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Q. What are the two main mechanisms that the planet Earth uses to balance water that goes up with the water that comes down over Earth?

Q. A rocket of total mass 3700 kg is travelling in outer space with a velocity of 110 m/s toward the Sun. It wishes to alter its course by 35.0 degrees, and can do this by firing its rockets briefly in a direction perpendicular to its original motion. If the rocket gases are expelled at a speed of 1900 m/s, how much mass must be expelled?

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