Moon Definition and 1000 Threads

Reading this about the Origin of the Earth during Hadean Eon at http://www.palaeos.com/Hadean/Hadean.htm" And there is a statement :bugeye: I find this statement hard to believe, if so, I would envisioned that the molten Earth and the Moon would be more ellipsoid in shape instead of...

I have only taken my high school Physics course so excuse me if I don't understand some things right away. I looked at the two stickies and neither seemed to explain my question. I have been trying to understand why the moon's orbit's apogee moves around Earth over a period of time. The...

Homework Statement At what distance from the Earth will a spacecraft traveling directly from the Earth to the Moon experience zero net force because the Earth and Moon pull with equal and opposite forces? Homework Equations GM(earth)/(R-d)^2=GM(moon)/d^2 The Attempt at a Solution...

I asked this on another thread, but I think it might need a thread of its own. If this has already been covered, can you please insert the link to the appropriate thread? I am wondering about the effect the LCROSS and LRO missions had on the moon. I've searched, but the most I can find is...

Someone locked the original topic for no obvious reason, but I have to comment on this: Fortunately, today is 2010 and not 1960, and if there's one thing that we learned in all this time, it's how to make lots of launches relatively cheaply and safely. We could've launched about 2000 tons into...

I know this is impossible, but theoretically speaking what would happen if the moon was stopped, so that it stopped orbiting the Earth and "stood still"? Would it hit Earth or what impact would it have on earth?

I've been always wondering, if it was possible to visit the moon so many years ago, why is no one bothering today? My question is related directly with the fact we have a space station in orbit, so no need to use rockets. Everything needed to reach the moon is a small craft with just enough...

Why does the Moon keep the same face toward the Earth but the Earth not keep the same face toward the Sun?

I was reading about how Newton noticed the apple from the apple tree fall down to Earth due to the influence of the Earth's gravitational force. So why don't the moon fall down to earth? Why don't any of the man-made satellites just fall down to earth? Why are they able to stay in orbit...

On the full moon day the moon is closer to Earth so the gravitation of the moon make the gravitation of the Earth on us less strong. Is it true ? Thanks !

Hy, What is the energy that moon got on us? Thanks!

I have seen this topic discussed a bit on the web, but I don't see any clear answers. I takes a lot of energy to make the moon go in a curve, if you had to do it with rockets you would need a lot of fuel. Therefore it takes a lot of energy to make the moon go round the Earth for 4 billion...

ok just a couple of questions I have been thinking about.. this is not my area of expertise so help would be greatly appreciated Could anyone tell me how far away from Earth I would have to be before I could shoot a bullet from a gun that would hit the moon. Supposing the bullet could travel at...

Homework Statement What multiple of the energy needed to escape from Earth gives the energy needed to escape from (a) the Moon and (b) Jupiter? Use the Table (link below) if necessary http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c13/fig13-19.gif Homework Equations...

Hi all, I looked through the reference library post, but didn't see anything about this. Is there a website that contains the relative locations of the sun, earth, and moon over time? moon phases aside - I would actually like to know the exact locations of the Earth and moon (in say...

The Moon And The Earth, Acceleration ( Question Answered, Just need check ) :D The question we were given was.: Given the facts that (i) the acceleration due to gravity at the surface of the Earth is 9.80 m/s2, (ii) the Moon orbits the Earth every 27.32 days, and (iii) the radius of the...

much difference?

Homework Statement What is the ratio of the rotational kinetic energy of the Earth to the rotational kinetic energy of the Moon as they spin about their axes? The Attempt at a Solution Me = Mass of Earth (5.97 × 1024 kg) Re = Radius of Earth (6.37 × 106 m) Mm = Mass of Moon (7.35 ×...

Homework Statement A landing craft of mass 12,000 kg prepares itself for a Moon landing. When at a vertical distance 160m above the Moon’s surface it’s downwards velocity is 15 m/s. A retrorocket is fired to give the craft an upward thrust to slow its speed to zero as it meets the...

why planethunters and astrobiologists are concentrating on finding life on Earth like planet with an orbit around host star rather than on jupiterlike planets moon i was browsing through the essentials of complex life to evolve on a planet. i am sure you all pretty much know that. plate...

How would you go about solving the three body problem in the case of our sun, earth, and moon? The moon's gravitational effects are enough to rule out using the restricted three body problem solution, right? So if given a set of initial conditions, how would one find equations for the...

If you were on the moon looking at the earth, why can you not see light between the Earth and the sun? Same goes for heat. Why is the space between the sun and the Earth so cold. Does light and heat only exist once it interacts with something else? If light is a particle wouldn't the...

Homework Statement One likely theory for the origin of the Moon is that it was formed by the impact of a Mars-sized object on the young Earth. How fast would the object have to be going when it hit the Earth to vaporize enough rock to make the Moon? Homework Equations The Attempt...

Homework Statement An object is dropped from a distanse of 2*R(moon radius) from moon senter. How many seconds does it take until impact with moon, and in what speed will it hit? The distanse of the fall will be 1.74*10^6 m. The problem is the not so constant accleration.. ;) gravity...

Hello! I came across this website on my quest to find an answer to this physics problem. I read a topic that was a similar problem, but it didn't address my question in particular. So now I'm posting my problem specifically, and thank you in advance for any help! Homework Statement a. What is...

If the moon is expanding its orbit at a rate of one inch per year, that would mean that 65,000,000 years ago it would have been roughly 1,000 miles closer to the earth. Does anyone know of a study that considers how the moon proximety to the Earth at this time may have effected the environment...

