6 79 A spaceship nears the Moon along a parabolic trajectory that almost touches the...

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6 79 A spaceship nears the Moon along a parabolic trajectory that almost touches the Moon s surface In order to transfer An into a circular orbit a retro engine fires at the instant of the closest approach The engine ejects gas at a speed of u 4 km s relative to the spaceship in its direction of motion Ifv velocity of spaceship in parabolic trajectory when it almost touches the earth and v velocity of spaceship in circular orbit when it V 2 almost touches the earth Then what fraction of total mass should the fuel burn to transfer space ship to circular orbit 11 12 Ans M Moe T 3600 K 6 C

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