Physics Help Forum The increase in speed and increasing the acceleration of reactor power of the spacecr

 Special and General Relativity Special and General Relativity Physics Help Forum

 Jul 13th 2009, 04:06 AM #1 Junior Member   Join Date: Jul 2009 Posts: 2 The increase in speed and increasing the acceleration of reactor power of the spacecr To download Author : Mohammadreza Tabatabaei Source : http://ki2100.com/english/index.php?option=com_content&view=article&id=47:th e-increase-in-speed-and-increasing-the-acceleration-of-reactor-power-of-the-spacecraft-is&catid=35:relativity&Itemid=54
 Jul 13th 2009, 04:38 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Thanks for the link. But can you use the eqns of special relativity along with acceleration?
 Jul 15th 2009, 05:47 AM #3 Physics Team   Join Date: Apr 2009 Location: Boston's North Shore Posts: 1,576 That paper has an error in it. The expression F = ma is incorrect if the force is in the same direction the body is moving. E.g. if you have a body moving in the +x direction then $\displaystyle F_x = \gamma^3m_0a_x$ The derivation of this expression is here Longitudinal and Transverse Mass What you have in your paper is $\displaystyle F_x = \gamma m_0a_x$ which is wrong. I can read more if you'd like but what you've been trying to calculate has already been rigorously been done. See http://en.wikipedia.org/wiki/Relativistic_rocket Even if a rocket has constant acceleration in its own frame of reference it will never reach the speed of light. That calculation is also well known. See http://www.geocities.com/physics_wor...form_accel.htm Uniform acceleration occurs when a charged particle is placed in a uniform electric field. In the particle's rest frame the force is a constant so the acceleration is uniform. Such a particle can never reach the speed of light. Last edited by Pmb; Jul 15th 2009 at 06:06 AM.

 Tags acceleration, increase, increasing, power, reactor, spacecr, speed

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