I've come to understand that the moon has, beneath its surface, mass concentrations (masscons) that cause an orbiting craft to take a rather irregular orbit, and 'dip' when it passes over these areas. Do we know what these masscons are comprised of? If not, what are the most feasible...

As most of us know, President Obama intends to cut NASA's funding to such an extent that the Constellation project is going to be cancelled. What is implicated in this decision is the fact that it will leave the USA without any space vehicle of any kind to get into space. This means the...

Homework Statement During an Apollo lunar landing mission, the command module continued to orbit the Moon at an altitude of about 100km. How long did it take to go around the Moon once? Rm= 1.74x10^6 m Mm= 7.35x10^22 kg G= 6.67x10^-11 r= Rm + 100,000 m Homework Equations v=...

Homework Statement http://www.screencast.com/users/trinhn812/folders/Jing/media/e79a7b88-f71e-4790-a35c-7bc0c3e03ec8 Answer key is marked Homework Equations F=gMm/r^2 =ma=mv^2/R The Attempt at a Solution So does gMm/r^2 also measure centripetal acceleration?

Homework Statement at a moment of total eclipse the moon lies in a straight line from the Earth to the sun. If your normal weight is 600N how much is your weight decreased by the combined pull of the sun and moon? [b]2. Homework Equations Mass of sun - 2.0x10^30 kg distance from...

the mass of the moon is about 7.5*10^22 kg and its diameter is about 3.5*10^6 meters. calculate the weight of a 70 kg person on the moon. so we got F=G*m1*m2/d^2 G=6.67*10^-11N*m^2/kg^2 to find the mass we can use m1= F*d^2/m2*G (how did we manipulate the first formula to get this? no...

If you have not already done so, take a look at the moon tonight. It's the brightest full moon of 2010. Big whoop, it's the first one too. Remember, never look directly at the full moon without protection, especially if you are with your lover.

Obama aims to ax moon mission NASA's plans to return astronauts to the moon are dead. So are the rockets being designed to take them there — that is, if President Barack Obama gets his way. When the White House releases his budget proposal Monday, there will be no money for the...

Alright, so I have a few questions. a) Consider a moon of mass m orbiting a planet of mass M in an elliptical orbit. The equation for the radius of an elliptical orbit is r=a(1-e2) / (1+ecos\vartheta). Derive equations for the orbital radius of the moon when it closest to and farthest from the...

Homework Statement 1. Homework Statement The velocity of the Moon relative to the center of the Earth can be approximated by varrowbold(t) = v [−sin (ωt) xhatbold + cos (ωt) yhatbold], where v = 945 m/s and ω = 2.46 multiplied by 10−6 radians/s. (The time required for the Moon to complete...

Homework Statement The velocity of the Moon relative to the center of the Earth can be approximated by varrowbold(t) = v [−sin (ωt) xhatbold + cos (ωt) yhatbold], where v = 945 m/s and ω = 2.46 multiplied by 10−6 radians/s. (The time required for the Moon to complete one orbit is 29.5 days.)...

I read this notion in the media frequently, and before you write me off as a dimwit, I realize that on Earth today, the moon is a huge mediator regarding Earth's spinning and wobbling and it would totally suck if it decided to leave :) However, regarding the likelihood of life developing on...

Hi At night when you watch moon in cloudy weather you will see the diffraction of moon light around it in circle form and so the colorful circles . Please explaine me the physics of it. Thancks.

Hi At night when you watch moon in cloudy weather you will see the diffraction of moon light around it in circle form and so the colorful circles . Please explaine me the physics of it. Thancks.

I've had it with so much "gardener's wisdom" that claims that certain moon phases are propitious for growing certain crops. I see statements like: "The first quarter moon is the ideal time to plant blackberries." or the like. This must be a crock. What does a plant care about the moon? Does...

Just can't get my head around this one. If at 100Km high above Earth the orbital speed to maintain altitude is X, then what would the speed be for the same object around the moon? Since gravity of the moon is smaller then earth's? I assume the orbital speed would need to be less?

I assume wind is also a factor but would the gravitational pull of the moon be the main force behind the oceans tides? To be honest I have no idea what even causes the wind so go easy on me if that was a dumb question.

This month there are two full moons and the second one is called blue moon. Anyone know why this full moon is called so?

What are the properties constitute to have zero gravity in moon. Why Earth has gravitational force while moon does not have? I need a concrete scientific explanation.

I've heard that the moon is very slowly moving away from Earth. Will it eventually escape Earth's orbit?

Homework Statement (a) Determine the forces that the moon and the sun exert on a mass, m, of water on Earth. Your answer will be in terms of m with units of N. (Use data from table 8-1 in your textbook for this question. The mass of the moon is 7.3 x 10 ^22 kg, and it can be assumed to be 3.9...

Suppose I inflate a balloon on the moon and then let it go. What would happen? Would it: 1) slowly release air and fall to the ground of the moon or 2) release air faster and fly away faster than on earthMy answer: I reasoned that the key to this question is the pressure difference, for the...

Hi Forum, I am new and have just registered as I have a few quetions I was hoping you may know concerning our moon. At what distance must the moon be from Earth for it to no longer have any gravitational effect on the earth? What is the strength of the moons gravitational effect on...

Tides are created by the gravitational attraction of the sun and moon on Earth. Calculate the net force pulling on Earth during a)New Moon b)Full Moon c)First Quarter Moon. Mass of the Moon: 7.35 x 10^22 kg Mass of the Earth: 5.98 x 10^24 kg Mass of the Sun: 1.99 x 10^30 kg Distance from the...