Moon Definition and 1000 Threads

Here is a problem, please let me know whether my answer is right or wrong. Locate the position of a spaceship on the Earth-Moon center line such that the tug of each celestial body exerts on it would cancel and the craft would literally be weightless. I found two equations: A...

11/23 10:41. the moon is shining through a circular opening in the clouds or something. seriously, the opening is a perfect circle. it is the weirdest thing!go look at it! what the heck?

Two different simple harmonic oscillators have the same natural frequency (f=2.80 Hz) when they are on the surface of the Earth. The first oscillator is a vertical spring and mass, the second is a pendulum. If both systems are moved to the surface of the moon (g=1.67 m/s2), what is the new...

A solar sail is orbitting the earth. It needs to get to the moon by increasing its orbit energy through solar propulsion. How many orbits will it need to make and how long will it this take? Considering it starts in a Geostationary Transfer Orbit and has an acceleration of 0.5 mm/sec2.

Ive sure everyones seen these in there life or at least has an idea what I am talking about. The problem is your on the moon and only have these 15 items to survive, and you are supposed to organize the list from 1-15 in order of importance. The items are... *Box of matches *Food concentrate...

The Rotation of the Moon Today’s astronomers explain the Moon’s rotation about its axis with one side visible to Earth. The theory states, the moon spins on its north-south axis in harmony with its orbital velocity around the Earth. This revolution or slow spin of the axis of the Moon...

problem: The mass of the Earth is 5.98E+24 kg and its radius is 6370 km. The radius of the moon is 1738 km. The acceleration due to gravity at the surface of the moon is 1.62 m/s2. What is the ratio of the average density of the moon to that of the earth? (no units) I am very confused as...

I could swear i have, although when i started thinking about it could happen i got confused. You can probably tell I'm a newbie as there must be some really simple explination to this problem. It might be a bit hard to explain without a diagram, but imagine a metaphorical one with the Sun on...

Man went to the moon with only Newton's equations? I am keenly interested in seeing these equations. Anyone recommend a book or resource that details this?

is the shadow on a crescent moon the earth, or is it the dark side of the moon. i was taught in science a while ago that its the dark side of the moon, and an eclipse of the Earth on the moon is something different and more rare. but what i don't get is, if we are seeing mostly the dark side...

Why can a rocket travel to the moon with it's engine off? i know that it's because space has no friction, air resistance so the rocket can travel when it's gained speed from traveling out of the atmosphere. but are there any other reasons to that?

I'm completely stumped on 2 questions I have, I'm not even sure which formula's to use, I've tried many... any help?? 1) Lunar gravity at the Moon's surface is only 1/6 as strong as what we experience on Earth. Since the diameter of the Moon is about 1/4 that of the Earth, the lunar mass is...

I have a problem that I've been working on FOREVER but can't figure out how to do. Lunar Gravity at the Moon's surface is only 1/6 as strong as what we experience on Earth. Since the diameter of the Moon is about 1/4 as large as the Earth's, the lunar mass is about : a) 3 X 10^-3 times the...

Hi, We always see the same side of the moon. I believe this is due to an equilibrium state that happens after a long term for a dumbell-shaped or ellipsoid object. Can someone confirm this? What about other planetry systems? Do other moons constantly look at their respective planets...

actually, i have 2 problems I'm having terrible problems with: #1: i throw a ball with an intial SPEED of 15m/s at an unknown angle. there's a 2metre high wall 25 metres in front of me. between which 2 angles should i aim the ball for it to fly above this wall? #2: i throw a ball at...

I read somewhere that the distance earth-moon increases. How close by was the moon in the beginning? And what I do not understand is why. It seems to me that due to tidal movement, energy is lost. Which would result in the moon slowing down, and thus getting closer to earth. Why is the reverse...

Yup, me again, with yet another question i can't seem to find an answer to. Why doesn't the eath have as many craters as its Moon or Venus? These questions seem like they would be so easy to answer, but I am still having trouble figuring them out.

I would appreciate any hints or help in solving the following two physics problems. At this point I am stuck after trying to solve the problems for a while. 1. Apollo astronauts hit a golf ball on the moon 180 meters and 30 meters on earth. Assume that the swing, launch angle, etc are the...

Which part of the moon did they land on? The one that is facing us or the backside? If they landed on the front site can it be seen from a telescope? Also, what kind of flag did they use? Is it just a regular cloth? If so then why gravity doesn't pull it down?

Once my friend told me that we never went on the moon, that it was all a hoagie. Is he lying or just stupid?

Does anyone know why Mercury and our Moon do not spin?

Is this calculus correct, or do the decimals points have to be converted ? Thanks so much , cause I'm stuck The gravitational constant is 6.673 * 10 to the -11th power. The radius of the moon is 1737400 meters. Its mass (which is independent of gravity) is 7.35 * 10 to the 22nd power kg...

http://facstaff.uww.edu/mccreadd/intro4.html Oculomotor micropsia/macropsia seems to be a truly fundamental angular size illusion. It shows up in many different kinds of visual spatial illusions (McCready, 1965, 1983, 1985, 1986, 1994a, 1994b, 1995). The present theory simply proposes that...

(6.67 x 10 ^-11 N m^2/kg^2) (7.36 x 10^22 kg) ___________________________________________ (1.74 x 10^6m) ^2 simplify: 6.67 x 7.36 ___________ x 10^-11=22-6(2) x Nm^2/kg^2 * kg 1.74 ^2 ____________ _____________...

