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Thomson's e/m Experiment

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In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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Rocket Propulsion In Empty Space - II

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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 experiences by...

Rocket Propulsion in Empty Space - I

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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 rocket's...

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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.
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Impact: Problem Solving

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
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Rocket Propulsion in Gravitational Field - I

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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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Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform

Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform

Published on: January 13, 2019

Results from recent spaceflight experiments (1).

¹Department of Physiology and Anatomy, German Sport University Cologne, Germany. u.hoffmann@dshs-koeln.de

Respiratory Physiology & Neurobiology

|May 16, 2009

Summary

This summary is machine-generated.

Research on cardiovascular regulation has explored weightlessness effects since Sputnik 2 in 1957. This summary outlines the evolution of this physiological research, focusing on spaceflight impacts.

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Area of Science:

Physiology
Space Medicine
Cardiovascular Research

Background:

Since 1957, the physiological effects of weightlessness on cardiovascular regulation have been a key research area.
Early research was spurred by the Sputnik 2 mission, highlighting the need to understand spaceflight impacts.

Purpose of the Study:

To provide a concise overview of the historical development of cardiovascular research concerning weightlessness.
To summarize key findings and research trajectories presented in the first part of the workshop.

Main Methods:

Literature review of historical research on cardiovascular regulation and weightlessness.
Synthesis of contributions from a workshop focused on spaceflight physiology.

Main Results:

The field has evolved significantly since the initial investigations in the late 1950s.
Research has progressively deepened the understanding of cardiovascular adaptation to microgravity.

Conclusions:

Cardiovascular regulation under weightlessness remains a critical area of physiological study.
Continued research is essential for astronaut health and future space exploration.