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1a.: Re: (unknown) From: haryo_hep

2a.: Jawaban pertanyaan: Mengapa sisi bulan yang menghadap ke bumi selalu From: haryo_hep

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1a.: Re: (unknown)

Posted by: "haryo_hep" sumowidagdo@gmail.com haryo_hep

Fri Aug 21, 2009 2:14 pm (PDT)

Dari Wikipedia entry tentang Moon (Bulan):

"The Moon is in synchronous rotation, which means it rotates about its axis in about the same time it takes to orbit the Earth. This results in it keeping nearly the same face turned towards the Earth at all times. The Moon used to rotate at a faster rate, but early in its history, its rotation slowed and became locked in this orientation as a result of frictional effects associated with tidal deformations caused by the Earth.[11]"

Beberapa artikel lain yang mendiskusikan fenomena ini.

http://en.wikipedia.org/wiki/Synchronous_rotation
http://en.wikipedia.org/wiki/Tidal_locking

Haryo

--- In fisika_indonesia@yahoogroups.com, fardhady himawan <fardhady14789@...> wrote:
>
> Wah kalo itu saya tdk trlalu tau alasan gamblangny, shg blum bisa
> jelasin mengapa demikian
> Kalo "kebetulan" spertiny tidak, mungkn ada faktor dimensi bulan, bumi
> dan matahari
>
> Ada yg tau lbh detail?
>
> On 8/18/09, Kriss Kross <ondo_kiss@...> wrote:
> > mengapa bisa sama?apakah "kebetulan"?
> >
> > salam,
> >
> > ondo
> >
> > Posted by: "fardhady himawan"
> > fardhady14789@...
> >
> >
> > Mon Aug 17, 2009 5:55 am (PDT)
> >
> >
> >
> >
> >
> > Waalaykumussalam
> >
> >
> >
> > Karena periode rotasi thd poros sama dgn periode revolusi thd bumi.
> >
> > Itu yg menyebabkan muka bulan slalu trlihat sama.
> >
> >
> >
> > On 8/17/09, Setiyono Nedi <nekdiel@yahoo. co.id> wrote:
> >
> >> aslmuala'km. maaf mau tanya mengapa muka bulan setiap hari selalu tampak
> >
> >> sama?thanks
> >
> >>
> >
> >>
> >
> >>
> >
> >
> >
>

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2a.: Jawaban pertanyaan: Mengapa sisi bulan yang menghadap ke bumi selalu

Posted by: "haryo_hep" sumowidagdo@gmail.com haryo_hep

Sat Aug 22, 2009 12:50 am (PDT)

Subject-nya ditulis supaya yang memulai thread ini melihat jawabannya.
Intinya lebih kurang interaksi gravitasi kedua benda akan mengubah periode rotasi masing-masing benda hingga keadaan setimbang terakhir adalah jika salah satu benda (terutama yang lebih kecil) memiliki periode rotasi yang sama dengan periode revolusi. Fenomena ini sudah diketahui sejak lama dalam bidang astronomi tata surya. Baca literatur tentang mekanika klasik atau mekanika benda langit.

Dari Wikipedia entry tentang Moon (Bulan):

"The Moon is in synchronous rotation, which means it rotates about its axis in about the same time it takes to orbit the Earth. This results in it keeping nearly the same face turned towards the Earth at all times. The Moon used to rotate at a faster rate, but early in its history, its rotation slowed and became locked in this orientation as a result of frictional effects associated with tidal deformations caused by the Earth.[11]"

Beberapa artikel lain yang mendiskusikan fenomena ini.

http://en.wikipedia.org/wiki/Synchronous_rotation
http://en.wikipedia.org/wiki/Tidal_locking

Haryo

--- In fisika_indonesia@yahoogroups.com, Setiyono Nedi <nekdiel@...> wrote:
>
> aslmuala'km. maaf mau tanya mengapa muka bulan setiap hari selalu tampak sama?thanks
>
>
> __________________________________________________________
> Nama baru untuk Anda!
> Dapatkan nama yang selalu Anda inginkan di domain baru @ymail dan @rocketmail.
> Cepat sebelum diambil orang lain!
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>

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