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42) Newton’s law of gravity is F = G m1 m2 / d2. Can this be…

42) Newton’s law of gravity is F = G m1 m2 / d2. Can this be used to find the force of gravity between the Sun and a planet? If so, what is d?

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4) Newton’s second law of motion states that

4) Newton’s second law of motion states that

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30) Which of the following statements does not use the term…

30) Which of the following statements does not use the term light-year in an appropriate way?

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14) What is the primary reason for making reflecting telesco…

14) What is the primary reason for making reflecting telescopes larger?

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13) New technologies will soon allow astronomers to use X-ra…

13) New technologies will soon allow astronomers to use X-ray telescopes on Earth’s surface.

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31) What do we mean by the observable Universe?

31) What do we mean by the observable Universe?

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38) During the year, the Sun appears in front of different g…

38) During the year, the Sun appears in front of different groups of stars. What are these called?

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16) A star near the north celestial pole, observed from the…

16) A star near the north celestial pole, observed from the northern hemisphere

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15) How did Eratosthenes estimate the size of Earth around 2…

15) How did Eratosthenes estimate the size of Earth around 240 B.C.?

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2) How do electrons inside an atom change energy?

2) How do electrons inside an atom change energy?

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