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Rocket Propulsion in Gravitational Field - II01:03

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A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the...
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The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the...
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The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket...
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Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
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Projectile Motion01:20

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An object thrown in the air follows a parabolic path under the influence of Earth's gravitational force. The motion of such an object is called projectile motion, and the object itself a projectile. The parabolic path followed by the projectile is called the trajectory. Some common examples of projectile motion are the launching of fireworks, a golf ball in the air, meteors entering the Earth's atmosphere, and the firing of bullets.
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Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
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Automated Delivery of Microfabricated Targets for Intense Laser Irradiation Experiments
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Progress on the Starshot laser propulsion system.

S Pete Worden, Wesley A Green, James Schalkwyk

    Applied Optics
    |November 22, 2021
    PubMed
    Summary

    Breakthrough Starshot aims for interstellar probes using laser-powered sails. Researchers are addressing challenges for the 100 GW laser system, finding no fundamental barriers to this ambitious space exploration goal.

    Area of Science:

    • Aerospace Engineering
    • Applied Physics
    • Laser Technology

    Background:

    • The Breakthrough Starshot initiative proposes interstellar probes propelled by light sails.
    • These nanocraft spacecraft are designed to reach nearby stars within a human lifespan.
    • Propulsion relies on photon momentum transfer from a powerful ground-based laser.

    Purpose of the Study:

    • To identify and address key challenges in developing the laser system for Breakthrough Starshot.
    • To explore early efforts and potential solutions for overcoming these technological hurdles.
    • To assess the feasibility of the proposed laser technology for interstellar missions.

    Main Methods:

    • Analysis of requirements for a kilometer-scale, 100 GW coherent phased-array laser.

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  • Review of current laser technologies and potential advancements.
  • Exploration of engineering and physics challenges associated with high-power laser arrays.

    • Main Results:

    • Several major challenges for the Starshot laser system have been identified.
    • Early exploratory efforts suggest potential pathways to overcome these challenges.
    • No fundamental physical or economic restrictions were found that would prevent the laser's development.

    Conclusions:

    • The development of a 100 GW laser for Breakthrough Starshot faces significant but surmountable challenges.
    • Ongoing research and technological innovation are crucial for realizing this interstellar mission.
    • The proposed laser system remains a viable concept for enabling rapid interstellar travel.