atmospheric drag - Article Index

Encyclopedia - Falling: Encyclopedia - Falling
Falling is movement due to gravity. By analogy, falling has other uses not directly related to gravity. Falling - Sensation. A sensation...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia - Weightlessness
Weightlessness is the experience (by people and objects) during freefall, of having no apparent weight. This condition is also known as m...   » Read the article

Encyclopedia - Specific Orbital Energy: Encyclopedia Ii - Specific Orbital Energy - Equation Forms For Different Orbits
For an elliptical orbit specific orbital energy equation simplifies to: where: is the standard gravitational parameter is semi-majo...   » Read the article

Encyclopedia - Outer Space: Encyclopedia Ii - Outer Space - Space Does Not Equal Orbit
To perform an orbital spaceflight, a spacecraft must go higher and faster than for a sub-orbital spaceflight. A spacecraft has not made o...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - Mission Highlights
Shenzhou 6 - Launch. The astronauts arrived at the spacecraft about 2 hours and 45 minutes before the launch and the hatch closed 30 mi...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Solid Propellants
The earliest rockets were created hundreds of years ago by the Chinese, and were used primarily for fireworks displays and as weapons. Th...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia Ii - Weightlessness - Overview
What humans experience as weight is not actually the force due to gravity (even though that is the technical definition of weight). What ...   » Read the article

Encyclopedia - International Space Station: Encyclopedia Ii - International Space Station - Name
The name "International Space Station" (abbreviated MKS in Russian) represents a neutral compromise ending a disagreement about a proper ...   » Read the article

Encyclopedia - Orbital Stationkeeping: Encyclopedia Ii - Orbital Stationkeeping - Stationkeeping In Geo
Due to luni-solar perturbations and the ellipticity of the Earth equator, an object placed in a GEO without any stationkeeping would not ...   » Read the article

Encyclopedia - Free-fall: Encyclopedia Ii - Free-fall - People Surviving Free Fall
At least three airmen have survived free falls of around 20,000 ft (6,000 m) without a parachute in the Second World War; Lt. I.M. Chisov...   » Read the article

Encyclopedia - Gravity Drag: Encyclopedia Ii - Gravity Drag - Vector Considerations
It is important to note that acceleration is a vector quantity, and the direction of the acceleration has a large impact on the overall e...   » Read the article

Encyclopedia - Difference Between Sub-orbital And Orbital Spaceflights: Encyclopedia Ii - Difference Between Sub-orbital And Orbital Spaceflights - Difference In The Real World
That said, typical sub-orbital craft need go only just past the accepted edge of space at 100 km (62.5 miles) for the flight to be a spac...   » Read the article

Encyclopedia - Falling: Encyclopedia Ii - Falling - Classical Physics
Falling is descent under gravity. All objects have mass and in the presence of sufficiently massive objects such as planets or moons they...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - Tracking
There are 20 land-based tracking stations in the Chinese space telemetry network. These are supplemented by four Yuanwang-series tracking...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - Upgrades
The Chinese space officials have said that the Long March 2F rocket featured a "fire security system" on the escape tower. Speculation on...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - Experiments
It was announced in July 2005 that Shenzhou 6 would carry one experiment involving the sperm of pigs from Rongchang County, Chongqing.[25...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Hybrid Propellants
A hybrid rocket usually has a solid fuel and a liquid or gas oxidizer. The fluid oxidizer can make it possible to throttle and restart th...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Propellent Density
Although liquid hydrogen gives a high Isp, its low density is a significant disadvantage: hydrogen occupies about 7x more volume per kilo...   » Read the article

Encyclopedia - Falling: Encyclopedia Ii - Falling - Sensation
A sensation of falling occurs when the labyrinth or vestibular apparatus, a system of fluid-filled passages in the inner ear, detects mot...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Mixture Ratio
The theoretical exhaust velocity of a given propellant chemistry is a function of the energy released per unit of propellant mass (specif...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Liquid Propellants
Main article: Liquid rocket propellants Liquid fueled rockets have better specific impulse than solid rockets and are capable of being th...   » Read the article

