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**Unformatted text preview: **rockets are fired against the direction of motion. b) The time will be half the period as given in Eq. (12.19), with the semimajor axis a being the average of the orbit radii, m, 10 89 . 1 11 = a so s, 10 24 . 2 kg) 10 99 . 1 )( kg m N 10 673 . 6 ( ) m 10 (1.89 2 7 30 2 2 11 2 3 11 = = =-T t which is more than 2 1 8 months. c) During this time, Mars will pass through an angle of = 9 . 135 ) 360 ( ) d s 400 , 86 )( d 687 ( ) s 10 24 . 2 ( 7 , and the spacecraft passes through an angle of 180 , so the angle between the earth-sun line and the Mars-sun line must be 1 . 44 ....

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