Spacecraft Definition and 222 Threads

Homework Statement A spacecraft of mass m0 is descending with velocity v0 to land on an alien plant where the value of g is 1/6 of g on the earth. In order to land safely (meaning the final velocity upon landing is zero), fuel has to be burnt at a constant rate dm/dt=-k, where k is a...

Calculate the force (in Newtons) of Earth's gravity on a spacecraft 12900 km ABOVE the Earth's surface if its mass is 1410 kg.Give 3 sig figs.Be careful with your units! Again, here I know force is mass times acceleration, so would it just be 1410 times 9.8? The thing that worries me is...

Homework Statement A spacecraft is in a circular orbit of radius 3.1 X 10^4 km around a 1.9 X 10^30 kg pulsar. The magnetic field of the pulsar at that radial distance is 1.4 X 10^2 T directed perpendicular to the velocity of the spacecraft . The spacecraft is 0.20 km long with a radius...

If we launch a satellite to a circular orbit around the Earth at height 357.1 km, to find the velocity needed at launch, do we just set the energies equal?: - \frac {\mu}{2\left(r_E + h\right)} = \frac {v_L^2}{2} - \frac {\mu}{r_E} and then solve for v_L? \mu = GM, where M is the mass of the...

I found this presentation on Fusion Propulsion here: http://fti.neep.wisc.edu/presentations/jfs_jannaf_1205.pdf" The Gas Dynamic Mirror seemed the most interesting and I got a lot of Google hits on it, but here are some guys working on actual proof of concept hardware...

Planck craft launched May 14 is now in position and is operating. ESA says it began taking scientific data yesterday June 14. Going around the sun, about 1 million miles or 1.5 million km farther out than the Earth is. http://www.rssd.esa.int/index.php?project=PLANCK&page=dev_news...

If you had a spaceship travleing at half the speed of light then shot a bulit at half the speed of light again, would the bulit appear to go the speed of light relative to an outside obverver? (All preposed in theory, of cource.)

Help Spring Avarage acceleration and Spring Constant in a Spacecraft ! Homework Statement In NASA’s current concept, the lander has 4 legs, each with a plate on the end that will set firmly on the surface. Each leg has a spring to act as a shock absorber and each shock will compress 30 cm...

Hi all, In fact I have several questions, especially in satellite,space research and spacecraft . mainly i target by my questions to get the knowledge in electronics,communication and physics.so,i want to have an open discussion for my benefit and so others. 1-I want to know some...

1.a.) A star is 450 light years from earth. i) what is the minimum time a spacecraft could make a return trip to this star? ii)How fast should the spacecraft travel to make the journey in 30 astranaught years? iii) What is the distance of eart to this star as measured by the astronauts on...

Momentum in a spacecraft , please help! Homework Statement John (90kg) and Julie (60kg) are in a spacecraft (50kg). They swap chairs, which are 4m apart, located equal distances from the Centre of Mass of the spacecraft . Questions: Why does the spacecraft NOT move after they take their...

I know there is an answer to this somewhere, so please forgive me for not being able to see it :) When people say that light will always be measured at a constant speed, no matter where you are, what do they mean? Say we are in a spaceship which is standing still. Inside the spaceship, we...

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 On a spacecraft , two engines are turned on for 684s at a moment when the velocity of the craft has x and y components of Vox=4370 m/s and Voy = 6280 m/s. When the engines are firing, the craft undergoes a displacement that has components of x= 4.11x10^6m and y =...

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...

The Ulysses spacecraft , launched in 1990 and now in a polar orbit around the sun at a distance of roughly 240 million miles, is http://www.astronomy.com/asy/default.aspx?c=a&id=7424"!(?) How does he know that? I'm going to give him a call this afternoon... Anyone notice an increase in...

I've been thinking about this for a while but never got around to asking this. This has two parts. First, I understand that time and matter are closely related and that time slows down when in proximity to more matter. So, time on the moon is faster than time on Earth and time on Jupiter is...

