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    Hi, I've attempted these questions but I'm not sure of my answers. Can someone attempt them please?

    a. I got 7.33 x 10^45
    b.2.08 x 10^-16
    c. I don't really know how to do this. Something to do with p=e/t
    d.I don't know this one either.
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    Well since the energy per ion is known and the power of the engine is known you can calculate the number of atoms being emitted per second - take care to convert units to SI where necessary.

    rocket engines work by reaction... conservation of momentum

    so for the same energy you could eject the same number of ions that had quarter the mass per ion at twice the velocity... but would that be beneficial in an impulse engine?

    more discussion on 'why xenon?'
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