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با سیه دل چه سود گفتن وعظ نرود میخ اهنی در سنگ شیخ اجل Of what use is preaching to a black heart? An iron nail cannot be driven into a rock. 'Sadi'

it is sattar 4

zolfaqar (zolfiqar) fast boat:

saye (shadow):

its suicide boat:

khalij fars:

banner title: shahed 285 combat helicopter, armed with sadid missile and 342 smart bomb

the power of khalij fars missile

suicide boat:

zelzal rocket:

shahed 129:

SU-50ES

Of course launcher is doing something a little different with your comment. In the energy analysis only considered the beginning and end of the process. Actually launcher increases kinetic energy of the satellite and has no relation to the potential energy. Potential energy varies depending on...

don't squabble please If we consider the center of gravity, center of the earth, then we calculate the mechanical energy of the Earth's surface; (1) since with increasing distance from the surface of the Earth, gravitational potential energy is reduced and linear velocity to stay in orbit...

thanx omidvaram to bahsha betoonam komak konam