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                                    If the time period of revolution of a planet is increased to 3from what percentage its radius of the or6.resent value. Thento 3/3 times its pbit of revolution will increases? | 
                            
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Answer»  as we know the third kepler’s law of planetry motion that is T²=k R³ so according to that T²= K *R² => T²/R³ = k .........(1)now new T = 3√3T {3√3T}²/R'³= k.........(2) so, equating both R'³ = R³*(3√3T)²/T² => R'³ = 27R³=> R' = 3R so, R should be increased by (3R-R)*100/R = 200%  | 
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