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GETARAN , GELOMBANG DAN BUNYI

GETARAN , GELOMBANG DAN BUNYI. SM K Kelas X I Semester 2. Standar Kompetensi. Kompetensi Dasar. 1.2 Menguasai konsep getaran , hukum gelombang , hukum bunyi 1.3 Membedakan getaran , gelombang , dan bunyi 1.4 Menghitung getaran , gelombang dan bunyi.

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GETARAN , GELOMBANG DAN BUNYI

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  1. GETARAN , GELOMBANG DAN BUNYI SMK Kelas XI Semester 2

  2. Standar Kompetensi Kompetensi Dasar 1.2 Menguasaikonsepgetaran, hukumgelombang, hukumbunyi 1.3 Membedakangetaran, gelombang, danbunyi 1.4 Menghitunggetaran, gelombangdanbunyi 1. Menerapkangetaran, gelombang, danbunyi

  3. Indikator Dapatmenggunakanrumus-rumusgetaranuntukmenyelesaikanpermasalahan Dapatmenggunakanrumus-rumusgelombanguntukmenyelesaikanpermasalahan Dapatmenggunakanrumus-rumusbunyiuntukmenyelesaikanpermasalahan

  4. getaranbolak-baliksuatubendasecaraperiodikmelaluititiksetimbangnyagetaranbolak-baliksuatubendasecaraperiodikmelaluititiksetimbangnya GETARAN Contohgetaran :gerakbandul jam, gerakpegas, geraktorakmesindan lain-lain

  5. Titikkeseimbangan = O A O B Satuperiode / satugetaran = A – O – B – O – A Dimana : T = Periode (s) t = waktu (s) n = jumlahgetaran f = frekuensi (Hz)

  6. GETARAN PEGAS AYUNAN MATEMATIS m : massabeban (kg) k : konstantapegas (N/m) l = panjangtali (m) g = percepatangravitasibumi (m/s²)

  7. SIMPANGAN • Jarakkedudukanbendaterhadaptitiksetimbang • Hargakesetimbangansetiapsaatberubah-ubah. • Y = A sin ω.t or • Y max = A ω = 2πf Dimana : Y = simpangan (m) A = amplitudo (m) ω = kecepatansudut (rad/s)

  8. Rumus-rumusgetaran • Kecepatangetaran (V) (m/s) V = ω. A cosω.t atau V max = ω. A hubungan Y dan V: • Percepatangetaran (a) (m/s²) a = - ω². Y atau a max = -ω². A • Gaya getaran (F) (N) F = m. a • Energigetaran (Ep, Ek, Em) (j)

  9. Energigetaran • Energipotensial (Ep) Ep = ½.m.ω².Y² • Energikinetik (Ek) Ek = ½.m.v² atauEk = ½.m.ω².(A²-Y²) • Energimekanik (Em) Em = Ep+Ek Em = ½.m.ω².A²

  10. Sudutfase (θ) θ = ω.t • Fase (Ф) • Beda fase (∆Ф)

  11. LATIHAN SOAL • Ayunanbandul jam adalahsatu kali tiapdetik. Bila g = 9,8 m/s², makapanjanglengannya . . . • Diket : T = 1 s g = 9,8 m/s² • Dijawab : Ditanya : L .....?

  12. Suatubendamassanya 0,2 kg melakukangerakharmonisdengan amplitude 0,5 m danfrekuensi 4 Hz. Besarenergikinetikpadasaatsimpangannyasetengahamplitodanyaadalah ....(π²=10) Diket : m = 0,2 kg A = 0,5 m f = 4 Hz Y = ½.A Ditanya : Ek .......? Dijawab : Ek = ½.m.v² = ½.m.ω².(A²-Y²) = ½.m.(2πf)².(A²-Y²) = ½.m.4π²f².(A²-Y²) = ½.0.2.4.10.4²(A²-1/4A²) = 48(3/4.A²) = 48(3/4.1/4) = 48(1/4) = 12 j

  13. Kerjakansoal • Hal 46 nmr 4 • Hal 46 nmr 7 • Hal 47 nmr 3 • Hal 47 nmr4 Remidi TUGAS BAB GETARAN: hal 46 nmr 5, hal 47 nmr 13, hal 47 nmr 1 dan 5

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