BOLA PEJAL
Ek = 1/2.m.v² + 1/2.I.ω²
Ek = 1/2.m.v² + 1/2. 2/5. m.R². v²/R²
Ek = 7/10. m.v²
Em di dasar = Em di atas bidang.
Ek = Ep
7/10. m.v² = m.g.h
v² = 10/7. g.h
400 = 10/7. 10. h
h = 4. 7 = 28 m
SILINDER PEJAL
Ek = 1/2.m.v² + 1/2. 1/2. m.R². v²/R²
Ek = 3/4. m.v²
3/4. m.v² = m.g.h
v² = 4/3. g.h
400 = 4/3. 10. h
h = 1200/40 = 30 m
Jawaban. C
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BOLA PEJAL
Ek = 1/2.m.v² + 1/2.I.ω²
Ek = 1/2.m.v² + 1/2. 2/5. m.R². v²/R²
Ek = 7/10. m.v²
Em di dasar = Em di atas bidang.
Ek = Ep
7/10. m.v² = m.g.h
v² = 10/7. g.h
400 = 10/7. 10. h
h = 4. 7 = 28 m
SILINDER PEJAL
Ek = 1/2.m.v² + 1/2.I.ω²
Ek = 1/2.m.v² + 1/2. 1/2. m.R². v²/R²
Ek = 3/4. m.v²
Em di dasar = Em di atas bidang.
Ek = Ep
3/4. m.v² = m.g.h
v² = 4/3. g.h
400 = 4/3. 10. h
h = 1200/40 = 30 m
Jawaban. C