8. Centripetal Forces & Gravitation

Newton's Law of Gravity

Multiple Choice
According to Newton's Law of Gravity, what is the magnitude of the net gravitational force exerted on the Sun by a planet of mass m orbiting at a distance r with gravitational constant G?
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Multiple Choice
Gravitational Force: At what point is a spaceship traveling to the Moon beyond the pull of Earth's gravity?
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Multiple Choice
How many kilometers above the Earth's surface must you travel for your weight to decrease to 49% of its value at the surface, according to Newton's Law of Gravity?
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Multiple Choice
The acceleration due to gravity on the Moon's surface is about one-sixth that on Earth. Given that the radius of the Moon is roughly one-quarter that of the Earth, what is the mass of the Moon in terms of the mass of the Earth?
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Multiple Choice
The mass of the moon is 7.36 × 10^22 kg and its distance to the Earth is 3.84 × 10^8 m. What is the gravitational force of the moon on the Earth, given that the gravitational constant G is 6.674 × 10^-11 N(m/kg)^2?
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Multiple Choice
The mass of the sun is 1.99×10^30 kg and its distance to the Earth is 1.50×10^11 m. What is the gravitational force of the sun on the Earth, given that the mass of the Earth is 5.97×10^24 kg and the gravitational constant G is 6.674×10^-11 N(m/kg)^2?
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Multiple Choice
According to Newton's Law of Gravity, if the gravitational force exerted by the Sun on the Earth is 100%, what percentage of this force is exerted by the Moon on the Earth?
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Multiple Choice
What is the ratio of the Sun's gravitational force on the Moon to the Earth's gravitational force on the Moon?
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Textbook Question
Binary star: Two equal-mass stars maintain a constant distance D apart (Fig. 6–34) of 8.0 x 10¹¹ m and revolve about a point midway between them at a rate of one revolution every 14.2 yr. Why don’t the two stars crash into one another due to the gravitational force between them?
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