Encyclopedia - Rocket Fuel: Encyclopedia Ii - Rocket Fuel - Overview
Rockets create thrust by expelling mass backwards in a high speed jet. Chemical rockets, the subject of this article, create thrust by re...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - International Reaction
Shenzhou 6 - Parties within Greater China area. The Central Government of the People's Republic of China - Premier Wen Jiabao reitera...   » Read the article

Encyclopedia - Specific Orbital Energy: Encyclopedia Ii - Specific Orbital Energy - Additional Energy
If the central body has radius R, then the additional energy of an elliptic orbit compared to being stationary at the surface is For th...   » Read the article

Encyclopedia - International Space Station: Encyclopedia Ii - International Space Station - Building The Iss
Building the ISS requires more than 50 assembly and utilization flights. Of these flights, 39 are planned to be Space Shuttle flights. In...   » Read the article

Encyclopedia - International Space Station: Encyclopedia Ii - International Space Station - Criticism Of The Iss
There are many critics of NASA who view the project as a waste of time and money, inhibiting progress on more useful projects: for instan...   » Read the article

Encyclopedia - International Space Station: Encyclopedia Ii - International Space Station - History
Initially planned as a NASA "Space Station Freedom" and promoted by President Reagan, it was found to be too expensive. After the end of ...   » Read the article

Encyclopedia - Difference Between Sub-orbital And Orbital Spaceflights: Encyclopedia Ii - Difference Between Sub-orbital And Orbital Spaceflights - Energy Calculations
Lifting a craft to 100 km altitude requires pushing against the force of gravity over that distance. For the sake of calculation, we'll a...   » Read the article

Encyclopedia - Difference Between Sub-orbital And Orbital Spaceflights: Encyclopedia Ii - Difference Between Sub-orbital And Orbital Spaceflights - Angular Velocity
An orbital spaceflight is achieved when the spacecraft travels around the Earth in space at sufficient lateral velocity (or equivalently,...   » Read the article

Encyclopedia - International Space Station: Encyclopedia Ii - International Space Station - Present Status Of The Iss
After the breakup of Columbia on February 1, 2003, and the subsequent two and a half year suspension of the US Space program, followed by...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia Ii - Weightlessness - Microgravity
The term microgravity is also used because weightlessness in e.g. a spaceship or other container is not perfect. Causes include: Gravity...   » Read the article

Encyclopedia - Specific Orbital Energy: Encyclopedia Ii - Specific Orbital Energy - Rate Of Change
For an elliptical orbit the rate of change of the specific orbital energy with respect to a change in the semi-major axis is: where: ...   » Read the article

Encyclopedia - Specific Orbital Energy: Encyclopedia Ii - Specific Orbital Energy - Examples
The International Space Station has an orbital period of 91.74 minutes, hence the semi-major axis is 6738 km [1]. The energy is −29.6 M...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia Ii - Weightlessness - Health Effects
Following the establishment of orbiting stations that can be inhabited for long durations by humans, exposure to microgravity has been de...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia Ii - Weightlessness - Weightlessness In A Spaceship
Weightlessness for a more extended period of time occurs in a spaceship outside the earth's atmosphere, as long as no propulsion is appli...   » Read the article

Encyclopedia - Weightlessness: Encyclopedia Ii - Weightlessness - Nasa's Zero-g Research Facility
NASA's Zero-G Research Facility, located at the Glenn Research Center in Cleveland, Ohio, is a 145-meter vertical shaft, largely below th...   » Read the article

Encyclopedia - Shenzhou 6: Encyclopedia Ii - Shenzhou 6 - Crew
Shenzhou 6 - Backup crew. Team 1: Liu Boming, Jing Haipeng Team 2: Zhai Zhigang, Wu Jie This is the first spaceflight for both astron...   » Read the article