Moon Definition and 1000 Threads

In Gulliver's Travels Jonathan Swift described the two moons of Mars, Phobos and Deimos, giving their exact size and speeds of rotation. He did this more than 100 years before either moon was discovered. granted this is true - how would one even predict such a thing?

"The ball weights about one sixth as much on the moon, and lifting the ball on the moon requires one sixth of the force. However, because the mass of the ball is the same on the moon as on the earth, throwing the ball horizontally at a specified speed requires the same force on the moon as on...

Hello, Funny request here. I'm trying figure out a way to mount a series of mirrors to make the moon look bigger or give the illusion that it is bigger. I have no clue how to go about this, I'd appreciate your ideas and thoughts on this. Thanks p.s: This is without using a computer. I'd like...

[b]1. Homework Statement Calculate the time the moon rotates once around the earth, and show that you have to add 4 hours to that since the moon & the Earth rotate around their center of mass. hint: use the reduced mass: \overline{m}=\frac{m_{1}m_{2}}{m_{1}+m_{2}} mass of moon...

why is there no atmosphere on moon

Hi please help med to calculate the descent and ascent velocity for a object in moon How to calculate the required thrust to land a object mass 100 kg on moon? How to calculate the required thrust to escape a Object mass 100 kg from moon?

http://www.space.com/entertainment/090515-apollo-snoopy.html 40 years! OMG! It is hard to believe that what was once the cutting edge of technology is now all but ancient history.

Hi, We have an assignment in my physics class and I am not sure where to start. We are suppose to duplicate Galileo's experiment, using the concept of similar triangles to calculate the height of the object. 1. What is the height of the three objects on the moon in miles? 2. What are the names...

Homework Statement At a point between the Earth and moon, the magnitude of the Earth's gravitational acceleration equals the magnitude of the moons gravitational acceleration. What is the distance of that point from the center of the earth? The distance from the center of the Earth to the...

Hello why is moon getting away from Earth about 2-3 centimeter/year ?

Homework Statement The Moon has a mass of M= 7.0E22 kg and a radius of R=1.75E6 m. A projectile with mass m=10 kg is shot straight up from the Moon’s surface with an initial speed of 500 m/s. What is the maximum distance from the center of the Moon that this projectile can reach? Homework...

We know that free fall acceleration is independent of mass. 9.8 m/s^2 on the Earth Surface and 1.63 m/s^2 on the Surface of the Moon. But what would happen if you dropped the Moon on the Earth or, the other way around, dropped the Earth on the Moon? Which acceleration would it be? Is...

I know from reading that the Moon slows down the Earth's rotation by creating friction on the ocean floor by causing the tibes, and as a result of this the Moon gains energy and moves farther out into space. What I don't understand is though, is that when the Earth slows down how does it...

Hello, newbie here! My basic question is simply this: what is the formula/calculation required to derive the angle of the Moon's terminator with respect to the *horizon*? Obviously, it will point to the Sun in some way -- but I want to know its orientation in az/alt terms -- not with respect...

Why is the idea of putting a station in orbit more appealing then putting on on the moon? I understand the want to test things in low gravity. But what about cost wise? I know that the ISS has to change it's direction every now and then to avoid random junk floating in space, and I understand...

First off, I'd like to apologize if this topic is against the rules. It's not a homework question, it's just something I decided to do in my spare time, so I figured it's okay to post here, but please tell me if not and I won't do it again. Being a young physicist (14) I don't have much...

I was wondering, if the moon losses its mass at a constant rate and the Earth gains mass at this constant rate (so the sum of there masses is equal), the force between them would stay the same would it not? F = GMm/d² What happens to the moon? Does the moon move away, stay the same or come...

So if I'm on the moon is there a delay with the communication to earth? What is the speed of sound over satellites verses copper wires? Anyone know?, this has been on my mind. thanks

Hey guys, I got the following problem. It seems east, btu I still have no idea how to get started on this one:frown:

Homework Statement The mass of the Moon is 7.36 x 10 ^ 22 kg. At some point between Earth and the Moon, the force of Earth's gravitational attraction on an object is canceled by the Moon's force of gravitational attraction. If the distance between Earth and the Moon (center to center) is 3.84...

Homework Statement The moon has a mass M = 7.36e+022 kg and an average radius R = 1740 km. for part a)I solved for the gravitational acceleration on the surface of the moon= 1.62 m/s^2 An object on Earth weighs 64 N. b) What is the weight of this same object on the moon? Answer...

Hi everybody, I apologize if this has been asked already - I searched for a similar topic to no avail. My question regards something touched upon briefly in Olaf Stapledon's book Star Maker. Stapledon writes of interstellar travel being acheived by detaching a planet from a solar system and...

Especially one so little. (this is False Colour. Really this is a sooty black body, with redbrown ooze at the bottom of the craters, and a water ice white frosting on the peaks of some of the high ridgetops) Most of the craters seem just like a bed of hydrothermal vents in a high energy...

I've been reading and reading and trying to figure this out, but I just can't. Any help anyone can give will be appreciated. It is probably simple as hell, but for some reason my stupid brain can't get it.. The formula/equation is: What I have to do is: Now, I'm not looking for...

question(s): These are questions from an exam i took earlier tonight, but do not know if i got them correct. 1) Rain is falling with velocity 30 m/s at an angle of 60° from the vertical and is blowing due east. If a passenger inside of a train (also traveling due east) observes the rain...

