Moon Definition and 1000 Threads

I have some confusion understanding some concepts of Earth moon system . Why conservation of momentum requires both the Earth and the Moon to revolve around the centre of mass ? What happens if they do not revolve around the centre of mass ? Plz clarify and guide me .

Why haven't we gone back to the moon? Seems like we could save a whole lot of money and time if we were to go back and explore the moon rather than going to mars. A lot of the questions posted here could be answered if we had gone back. Why aren't you asking this question yourself?

Or is Earth the only world in the inner solar system with caves.

This is last nights chart (from about 10PM to sunrise) into about a 3K load from about 500W total of panels. The hump at about 800 samples is where a separate panel of 120W started getting light from the moon. Maybe 20uW at max power. :biggrin: The DAQ is a Linux based NI-DAQCard-700 12-bit...

I have seen some documanters,and I have talk with some people about this issue: "Did human go to Moon ?". Many people supports that never we went to Moon,and they have some logic arguments. Other people support,that something so big...can not be fake,so we went to Moon for sure. What you...

Dear Friends! I am curious to know about take off from moon of a space craft. How Apollo landing module after detaching itself from orbitter module lands on moon and how later it takes off to attach to orbitter module in the absance of any atmosphere which could give continuous support to...

The hammer is at 200km and the sickle is at 100km above the Moon. As they fall down, the distance between them increases, or not? We need 'jolt' formula here, the rate of change of acceleration, right?

Homework Statement As part of a NASA experiment, golfer Tiger Woods drives a golf ball on the moon, where g = 1.60 m/s2. He ‘launches’ a golf ball with a speed of 285 km/h, at an angle of 42o with the horizontal. What horizontal distance will his drive travel before landing back on the...

Tonight; July 5th, 9 pm central time. I just happened to look up and catch a gorgeous view (perfectly clear) of the quarter moon with a tiny "star" just barely visible above the terminator about 1/4 moon diameter, grabbed my binoculars, then googled it, and realized it was Mars sitting about...

Can a push, be faster than light? If I was to hold a stick that stretched out to the moon, and pushed it. Could I push the moon instantly? Seeing as that the stick could defy physics etc and I had enough strength to make an impact on the moon.

Homework Statement The moon circles the Earth with a period of 27.3 days at a distance of about 250000 mi. Find the centripetal acceleration of the moon.Homework Equations ac = v2/r The Attempt at a Solution I first found the velocity by converting 2 pi radians per 27.3 days to radians per...

BBC news today have an article Traces of another world found on the Moon It says Can someone please help me understand. If the sun and our planets formed from the same dust cloud, then why are the isotopic ratios different?

Homework Statement Alright, this is probably going to be a long one. For a school project I am trying to simulate (in 2D) our moon's orbit around the earth, to eventually simulate a spaceship doing a hohmann transfer between LEO and LLO whilst being affected by both the Earth's gravity and...

Homework Statement We have given coordinates on the Earth from where we are shooting to the Moon (bullet has really small mass). The Moon orbit and therefore Moon position in time t is known. The task is to compute the initial velocity vector (the angle and velocity of the bullet), so the...

Hey guys, we just had a physics test and one exercise was the following: The Earth pulls down on stuff with 9.81 N/kg. How strong is this force on the moon? Homework Statement Radius of the Earth re = 6,370km Ratio between re and rm = 11:3 Ratio between me and mm = 81:1Homework Equations...

I hope I posted this in the right section. Here are two questions I have. 1) If I pull on a very heavy object, that object's mass resists my attempt to accelerate it. This is known as inertia. When that object resists my attempt to accelerate it, it essentially pulls back on me with an equal...

Homework Statement Nothing travels faster than light, which manages to get to the moon from the Earth in 1 second. However, we can still get there in a shorter amount of time. How fast would we have to travel to reach the moon in 0.9 seconds? Homework Equations I know the question is weird but...

Hello. My name is Andrew Huerta and I am a comic creator. I am currently doing some research for a comic I'm working on and I'm having a bit of trouble grasping some of the concepts I've created. Basically, what would be the reality of this situation? Like, what would that scenario do...

Cassini has recently witnessed a bright bump at the edge of Saturn's rings, indicating the formation of a probable moon. If confirmed, the informally recognised Peggy will stand the 63rd moon of the gas giant. Scientists say that this might be one of the last moon formation...

Homework Statement The mass of the Earth is Me and the mass of the Moon is Mm. The (center to center) Earth to moon distance is d. a) If a space probe is sent directly from the Earth to the moon, how far from the center of the Earth would the net gravitational force (due to the Earth and...

http://www.space.com/25487-total-lunar-eclipse-blood-moon-brightness.html

Hi Im trying to calculate the speed of the moon at perigee but i don't know where I am going wrong. As i know the formula is v = sqrt[ GM( (2/p) - (1/a) ) ] where g = gravitation constant m = mass of the earth p = distance perigee from the earth a = semi major axis The values I am using are...

This article mentions moon dust as "subjected to a millenia of UV radiation" as if it's a bad thing. UV would simply irradiate the dust, not make it more hazardous correct? Perhaps they meant "a millenia of cosmic radiation" which would be much more problematic, no? If this line of...

Shooting a .45 caliber hand gun on the moon "launches" you a mile? My co-worker and I were having a discussion about an activity that he did while at a teachers math conference. The activities was to rate the importance of objects. There were 15 objects and you are stranded on the moon 200...

Hello, I was wondering that I'm a astronaut on Moon and I thought about a one question... If I look at the Earth (in "full moon") from the Moon, what magnitude will have the Earth? Ok, I know some typical values that the magnitude of Moon from Earth is -13 mag and the magnitude of Sun from...

