Let us introduce

If we multiply Eq. 4.20.20 on p dp and then integrate it, we obtain instead of Eq. 4.20.20

where (p) = JpNp2dp . From Eq. 4.20.22 follows that d(p)/dt ={p)/rac, or (p) = p0exp((/Tac), (4.20.23)

and Tac determined by Eq. 4.20.21 have a meaning of effective acceleration time.

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