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8 Space physics

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Question 6

Table 1 shows data about four moons of a gas giant planet.

MoonMean distance from the planet (km\text{km}km)Time taken for one orbit (days\text{days}days)
Moon A120 000120\,0001200001.51.51.5
Moon B240 000240\,0002400004.24.24.2
Moon C360 000360\,0003600007.87.87.8
Moon D480 000480\,00048000012.012.012.0
a.

Describe the relationship between the mean distance from the planet and the time taken for one orbit.

[1]
b.

Calculate the orbital speed of Moon B in km/day\text{km/day}km/day. Use the equation:

orbital speed=2π×mean distancetime taken for one orbit \text{orbital speed} = \frac{2\pi \times \text{mean distance}}{\text{time taken for one orbit}} orbital speed=time taken for one orbit2π×mean distance​

Give your answer to 3 significant figures.

[3]
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8 Space physics Questions

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