p09 042

background image

42.

(a) We use Eq. 9-42. The thrust is

R v

rel

=

M a

=

4.0

× 10

4

kg

2.0 m/s

2

=

8.0

× 10

4

N .

(b) Since v

rel

= 3000 m/s, we see from part (a) that R

27 kg/s.


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