Moon Definition and 1000 Threads

Here's a good exercise for you math whizzes (no, I don't know the answer): How stable (and what shape) would the orbit (around the Sun) of the Earth be if the moon was equal to the Earth in size and mass, but correspondingly further away so that the tidal effect would be the same as it is...

Woot! I was at a party on new years eve and at around 11:30 pm a lot of us climbed up onto the roof of the house (the house was HUGE :bugeye: ) and when I looked up, there was a clear halo around the moon. It was cool O_O. Anyway, a few hours later it was barely visible. It's just awesome...

Consider the following situation. We have an evacuated straw, one meter in diameter, closed at both ends (but the ends can be easily opened). One end is here at ground level on Earth, and the other is at ground level on the moon. Assume that the straw is strong enough to resist breaking. We...

I have been trying to understand how our ocean tides work and read about the effect of our moon's and sun's gravitation. I have learned there are diurnal, semi-durnal and mixed semi-diurnal tidal patterns When the moon is directly overhead equatorially (near side), I've seen illustrations...

A 1-kg mass at the Earth's surface is gravitationally attracted to Earth with a force of 9.8 N. Calculate the force of gravity with which the 1-kg mass on Earth is attracted to the moon. (The moon's mass is 7.4 x 10^22 kg) Would this be setup correctly? F=(G me mb)/r^2...

Is it because the moon is actually falling in free fall TOWARDS the Earth but it is moving in a circular path the same as the Earth's path??

A geologist finds that a moon rock whose mass is 7.85 kg has an apparent mass of 6.18 kg when submerged in water. What is the density of the rock Would I use pressure to solve for the mass of the moon rock?

the moon subtends an angle of 9.06 x 10^-3 radians amd os 3.84 x 10^8 meters from the earth. What is the approximate diameter of the moon. so i think it has something to do with formula R=S/theta but I'm not sure how to compare the moon and the Earth information to find the diameter of the...

Since our galaxy and the andromeda galaxy are drifting towards each other. How long will it take to look as big as the moon today in the night sky?

hey guys could anyone help me with this q? q)how would the timing and sequence of lunar phase change if the moon moved at the same speed around its orbit but in a different direction? i thought it would simply reverse the phases of the moon, but I think the answer needs to be more detailed...

The definition of work states that the object must move in the same direction as the force. W=Fd. I am contemplating whether or not the Earth is doing "work" on the moon. My answer would be no, because no energy is being transferred, and the moon stays at around the same height (we are assuming...

A cow attempts to jump over the moon, but insteads ended up in a orbit around the moon. How can the cow be used to determine mass of moon?

Worth taking a look at tonight. "Tonight's full Moon will be almost 12 percent bigger than some of the full Moons this year, according to NASA, setting up a fine viewing opportunity when it rises in the evening. The reason: The Moon is near perigee, the point on its slightly out-of-round...

is the same as the spring constant on Earth right? My reasoning is that since Force is directly proportional to displacement, the k would remain the same. But we don't know that k is constant so I don't think that is a solid proof...

The reason why we see the full face of the moon (when it is opposite to the sun) is the effect of diffraction of light around the spherical surface of the earth. Correct? There can't be another explanation since without diffraction, the moon should be dark just like when it is on the same side...

Has anyone heard of this? http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=39937" Jeez, I'm trying to decipher the website to figure out when to look.

examine the truth of the statement "the moon moves in a near-circular orbit around earth. because the Earth is so much more massive, it own motion is not appreciably affected by the moons presence" please help

examine the truth of the statement "the moon moves in a near-circular orbit around earth. because the Earth is so much more massive, it own motion is not appreciably affected by the moons presence" please help

I picked this up on another board and am mystified. I'd like some more input on it. What do you guys think? Note especially the naked eye confirmation and the multiple witnesses. A co-worker of mine, out on the weekend at a campsite, looked up at the moon and noticed a strange red...

During an ecclipse where the moon is between the Earth and the sun the moon experiences more gravitational force from the sun. How come the moon doesn't fall off into the sun?

Hi, Just a stupid doubt...when the moon is in FIRST QUARTER or LAST QUARTER, their angular separation is of 90 degrees; question: is it the TRUE angular separation or is it the difference of ecliptic longitudes? Kind regards, Kepler

Sorry if this is the wrong thread. For years there has been all of these rumors that the USA never really got to the moon and that it was alll a hokes just so that we could win in the space race. Is this true? Did we not have the capabilty to get to the moon? Or is this something made up...

Ok this is really funny. This is a really simple question and I used to know it but the more complicated things I learn, the more doubt I have on my foundation. So what is it that causes moon to change its shape?

I recently heard someone claim that not too very long ago Newtonian theory based on the size of the moon predicted gravity on the moons surface would be 1/4 that of earth. The actual observation was that it is 1/6 that of earth. The conclusion supposedly is the moon is made of material less...

I have this problem for my AP Physics class that discusses the moon circling around the Earth. I am given the mass of the moon, time it takes for one revolution, and the moon's distance from the Earth (the radius of rotation). I am supposed to find out the tangential speed of the Moon traveling...

if we were to tie a rope around the moon and have the end on earth. what would happen if we were to pull the moon? could we actually pull it closer until it eventually collides with earth?

This is my first posting so please feel free to move the topic to the appropriate section in case I posted it in the wrong section. With yet another problem announced with the space shuttle this morning I wonder if someone could explain why we almost 40 years after the supposed moon landing...

part 1 http://video.google.com/videoplay?docid=1913474363747128107 part 2 http://video.google.com/videoplay?docid=-5737681932896358451 part 3 http://video.google.com/videoplay?docid=-2265515730495966561 now, they produce huge amount of evidence that indeed moon landing happened in...

