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lengan beban= lb= 30 cm
beban=w= Fb=450 N
kuasa=Fk=125 N
ditanya: total panjang lengan kuasa sampai beban...?
maka:
tentukan lengan kuasa.
W*lb= F*lk
lk= W*lb/F= 450 N *30 cm/125 N = 108 cm
panjang kuasa ke beban= lk+lb
= 30 cm + 108 cm = 138 cm
jawaban: B.