Answer to Question #172498 in Physics for Diocos

Question #172498

Two flywheels of negligible mass and different radii are bonded together and rotate about a common axis (see below). The smaller flywheel of radius 40 cm has a cord that has a pulling force of 60 N on it. What pulling force needs to be applied to the cord connecting the larger flywheel of radius 60 cm such that the combination does not rotate?

Expert's answer

"F_1r_1=F_2r_2\\\\(40)(60)=F_2(60)\\\\F_2=40\\ N"

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