Multiple Choice
When do the greatest tidal ranges occur according to Newton's Law of Gravity?
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8. Centripetal Forces & Gravitation
Newton's Law of Gravity
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According to Newton's Law of Gravity, what primarily causes the different seasons on Earth?
A
The tilt of the Earth's axis relative to its orbit around the Sun.
B
The gravitational pull of the Moon on the Earth's oceans.
C
The changes in the Sun's gravitational force throughout the year.
D
The varying distance between the Earth and the Sun during the year.
Verified step by step guidance1
Understand that Newton's Law of Gravity describes the gravitational attraction between two masses, such as the Earth and the Sun, but it does not directly explain the cause of seasons.
Recognize that the primary cause of the different seasons on Earth is the tilt of the Earth's axis relative to its orbit around the Sun, not gravitational forces.
The Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbital plane. This tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year.
During different times of the year, either the Northern or Southern Hemisphere is tilted towards the Sun, resulting in longer days and more direct sunlight, which causes summer in that hemisphere.
Conversely, when a hemisphere is tilted away from the Sun, it experiences shorter days and less direct sunlight, leading to winter. This axial tilt, rather than gravitational changes, is the primary reason for seasonal variations.
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