Physics question on radius of planets

Physics
Tutor: None Selected Time limit: 1 Day

The mean radius of a planet is 6.91 × 106 m, and that of its moon is1.42×108 cm.

From this data calculate the ratio of the planet’s surface area to that of its moon. 

Aug 18th, 2015

Thank you for the opportunity to help you with your question!

Surface area of a sphere like the planet and the moon is given by 4πr2. 


So here the ratio will be 4π(6. 91× 106) × (6.91×106)m2 : 4π(0.0142× 1.08) × (0.0142× 1.08)m2

Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 18th, 2015

So on further breakdown will give you 534945.96 : 0.015336 


= 34881713

Aug 18th, 2015

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