Saturday, January 12, 2013

Contoh Soal Kekekalan Massa Energi Mekanik

Kerjakan soal berikut!

1. Sebuah benda yang bermassa 1 kg mula-mula berada pada ketinggian 10 m dari permukaan tanah. Benda kemudian dijatuhkan bebas dan pada suatu saat mempunyai ketinggian 2 m dari permukaan tanah. Percepatan gravitasi di permukaan bumi = 10 m/s^2. Hitunglah:
a. energi potensial benda mula-mula
b. usaha yang dilakukan oleh gaya berat benda selama perubahan tersebut!

2. Sebuah piring terbang dengan massa 5 kg sedang terbang mendatar pada ketinggian 10 meter di atas permukaan tanah dengan kecepatan tetap 50 m/s, jika g = 10 m/s^2, hitunglah:
a. energi potensial piring terbang
b. energi kinetik piring terbang
c. energi mekanik piring terbang!


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