The tidal force of the Jupiter and Io with respect to that of the Earth and its Moon.

Answer to Problem 37QP
The tidal force experienced by the moon Io of Jupiter is 3.05×105 times stronger than the tidal force experienced by the Earth’s moon.
Explanation of Solution
The tidal force is the gravitational interaction felt by a celestial body towards and away from its centre of mass due to the presence of the other celestial body around it.
Write the expression for the tidal force acting on the moon.
Ftidal=2GMpMmRmd3p−m (I)
Here, Ftidal is the tidal force on moon, G is the gravitational constant, Mp is the mass of the planet, Mm is the mass of the moon, Rm is the radius of the moon and dp−m is the distance between the moon and the planet.
Write the expression for the comparison of the tidal force on Earth-moon and Jupiter-Io system.
Ftidal-IoFtidal-m=MJupMIoRIod3Jup−IoMEMmRmd3E−m (II)
Here, MJup is the mass of the planet Jupiter, MIo is the mass of the moon Io, RIo is the radius of the moon Io, dJup−Io is the distance between the moon Io and the planet Jupiter, ME is the mass of the planet Earth, Mm is the mass of the Earth’s moon, Rm is the radius of the Earth’s moon and dE−m is the distance between the Earth’s moon and the planet Earth.
The mass of the planet Jupiter is 1.898×1027 kg whereas the mass of its moon Io is 8.9×1022 kg.
The mass of the Earth is 6×1024 kg and the mass of the Earth’s moon is 7.34×1022 kg.
The radius of the Earth’s moon is 1737 km and the radius of Io is 1820 km.
The orbital radius of the Earth’s moon is 385,000 km and the orbital radius of Io is 422,000 km.
Conclusion:
Substitute 1.898×1027 kg for MJup, 8.9×1022 kg for MIo, 1820 km for RIo , 422,000 km for dJup−Io, 6×1024 kg for ME, 7.34×1022 kg for Mm, 1737 km for Rm and 385,000 km for dE−m in equation (II).
Ftidal-IoFtidal-m=(1.898×1027 kg)(8.9×1022 kg)(1820 km(1000 m1 km))(422,000 km(1000 m1 km))3(6×1024 kg)(7.34×1022 kg)(1737 km(1000 m1 km))(385,000 km(1000 m1 km))3=4.09×10301.34×1028=3.05×105
Thus, the tidal force experienced by the moon Io of Jupiter is 3.05×105 times stronger than the tidal force experienced by the Earth’s moon.
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