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Practice Quiz 6
Physics 7B
Winter 2010
Feb. 17, 2010
A spaceship of 100,000 kg is approaching an alien planet (mass 1x10
25
kg, radius 7x10
6
m) with
a velocity of 12,000 m/s. The captain would like to establish a parking orbit 100 km above the
surface of the planet.
a) What will be the gravitational force on the spaceship when it is in its parking orbit?
b) The centripetal force is
mv
2
/
r
. In order for the parking orbit to be stable spaceship must be
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Unformatted text preview: traveling with the correct velocity. What is the required velocity for this orbit? (The gravitational force must equal the centripetal force) c) In order to slow down, the rocket ejects a propellant with a velocity of 20,000 m/s relative to itself. The rocket engine can burn propellant at a rate of 1000 kg/s. For how long must the captain fire the rocket motors to slow his ship down enough to enter the parking orbit?...
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This note was uploaded on 09/08/2010 for the course PHY 7B PHY7B taught by Professor Cebra during the Winter '10 term at UC Davis.
 Winter '10
 Cebra

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