Go Back   Physics Help Forum > College/University Physics Help > Special and General Relativity

Special and General Relativity Special and General Relativity Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old 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
saman_1810 is offline   Reply With Quote
Old 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?
physicsquest is offline   Reply With Quote
Old Jul 15th 2009, 05:47 AM   #3
Pmb
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.
Pmb is offline   Reply With Quote
Reply

  Physics Help Forum > College/University Physics Help > Special and General Relativity

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



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Electromagnet actuator increase power project Electricity and Magnetism 1 May 2nd 2016 08:11 AM
Linear Speed? Angular Speed? Centripetal Acceleration? sadistprincess Periodic and Circular Motion 1 Oct 3rd 2013 06:02 AM
Nuclear reactor jaiii Nuclear and Particle Physics 2 Apr 20th 2012 02:38 PM
power, mass, speed, time and height furor celtica Kinematics and Dynamics 2 Aug 30th 2011 12:32 AM
constant power in car, but where is the acceleration? jest1989 Energy and Work 0 Nov 22nd 2009 06:08 PM


Facebook Twitter Google+ RSS Feed