Many of you don't know this, but as a young man, Greg once decided to worship the moon. He was so obsessed by the moon that he once decided to start following it. So at any given moment, he would check where the moon is and then walk in that direction. Greg has special powers so that he can see...

Look for help on these equations. Any help will be greatly appreciated. Thanks so much! :) The Apollo spacecraft must be traveling at what velocity in order to remain in a 110 kilometer orbit around the moon? The magnitude of the Apollo’s orbital velocity can be computed from the laws of...

Homework Statement You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the Earth with enough speed to make it to the moon. On your first attempt you leave the surface of the Earth at v = 5534 m/s. How far from the center...

I attatch a rope of a constant density to the Moon and fasten it down to the surface. I set the other end in space right above Earth's atmosphere. The angular speed of the entire rope is brought up to the same angular speed as the Moon at time=0. http://i.imgur.com/kHlVvnM.png What would...

Homework Statement The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force vector F SM that the sun exerts on the moon is perpendicular to the force vector F EM that the Earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of...

"Static" moon question for a book Hi there, I was wondering if some scenario (about the moon) was possible for the book I'm writing (heroic fantasy) : - my planet is a standard one, potentially bigger than earth - I'd like my moon to be always between my planet and the sun, so whenever...

Homework Statement Would the horizontal distance traveled by a projectile on Earth be the same as one on the moon? I feel like the distances would be different, but when I was calculating the initial velocity of the projectile on the moon I used the same x value(distance) that I did for...

I'm looking at a textbook problem which has an answer but no working out. I've read the chapter several times and looked at the equations but can't see where to start with it? Can you help? Assuming the Earth and Moon to be isolated from all other masses, use the following data to estimate the...

Homework Statement At a certain instant, the earth, the moon, and a stationary 1030kg spacecraft lie at the vertices of an equilateral triangle whose sides are 3.84×10^5km in length. Find the magnitude of the net gravitational force exerted on the spacecraft by the Earth and moon.Homework...

Homework Statement A stone is thrown with an initial velocity 5m/s such that it covers maximum possible horizontal distance RE on the surface of the Earth. The same stone is thrown with same initial velocity by a person standing on the moon, making an angle of 150 with the surface. given that...

Homework Statement Hello, I need somebody to double check and confirm my answer. I have absolutely no idea what the solution manual is doing. Moon effect. Some people believe that the Moon controls their activities. If the Moon moves from being directly on the opposite side of Earth...

Lets say there is a gas giant similar to Jupiter orbiting a yellow star similar to our Sun. The planet and moon orbit at a distance that would resemble in between Mars and Earth. So the moon would receive 70% the sunlight that Earth receives. Around this planet exists a moon with 0.064 Earth...

suppose that you went to moon.You have nothing else with you except a discharged battery.now if I have to recharge it how'd I do it? Only equipment permitted is a small copper wire. Tanks

Homework Statement If you can hit a golf ball 180m on Earth, how far can you hit it on the Moon?The Attempt at a Solution Since this question deals with range; sx = [vxi^2 sinΘ]/g My problem is that I do not have the velocity at which the golf ball is being hit. As for the launch angle, I...

With a small budget would it be possible to make a rocket capable of delivering a small probe to the moon? A rocket that puts the probe into Earth orbit and them Hoffman transfer to the moon and guides itself to the surface? I am talking very small, maybe the size of a baseball, that...

Homework Statement On June 22, 1978, James Christy made the first observation of a moon orbiting Pluto. Until then, the mass of Pluto was not known, but with the discover of its moon, Charon, its mass could be calculated with some accuracy. Explain. 2. The attempt at a solution "By...

What if the moon disappeared?? Homework Statement I am doing a project answering this question: what if the moon disappeared? I was looking up how the moon was affecting Earth's rotation around its axis and noticed how the moon pulls Earth backward, slowing down Earth's rotation. One of the...

When Earth is between sun and moon,we have full moon. But I can not really understand that. How light of sun reach at moon? Does not hit in earth? Or maybe light follow a curve as general theory says? Thank you!

Hello readers, My name is Mungo and i am making a television series about conspiracies, which is to be narrated by Tom Baker (The 4th Doctor... which actually depends on if you count Peter Cushing from his 1965 Daleks film, which many people do not do, despite the fact that they have no...

From Earth with the naked eye, the Moon is pretty small. If a nuclear weapon were detonated on the Moon, would it be visible from Earth? Would it make a difference if the device were detonated during local daytime (in full sunlight) as far as visibility is concerned? If it makes a...

I'm doing a research paper based on mining asteroids or near Earth objects. I was wondering, could we pull/move a relatively large asteroid About half as large as the moon could we use is as an anchor to launch missions? Thanks!

We know Moon creates tides on seas.Then why doesn't Moon pull loose stones or other objects lying loose on earth?

Venus Jupiter and Moon Conjunction HD Timelapse Huge Full Moon Rise - Realtime 2600mm 720p http://www.youtube.com/watch?annotation_id=annotation_177268&feature=iv&src_vid=ZiYhzJ8jiAg&v=n_wt0M8vm0c MOON ZOOM 1600x digital zoom Ive been quite impressed with the latest digital...

Homework Statement Consider the Earth's radius to be 6.40x103km, its mass to be 6.00x1024kg, the Moon's mass to be 7.36x1022kg, and the Moon's radius to be 1.74x103km. The average value for the Earth-Moon distance is 3.84x105kg. Neglect friction and rotation. a. Sketch the potential...

Homework Statement Saturn’s moon Titan is the only moon in the solar system with an atmosphere, which is 95% nitrogen molecules (N2), similar to Earth’s atmosphere. At Saturn’s distance from the Sun, the temperature of the atmosphere is only 95 K (−180◦ C), and the molecules have an average...