Posted: December 3rd, 2015

Special relativity

Special relativity

(a)  A rocket propels itself along a straight line in empty space by burning its

fuel in such a way that the velocity of the exhaust gases ejected from the nozzle

is v0 in the instantaneous (inertial) rest frame of the rocket. If the rocket

starts from rest with a total mass Mi (icluding fuel), find the relationship

between its velocity and mass during its journey.

(b)  Typical chemical fuels yield exhaust speeds of the order of 103 m/s. Let us

imagine we had a fuel that gives v0 = 3 × 105 m/s. What initial mass of fuel would

the rocket need in order to attain a final velocity of 0.1c for a final mass of 1

ton?

(c)  Matter-antimatter fuel yields v0 = c = 1 (the exhaust consists of photons).

What initial mass of fuel would be required in this case (in order to attain a

final velocity of 0.1c for a final mass of 1 ton)?

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