Moon --> Earth (Gravitational Pull... help please any comment welcome! Homework Statement At what distance (AU) does a spacecraft leaving the gravity of the Earth traveling toward the moon balance the gravity of the moon? I.E. What distance in (AU) will the object begin being affected by...

Hi, I am just wandering based on the formula.. F = GMm/r^2 Is the gravitational force exerted by the Earth on the moon is the same as the gravitational force exerted by the moon on Earth ? It should be the same right? Both lies on a same radius.. Can someone clarify this...

Homework Statement Supppose that electrical attraction, rather than gravity were responsible for holding the moon in orbit around the earth. If equal and opposite charges Q were placed on the Earth and the Moon, What should be the value of Q to maintain the present orbit? Treat the Earth...

anyone know how scientists measure the rotation period of the moon? thank you!

Will a sand-filled hourglass flow faster, slower, or the same on the moon as it does here on earth?

There is currently a number of proposals for the evolution or origin of the Moon. It has an unusually high inclination to the Earth's equatorial plane and a low inclination to the ecliptic, which has prompted varied speculation. (See Wikipedia Moon). I was particularly interested in the...

it's supposed to be cloudy here. :frown: http://news.yahoo.com/s/space/20090109/sc_space/saturdaynightspecialbiggestfullmoonof2009

Hi PF, What are the major difficulties the man faces when he tries to reach the Moon? Is it because he has to return to Earth, so that the difficulties are more than doubled? Because the distance between the Earth and the Moon is not that big compared to Earth's equator circumference (less...

How big would an asteroid/comet have to be to impact the moon enough to have a significant effect on the Earth's ecosystem? Dust, tidal forces, etc. Thanks, -Mike

Homework Statement So in my high school physics class we are asked to write a paper about devoping a sport on the moon. I choose to do frisbee on the moon. We are asked to use 3 physics principles for the sport and describe how each princible applies to my sport in detail. also describe how...

Homework Statement why moon has no atmosphere? Homework Equations The Attempt at a Solution

someone told me that it is impossible for a human being to survive in a spacecraft while traveling to the moon due to intense radiation somewhere in space that they would have to cross. is this true or just a hoax? I am not starting a conspiracy i just want a specific scientific answer on the...

Homework Statement Before landing men on the moon, Apollo 11 space vehicle was put into orbit about the moon. The mass of the vehicle was 9979kg and the period of the orbit was 119 min. The maximum and minimum distances from the center of the moon were 1861 km and 1838km . Assuming the moon...

Suppose that, on Earth, a mass is suspended on a vertical string and is executing an harmonic motion with Period: T Amplitude: A Angular frequency: \omega Now all the system is put in the Moon. What changes that system will have? Thanks for you help

Thanks Naveen

The Earth moon distance = 3.8 * 10^8 meters Time for light to reach moon = 1.266 sec. A laser at the origin on Earth pointed at moon rotates .001 radian with angular speed w = 10 radians/sec. The arc length distance described on moon ,s= (radians) (radius) =3.8*10^5 meters The velocity of...

Let say a weighing machine is brought to the Moon. If an astronaut weighs 70 kg on Earth, will the machine shows 70 kg on Moon? By right it should because mass is always constant? But I am not sure. Just like if a man is 60 kg at the Equator, will the same weighing machine...

did anyone else happen to notice it as well? I believe is was on the night of the 13th. It got more and more Intense as the night went on. Beautiful none the less! Anyone know why it happened? I used to remember the reason I thing but now I can't recall it. Oh. And I was in the central nj area.

A long time ago, I wrote a program that takes bunches of particles and applies Newtonian gravity to each so they interact. Lately I've rewritten this program, in an effort to simulate planetary motion. However I've ran into a bit of a snag, I can get a Sun-Earth system to behave properly, and I...

The moon moves away from the Earth 3,8 cm per year. In the past the velocity has been gradually increased. I have read at the internet, that when the theory explaining this cause of this phenomena is correct the moon would for about 85 million years been orbiting 4 meters above the earth...

[b]1. In tests on Earth a lunar surface exploration vehicle (mass = 5.68 × 103 kg) achieves a forward acceleration of 0.220 m/s2. To achieve this same acceleration on the moon, the vehicle's engines must produce a drive force of 1.42 × 103 N. What is the magnitude of the frictional force that...

1. During an Apollo lunar landing mission, the command module continued to orbit the Moon at an altitude of 100km. How long did it take to go around the Moon once? 2. T= 2(pi)(r^3/2) / root (GM) mass of moon = 7.35 X 10^22 radius of moon= 1.74 X 10^6 3. I think that is the...

Homework Statement On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a 6 iron. The acceleration due to gravity on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 18 m/s at an angle 45 degrees above the horizontal. a) How much...

I know that the moon orbits the Earth in a plane that inclines about 5 degrees with the Earth orbting plane (around the sun). My question is does the moon orbiting plane wobble or it hold still? If it wobbles, what is the period?

Homework Statement On the surface of the moon, an astronaut jumps with a speed of 1.0 m/s at an angle of 30 degres above the horizon. A max height of .78 m is reached. a- What is the acceleration of gravity on the moon? b- Determine the horizontal range. c- How much time did this...