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posted by  abo ali on 11/7/2009 8:43:19 AM  |  status: Live  |  Earned Karma: 25

please help me

Course Textbook Chapter Problem Needs by
Calculus Based Physics Physics for Scientists and Engineers A Strategic Approach (2nd) by Knight 9 71CP 11/9/2009 at 12:00:00 PM
Question Details:
You are the ground-control commander of a 2000 {\rm kg}scientific rocket that is approaching Mars at a speed of 2.9×104 km/hr. It needs to quickly slow to2.0×104 km/hr to begin a controlled descent to the surface. If the rocket enters the Martian atmosphere too fast it will burn up, and if it enters too slowly, it will use up its maneuvering fuel before reaching the surface and will crash. The rocket has a new braking system: Several 5.0 {\rm kg} "bullets" on the front of the rocket can be fired straight ahead. Each has a high-explosive charge that fires it at a speed of 111,000 {\rm m/s} relative to the rocket.

You need to send the rocket an instruction to tell it how many bullets to fire. Success will bring you fame and glory, but failure of this $500,000,000 mission will ruin your career.
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