4. Another planet has four times the Earth's mass and two times the Earth's radius. If an object weighs 100 N on this planet, then what will the object weigh on Earth? 5. A person weighs 400 N on the Earth. What will this person weigh on a planet that has four times the Earth's radius and eight times the Earth's mass? 6. The Moon orbits the Earth with a period of about 27.3 days. How long will it take a satellite to orbit the Earth if its distance from the Earth is half the Moon's distance from the Earth? 7. An object weights 1000 N on planet Alpha. Planet Alpha has 15 times the mass of planet Beta and 2 times the radius of planet Beta. What will the object weight on planet Beta?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!