Page 48 - UKBM Fisika 10 Genap 2122_Facile
P. 48

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                          Hukum II Kepler
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                          Hukum III Kepler     ................................................................................................................................
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                     Perhatikan bunyi Hukum Kepler di atas!
                     Bukankah bunyi hukum tersebut sama dengan apa yang Anda renungkan??
                     Ternyata Anda juga seorang ilmuwan….
                  Contoh

                       Berikut adalah contoh penerapan hukum III Kepler untuk menentukan periode revolusi
                  planet.

                       Perbandingan antara jarak planet A dan jarak planet B terhadap bintangnya adalah 1 : 4.
                  Apabila planet A mengelilingi bintang tersebut dalam 100 hari, berapakah periode planet B
                  mengelilingi bintang tersebut?

               Penyelesaian:
               Diketahui      : perbandingan jari-jari planet A dan B
                              RA : RB = 1 : 4
                              TA = 100 hari
               Ditanyakan     : TB ?
               Jawab          :
                                                          2        3
                                                                           
                                                     �   � = �    �
                                                                   
                                                                    

                                                  3             3
                                                              4
                                                                       2
                                                       2
                                           = ��  � (     ) =  � � � (100) = 800 ℎ            
                                                         
                                           
                                                              1

                       Jadi, periode planet B mengelilingi bintang tersebut selama 800 hari.






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