propulsion

Examples of propulsion in the following topics:

• Rocket Propulsion, Changing Mass, and Momentum

  • In rocket propulsion, matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
  • The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses is explained by the same physical principle: Newton's third law of motion.
  • The practical limit for ve is about 2.5×103m/s for conventional (non-nuclear) hot-gas propulsion systems.

• Escape Speed

  • Imagine a situation in which a spaceship that does not have a propulsion system is launched straight away from a planet.
  • (It is moot to discuss escape speed for objects with propulsion systems.)
  • If the vehicle has a propulsion system to provide it with energy once it has left the surface of the planet, it is not necessary to initially meet escape speed requirements.

• Orbital Maneuvers

  • An orbital maneuver is the use of propulsion systems to change the orbit of a spacecraft (the rest of the flight is called "coasting").
  • In spaceflight, an orbital maneuver is the use of propulsion systems to change the orbit of a spacecraft.

• Sperm

  • Motile sperm cells typically move via flagella and require a water medium in order to swim toward the egg for fertilization.These cells cannot swim backwards due to the nature of their propulsion.

• Phylum Chordata

  • In chordates, the tail has skeletal elements and musculature, and can provide most of the propulsion in aquatic species.

• Free-Falling Objects

  • The free fall would end once the propulsion devices turned on.

• Classification of Phylum Mollusca

  • Locomotion in cephalopods is facilitated by ejecting a stream of water for propulsion ("jet" propulsion) .

• The Effects of the Cold War

  • Not only must nuclear weapons and their delivery systems be secured and protected, other nuclear facilities and devices, such as reactors and propulsion systems, must be safeguarded.

• Lymphatic Vessel Structure