The graph shows how the gravitational potential varies with distance between two planets, K and L, that have the same radius - AQA - A-Level Physics - Question 14 - 2018 - Paper 2
Question 14
The graph shows how the gravitational potential varies with distance between two planets, K and L, that have the same radius.
Which statement is correct?
A
B
C
D
Worked Solution & Example Answer:The graph shows how the gravitational potential varies with distance between two planets, K and L, that have the same radius - AQA - A-Level Physics - Question 14 - 2018 - Paper 2
Step 1
A. The mass of L is greater than the mass of K.
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Answer
This statement cannot be determined directly from the graph. The gravitational potential does not provide direct information about the masses of the planets without additional context.
Step 2
B. The gravitational field strength at the surface of L is greater than that at the surface of K.
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Answer
This statement is incorrect; the gravitational field strength is related to the slope of the gravitational potential graph. If the potential decreases at a greater rate near planet L, then its gravitational field strength is higher.
Step 3
C. The escape velocity from planet L is greater than from planet K.
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Answer
This statement may not be true, as escape velocity depends on both the mass and radius of a planet. Without knowing the mass or potential at the surfaces, this cannot be confirmed.
Step 4
D. More work must be done to move a mass of 1 kg from the surface of K to a distant point, than 1 kg from the surface of L.
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Answer
This statement is likely true if the gravitational potential is lower at the surface of L compared to K, indicating that more energy is required to overcome the gravitational field of K.
