Wednesday, January 23, 2013

Contoh Soal Fluida Diam

1. Sebuah bejana berbentuk kubus dengan panjang rusuk 10 cm diisi dengan air sebanyak 0,8 liter. Jika massa jenis air 1 gr/cm^3, hitunglah:
a. tekanan hidrostatis pada titik kedalaman 6 cm dari permukaan air
b. tekanan hidrostatis pada dasar bejana
c. gaya hidrostatis pada dasar bejana!

2. Sebuah dongkrak hidrolik digunakan untuk mengangkat salah satu sisi bagian mobil seberat 200 N pada bagian penampang yang besar. Untuk mengangkat bagian mobil tersebut diberikan gaya sebesar 4 N pada pengisap kecil. Berapakah perbandingan jari-jari pengisap kecil dan pengisap besar?

3. Sebuah benda bila berada di udara beratnya 10 N, bila dimasukkan ke dalam air beratnya seolah-olah menjadi 4 N dan bila dimasukkan ke dalam zat cair lainnya beratnya seolah-olah menjadi 2 N. Jika massa jenis air = 1 gr/cm^3, berapakah massa jenis zat tersebut?

4. Sebuah benda dengan massa 200 gram terapung di air yang massa jenisnya 1 gr/cm^3. Jika 0,6 bagian benda tersebut terbenam dalam air, hitunglah:
a. volum benda
b. volum seluruh benda
c. gaya ke atas yang dialami benda!

5. Sebuah balon udara dengan menggunakan gas helium dirancang untuk  mampu membawa beban 1000 kg, termasuk massa balon beserta alat-alatnya. Berapakah seharusnya volum minimum balon jika massa jenis udara 1,3 kg/m^3 dan massa jenis helium 0,2 kg/m^3?


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