I know the moon causes tides, but I am unsure why. I did a quick calculation and found that the sun has a greater gravitational effect on the Earth than the moon does. My question is, how come the sun does not affect tides despite the fact that the gravitational force is stronger than the moon?

Can some one explain to me how did the moon started rotating around the earth, especially, assuming that the moon's material has Earth's origin? In other words, if the moon was initially a peace of the Earth how come it has the eliptic trajectory as it does?

what do you people think? I don't think we ever did.

Was wondering how we managed to land on the moon back in 69 and now 35 years later we are just managing to orbit the Earth. Surely as we did it 35 years ago is it not a lot easier to do it again now given the advances in technology etc And what a great moment for our generation to witness...

If we decide to one day collonize Mars or the Moon, I think it is absolutely essential to build habitats or domes that rotate. That way, people inside these dwellings won't be floating about. But most important of all, they also won't be losing any bone mass either, especially if they exercise...

Hi, I am new to physicsforums.com I was just discussing with a friend that says that the real or technical name for the moon is Irene. I don't really know any about this ... can anyone help?

I was just wondering if anyone has ever studyed what a large moon like ours would do to mars? Maybe the tektonic strain could be enough to warm the core and start volcanic activity. Could Mars have once had a large moon that was lost, maybe the asteroid belt could once have been a large body...

I was asked the following question by a friend and don't know how to help him, or where to even start. I'll admit, I'm a lawyer and its been several years since I've taken a physics class. If anyone can help I'd appreciate it. There is an 8x8x8 room on the moon; in the room is a refrigerator...

Baseball and the moon essay... I really need info about baseball and the moon put together. I'm new and I also want to know a little about how many mods and admins there are and the general stuff. I have to do an essay for this summer math and recent technology's camp in Maryland and I really...

Hi, I have a serious problem. My friend thinks she can jump off the moon. I know it's really dumb, but my classmates and I just can't convince her. Say like she's a baby, cause she's a moron. We even drew diagrams and pictures. Please help.

QUESTION: the mass of the moon is 7.3x10^22 kg and its orbital speed about the Earth is 1024m/s. The distance between the centers of the Earth and moon is 3.844x10^24 m. a) what is the value of the centripetal force acting on the moon? b) the mass ofthe Earth is 5.98x10^24 kg and the...

I was just wondering. How come the gravitational field strength of the sun is much larger than the gravitational field strength of the moon at when you calculate both values at Earth's position?

Would life have started on Earth without the Moon being around ? Our planet is unique in that it has such a sizable moon with which it has interacted for aeons. Many people assume that the Moons' gravitational force is merely limited to effecting the ocean tides, but the tidal effect goes...

Why doesn't the Moon spin on its axis? If someone is going to answer this with "Why should it" then Why does the Earth (and many planets) spin on their axis? I'm sure someone told me the answer once, but I can't remember, and it's bugging me...

Evidently, Hubble is to be left to die. http://www.brucegarrett.com/brucelog_2004_1_1.htm#b22 Njorl

How has the near equality of the Sun's and Moon's apparent size (as seen from Earth) affected our planetary history (vs transient phenomena like eclipses)?

I saw this real cool show last night on the science channel about the formation of the moon where it talks about a Mars sized planet that was between the Earth and Mars. This planet crashed into Earth creating the moon. I was aware of this theory, but had not heard that the space rock that did...

In the picture of the Earth from the moon I have here: http://history.nasa.gov/alsj/a17/20117422.jpg If the Earth is the same distance away from the moon as the moon is from Earth (making it clear) and the Earth is so much bigger why is the Earth so small in the picture while the moon is...

How can there be dust on the moon if there is no weathering whatsoever? I'm going insane over it.

Anyone want to give a guy a helping hand? Just wondering if anyone understands how the physics of swimming would be different from swimming on the moon. My project is to adapt a sport (to help our spacemen of course) so that they can continue to work out while outside of our planet. I play...

From: http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34339 "The Moon is currently the focus of an international program of scientific investigation. Current missions underway or planned will lead to the future use of the Moon for science and commercial development, thereby...

I've mentioned this before, the problems that might arise if the moon were to leave our orbit. However, I never really grasped why it is moving away from us, if it is even really the case that it is moving away from us. Is it? If so, why? And what effects will it have on Earth, if it does...

how special and the general relativity explains the position of moon from the Earth reference system taking also into account the Heisenberg uncertaintity problem. when we look at the moon from the Earth what is the indeed position of it. what is the error.

Someone please help me how to do these problems below. Thanks a lot for your help. 1) On the surface of the moon the acceleration due to gravity is approximately 1/6 the sun at the surface of the earth, and on the surface of the sun it is approximately 29 times as great as at the surface of the...

This is an astronomy homework question that my classmates and I are having an awful time with. If the penumbra of the Earth’s shadow is 16,000 km across, and if the Moon moves 3400 km/hr with respect to the shadow, why does it take 6 hours instead of only 5 hours to get completely through the...

Testimony of Dr. David R. Criswell: Senate Hearing on "Lunar Exploration" "Testimony of Dr. David R. Criswell at Senate Commerce, Science, and Transportation Subcommittee on Science, Technology, and Space Hearings: "Lunar Exploration" Thursday, November 6, 2003, 2:30 PM – SR-253 "...