth
Diameter:  12,756.3 km (7926 miles)
Surface Area:  197,359,320 sq miles  (4*pi*r^2) (right?)
Mass:  5.972e24 kg

Moon
Diameter:  3476 km  (2160miles)
Surface Area:  14,657,402 sq miles(4*pi*r^2) (right?)
Mass:  7.35e22 kg

Texas
Size:  801miles x 773miles (267,339 actual square miles)
Mass:  Alot, but not quite as much as the moon.

Texas is big, but not quite as big as the moon.

Terror
« Last Edit: January 06, 2005, 04:12:20 PM by Terror »
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Offline Holden McGroin

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« Reply #10 on: January 06, 2005, 04:13:04 PM »
Quote
Originally posted by JB88
...
and why cant i feel my body moving at 1.34 million mph while spinning outrageously fast...


Something to do with relativity.  You are moving with respect to what?  How do you know that you are not standing still and the objects you percieve as fixed are really moving by your fixed position?
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Offline Octavius

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« Reply #11 on: January 06, 2005, 04:14:04 PM »
1)  Yes

2)  Yes.  Think of the New moon phase (totally dark from earth).  The opposite side is illuminated by the sun.

What is the moon's tangential velocity?  If it's > than 11.2 km/sec, then there is your answer.  I dunno off the top of my head.

« Last Edit: January 06, 2005, 04:16:54 PM by Octavius »
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Offline Red Tail 444

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Re: More Physics/Space Questions
« Reply #12 on: January 06, 2005, 04:21:10 PM »
Quote
Originally posted by Terror
If the moon always has the same side pointed at the earth...

Does the moon rotate?

Does the "dark side of the moon" have a "daytime"?

The moon is getting a few cm farther from the earth each year, why?

Just to get the New Year brains to pumpin....


Yes, the dark side of the moon has a daytime, during our solar eclipse...

Regards,


PS, you ultra melons forgot that the moon separated from the earth on  september 13, 1999...why am I the only one who remembes these things?
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Offline JB88

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« Reply #13 on: January 06, 2005, 04:24:28 PM »
Quote
Originally posted by Holden McGroin
Something to do with relativity.  You are moving with respect to what?  How do you know that you are not standing still and the objects you percieve as fixed are really moving by your fixed position?



it is not the bullet that is moving, its your body travelling towards it.  the bullet is simply slowed relative to the earths velocity.
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Offline Terror

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« Reply #14 on: January 06, 2005, 05:02:18 PM »
> The moon is getting a few cm farther from the earth each year, why?

It actually has to do with tides.  The moon induces a "bulge" in the Earth, and since the Earth is spinning, this bulge is forced ahead of the Moon in relation to the Earth.  This bulge has mass, since it has mass, it has gravity, which adds energy to the Moons orbit.  A higher energy orbit equals a higher orbit.  BTW, The Moon's gravity also exerts force on the "bulge" which causes a decelleration to the rotation of the Earth.  Eventually, the Earth and the Moon will always have the same face towards each other.

Terror
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