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P-Q-R-Q-P= 1 getaran, P-Q-R-Q-P= 1 getaran, P-Q-R= 1/2getaran
F= n/t = 2,5/ 2= 1,25Hz
A1 = 25 cm2
A2 = 240 cm2
dit = F1?
JWB = F1 = A1/A2 × F2
= 25×3600/240
= 375 N (D)