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Originally posted by Tom Bedlam
Originally posted by mikesingh
Mach number is the ratio of the speed of an aircraft to the speed of sound at SEA LEVEL, at a temperature of 21 °C (70 °F) and under normal atmospheric conditions, which is 760 miles per hour.
Mach number isn't normalized. It's the ratio of the speed of an object to the speed of sound in the surrounding medium, not to STP. It varies with altitude, temp and gas composition.
The Mach number depends on the speed of sound in the gas and the speed of sound depends on the type of gas AND the temperature of the gas. The speed of sound varies from planet to planet.
www.grc.nasa.gov...
Originally posted by infiltr8u
reply to post by nightmare_david
your post about the super men experiments reminded me of the movie universal soldier, maybe that is where they got the idea for the movie?
Originally posted by erwalker
There are a number of things that amaze me about this thread including:
When some posters attempt to explain certain simple physics concepts to the OP, who obviously has no technical background and asks nonsensical questions, other posters seem to feel that the the thread is somehow being hijacked or the OP is being attacked.
The leaps in logic being demonstrated in this thread, such as reading technical papers discussing the requirements for and difficulties to be overcome in order to set up a base on the moon and concluding that the U.S. military has bases on the moon.
That a paper presented to the Safety and Flight Equipment Symposium by two Swedes who work for SAAB, the company that builds the JAS 39 Gripen, and found on STINET somehow means that the U.S. is helping to fund the development of the fighter. For anyone who says "But GM owns Saab!", GM owns Saab Automobile and not SAAB-Scania the aircraft manufacturer.
There are more things but I suspect if I write them, it will come off as an outright personal attack.
By the way, did you realize that a person with a pacemaker could be classified as a cyborg by strict definition.
As part of a project for the Defense Advanced Research Projects Agency, Sandia National Laboratories is developing and testing the feasibility of using of a cooperative team of robotic sentry vehicles to guard a perimeter and to perform surround and diversion tasks. This paper describes on-going activities in the development of these robotic sentry vehicles. To date, we have developed a robotic perimeter detection system which consists of eight ''Roving All Terrain Lunar Explorer Rover'' (RATLER?trademark!) vehicles, a laptop-based base-station, and several Miniature Intrusion Detection Sensors (MIDS). A radio frequency receiver on each of the RATLER vehicles alerts the sentry vehicles of alarms from the hidden MIDS. When an alarm is received, each vehicle decides whether it should investigate the alarm based on the proximity of itself and the other vehicles to the alarm. As one vehicle attends an alarm, the other vehicles adjust their position around the perimeter to better prepare for another alarm. We have also demonstrated the ability to drive multiple vehicles in formation via tele-operation or by waypoint GPS navigation. This is currently being extended to include mission planning capabilities. At the base-station, the operator can draw on an aerial map the goal regions to be surrounded and the repulsive regions to be avoided. A potential field path planner automatically generates a path from the vehicles' current position to the goal regions while avoiding the repulsive regions and the other vehicles. This path is previewed to the operator before the regions are downloaded to the vehicles. The same potential field path planner resides on the vehicle, except additional repulsive forces from on-board proximity sensors guide the vehicle away from unplanned obstacles.(Author)
Pluto remains the last outer planet as yet unsurveyed by any passing spacecraft. The spacecraft, Pluto Kuiper Express, is part of an approach by NASA to build, smaller, better, cheaper satellites for future space exploration. NASA's Jet Propulsion Laboratory is designing a mission that will conduct reconnaissance of the Pluto/Charon system, determining their composition, atmosphere, and geological characteristics. If successful, the spacecraft will be sent to observe objects in the Kuiper Belt, laying just beyond the boundary of the solar system. To reach Pluto in a reasonable time frame at the lowest cost, several trajectory options must be carefully considered. This thesis presents a comprehensive analysis of a trajectory consisting of a Jupiter Gravity Assist flyby to Pluto. JPL specified two nominal launch dates of November 2003 and December 2004. The daily C3 requirements for these dates were determined by using the JPL programs MIDAS and CATO. This facilitated the creation of nominal launch periods for these two dates. By comparing the launch energy required by the trajectory on each day of the period to the performance capabilities of several medium lift launch vehicles, launch strategies for each day were compiled. These results allow JPL to make the final decision of the most feasible arrangement for launch, and build an alternate launch plan should the primary become unavailable.
Originally posted by infamouskiller
Report Date:
1966
Media Count:
16 Pages(s)
Organization Type:
F - AIR FORCE
Report Number(s):
TC-1005 (TC1005)
TT66-61193 (TT6661193)
Monitor Acronym(s):
TT (TT)
Monitor Series:
66-61193 (6661193)
Descriptors:
*LUNAR BASES, *MOON, AUTOMATIC, ASTRONAUTICS, ASTRONOMY, USSR.ZLUNAR BASES, *MOON, AUTOMATIC, ASTRONAUTICS, ASTRONOMY, USSR.Z
Abstract:
The report gives a brief description of the instrumentation, launching, and soft landing of the Soviet Luna-9 moon station.
Originally posted by Tom Bedlam
I'm not so sure about the Easter bunny's effect on the speed of sound.
No, the temperature affects the density, so that's definitely a component of it, but pressure does not dictate temperature. It's an independent variable.
It's true that the gas law causes changes in pressure to affect temperature, especially if the volume is confined, but that change in temperature in real life generally radiates away in time. You can have a cylinder of gas at high pressure that's quite cold, for example. When we fill scuba tanks I do it in a water bath in order to absorb the heat, for example.
Gas composition also does not affect the heat. However, several characteristics of the gas change the velocity of sound through the gas. The main ones are the molecular weight of the gas, and the specific heat capacities of the gas at constant pressure and constant temperature.
Gas characteristic variations generally don't come into play in aeronautics but it does have an effect.
I'm not so sure about the Easter bunny's effect on the speed of sound.
Originally posted by carewemustA statement like "the speed of sound varies from
planet to planet" reads as if we've been to other planets and
ran sound tests. Interesting.