Could the anomalous acceleration of the voyager spacecraft towards the sun be explained by its surface becoming electrically charged by friction with dust particles and the interaction of the electric charges with the sun's magnetic field?

Homework Statement On July 4, 2005, the NASA spacecraft Deep Impact fired a projectile onto the surface of Comet Tempel 1. This comet is about 9.0 {\rm km} across. Observations of surface debris released by the impact showed that dust with a speed as low as 1.0 {\rm m/s} was able to escape...

Number 857 #2, February 28, 2008 by Phil Schewe More Spacecraft Velocity Anomalies A new look at the trajectories for various spacecraft as they fly past the Earth finds in each case a tiny amount of surplus velocity. For craft that pursue a path mostly symmetrical with respect to the...

Sending a spacecraft to mArs! Help! pLease! okay guys so you have to open this file to read the question accuretely.. i have done some calculations but not sure if they are correct. So just this as best as i can, fist i figure out my semi-minor axis = a by 150km +150 KM +230 km...

Ok, so this is a homework question so i assume i put it in this forum (i'm new to this). I have been going over this for the longest time and have no clue on how to solve it please help. The marduk spacecraft will be lifted to low orbit using a traditional chemical rocket Rei=5x10^5 m...

Homework Statement A spacecraft is initially in a circular orbit of the sun at the Earth's orbital radius. It uses a single brief rocket thrust parallel to it's velocity to put it in a new orbit with aphelion distance equal to the radius of Jupiter's orbit. What is the ratio of the...

Homework Statement The radius of the Earth is about 6.38E3 km. A 7.38E3 N spacecraft travels away from Earth. What is the weight of the spacecraft at the following disatnaces. a)6.38E3 km b)1.31E4 km Homework Equations F=GMeMship/r^2 The Attempt at a Solution but that...

Homework Statement An unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 52.0 km. To the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 27.0 m/s...

Here's a problem which I encountered a while ago: "There is an alien on the surface of a spherical planet. The alien can run at a top speed of u. An alien hunter is hunting the alien in his spaceship which can fly at a top speed of v. Once the hunter sees the alien, he fires, and the alien...

If you were traveling near the speed of light on a spacecraft moving away from the Earth how you would you observe events happening on the earth, at normal speed or in slow motion? I can't work this out because I know light is always gaining on you at C even if you are traveling close to the...

1. Homework Statement Calculate the force of gravity on a spacecraft 19200 km (3 Earth radii) above the Earth's surface if its mass is 1500 kg. 2. Homework Equations Fg=[(G)(M spacecraft )(Mearth)]/r^2=ma. 3. The Attempt at a Solution...

Homework Statement This is a 5-part problem. In June 1997 the NEAR spacecraft ("Near Earth Asteroid Rendezvous"; see http://near.jhuapl.edu/), on its way to photograph the asteroid Eros, passed within D=1200 km of asteroid Mathilde at a speed of 10 km/s relative to the asteroid...

Problem: How fast must a spacecraft travel relative to the Earth for each day on the Earth to correspond to 2 days on the earth? My solution: proper time = 1 day = 86400 seconds time on space craft= 2 days= 172800 seconds relavant equation: t=t(0)/(sqrt(1-v^2/c^2) I would plug in...

Hi don't know if I am in the right area but i have a random question about future spacecraft and the speed they travel. the rumor of ufo's are known the be a flat sphere shape, why don't the people who design the future jets try designing the shape a little bit like a ufo instead of make the...

isnt possible to make cost efficient spacecraft by putting multiple types of rockets on a ship which can then alternate rocket engine at different levels of the atmosphere and eventually escape into space?

Homework Statement A spacecraft of mass 1000 kg is in an elliptical orbit about the earth. At point A the spacecraft is at a distance of 1.2 x 10^7 meters form the center of the Earth and its velocity ( 7.1 x 10^3 m/s) is perpendicular to the line connecting the center of the Earth to the...

