13.1b Ex2 MJ17 P41 Q1 Earth Density | A2 Gravitational Fields | Cambridge A Level Physics

Example 2 - 9702/41/M/J/17: (a) Explain how a satellite may be in a circular orbit around a planet. #9702s17p41 #A2gForceP4 #Lv2 #A2horizontalCircleP4

(b) The Earth and the Moon may be considered to be uniform spheres that are isolated in space. The Earth has radius R and mean density ρ. The Moon, mass m, is in a circular orbit about the Earth with radius nR, as illustrated in Fig. 1.1. The Moon makes one complete orbit of the Earth in time T. Show that the mean density ρ of the Earth is given by the expression

(c) The radius R of the Earth is 6.38 × 10^3 km and the distance between the centre of the Earth and the centre of the Moon is 3.84 × 105 km. The period T of the orbit of the Moon about the Earth is 27.3 days. Use the expression in (b) to calculate ρ.

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[trash]

you made it so easy! thank you so so much <3

[ZeruiZhang-tp]

Thank you a lot!! This helped me a lot!

[alkadas]

would we get the same final answer if we converted the km in the nR/R ratio to m and then use that m value to find density?

[afifrazam]

lool cie copy paste this qs to new specimen paper 2022 xD