Hi everyone :) I'm new to the forums, need some help with a homework question I just can't seem to be able to get... The question as described in my book is as follows: The mass of the moon is 7.35x10^22 kg. At some point between Earth and the Moon, the force of Earth's gravitational...

70 \frac{km/s}{Mpc}*\left(384400\ km\right)=8.72028137*10^{-10}\frac{m}{s} 8.72028137*10^{-10}\frac{m}{s}*\frac{3.1556926*10^{7}\ s}{yr}=2.75185274\ \frac{cm}{yr} http://www.google.com/search?q=70+km%2Fs%2FMpc+*+384400+km+*+1+year http://www.google.com/search?q=1+year+%2F+1+second&btnG=Search...

Suppose you were kidnapped and held prisoner by space invaders in a completely isolated room, with nothing but a watch and a pair of shoes (including shoelaces of known length). Explain how you might determine whether this room is on Earth or on the moon.

http://www.cohenufo.org/unsolved.html#aldrinapollo11 See in particular the videos on page two. It is claimed that this case is not resolved. I was aware of the story but never saw the video or the specific claims made by Aldrin, which can be seen on the show cited: "First on the Moon: The...

I'd like to propose an experiment for finding water on the moon (see third point). First point, the evidence: Apollo astronauts commented that the crater Aristarchus is the most volcanic-looking region on the moon. If earth, Venus, and Mars have feature volcanic regions (Hawaii...

Simple, we take the project away from NASA and give it to the Air Force instead. According long established international law, an imperial power first plants it’s flag on a newly discovered land, thereby claiming it as sovereign territory belonging to the power that first explored it. The task...

So Hi, About the question of property. Can some one claim to own the moon or a certain area in space, and thus ask for rentals for anyone land on them or pass through them. What about 'countries' or 'United States' ownership? Can these 'things' be subject for sale ..etc? I am all ears!

Did anyone in the uk see the moon last night ? it was so bright, and seemed to have a three lobed halo surrounding it, is this just atmospherics ?

I learned that the distance betwee the Moon and the Earth is increasing but I couldn't find the reason for it, Is it because of the Earth's orbit? I mean that when the distance is minimum , causes the moon to move towards the sun ( Newtonian laws ) and even when the distance becomes maximum the...

NASA often uses the gravity of a planet to slingshot a probe on its way to a more distant planet. The interaction of the planet and the spacecraft is a collision in which the objects do not touch. How can the probe have its speed increased in this manner? This problem confuses me, I want...

I would like to calculate with high-accuracy the apparent geocentric positions of this three: Spica, the sun and moon. I will apply the following corrections for Spica: 1. proper motion 2. precession 3. rotation of ecliptic 4. stellar aberration 5. annual parallax 6. gravitational...

The Earth, Moon and Sun's "gravity" game. Hi all, I was thinking today that even though the moon is orbiting the Earth, because we are its nearest body mass, is it affected in any way by the Sun? In other words, to me it seems strange that just because the Moon is under the direct pull of...

Does anybody know if it is even possible for a planetary moon to have a moon of its own orbiting it?

I know this particular cons-theory has been done to death already, but does anyone on this forum have the means to examine the rate of fall of dust from the lunar rovers wheels as seen on NASA film footage? If the whole thing was filmed on Earth the one thing no one can fake is gravitational...

[PLAIN]www.vanderbilt.edu/cso/SSI2003-Williamson/lessons/sportsonmoon/lesson.doc[/URL] In my physical science class I am doing a project roughly like the one seen above. I have to apply physics concepts and formulas to design a sport on the moon. I was told in the future NASA will probably be...

Does the moon rotate around it`s axis? for images see please: http://omega.webzdarma.cz/applety/moon/moon.html The moon doesn`t rotate around it`s axis, I think. In many books the moon does rotate around it`s axis. I have never undrestood why. Let mi introduce my point of wiew. We feel...

What is the apparent weight of a 75-kg astronaut 4200 km from the center of the Earth's Moon in a space vehicle (a) moving at constant velocity, and (b) accelerating toward the Moon at 2.9 m/s^2? State the "direction" in each case. I understand part a. I got 21 Newtons towards the moon by...

Considering (again!) which way type of experiments (the interference type of set ups when a photon may go through two different routes and then one recombines the paths and checks for the presence of absence of interference (as used in quantum erasers, etc)). Usually, people say that if there...

I remember seeing old TV footage from 1961 of Kennedy promising to get to the moon before the end of the decade, which they succeeded in doing with Apollo 11 in July 1969. All the planning, designing, building and testing, the successes and failures, redesign, rebuild, retest, the development...

[SOLVED] Russkies are going to the moon! The head of Energia, Nikolay Sevastyanov, is planning to build a nuclear-powered moon base by 2015, so that they can extract lunar ^3He and send it back to earth. http://english.pravda.ru/science/19/94/379/16403_moon.html...

So had an idea the other day, and...Too make a gob of statements that started out incoherently seem coherent this is what I was thinking of doing: Take an asteroid (roughly 2 million pounds in weight) from the asteroid belt and place it in moon orbit. Please don't ask me about how I would...

A pendulum consists of a mass m = 0.070 kg hanging from a flexible string of length L. The string is very thin, very light, and doesn't stretch much. It makes small oscillations, with a period of 0.704 s. Find the oscillation frequency of the pendulum. Neglect any air resistance. I got this...