Naked singularity can actually move the spacecraft in past? A singularity is a place where the laws of physics break down. So if singularities can interact with the outside Universe, then anything is possible. For instance, it would be possible to send a spacecraft round such a naked...

Homework Statement A spacecraft with a proper length of 300m takes 0.75E-6s to pass an Earth observer. Calculate the speed of the spacecraft as measured by the Earth observer. The Attempt at a Solution I'm not sure how to get this, when you plug in those numbers you get 4E8m/s...

Homework Statement Hey guys, I'm helping my girlfriend who is in a 101 physics class...ha, I've taken enough engineering physics, and I guess I can't figure this one out. I'm thinking too much into it, and can't even understand the question(what its asking). Is there a pressure...

I have always wondered how passing into and out of a planet's gravitational field would result in a net gain in velocity. http://pluto.jhuapl.edu/mission/whereis_nh.php" is an example: the New Horizons Jupiter/Pluto probe using Jupiter to get 9000 km/hr speed increase. It seems to me that...

Homework Statement An enemy spaceship moves past the Earth with a speed of 0.8 c. The captain orders the spaceship weapons department to blast the Earth with pulsed laser photons every 10 seconds. For the observers on Earth who see the flashes, what is the time interval they measure...

Homework Statement Crewed spacecraft are equipped with heat shields for protection when they re-enter the Earth's atomsphere. Why is this necessary? Homework Equations none The Attempt at a Solution Because upon reentering, the speeds can get so high that the outside of the...

An unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 43.0 km (see Appendix F). To the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 20.0 m/s. If...

Hi. I'm looking for a pic of a spacecraft for personal use. (Likely fictional, but I"m not above PhotoChopping.) I've googled for it, but not much luck. Looking for something manned, interplanetary, early 21st century, post-Apollo. Kind of like this...

Spacecraft Voyager 2 (of mass m and speed v relative to the Sun) approaches the planet Jupiter (of mass M and speed V relative to the Sun) as shown in Fig. 10-60. The spacecraft rounds the planet and departs in the opposite direction. What is its speed, relative to the Sun, after this...

hey i just need a lil help with this question An alien spacecraft is flying overhead at a great distance as you stand in your backyard. Yyou see a bright signal light in the spaceship blink on for 190.0 ms. The commander of the spacecraft measures that the signal is on for 12.0 ms...

I assume this has been done, but I have not seen any papers on it. For example, with the Voyagers traveling at however-many-tens-of-thousands-of-mph with respect to us, we should be able to measure the slower tick of their internal clocks (e.g., slower signalling). Perhaps this hasn't been...

Identical spacecraft s A and B each of mass m are orbiting the Earth in different orbits...they both have the same perigee and at t=0 spacecraft A hits spacecraft B from behind before impact speed of A was V[a] and B was V and both a distance R from the centre of the earth After the...

A spacecraft (Lo = 80 m) travels past a space station at speed 0.7c. Its radio receiver is on the tip of its nose. The space station sends a radio signal the instant the tail of the spacecraft passes the space station. (a) What is the length of the spacecraft in the reference frame...

A spacecraft (with its cargo, a satellite) is circling the Earth at a constant speed and an altitude of 600km. The combined mass of the craft and the satellite is 1.20×10^5 kg (kilograms). At phi = 0, the captain ejects the 1.10×10^4 kg satellite out the back. The speed of the satellite...

Hello I can't solve this one, can anyone steer me in the right direction. A 7600-kg space probe is traveling through space at 120 m/s. Mission control determines that a change in course of 30.0° is necessary and instructs the probe to fire rockets perpendicular to its present direction of...

I'm building a spacecraft attitude control simulation and I'm looking for some references to help me build a realistic mathematical model. Could someone please help me? I'm testing an AI library I built and that is requiring a lot of research in itself. Thanks for your time! Jeff

http://www.physorg.com/news9786.html :smile: